KR100664773B1 - Body tissue-contacting topsheets, absorbent devices and tampons having the same - Google Patents

Abstract

The present invention relates to an improved body contact surface or topsheet for an absorbent device that is in contact with the wearer's functional body tissue. Such functional body tissues may include, but are not limited to, functional tissues such as interlabial skin or tissues, and mucosal tissues such as vaginal tissues. In one non-limiting embodiment, the topsheet comprises a suitable hydrophilic and substantially hydrophobic nonabsorbent nonwoven web. The topsheet is placed on absorbent devices such as sanitary napkins, tampons, pantyliners, interlabial devices, incontinence devices, bandages and other products. The present invention relates to a method of capturing excrement from an excretory source on a wearer's body, wherein at least a portion of the excretory source is located in a functional membrane having an irregular surface (eg, interlabial or intervaginal space of a female wearer). . The invention also relates to an absorbent article insertable into the interlabial space of a female wearer comprising an absorbent storage core and a body-contact vaginal excretion receiving layer overlapping the storage core. The absorbent storage core and the body-contact vaginal excretion receiving layer are arranged to communicate by needle punching. The absorbent storage core also includes an integral web of fibrous material, and optionally includes an absorbent gelling material and multiple penetrations. The absorbent article furthermore has an insertion means, which can be an installer or a collapsible reinforcement tab having a folding line integral with the article.

Description

Body Tissue-Contact Top Sheet, Absorbent Device and Tampon With Them

The present invention relates to an improved body contact surface or topsheet for absorbent articles, bandages or other devices, and more particularly to a comfortable topsheet when placed in contact with hydrous body tissues. The present invention also relates to absorbent devices such as sanitary napkins, tampons, pantyliners, interlabial devices, incontinence devices and bandages having such topsheets. Improved absorbent structures for absorbent articles are also disclosed. Moreover, the present invention provides a wearer's body image wherein at least a portion of the excretory source is located in a functional membrane having an irregular surface (eg, an interlabial or intervaginal space of a female wearer). To capture the feces from the excreta source.

Various absorbent products are well known in all manners configured to absorb body fluids such as menstrual blood, urine and feces. For women's protective devices, two basic types are provided in this area, one of which is a sanitary napkin developed to be worn externally around the vulva area, and the other is a vaginal blood flow to block the flow of menstrual blood from the vaginal cavity. Tampons developed to be worn inside the cavity. Such tampon devices are issued to Weigner et al. On Nov. 1, 1983, and US Pat. No. 4,412,833, entitled “Tampon Applicator,” and Jacobs, Nov. 8, 1983. US Pat. No. 4,413,986, entitled "Tampon Assembly With Means For Sterile Insertion," which is incorporated herein by reference.

In addition, hybrid devices have been proposed that attempt to combine the structural features of sanitary napkins and tampons into a single device. This hybrid device was issued to Aaron on September 7, 1937, and was assigned US Pat. No. 2,092,346, entitled "Catamenial Pad," and Denkinger, September 16, 1975. US Pat. No. 3,905,372, entitled Feminine Hygiene Protective Shield. Other hybrid devices that are less invasive are known as labia sanitary napkins or interlabial sanitary napkins, which are characterized by having at least partly present in the wearer's vestibule and at least partly outside the wearer's vestibule. I am doing it. Such devices are described in US Pat. No. 2,662,527, entitled "Sanitary Pad", issued December 15, 1953, to Lassen et al., Dec. 23, 1986. And US Pat. No. 4,631,062, entitled "Labial Sanitary Pad," to Larsen et al., Dated June 16, 1987, and entitled "Method for Improving the Arrangement of Menstrual Devices; Pads (Method and Pad Allowing Improved Placement of Catamenial Devices) "US Pat. No. 4,673,403.

The interlabial pad has the potential to provide much greater freedom from discomfort because of its small size and low risk of leakage. Many efforts have been made in the past to make absorbent devices that take full advantage of tampons and sanitary napkins while eliminating at least some of the disadvantages associated with each of these types of devices. Examples of such devices include U.S. Patent No. 2,917,049 to Delaney on December 15, 1959, U.S. Patent No. 3,420,235 to Harmon on January 7, 1969, and 1986. U.S. Patent No. 4,595,392 to Johnson et al. On June 17, 1, and U.S. Patent No. 5,484,429 to Vukos et al. On January 16, 1996. Commercially available interlabial devices are commercially available from A-Fem, Portland, Oregon, USA, and issued to Herschman on October 5, 1976 and November 27, 1979, respectively. There is an INSYNC small interlabial pattern described in US Pat. Nos. 3,983,873 and 4,175,561.

However, most of these devices have not had great commercial success. There are drawbacks associated with all these products. For example, the device disclosed in Delaney's patent is not considered easy and comfortable to insert because of the possibility of opening of the layer of absorbent material during insertion. The commercially available "IN-SYNC" interlabial device has the disadvantage that it may be easy to allow bypass outflow around its edges. These spills can cause body contamination or panty contamination that many consumers cannot accept.

The improved interlabial device is disclosed in U.S. Patent 5,762,644, U.S. Patent 5,885,265, U.S. Patent 5,891,126, U.S. Patent 5,895,381, U.S. Patent No. 5,916,205, US Pat. No. 5,928,452, US Pat. No. 5,951,537, US Pat. No. 5,968,026, US Pat. No. 6,033,391 and US Pat. No. 6,045,544. However, research on improving the interlabial device continues. In particular, there is a need for improvements to more comfortable topsheets for such devices that contact the wearer's inner labia and vaginal vault.

There are some expectations for the interlabial product. First, products worn primarily between the labia are required to remain in place without the usual panty attachment method (ie, adhesive). In order to keep these products positioned in the labia, they are compliant with labial origin, physical conformation such as structural compliance (i.e. fitting) and friction (i.e. sliding control) or adhesion due to capillary suction. It is necessary to keep a fixed state through the combination of. Second, the interlabial device, due to its limited size (size that can be accommodated within the labia), risks of panty contamination that occurs when body dung can move freely around the labia and come into contact with the wearer's underwear. It is required to collect body excreta from body excreta to minimize this. Contrary to expectations, it is not straightforward to provide good performance against contamination through better treatment of body excretion for products worn between the labia. Products mainly worn in the labia are closer to the excretory, but are more complex to process body waste than tampons worn outside or tampons worn inside.

This complexity stems from the anatomical complexity of the labia arrhythmias and the unique interaction of body excretion with the labia surface. First of all, the anatomical structure of the labia majora is complex, and not per woman or race. For example, the dimensions of the labia primary tend to be smallest in Asian size, white in middle, and African in size. Each group has a wide range of shapes, sizes and depths. Since the labia origin is not constant, it is very complicated to assume that the worn interlabial pads must physically contact and absorb body waste when the body waste is in the vaginal opening. In addition, the ability to design a single product to actually fit may be problematic because of the very large structural differences between women.

Although a limited number of product designs can be made to fit the shape and size of a large number of unique labia, these products must provide uniform contact to all surfaces within the labia invasion which may be covered by the conveying body waste.

In order to solve this problem, the product should have both "macroscopic adaptability" and "microscopic adaptability" components. "Macroscopic suitability" is the overall fit of the product into the labial opening. "Microscopic suitability" is the fitting of the interlabial device into a textured labia surface to extract body feces from within this textured surface.

Also, anatomically speaking, the physical structure of the skin in the labia, in particular labia minora, as compared to adjacent skin surfaces, such as in the perineal groove, buttock, and medial thigh regions, which are normally contacted by a sanitary napkin; There is a marked difference in both properties. It is important to note that there is a difference between the outer surface (buttocks, perineal grooves, outward labia major surfaces, etc.) and the inner surface (the labia minora, vulva vault and vagina). The stratum corneum begins to change as it progresses toward the vulva from the "outer" body surface of the buttock or medial thigh, representing the normal stratum cornea. The external vulva (outward facing surface) is rather thick and still exhibits a stratum corneum, except in a somewhat immune-sensitive state that is more susceptible to external influences. Nevertheless, it is considered macroscopically that this "external" skin type is still relatively soft and dry to the touch. These are considered relatively hydrophobic. They exhibit a similar degree of hydration as other body points, a similar coefficient of friction (especially when absorbent materials are in close proximity to these tissues), and a degree of elasticity and compressibility, all three of which are Ellsner. Et al., "British Journal of Dermatology" (1990), 122, pages 607-614; Elsner et al., "Dermatologica" (1990), 181, pages 88-91]. From the labia majora to the labia minora (moving to the internal body surface) and to the interior (vaginal vaginal), a fundamental change in the properties of the skin or labia membrane occurs. The inner labia minora surface begins to have more mucosa membrane properties than the stratum corneum. Transition to the mucosa is completed as it moves from the labia to the vaginal palate. The tissue in the labia primary, especially the inwardly facing surface of the labia minora, is permanently moist and is believed to have a very large coefficient of friction, elasticity, and compressibility. These mucosas are large textured (irregular surfaces) and hydrophilic rather than hydrophobic.

Since the inner surface of the labia membrane is hydrophilic and large textured, this provides an ideal surface for transporting body feces for two reasons. First, the inner surface of the labia membrane is hydrophilic, which produces a large affinity for blood or other body excretion. Second, blood can move freely within the textured surface in naturally occurring channels present in the inner labia surface. This is challenging because products worn primarily in the labia need to be in intimate contact with the labia surface in order to effectively absorb body waste as a body excretory source. Blood can enter these channels and has great affinity for the medial labia membrane.

Ideally, the absorbent core structure of the interlabial product is of great suitability and compressibility, has an irregular structure, and a textured surface capable of transferring the inner labia surface, and in particular the body waste, out of the labia primary and onto the wearer's underwear. It can effectively contact the channels within. In addition, the absorbent core structure has a very high absorbent capacity per unit volume of the core and thus has high absorbency. The high absorbent capacity at the small core size (or volume of absorbent material) allows the product to be worn predominantly in the labia, even if the labia are relatively small in dimension and the space available to hold the absorbent body is small. It is important to ensure. Moreover, the absorbent body needs to actively oppose the hydrophilic inner labial surface for body excretion, and the absorbent core needs to exhibit a very high intake gradient to reliably pull the excrement into the absorbent body, which gradient There is a need to recover effectively during the wear cycle of the absorbent structure to ensure continuous performance throughout the product wear cycle.

Unfortunately, the solution of these two problems (via macro and micro suitability) leads to additional problems. The better the suitability and flexibility of the absorbent structure to comfortably conform to each woman's unique anatomical formation, the more the product worn between the labia is within the labia vestibule (or, if the same technology applies to this application). Reproducible and accurate positioning in the vagina becomes more difficult. In order to be able to control insertion into the labia, some degree of stiffness and structural integrity is required for absorbent products to achieve sufficient depth of insertion into these vestibules by spreading labia minora, labia majora and other tissues. In fact, achieving controllable and reproducible placement of the product while achieving a high degree of surface coverage through increased core suitability is a contradictory design requirement and generally speaking contradicts one another.

To address these conflicting requirements, an interlabial pad design consisting of three main elements is required.

① a highly suitable absorbent structure that can be macroscopically adapted to unique anatomical shapes,

② microscopically organized absorbent core / topsheet, and

Robust installation / insertion design features in the form of installers or reinforced keyed structures.

In addition to these aspects associated with the absorption of body feces, the absorbent core structure needs to have high flexibility to suit the unique shape and surface structure of each particular wearer without inconvenience.

Accordingly, there is a need for an absorbent core structure for a product that is capable of meeting these needs effectively and is being developed and composed mainly in the labia, consisting of the following three unique elements.

(1) A highly absorbent storage core element composed of absorbent gelling material (AGM). This means that AGM has a high absorption inhalation potential, is more efficient in storage than typical materials (ie cotton, rayon) (capacity greater than 3 times per gram of material to blood), and facilitates the use of smaller volume of absorbent cores. Because it makes.

Use of simply high loft body contact and excretory acquisition layers on the body side of the AGM comprising an absorbent core. The high loft fibrous layer is compressible and adaptable and can be adjusted to conform to the inner labia surface structure to fill with various channels capable of transporting or collecting body feces.

③ Needle punching technique that combines these two layers and also works to dramatically improve core efficiency and the amount of body excretion that the storage core can accommodate.

Moreover, products that are primarily worn in the interlabial area are often small enough to be potentially flushable with the automatic disposal method (ejection during urination).

Traditionally, on absorbent articles worn externally, such as sanitary napkins (primarily in contact with "outer" body surfaces), hydrophilic topsheets or hydrophilic hydrophobic topsheets (eg, with surfactants) have been applied to the absorbent core structure. It has been used to ensure proper absorption and delivery of excreta. There has been a great deal of disclosure about methods for designing flexible and functional topsheets for use externally and in contact with dry, relatively smooth skin surfaces, such as in the perineal groove, buttock and medial thigh areas.

In the case of disposable absorbent articles (mainly in contact with "inner" body surfaces) worn inside, traditionally absorbent and hydrophilic topsheets, and in particular rayon topsheets (with biodegradability and flexibility) have placed the product under the toilet bowl. It has been selected for disposal by washing with water. In addition, such topsheets (particularly rayon webs) have been used in hybrid absorbent articles that are partially or wholly worn within the labia. However, the applicant is not perfectly suited to absorbent products in which conventional hydrophilic and especially absorbent hydrophilic topsheets are worn internally and in particular interlabial, and in fact they suffer from the recognition and discomfort of wearing such products during use. I found that it can be given quite a bit. This is in stark contrast to the known art which requires a soft, soft, hydrophilic topsheet, such as rayon or many nonwovens, which would be an ideal candidate for absorbent products for general women.

This contradiction with the prior art may perhaps be understood in view of the absorbent pads acting between the labia with absorbent hydrophilic topsheets such as rayon webs. Such topsheets can absorb labial secretions when placed in contact with the surface within the labia and in particular the "inward" side of the labia. Aside from the tendency to dry the labia membrane (one cause of discomfort and irritation), the topsheet has a natural tendency to adhere to the labia membrane through hydrophilic-hydrophilic compatibility. This provides another cause of discomfort when the labia membranes are very elastic and are required to deform / freely move relative to one another as well as physical movement. If the absorbent product is attached to such a membrane and cannot move with the same degree of elasticity, the process of adhering-shear may result in physical movements causing a certain level of discomfort (roughness and dry friction feeling) for the product user. Is set during.

Several approaches have been attempted to provide more comfortable and improved topsheets for such products. European patent application 0 685 215 A1 relates to "Vaginal moisture balanced tampon and process." This application relates to reducing epithelial tissue dryness in vagina by reducing capillary suction pressure of tampons at initial use. This is said to be done by using a hydrophobic component in the tampon, such as hydrophobic fibers and / or hydrophobic cover material, to change the capillary suction pressure on the surface of the tampon. Other means of obtaining low capillary suction pressure include increasing the denier of the fiber in the tampon absorbent core and / or reducing the density of the tampon.

US Patent No. 4,846,824 to Larsen et al., Entitled "Labial Sanitary Pad," discloses another approach. US Pat. No. 4,846,824 to Larsen et al. Describes maintaining moisture at an ideal level in the genitourinary region by using a physiologically functional cover. The term "physiologically hydrous" is intended to encompass a cover material that maintains a properly wet interface between the tissue of the vestibular tissue and the pad when located in the vestibular environment. An example of a highly preferred cover in US Pat. No. 4,846,824 to Larsen et al is made of spunlaced polyester, such as sold under the trade name "SONTARA" by EI DuPont Company. .

Thus, there is a need for an improved device that is worn adjacent to the wearer's functional body tissue, and this interlabial device will reduce the incidence of body and panty contamination when used. In particular, there is a need for a more comfortable and improved topsheet for such devices that contacts the wearer's inner labia minora surface and skin in the vaginal canal. Such devices should be easy to insert and comfortable to use. Preferably, such a device should be comfortable enough for daily use. In addition, the improved interlabial period has a sufficient capacity to achieve the purpose as a single product during a period of high menstruation during the menstrual cycle of the wearer and does not cause a problem of spilling out of the interlabial space when its absorbent capacity is exceeded. There is a need for a device. There is also a need for other types of absorbent devices having such topsheets, such as sanitary napkins, tampons, pantyliners, interlabial devices, incontinence devices, bandages, and the like.

Summary of the Invention

The present invention relates to an improved body contact surface or topsheet for an absorbent device that is in contact with the wearer's functional body tissue. Such functional body tissues may include, but are not limited to, functional tissues such as skin or tissue at the moment, and mucosal tissues such as vaginal tissues. In one non-limiting embodiment, the topsheet comprises a suitable hydrophilic and substantially hydrophobic nonabsorbent nonwoven web. The topsheet has a surface tension of about 45 dynes / cm or less, preferably about 40 dynes / cm or less. In one embodiment, the nonwoven web is mechanically deformed to be extensible in at least one direction in an amount of at least about 30% under a force of 50 g. Preferably, the topsheet is subjected to a caliper change of at least about 30% at a pressure of 1,000 Pa after a pressure of 250 Pa. The topsheet is placed on absorbent devices such as sanitary napkins, tampons, pantyliners, interlabial devices, incontinence devices, bandages and other products.

The invention also relates to absorbent devices such as sanitary napkins, tampons, pantyliners, interlabial devices, incontinence devices, bandages and other products having such improved topsheets. The term “interlabial device” refers to an absorbent device that is at least partially insertable into the interlabial space of a female wearer for menstrual purposes (including physiological blood and mid-cycle excretion), incontinence protection (including urine), or both .

In addition, the present invention relates to a method of capturing excrement from an excretory source on a wearer's body, wherein at least a portion of the excretory source is in a functional membrane having an irregular surface (eg, interlabial or intervaginal spaces of a female wearer). Is located. The method comprises providing an absorbent article with a liquid permeable top surface structure, wherein the top surface structure includes a body contact surface, the top surface having at least an extendable area, and the wearer Placing the absorbent article adjacent to the water-containing membrane of the body of the body, wherein the body contacting surface of the upper surface structure is at least partially in contact with the water-containing membrane.

The absorbent device using the topsheet may be any suitable structure known in the art, or may be a novel structure. In one non-limiting embodiment, the absorbent interlabial device includes a liquid permeable topsheet, a liquid impermeable backsheet coupled to the topsheet, and an absorbent core positioned between the topsheet and the backsheet. The device preferably comprises a desired bending axis which is preferably located generally along its longitudinal center line. When the device is folded along this axis and inserted into the interlabial space of the wearer, the topsheet remains in contact with the wall of the wearer's labia. Preferably the device comprises a biodegradable material. In some embodiments, the back sheet of the absorbent interlabial device is water dispersible. In other embodiments, the backsheet may be removed. The backsheet can be removed if the bottom side of the absorbent core is coated. Alternatively, the backsheet may be removed if the device is predominantly contained within the labia and the interlabial device is folded along the longitudinal axis. In this case, the device is considered to be an inverted "V" or "U" shaped cross-sectional structure, with the parts of this device normally provided with a backsheet being facing inward toward each other and in contact with the wearer's underwear. I will not. Removal of the backsheet improves the breathability of the device. The tab may be coupled to the underside of the device to facilitate insertion and optional removal of the device with a finger.

The invention also relates to an absorbent article insertable into the interlabial space of a female wearer comprising an absorbent storage core and a body-contact vaginal excretion receiving layer overlapping the storage core. The body-contact vaginal excreta receiving layer is compressible and adjustable to conform to the medial labia surface structure for filling in channels in the medial labia that carry and collect body feces. The absorbent storage core and the body-contact vaginal excretion receiving layer are arranged to communicate by needle punching. The absorbent storage core also includes an integral web of fibrous material, and optionally includes an absorbent gelling material and multiple penetrations. The absorbent article furthermore has an insertion means, which can be an installer or a collapsible reinforcement tab having a folding line integral with the article.

Although this specification concludes with the claims particularly pointed out and specifically claimed as it is intended to form the present invention, the invention may be better understood from the following detailed description, which is set forth in connection with the accompanying drawings.

1 is a plan view of a preferred embodiment of an absorbent interlabial device according to the present invention;

2 is a cross-sectional view of the absorbent interlabial device shown in FIG. 1, taken along line 2-2 of FIG.

3 is a side view of the absorbent interlabial device shown in FIG. 1;

4 shows the absorbent interlabial device of FIG. 1 folded along a preferred bending axis, with the wearer holding a finger for insertion;

5 is a sagittal cross-sectional view of a female wearer illustrating the placement of an absorbent interlabial device in the interlabial space of the wearer;

6 is a micrograph of a portion of one embodiment of a topsheet according to the present invention;

7 is a simplified diagram of an apparatus used to form a deformable network in a topsheet base material;

8 is a partial schematic perspective view showing a portion of a web of material in which a deformable network is formed;

9 is a scanning photograph of the topsheet material surface shown in FIG. 6;

10 is a scanned photograph of a prior art rayon nonwoven topsheet material,

11 is a graph of the surface area of various materials measured at various depths below the plane of the upper surface,

12 is a perspective view of the interlabial device,

FIG. 13 is a schematic side view showing a portion of an absorbent structure of the interlabial device shown in FIG. 12;

FIG. 14 is an alternative topsheet having a plurality of floors and valleys therein and also having a material for holding the topsheet in contact with the wearer's body located on at least a part of the floor on the body contacting surface of the topsheet. FIG. A schematic side view showing a portion of,

FIG. 15 shows a prior art sanitary napkin that can be used in a method of using a system of feminine hygiene products or can be used as part of a feminine protection kit with the absorbent interlabial device of the present invention. FIG.

FIG. 16 shows a typical prior art tampon that may be used in a method using a system of feminine hygiene products or as part of an additional feminine protection kit with the absorbent interlabial device of the present invention;

17 is a plan view of a device suitable for measuring the washing ability according to the method described in the Test Method section below;

FIG. 18 is a cross-sectional view of the flushing capacity measuring apparatus of FIG. 17 taken along line 18-18 of FIG. 17;

19 shows a simplified illustration of the basic elements of a needle punching machine,

20 is a plan view of the interlabial apparatus including the slits in the cross machining direction;

21 is a plan view of the interlabial device including fold lines into multiple sections,

22 is a plan view of the interlabial device in which the interlabial core of the interlabial device is divided into sections;

23 is a table showing data for evaluating the pollution control ability when used as a menstrual product and the level of comfort when worn for menstruation;

24 is a photograph at the start of the V bending test used to test the longitudinal stiffness of the interlabial product,

25 is a photograph of the V bending test used in the course of testing the longitudinal stiffness of the interlabial product,

26 is a photograph at the start of a free V bending test used to test the longitudinal stiffness of the interlabial product,

27 is a photograph of a free V bending test used in the course of testing the longitudinal stiffness of the interlabial product,

28 is a photograph at the beginning of the L bending test used to test the deformation resistance of the interlabial product along the transverse centerline of the interlabial product,

29 is a photograph of the L bending test used in the course of testing the deformation resistance of the interlabial product along the transverse centerline of the interlabial product,

30 is a photograph at the start of a kile stiffness test used to test the stiffness of an attached insertion / installation control member;

31 is a photograph at the start of a kile stiffness test used in the course of testing the stiffness of an attached insertion / installation control member;

32 is a graph showing an increase in absorbent capacity as a result of needle punching.

The present invention relates to an improved body contact surface or topsheet for an absorbent article or device, and more particularly to a comfortable topsheet when placed in contact with functional body tissue. The present invention also relates to absorbent devices such as sanitary napkins, tampons, pantyliners, interlabial devices, incontinence devices and bandages having such topsheets. Moreover, the present invention is directed to a method for capturing feces from a fecal source on a wearer's body, where at least a portion of the excretory source is located within a functional membrane having an irregular surface (eg, interlabial or intervaginal spaces of a female wearer). It is about.

1-5 show a non-limiting example of an absorbent interlabial device 20 that may have the improved topsheet 42 described herein. However, the present invention is not limited to use in the structure having the specific configuration shown in the drawings.

As used herein, the term "absorbent interlabial device" refers to a structure having at least some absorbent components and specially configured to be at least partially within the interlabial space of the female wearer during use. Preferably, when the absorbent interlabial device 20 is of an appropriate size for an individual wearer, at least about half of the entire absorbent interlabial device 20 of the present invention resides in this interlabial space. More preferably, almost all of the absorbent interlabial device 20 is in this interlabial space, and most preferably, the total absorbent interlabial device 20 is in this interlabial space of the female wearer in use.

As used herein, the term "interlabial space" refers to the space within the female anatomical vulva region located between the inner surface of the labia majora extending into the vestibular. Within this interlabial space are the major urogenital organs, including labia minora, vestibular, and clitoris, urinary tract, and vaginal opening. Standard medical authorities stipulate that the vestibular space is laterally bounded by the inner surface of the labia minora and extends internally to the floor between the clitoris and the vaginal opening. Thus, it will be appreciated that the interlabial space as described above may refer to the space between the inner surfaces of the labia majora, including the space between the inner surfaces of the labia minora, also known as the vestibular. For the purposes of this description, the interlabial space does not substantially extend beyond the vaginal opening into the vagina.

The term "labia" as used herein generally refers to both the labia majora and the labia minora. The labia terminated in anterior and posterior commissures, anterior and posterior, respectively. Those skilled in the art will recognize that there are many differences among women with regard to the relative size and shape of the labia majora and labia minora. However, it will not be necessary to specifically mention these differences for the purposes of this description. As described above, the placement of an absorbent interlabial device into the interlabial space of the wearer requires that for a particular wearer, placement between the inner surface of the labia is independent of the exact location of the interface between the labia and labia majora. Could be. For a more detailed description of the above description of female anatomy, see Gray's Anatomy, Running Press, 1901 (1974), pages 1025-1027.

The absorbent interlabial device 20 shown in FIG. 1 has a longitudinal center line L that lies along the "x" axis. As used herein, the term “longitudinal” refers to the interlabial area generally aligned with (eg, nearly parallel to) a vertical plane that bisects the standing wearer into half of the left and right bodies when wearing the interlabial device 20. It refers to a line, axis or direction in the plane of the device 20. As used herein, the terms "lateral", "lateral" or "y direction" refer to lines, axes or directions that are interchangeable and generally perpendicular to the longitudinal direction. The lateral direction is shown in the "y" direction in FIG. The absorbent interlabial device 20 shown in FIG. 1 also has a transverse centerline T. FIG. The "z" direction shown in FIG. 2 is a direction parallel to the above-mentioned number facing. The term "top" refers to the orientation towards the wearer's head in the "z" direction. "Lower" or "downward" is toward the wearer's foot.

The interlabial device 20 shown in FIGS. 1-3 is one preferred shape. The interlabial device 20 has a side (or "body contact side") 20A facing the body and an opposite bottom side 20B. The interlabial device is provided at the lower side 22B of the main body portion 22 to provide a pad-shaped main body portion (or "central absorbing portion") 22 and an entire interlabial device having a "T" cross-sectional shape. And any placement and removal tab 52 coupled. Main body portion 22 may have any suitable shape. Non-limiting examples of shapes for main body portion 22 when viewed from the top as in FIG. 1 include oval, elliptical, trapezoidal, rectangular, triangular, diamond, or any combination thereof. As shown in FIG. 1, the preferred plan view shape of the main body portion 22 and the entire absorbent interlabial device 20 is generally oval or elliptical. The plan view shape of the main body portion 22 is tapered from the transverse center line T toward the front and rear ends. In this embodiment, the main body portion 22 may be slightly tapered from front to back, although its lateral profile is relatively flat.

As shown in FIGS. 1 and 2, the interlabial device comprises a liquid permeable topsheet 42, a liquid impermeable backsheet 38 coupled to the topsheet 42, and a topsheet 42 and a backsheet. It is preferred to include an absorbent core 44 positioned between 38. The interlabial device 20 preferably has a size and shape such that at least a majority of the device 20 fits comfortably within the interlabial space of the wearer and also covers the wearer's vagina and preferably the wearer's urethra. Do. The interlabial device 20 at least partially blocks, more preferably completely blocks and obstructs the outflow of menstrual blood, urine, and other body exudates from the wearer's vagina and urethra.

The size of the interlabial device 20 is important for comfort and effectiveness. The length of the absorbent interlabial device 20 is measured along the longitudinal centerline L in the longitudinal direction (or "x" direction). The absorbent interlabial device 20 preferably has a length L _{1 that} is greater than about 40 mm and less than about 130 mm. More preferably, the length L ₁ is about 60 mm to about 100 mm. The width of the interlabial device 20 is measured along the transverse centerline T in the transverse direction (or "y" direction). The absorbent interlabial device 20 preferably has a width W _{1 that} is about 25 mm to about 60 mm. The thickness (or caliper) is the "z" direction dimension of the main body portion of the interlabial device 20. Caliper measurements given herein were measured using an AMES gauge with a load of 0.25 psi (1.7 kPa) (gauge) and a foot of 0.96 inch (2.44 cm) diameter. Those skilled in the art will appreciate that if a 0.96 inch (2.44 cm) foot is not suitable for a particular sample size, the load on the gauge maintains a limited pressure of 0.25 psi (1.7 kPa) (gauge) while the foot can be changed in size. Will change accordingly. The caliper T ₁ of the main body portion of the absorbent interlabial device 20 is preferably smaller than the width W ₁ and the length L ₁ . Preferably, the caliper T ₁ of the main body portion of the absorbent interlabial device 20 is about 8 mm or less, more preferably the caliper T ₁ is about 6 mm or less, and even more preferably the caliper is about 4 mm or less. to be.

In addition, the main body portion 22 of the interlabial device 20 preferably has flexibility, and more preferably has flexibility that is relatively high in flexibility but not difficult to insert. This will increase the wearing comfort of the interlabial device 20. The main body portion 22 of the interlabial device 20 preferably has flex resistance within the range disclosed in US Pat. No. 5,951,537, issued to Osborn on September 14, 1999.

The following section will describe in detail the improved fit and more controlled insertion of the interlabial device in the labia to achieve a deeper fit within the labia vestibule. Micro fit will be described in the needle punched core portion.

The configuration of the absorbent interlabial device 20 according to the specific size parameters given above results in a product with increased comfort and effectiveness compared to previous interlabial devices. For example, many women find interlabial pads shorter than the absorbent interlabial device 20 described herein, which is difficult to properly position within the interlabial space. Although such pads are properly positioned, they have an increased tendency to allow bypass outflow of body exudates around the edges of the pads.

The interlabial device 20 preferably has sufficient absorbency to absorb and retain exudate from the wearer's body. However, the capacity of the product depends at least in part on the physical volume of the absorbent interlabial device 20. The absorbent interlabial device preferably has a capacity of at least about 1 g of saline solution of 0.9% by weight, and may have a capacity of up to about 30 g by using an absorbent gel or foam that expands when wet. Preferably, the dose is typically in the range of about 2 g to 12 g for salts. More preferably, the volume of the interlabial device 20 is at least about 6 g for salts. Those skilled in the art will appreciate that the absorption capacity of body exudates, such as menstrual blood, is usually less than the salt absorption capacity described above. The method of measuring the absorbent capacity will be described in the test method section below. Since the interlabial space can expand, more volumes can be stored in the interlabial space, especially if the effluent is stored as a gel, which adjusts for body pressure. In addition, when the absorbent interlabial device 20 is not entirely present in the interlabial space of the wearer, some of the absorbed exudates may be stored externally in the interlabial space of the wearer.

Each component that may be suitable for various embodiments of the interlabial device 20 will be described in more detail with reference to FIGS. The following components of the interlabial device will be described in the order of the topsheet, absorbent core, slit, acquisition layer, backsheet, insertion means, and other modified embodiments of the absorbent device.

Top sheet

Topsheet 42 includes a first liquid permeable component. Topsheet 42 is liquid permeable to allow liquid (eg, menstrual blood and / or urine) to pass through its thickness easily. When the topsheet 42 is described herein as liquid permeable, if the topsheet is not liquid permeable by itself, the topsheet is used in combination with another layer, such as a bottom layer, that sucks liquid through the topsheet. It will be considered that this liquid permeability. The top sheet 42 should be compliant, soft to the wearer's skin, and non-irritating. In particular, topsheets used on absorbent devices that come into contact with the wearer's functional body tissue should be much more comfortable. These functional body tissues include, but are not limited to, functional tissues such as interlabial skin or tissues, and mucosal tissues such as vaginal tissues.

Suitable topsheets 42 include woven and nonwoven materials; Polymeric materials such as perforated thermoplastic films, perforated plastic films and hydroforming thermoplastic films; Porous foams; Reticular foam; Reticulated thermoplastic foams; And thermoplastic scrims. Suitable woven and nonwoven materials include natural fibers (eg, hydrophobized wood, rayon, or cotton), synthetic fibers (eg, polymeric fibers such as polyester, rayon, polypropylene, or polyethylene fibers), or natural And combinations of synthetic fibers. If the topsheet comprises a nonwoven material, the topsheet can be made by any suitable method. For example, the topsheet can be treated with carded, spunbonded, or the like.

The material of the topsheet described above (woven, nonwoven, film, etc.) may be made of a biodegradable material or a biodegradable material. As used herein, the term “biodegradable material” is determined after 28 days, when measured according to the stum test specified by Method 301B by the Organization for Economic Cooperation and Development of 75775 Paris Sedex 16 Rue Andr Pascal 2, France. It refers to a material having at least about 70% biodegradability (theoretical carbon dioxide emission rate). Preferably, the materials that make up the interlabial device of the present invention have a biodegradability of greater than about 80%, more preferably about 90% or more.

Topsheet 42 should have the improved properties described herein to be more comfortable to contact the wearer's functional body tissue. The topsheet preferably comprises a non-absorbent, moderately hydrophilic to substantially hydrophobic material. The critical surface tension of the top sheet is preferably 45 dynes / cm or less, more preferably 40 dynes / cm or less. Critical surface tension should be measured according to the critical surface tension test of the material in the test section. In a preferred embodiment, the topsheet is made as hydrophobic as possible to reduce the tendency to adhere to functional body tissue.

Preferably, the topsheet should be compressible and elastic so that it should be comfortable when placed adjacent to the wearer's functional body tissue. The compressibility is preferably measured under the load typically encountered when wearing a product having a topsheet thereon. The topsheet preferably receives a caliper change of at least about 30% under a pressure of 1,000 Pa after a pressure of 250 Pa. The top sheet 42 is preferably subjected to an absolute caliper change of about 0.15 mm or more under a pressure of 1,000 Pa after being subjected to a pressure of 250 Pa. Topsheet compressibility should be measured using the topsheet compressibility (thickness change) test described in the Test Methods section.

In addition, the topsheet 42 is preferably stretchable to elongate with the movement of the wearer's body, in particular with the movement of the functional body tissue of the wearer. Anatomically speaking, the wearer's labia belong to a relatively small range of motion of the body. Although the range in which the labia is expected to elongate as a result of motion is relatively small, due to the large extensibility of the labia, the topsheet is preferably elongated with minimal force as desired. The topsheet is preferably stretchable in at least one direction in an amount of about 30% or more under 50 gf. The topsheet 42 may be extensible in one direction, in two directions, in multiple directions, or in all directions (ie, the topsheet may be extensible in all directions).

In another embodiment, the topsheet 42 may provide comfort if one of the other properties of the topsheets quantified herein is increased if one of the properties quantified herein is less than disclosed herein. . For example, in one non-limiting embodiment, the topsheet 42 may have different combinations of compressibility and extensibility. For example, a suitable topsheet may have at least one unidirectional stretch of at least about 20% under 50 gf, and the topsheet may undergo a caliper change of at least about 40% when tested according to the topsheet compressibility / thickness change test.

The raw materials (or base materials) described above may need to be modified or modified (mechanically, chemically or otherwise) to provide these properties.

In one embodiment, the topsheet may be formed of a web that has been mechanically modified to provide these properties. 6 shows one suitable topsheet 42 for use in the present invention. The topsheet shown in FIG. 6 is a spunbonded nonwoven material mechanically modified and composed of polyethylene fibers having a basis weight of 23 g / m 2. The fibers preferably have a relatively fine denier, preferably about 5 or less, more preferably about 3 or less. One preferred base material having these properties is known as COROLIND nonwoven material available under the trade name PE HPC-2, code T23FOR from BBA Nonwovens (formerly Corovin GmbH), Piene, Germany. Such materials are mechanically deformed as described herein. Another suitable topsheet may be a mechanically modified nonwoven web composed of the biodegradable fibers of BIONELLE 3001 available from Showa High Polymer Co., Tokyo, Japan. These nonwoven materials may be mechanically deformed by ring rolling to form the topsheet 42 or by forming a deformable network therein.

In the embodiment shown in Figure 6, the nonwoven material is mechanically deformed by forming therein a deformable network. The deformable network is formed by a method that may be referred to herein as forming the topsheet base material into a stretchable elastic film (or “SELFing” the top base material). Such acronyms (ie, "SELFing" will be used to form a Stretchable Elastic-Like Film) will be used, but in this case the upper base material (and the structure formed by self-selling it) It will be understood that is not limited to films only. That is, other materials, such as nonwovens, may depend on how to form the deformable network therein.

A suitable method for forming a deformable network in the topsheet 42 is provided to Chappell et al. On May 21, 1996, and the invention is named "Web Materials Exhibiting Elastic-Like. Behavior, "US Patent No. 5,518,801. 7 is a simplified diagram of an apparatus used to form a deformable network in a topsheet base material. The apparatus 700 shown in FIG. 7 includes a pair of toothed rolls 702 and 704 that engage each other. In one non-limiting embodiment, the selfie method utilizes a “teeth” 706 of generally triangular shape that is round at the top. The teeth 706 used to form the embodiment shown in FIG. 6 are 2.5 mm high, the peaks of the teeth are spaced 0.6 mm apart, and there are 6.5 teeth per cm. The rolls 702, 704 may have a band 708 around the circumference where the teeth 706 are not provided to leave unformed areas in the base material.

8 is a schematic partial perspective view showing a portion of a web of material having a deformable network therein; Such webs are shown to be made of a continuous flat base material (similar to the way the film appears) rather than a number of fibers that are nonwoven materials. This makes the pattern of the deformable network more visible. As shown in FIG. 8, the deformable network includes a number of corrugations 66 that define the ridges and valleys. The corrugations 66 are separated by generally flat areas 64 oriented perpendicular to the ridges and valleys. The web material having a deformable network therein is extensible in the direction of the arrow.

As shown in Fig. 6, when the nonwoven material is subjected to only a self-treating treatment, it has an appearance similar to the schematic shown in Fig. 8. However, after conveying, processing, and assembling the nonwoven material into the interlabial device, the nonwoven topsheet may lose some of its corrugation properties, and may maintain this appearance (or a clearly defined corrugated structure). Nevertheless, without this clear definition, the ability of nonwoven materials to deform under compression and motion still exists. Although the compressive and flexible properties are smaller than the selted film, the selted nonwoven material is known to be much more comfortable.

By applying the self-surfing technique to the nonwoven web, the comfort is significantly improved. Without being bound by any particular theory, the selfie treatment imparts structures (hills and valleys) that reduce the overall surface area of the topsheet in contact with the functional body tissue (in this case, the labia membrane). In addition, the shelling provides extensibility and compressibility, and by opening the web up to reduce capillary suction through an increase in interfiber distance, the area of the topsheet that actually interacts with the labia membrane (via capillary suction) is defined by the labia membrane. It is possible to acclimate more freely to the labia membrane without applying capillary suction on these parts. This mechanical treatment is a fine slip point that significantly reduces the normal attachment-shear process (the tendency of the topsheet to shear from contact with the body after attaching to the body) during physical exercise, which leads to discomfort when wearing the pads in the interlabial area. To provide.

An alternative method of ring rolling or "pre-corrugating" the base material is US Patent No. 4,107,364, issued to Sisson on August 15, 1978, to Sabee on May 30, 1989. U.S. Patent 4,834,741, issued September 1, 1992 to Gerald M. Weber et al., U.S. Patent No. 5,143,679, issued October 20, 1992 to Kenneth B. Buell et al. United States Patent No. 5,156,793, and US Patent No. 5,167,897, issued December 1, 1992 to Gerald M Weber et al.

The webs used for the raw materials may be ring rolled or celled in one or more directions. For example, the web may be ring rolled or self-oriented in the longitudinal and transverse directions (in the final product). If the web is ring rolled or self-held in one direction, the web will stretch in one direction (the direction perpendicular to the waveform). If the web is ring rolled or self-held in two directions, the web will be extensible in two directions. The embodiment shown in FIG. 6 is only celled in one direction.

Another suitable type of topsheet 42 comprises a mechanically deformed and perforated molded film (using self or ring rolling). The perforated molded film penetrates the body exudates and, if properly perforated, reduces the tendency of the liquid to back up and rewet the wearer's skin. Thus, the surface of the molded film in contact with the body is kept dry, reducing body contamination and causing a more comfortable feeling for the wearer. Suitable molded films that can be mechanically deformed to form a more comfortable topsheet are those assigned to Thompson on December 30, 1975 and entitled "Absorptive Structures Having Tapered Capillaries". US Patent No. 3,929,135, issued to Mullane et al. On April 13, 1982, and entitled "Disposable Absorbent Article Having A Stain Resistant Topsheet". U.S. Patent No. 4,324,246, issued August 3, 1982 to Radel et al., Entitled U.S. Patent "Resilient Plastic Web Exhibiting Fiber-Like Properties." No. 4,342,314, issued July 31, 1984 to Ahr et al., Entitled " macro-expanded " United States Patent No. 4,463,045, Macroscopically Expanded Three-Dimensional Plastic Web Exhibiting Non-glossy Visible Surface and Cloth-Like Tactile Impression, issued to Ouellette et al. On January 20, 1987. Macroscopically Expanded Three-Dimensional Polymeric Web for Transmitting Both Dynamically Deposited and statically Contacted Fluids From to deliver all of the effluents that are dynamically attached and statically contacted from one surface to the other. One Surface to the Other, "US Pat. Nos. 4,637,819, US Pat. Nos. 4,609,518 and 4,269,643, issued to Curro et al. On September 2, 1986 and December 16, 1986, respectively, 4, 1991. US Patent No. 5,006,394 issued to Baird on May 9 and entitled "Multilayer Polymeric Film," and May 31, 1995. U.S. Patent Application No. 08 / 442,935, filed Jan. 11, 1996, entitled "Fluid Transport Webs Exhibiting Surface Energy Gradients", filed under the name of Zara Wellet. PCT Application Publication No. WO 96/00548).

9 is a scanned photograph of the surface of the topsheet material shown in FIG. 6. 9 shows that the topsheet material of the preferred embodiment described herein has irregular three-dimensional properties on its surface. This can be contrasted with FIG. 10, which is a scanned photograph of a prior art rayon nonwoven topsheet material. The three-dimensional surface structure of the topsheet material shown in FIG. 9 provides a structure having a relatively high compressibility with a relatively small force as described above. The surface of the prior art rayon nonwoven topsheet material shown in FIG. 10 is different in that it is generally regular and flat. Prior art rayon materials are relatively incompressible under the forces specified herein.

FIG. 11 is a graph of the surface area of various materials measured at various depths below the plane of the upper surface to quantify the three-dimensional properties of the topsheet. This graph is a graph of the bearing ratio of various materials that can be measured according to the surface roughness procedure described in the Test Methods section. This procedure takes a plane through the material at various depths below the plane disposed adjacent the highest point of the body's body contact surface. The measurement is obtained with the amount of the surface of the material lying on the plane at this depth. Several topsheet materials, ie the above-described self-contained COROLIND nonwoven materials, the aforementioned non-woven materials of ring rolled (RR) BIONELLE biodegradable fibers, hydroformed perforated films that are hydroformed and then mechanically unmodified, microlexed ( micrexed) A nonwoven material known as “P-9”, a flat (not mechanically deformed) COROLIND nonwoven material, and a flat rayon nonwoven material are shown in FIG. 11.

The amount of surface area of the self-corrugated COROLIND nonwoven material and the ring rolled BIONELLE topsheet material lying on the plane passing through these topsheets at a depth below 300 microns from the plane passing through the highest point of the body contacting surface is determined by these bearing ratios. About 15% or less of the surface area of the topsheet. Thus, below this depth the topsheet surface area is much greater, resulting in a larger three-dimensional structure. In addition, the topsheet for contacting the wearer's functional body tissue may be defined to have an amount of surface area lying on the plane passing through these topsheets at a depth of 400 microns of about 40% or less.

The topsheet 42 may have at least one opening 50 formed therein to aid in the acquisition of liquid into the interlabial device 20 (ie, in addition to the space between the fibers of the nonwoven web). Preferably, the topsheet 42 has a plurality of openings. The opening 50 can have any suitable size and shape. It may have any suitable number of openings. The openings 50 may be arranged in any suitable pattern. In some embodiments, it is desirable for the opening 50 to be distributed in the acquisition area or zone 54. Acquisition zone 54 may have any size, but preferably occupies less than about 30% of the useful absorbent surface area. The opening 50 has a combined open area, which can be any suitable proportion of the acquisition zone 54, but preferably the combined open area of the opening 50 is at least 10% of the area of the acquisition zone 54. There may also be an opening outside the acquisition zone 54. Preferably, the combined open area of the opening 50 in the acquisition zone 54 is greater than the combined open area of any opening in the area outside the acquisition zone 54.

For illustration purposes, FIG. 1 is shown as a non-limiting embodiment with 26 circular openings 50 each about 2 mm in diameter. The openings 50 are arranged in a diagonal relationship with each other in the acquisition zone 54, which is an elliptical shape similar to the shape of the outer edge of the interlabial device 20. In this embodiment, the surface area of the absorbent core 44 is about 2490 mm 2. The area of the acquisition zone 54 is about 520 mm 2. Thus, acquisition zone 54 occupies less than about 21% of the surface area of the available absorbent core. The combined open area of the opening 50 is 82 mm 2. The combined open area of the opening 50 is about 16% of the area of the acquisition zone 54.

In another non-limiting embodiment, the opening 50 is arranged in two rows oriented in the longitudinal direction, which rows are on each side of the longitudinal center line L. The openings in these rows have any suitable openings. For example, these columns can be centered about the transverse centerline T with seven openings in each column.

The opening 50 may be formed in the topsheet 42 prior to assembling one or more of the components of the absorbent article or after assembling one or more of the components of the absorbent article. For example, the opening 50 may be formed only in the topsheet material, after which the topsheet 42 may be coupled to other components of the absorbent article. In other embodiments, the topsheet 42 may be coupled to one or more components, and the topsheet 42 and the components coupled thereto are all perforated at the same time. Preferably, the opening 50 is formed after the topsheet 42 is bonded to the absorbent core 44, and both the topsheet 42 and the absorbent core 44 have an opening 50 formed therein.

The topsheet 42 is preferably coupled to other components of the absorbent article in such a way that the topsheet maintains its ability to stretch in response to the wearer's movement. The inner surface of the topsheet 42 may be fixed in contact with the underlying absorbent layer. This contact relationship allows the liquid to penetrate the topsheet 42 more quickly. The top sheet 42 may be maintained in contact with the bottom layer by bonding the top sheet to the bottom layer. However, joining the surface of the top sheet 42 to the surface of the lower layer is not necessarily essential. The topsheet 42 is made by fusing the topsheet 42 to the lower absorbent layer by entangled fibers of the bottom layer with the topsheet, by a plurality of separate melt joints, or any known in the art. By other means, it can be held in contact with the underlying absorbent component. The topsheet may also be held in contact with the underlying absorbent material due to the application of pressure on the body against the body contact surface of the interlabial device.

Another approach to achieving the desired topsheet with appropriate physical properties may include a hi-loft web made by airlaid or carded treatment. For example, suitable webs include a relatively low basis of staple fibers (length of about 8 mm) that comprise bicomponent binding fibers of moderate level (about <25%) and thermally bond the fiber webs without calendering. It can be produced by airlaying the weight (<30 gsm). For example, 40% PET [8 mm length Celanese # 295 polyester fiber available from Celanese AG, Summit, NJ], 40% Lyocel [available from Tencel Inc. of Mobile, Alabama] Fiber blends of 1.25 denier, 8 mm] and 20% bicomponent fibers (AL Adhesion 8 mm, 1.2 denier, C1.7 dtex from Fiber Visions, USA) are laid at a base weight of 20 gsm without calendering. Ideally, these fibers have a relatively low denier (<2 denier) to improve the apparent flexibility of the web. Alternatively, a calender process (using longer fibers of the same fiber described above) may be used to incorporate such webs by a thermal bonding step using through air bonding to effectively point bond each fiber within the web. Can be used to lay.

Absorbent core

The absorbent core 44 best shown in FIG. 2 is located between the topsheet 42 and the backsheet 38. The absorbent core 44 provides a means for absorbing exudate, such as menstrual blood and other body effluents. The absorbent core 44 is generally compressible, comfortable and preferably non-irritating to the user's skin. The absorbent core 44 can have any size and shape. Preferably, the absorbent core 44 has the same general shape as the entire absorbent interlabial device 20.

Absorbent core 44 may be comprised of any material capable of absorbing and / or retaining liquid (eg, menstrual blood and / or urine). The absorbent core 44 can be made from a wide range of liquid absorbent materials commonly used in absorbent articles, such as pulverized wood pulp, commonly referred to as air felt. Examples of other suitable absorbent materials include cotton fibers or cotton lintels; Creped cellulose wadding; Meltblown polymers including coforms; Chemically reinforced, modified or crosslinked cellulose fibers; Synthetic fibers such as crimped polyester fibers; Peat moss; Tissue, including tissue wraps and tissue laminates; Absorbent foams; Absorbent sponges; Superabsorbent polymer (fibrous or particulate); Absorbent gelling materials; Or any equivalent materials or combinations of these materials or mixtures thereof. Preferred absorbent materials include folded tissue, cotton batt, woven material, nonwoven web, rayon including needle punched rayon, thin layers of foam. The absorbent core 44 may be composed of a single material or a combination of materials.

One preferred material for the absorbent core 44 is the batting of a rayon or rayon / cotton blend. In one embodiment, the absorbent core 44 is a batting of a fiber comprising a 50% / 50% blend of baled bleached cotton fibers and baled rayon fibers. Trilobal rayon, known as GALAXY rayon, available from Accords, Mobile, Alabama, is known to be good for the materials that make up the absorbent core 44.

Storage core 44 may comprise any suitable amount of fibrous superabsorbent material. Some preferred ranges for the amount of fibrous superabsorbent material include about 25% to 100%, about 25% to about 70%, and about 25% to about 50% by weight. In addition, any range included within these ranges may be included. Higher concentrations of approximately (eg, 70% or more) designated superabsorbent material are particularly suitable when the storage core 44 comprises a high loft nonwoven material that is relatively open. Such high loft nonwoven materials can be, for example, carded nonwovens. Alternatively, instead of including a fibrous superabsorbent material, in a less preferred embodiment, the superabsorbent material may be in the form of particles or any other form known in the art. In other embodiments, storage core 44 may include superabsorbent material in other forms of combination.

Storage core 44 may be comprised of a high capacity, high concentration (of fibrous AGM) airlaid storage core. Airlaid processes, superabsorbent fibers, bicomponent fibers and air felt processes produce high capacity, high concentration airlaid storage cores (of fibrous AGM). The airlaid comprises a basis weight in the range of about 75 g / m 2 to about 500 g / m 2. The preferred range of basis weight is 100 g / m 2 to 400 g / m 2. The most preferred range is 150 g / m 2 to 350 g / m 2. The composition of the airlaid is fibrous AGM of 20% to 100%. The preferred composition of the fibrous AGM is about 30% to 70%. The most preferred composition of fibrous AGM is 35% to 60%. Bicomponent fibers are 3% to 12%. The preferred range of bicomponent fibers is 4% to 8%. The most preferred range is 4% to 6%. The remaining ingredient is air felt. The density is less than 0.2 g / cm 3. The density of the airlaid is preferably less than 0.16 g / cm 3 when measured under a pressure of 7.0 g / cm 2 (0.1 Psi), most preferably 0.10 g / cm 3 to 0.14 g / cm 3.

The fiber length of the superabsorbent fibers (SAF) is in the range of 6 mm to 12 mm, preferably 8 mm. Deniers of superabsorbent fibers range from 10 denier to 30 denier. The free swelling capacity of the fibers in the bovine blood is greater than 30 g / g, preferably greater than 40 g / g and most preferably greater than 50 g / g. The retention of superabsorbent fibers in bovine blood is greater than 20 g / g, preferably greater than 30 g / g and most preferably greater than 40 g / g at 0.5 Psi.

The length of the bicomponent fiber is 3 mm to 6 mm. The bicomponent C1.7 dtex, 4 mm fiber denier is less than 3 denier, preferably less than 2 denier obtained from AL Adhesion of Fiber Visions, USA.

The air felt comprises standard 100% kraft cellulose fibers obtained from Korsanas A-E, AB, Sweden. In addition, blends of standard kraft cellulose and more rigid, ie Eucalyptic fibers, are also suitable to keep the airlaid more open.

One non-limiting material suitable for use as the storage core 44 in the coalesced acquisition layer / storage core structure described above is about 45% FIBERDRY type 1162 superabsorbent fibers available from Camelot Technologies Ltd. of Alberta, Canada. Of AL Adhesion, which comprises a polypropylene core having about 49% air felt fluff available from Korsanas AE (Sweden) and a polyethylene sheath available from Fiber Vision, Covington, GA. ) From about 5% to about 6% of 4 mm long C1.7dtex bicomponent fibers.

One non-limiting preferred material suitable for use as the storage core 44 is a 300 g / m 2 airlaid composed of SAF, air felt and BiCo, ie 50% superabsorbent FiberDry available from Camelot Technologies Ltd. of Alberta, Canada. Airlaid consists of type 1162 fiber, 45% air felt fluff available from Korsanas AE, and 5% BiCo C1.25 dtex, 4 mm available from Fiber Visions AL Adhesion, USA. The storage cores are manufactured in an M & J (Netherlands) pilot airlaid line with two forming heads.

Another non-limiting preferred material suitable for use as the storage core 44 is a 200 g / m 2 airlaid composed of SAF, air felt and BiCo, ie 50% FiberDry type 1162 seconds available from Camelot Technologies Ltd. of Alberta, Canada. Airlaid consisting of absorbent fibers, 45% airfelt fluff available from Korsanas AE, and 5% C1.7dtex, 4mm BiCo available from Fiber Visions AL Adhesion. The storage cores are manufactured in the M & J (Netherlands) pilot airlaid line with two forming heads.

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Storage core 44 may be comprised of any suitable structure capable of effectively storing body excretion received from acquisition layer 46. In one preferred embodiment, the storage core 44 comprises a 300 g / m 2 airlaid layer composed of superabsorbent fibers, air felt and bicomponent fibers. Although the superabsorbent fibers can be distributed in the storage core in any suitable manner, it is desirable that the superabsorbent fibers be distributed substantially uniformly throughout the storage core 44. The storage core 44 is preferably composed of a high concentration (at least about 25% by weight) of fibrous superabsorbent material (or absorbent gelling material), preferably of high gel strength fibrous superabsorbent material.

Traditionally, these high concentrations of superabsorbent materials (particularly fibrous superabsorbent materials) are not expected to exhibit efficient core performance due to gel blocking. However, as shown in FIG. 13, by using a needle punching technique (eg, this technique is used to fabricate plush piled carpet), the acquisition layer 46 is formed by the storage core 44. It can be incorporated vertically directly into (fiber from the acquisition layer in the needle punching process is embedded through the storage core and fixed below). Without being bound by any particular theory, this technique ensures effective effluent transfer from acquisition layer 46 to storage core 44 without overflowing superabsorbent materials, while needle punched nonwoven from acquisition layer 46. The fibers actually help keep the storage core 44 open, both views preventing gel blocking.

13 illustrates another preferred absorbent core structure. FIG. 12 illustrates the relationship of a portion of the absorbent core structure shown in FIG. 13 to the entire interlabial device. The absorbent structure shown in FIG. 13 is particularly preferred when improved effluent handling is required. The absorbent structure includes an acquisition layer 46 and a novel structure composed of an absorbent core or “storage core” 44, wherein the acquisition layer 46 is combined with or associated with the storage core 44 by needle punching. Are " communicated arrangements ". The term “placed into communication” refers to a form in which one element is directly fixed to another by directly attaching another element to one element, and by attaching one element to an intermediate member attached to the other element. It includes a form in which one element is indirectly fixed to another element, a form in which one element is integral with another element, that is, a form in which one element is essentially part of another element.

In other variations, the acquisition layer in the absorbent core may be omitted entirely.

13 shows that the absorbent core 44 is needle punched. Needle punching is a method of mechanically interlocking a fiber web by physically repositioning a portion of the fiber when the fiber is laid or bundled from the horizontal orientation to the vertical orientation. The means for repositioning is a barbed needle, and repositioning the fiber penetrates the needle into the web in such a way that the barb carries groups of fibers from one layer to form a fiber plug, This is accomplished by withdrawing the needle in such a way as to keep it in these new positions. The needle should be less than about 40 gauge. Preferably, the needle should be in the 25 gauge range. The selection and setting of a relatively simple needle is chosen for the purpose of mainly incorporating the acquisition layer onto the storage core and reorienting the acquisition layer fiber into the vertical plane without significant densification of the acquisition layer. The stitch density is determined by the distance traveled and the number of penetrations per stroke.

Most stitched fabrics are made in flat form, but tubular fabrics with diameters ranging from a few millimeters to paper machine-felt dimensions may be made in specially designed machines. Fabric weights range from about 50 g / m 2 to about 5000 g / m 2 at stitch densities ranging from hundreds to thousands of penetrations per cm 2. Needle punching needles are produced by Foster Needle, Groz-Beckert and Singer.

In a non-limiting preferred embodiment of needle punching, the density of penetration is greater than about 10 penetrations per cm 2, more preferably greater than about 25 penetrations per cm 2, even more preferably greater than about 50 penetrations per cm 2. Big.

In a non-limiting preferred embodiment of needle punching, needle punching is performed at a sewing density of 100 needles per in ² , and the length of the carding and sewing fibers was about 1.5 inches (38 mm). Needle punched samples were supplied by Texel Inc. (Quebec Canada).

As shown in FIG. 19, most common needleloom structures are a single upper-board, downward stroke arrangement. Other arrangements include dual top-boards, single top-boards and bottom-boards, and dual top-boards and bottom-boards. In order to achieve a high penetration density on both sides of the fabric, the needle looms of various structures are arranged in a vertical row.

Needle looms are made in widths ranging from several cm to several m. Each manufacturer offers several kinds of mechanical designs that differ fundamentally in the width, arrangement and number of needleboards, and other parameters. In fact, all needle looms provide piercing motion using reciprocating motion.

This process uses a needle loom to change the web of loose fibers into a nonwoven fabric that is in close contact with each other. Various types of needle looms are well known in the art and function by joining nonwoven webs by mechanically oriented fibers through the webs. The needle loom can be operated to produce a patterned or non-patterned product.

Needle looms with low density boards are used to slightly consolidate the web and are called pre-needler or needle needletackers. Machines with multiple or high density needle capacities are often referred to as consolidation or finishing needle looms. Machines designed to produce patterned or raised surfaces are called structural looms and are used as mechanical finishing processes or for specific effects.

By varying the stroke per minute, the number of needles per loom, the rate of advancement of the batting, the degree of penetration of the needle and the weight of the batting, a wide range of fabric densities can be obtained.

The degree of interlocking depends primarily on the degree to which the needle penetrates the web (depth of penetration), the sewing density (the number of penetrations per unit area of fabric), and the number of groups of fibers repositioned per penetration (needle design).

The preferred embodiment has a hole distribution consisting of an irregular hole arrangement, each hole being separated (in any direction) from adjacent holes at a distance of 1 mm to 2 mm.

19 shows the basic elements of the needle puncher 231. The basic elements of the needle puncher are a web feed mechanism 225, a needle beam 226, and preferably a needle consisting of up to 150 needles / in ² , more preferably 75 needles / in ² to 100 needles / in ² . Needle board with 227, stripper plate 228, bed plate 229, and a fabric winding mechanism. The fiber web 230 (sometimes supported or reinforced by a scrim or other fabric) is guided between the metal bed and the stripper plate, which has an opening corresponding to the arrangement of the needles of the needleboard. The width of the fibrous web 230 preferably has a width of 50 cm.

During the downward stroke of the needle beam, each barb carries a group of fibers corresponding to the number of needles and the number of barbs per needle (up to 36 barbs) at a distance corresponding to the depth of penetration into the next web layer. During the upward stroke of the needle beam, the fibers are released from the barb and interlocking is created. At the end of the upward stroke, the fabric is advanced by the take-up device and the cycle is repeated. Line advancing speed is based on three criteria: ① the fiber orientation of the acquisition layer is mainly changed from horizontal to vertical orientation, ② the acquisition layer is firmly fixed into the storage core without significant densification of the layer, ③ the airlaid storage core The overall structural integrity of the layer is chosen not to be compromised.

As shown in FIG. 13, the needle punching process allows a plurality of vertical channels 48 to be formed in the storage core 44. There is also a portion 49 of the acquisition layer 46 underlying the storage core 44 as a result of the needle punching process. The needle punching process may pull the acquisition layer in the z direction, which may result in the portion 49 of the acquisition layer underlying the storage core. The portion 49 of the acquisition layer may be the same material as the acquisition layer 46, but need not be the same material.

In other variations, the topsheet 42 in the absorbent core may be omitted entirely. In this particular embodiment, the absorbent core 44 having a fuzzy layer is needle punched.

Similarly, in another variant embodiment, the acquisition layer 46 in the absorbent core may be omitted. In this particular embodiment, the absorbent core is needle punched.

32 is a graph comparing the core capacities of the interlabial device in the non-needle punched state with respect to the needle punched state. The test method used to evaluate each core capacity is either a demand absorbency test (DAT) or a horizontal gravitational wicking test as disclosed in PCT Application Publication No. WO 95/10996 to Richards et al. commonly referred to as wicking test (HGW). In this method, the core sample size is chosen to be 26 cm 2. Core dose in the HGW test can be measured using artificial menstrual blood solutions or synthetic urine solutions as disclosed in PCT Application Publication No. WO 95/10966. Suitable synthetic urine solutions are disclosed in PCT Application Publication No. WO 97/24096 to Bewick-Sonntag et al. In Figure 32, the value of the core capacity per gram of the absorbent material is determined by applying a compression pressure of 70 g / cm2 (1 psi) to freely remove liquid from the core after "initial uptake" in the HGW test. It is a measure of the test liquid remaining in the core. For the application of this pressure, the core is pressed at 30 second intervals between Whatman filter paper stacks.

In addition to needle punching, other techniques for incorporating fibers from the acquisition layer to the storage core include forced air flow, forced air jets, or even high pressure water jets (eg, hydroentanglement) to drive the fibers from the acquisition layer into the storage core. Hydro entangling techniques, etc. may be used. In the foregoing description, the storage core consists of two separate manufacturing steps, namely forming an airlaid core structure having a high proportion of fibrous AGM, and manufacturing a needle punched carded nonwoven web into the airlaid structure. It is shown that there is. Typically, such cores are manufactured at two separate locations using distributed manufacturing techniques not generally available at one manufacturing site. An approach to simplify this task is foreseen by mixing both manufacturing steps at the airlaid point of manufacture. That is, using a multi-head airlaid system, after airlaying both of the storage core layers using, for example, two first airlaying heads as described in detail above, one or more additional airlayings. It is possible to use the head to airlay the appropriate acquisition layer on top of this storage core. Incorporation of these layers is still possible using a more simplified stitching approach, such as achieved through the form of spiked calendering rolls. In this form, the spiked calendering roll serves the purpose of discharging the core to the desired thickness and also driving the fibers at regular intervals to transfer efficient effluent between these layers from the acquisition layer into the storage layer. By selecting the correct fibers, this acquisition layer can be comfortable enough to act as a practical topsheet to interfere with body tissues when the product is worn, eliminating the need for additional topsheets.

Slit

As shown in FIGS. 20-22, three runs were considered to achieve good contact of the interlabial pad with the inner labia surface for improved fit performance. As shown in FIG. 20, the first approach is to form multiple closely spaced slits 232 in the absorbent core. As shown in FIG. 21, the second approach is to form the desired fold line 233. As shown in FIG. 22, the third approach is to actually divide the core 44 into multiple sections 234 (by cutting the core into sections), whereby each section has the potential to move independently.

In a preferred embodiment, the method comprises a combination of steps of forming slits in the machining direction (MD) and / or in the cross machining direction (CD). The term "machining direction" as used herein refers to the direction of travel of the forming surface on which fibers are disposed thereon during the formation of an absorbent nonwoven web. The term "cross machining direction" as used herein refers to a direction perpendicular to the machining direction defined above.

As shown in FIG. 20, the first approach causes the absorbent interlabial device 20 to bend in multiple directions due to the number of slits 232 in the main absorbent portion 22. Such structures allow the product to more easily respond to stresses associated with body movement and better comply with a wide range of labia native structures. The simplest approach is to form multiple closely spaced slits 232 in the core, mainly in the cross-machining direction (CD), thereby allowing each core region to operate and move relatively independently, resulting in a unique surface at that point. Adapt to the structure. Another approach is to form multiple closely spaced slits in the core, mainly in the machining direction (MD), thereby allowing each core region to move and move relatively independently to conform to the unique surface structure present at that point. . An additional approach is to form multiple closely spaced slits (slits 232 formed in the cross machining direction) in the core in the machining direction (MD) and in the cross machining direction (CD), whereby each core region It operates and moves relatively independently to conform to the unique surface structure present at that point.

Forming slits in the core can be performed in one or two steps. In a typical two step operation, the core is slit in the machining direction as part of the offline of the needle punching setup. This produces a slitted core in one direction (MD) that maintains a high degree of completeness and residual MD tensile strength so that it can still be easily handled on high speed conversion lines. The second step may be performed on the conversion line by applying the second slit forming operation in the cross machining direction to complete the slit forming operation. Alternatively, complex bidirectional slit forming operations may be performed in one step on line as part of the overall product manufacturing procedure. In this setup, the slit may still be bidirectional as described in detail above, but is offset about 5 ° from the centerline of the manufacturing line, resulting in good slit formation and knife life.

In the slit formation setup in the machining direction MD, each slit is 5.0 mm to 10 mm in length, preferably about 7.0 mm, and is separated at least about 5 mm from the next slit in the machining direction MD. Each machining direction (MD) row of slits is separated by at least about 5.0 mm, preferably less than 10.0 mm in the next adjacent row. In the slit formation setup in the transverse machining direction (CD), each slit is 5.0 mm to 10 mm in length, preferably about 7.0 mm, and is separated at least about 5 mm from the next slit in the transverse machining direction (CD). . Each transverse machining direction (CD) row of slits is separated by at least about 5.0 mm, preferably less than 10.0 mm in the next adjacent row.

Other slitting forms are also feasible, and may include simple straight lines or only one-way slitting, or complex shapes and directions. In addition, the slits may be formed only in the machining direction MD or the transversal machining direction CD. Alternatively, at the most extreme, each core element may not be substantially attached to adjacent core elements, whereby each core element (or particles / members) may enter into each effective space in the labia vestibule to fill that space. Can be.

The needle punched core technology of the absorbent interlabial device 20 provides an excellent starting point to improve core suitability, macroscopically and microscopically. In the first stage of core fabrication, a needle punched core is produced that is relatively strong and features a high degree of core integrity. This core in its present form is not completely suitable for the shape and size of a wide range of labia vestibular. Through simple slit forming techniques, core suitability can be significantly increased to better fill the shape required to match an effective anatomical shape. As the core starts with a high degree of completeness, slit formation tends to change the core into a number of semi-individual elements that may be suitable for each dimension, but each element nevertheless treats effluent. Maintain the high degree of completeness required to maximize

As shown in FIG. 21, the second approach is to form the desired fold line 233. As shown in FIG. 22, a third approach is to divide the core 44 into multiple sections, whereby each section has the potential to move independently.

A fourth approach is to use absorbent particles (or beads) sealed within the interlabial bag, whereby the bag and the absorbent material can be adapted to any shape or contour that a woman can have. This choice represents the greatest degree of suitability for excluding the use of liquid gels or fluids as absorbent media. The particles can be larger than 100 microns in size.

In a preferred variant of the embodiment shown in FIG. 20, the upper surface of the structure has one or more slits or other desirable flexion zones so that the product can easily conform to the vertical pressure on the pelvic floor. It can have a non-linear surface of the pelvic flats to help accommodate between the clitoris and the perineum.

A series of examples has been elaborated to specify the main aspects of the interlabial product. The following examples will provide details on the material of the article.

(Example 1)

Product dimensions are 91mm x 46mm and 5.0mm calipers.

The product consists of the following materials.

A star bonded rayon topsheet of about 15 g / m 2, similar to that used as an overlap for tampons (particularly TAMPAX tampons) and supplied by BBA Nonwovens, Green Bay, Wisconsin.

The core material is a 50/50 blend of carded carbon cotton with a rayon and cotton blend. 50% Sarille L rayon fibers are combined with a 50% blend of 0.03% leomin processed cotton comber and supplied by Brannoc, North Devon, UK.

The backsheet is a polybutylene succinate adipate film colored by Ampacet 110361 available as BIONELLE 3001 and obtained from Showa High Polymer Co. of Tokyo, Japan. The backsheet is attached to the topsheet to form a peripheral seal through the crimping operation.

The core is attached to the backsheet by an integral keel structure (to provide a 20 mm width for the glue-free area in the center of the product) and two spiral hot melt adhesive bonds centered on either side of the 40 mm long and 8 mm wide dimensions. Attached.

The kill design is called an integrated kill design and is described in detail in PCT Application Publication No. WO 99/56689. Due to this design and the lack of any structural integrity, this kill design does not assist in the insertion / application of controlled and renewable products. On the other hand, such a design has high flexibility, and thus is not inconvenient during wearing.

(Example 2)

Product dimensions are 91mm x 46mm and 6.0mm calipers.

The product consists of the following materials.

Vliesstoffwerke Christian Heinrich Sandler GmbH & Co. under the trade name Sawabond 4313. Thermal bonded nonwoven fabric with a basis weight of 17 gsm manufactured by KG [Schwarzenbach / saale, Germany]. The topsheet was mechanically modified to improve comfort as described in detail and claimed in US patent application Ser. No. 09 / 637,440, filed August 11,2000.

The absorbent core structure is a 60 gsm nonwoven consisting of 50% PET (Celanese # 295 from Celanese AG, Summit, NJ) and 50% Rayon / CMC Alloy fiber (application code 2014 from Accords, Mobil, Alabama). Acquisition layer (Texel Inc., Quebec, Canada), 42% air felt (Korsanas AE, Sweden), fibrous AGM (Fiberdry 1162, Camelot, Alberta), and 8% bicomponent fiber (Georgia, USA) The 300 gsm absorbent airlaid core, made up of a homogeneous blend of AL Adhesion C1.7dtex from FiberVisions, Covington, was joined by needle punching operations. Needle punching was performed by Texel Inc. (Quebec, Canada) and the core material was supplied to The Procter & Gamble (Cincinnati, Ohio) under code Texel 04354.5.

The core flexibility was reinforced by applying slits of parallel lines (spaced with a 5 mm gap), oriented in the machining direction, each 10 mm in length and separated by 5 mm for the next slit. This slit runs from the top to the bottom of the core and through its depth completely slits in the material.

The backsheet is a polybutylene succinate adipic acid film obtained from Showa High Polymer Co. of Tokyo, Japan, colored with Ampacet 110361 available as BIONELLE 3001. The backsheet is attached to the topsheet to form a peripheral seal through the crimping operation.

The core has two spiral hot melt adhesive joints that are centered (outwardly applied) with a keel structure (to provide a 20 mm width for the glue-free area in the center of the product) and centered on either side of the 40 mm long and 8 mm wide dimensions Is attached to the back sheet.

The kill design selected in this example is simply an externally applied kill design as shown in FIG. 3. It is attached to the backsheet in an inward orientation and over a distance of 27 mm in length and 4 mm in width (contact area with the backsheet is 108 mm 2). The keel that can be gripped (projected onto the backsheet) is 27 mm long and projects 13 mm above the backsheet. The grippable area is 310 mm 2 (slightly tapered on the end). The materials used for these laminated kill structures are 80 gsm multi-adhesive airlaid supplied by Buckeye Technologies (Memphis, Tennessee, USA), and under the trade name COROLIND (PE HPC-2) by BBA (Piene, Germany). It consists of 23gsm nonwovens supplied. Due to its simple form design and the flexibility of the material chosen, this kill design does not aid in the insertion / application of controlled and renewable products. On the other hand, such a design has high flexibility, and thus is not inconvenient during wearing.

(Example 3)

Product dimensions are 91 mm x 46 mm and 6.0 mm calipers and consist of the same material and the same kill design as Example 2. The flexibility of the entire product and its suitability for the labia vestibular structure were reinforced by an alternative core slit design that was chosen in Example 2. Everything else remains the same except for the following.

-Suitability for core flexibility and labia vestibular slit oriented in the cross-machining direction (transverse to the product length), each 10 mm in length, separated by 5 mm for the next slit (spaced with a 5 mm gap) It is further reinforced by applying. This slit runs from the top to the bottom of the core structure and through its depth completely slits in the material. This alternative slit formation pattern reduces the force required to flex the product in V-bend and L-bend tests, making it easier to insert / apply the product deeper into the labia vestibule.

(Example 4)

Product dimensions are 91 mm x 46 mm and 6.0 mm calipers, constructed from the same materials as Example 2. However, the product has improved its flexibility and suitability for a wider vulva vestibular shape, and an excellent kill design for insertion control has been used. Everything else remains the same except for the following.

-Core flexibility and suitability for wider labia vestibular shape and size were further reinforced by applying slits oriented in the machining direction (direction along the product centerline) and the transverse machining direction (transverse to the product length). . Each slit (in each direction) is 6.5 mm long, separated by a 5 mm gap for the next slit. This slit runs from the top to the bottom of the core structure and through its depth completely slits in the material. This alternative slit formation pattern allows for greater separation of each core element from neighboring elements and further improves three-dimensional fit for the labia surface structure. Compared to Example 2, this facilitates inserting / applying the product much deeper into the labia vestibule, allowing this without increasing the force required to flex the product in the V- and L-bend tests.

The kill design selected in this example is an externally applied kill design as shown in FIG. 3. It is attached to the backsheet in an outward orientation and over a distance of 27 mm in length and 11 mm in width (contact area with the backsheet is ˜380 mm 2 with insignificant edge rounding). The keel that can be gripped (projected onto the backsheet) is 27 mm long and projects 20 mm above the backsheet. The grippable area is 500 mm 2 (slightly tapered on the end). The materials used for these laminated kill structures include 80gsm multi-adhesive airlaid supplied by Buckeye Technologies (Meppis, Tennessee, USA) and the trade name COROLIND (laminated on both sides of the airlaid by BBA, Piene, Germany). It consists of 23gsm nonwovens supplied to PE HPC-2). Due to the design of the reinforced structure, this kill design facilitates the very deep insertion / application of controlled and renewable products into the labia vestibule. However, due to its size (which adheres to the backsheet (270 mm 2) and also protrudes above the back sheet (500 mm 2)), and the relative stiffness of the material used to form the keel structure, such kills may not be available to some users of the product. Too deep insertion and kill stiffness, excessive size). It is clear that this stiffness shows a higher value for this example in the kill stiffness test method.

(Example 5)

Product dimensions are 91 mm x 46 mm and 6.0 mm calipers, constructed from the same materials as Example 2. In addition, the core flexibility improvements described in detail in Example 4 were applied exactly to this example. In this example, only the kill design is modified as compared to the design selected in Example 4. Everything else remains the same except for the following.

The kill design selected in this example is an externally applied kill design as shown in FIG. 3. It is attached to the backsheet in an outward orientation and also over a distance of 20 mm long and 11 mm wide (contact area with the backsheet is ˜220 mm 2 with no significant edge rounding). The keel that can be gripped (projected onto the backsheet) is 27 mm long and projects 20 mm above the backsheet. The grippable area is ˜500 mm 2 (a tapered design where the keel is narrower than the position on which the back sheet is attached). Materials used for such laminated kill structures include 80 gsm multi-adhesive airlaid supplied by Buckeye Technologies (Memphis, Tennessee, USA) and BBA (Piene, Germany) as used in Examples 2 and 3 Likewise) it consists of a 23 gsm nonwoven supplied under the trade name COROLIND (PE HPC-2) laminated on only one side of the airlaid. Due to the wider attachment area of the kill and good grippable area for the backsheet (compared to Examples 2 and 3), this kill design is invariably controlled and reproducible compared to the kill design used in Examples 2 and 3. It facilitates the deep insertion / application of the product into the labia vestibule. The kill stiffness in this example is greater than the stiffness in Examples 2 and 3, which provides good insertion control, but less than the stiffness of Example 2, which causes discomfort for some of the product users. See the result data for the kill stiffness test method.

As shown in FIG. 23, Examples 1-5 listed in the data table were evaluated for contamination control ability when used as a menstrual product or level of comfort when worn for menstruation.

Evaluating product contamination performance in use is particularly useful when evaluating products that will be worn primarily within the labia due to the complexity of how heavily loaded the products are and where they are worn on the body. Standard in-use contamination assessment protocols have been developed to assess product contamination performance when women wear during menstruation.

Standard in use contamination protocols have several main steps. First, a group of at least 20 women is selected who regularly use menstrual products such as pads or tampons. Women with very low menstruation or women with excess menstruation should be excluded. Second, five test products and five control standard products are provided to women. Women should use the product alternately. Third, the product and underwear are carefully packaged and immediately taken back to the laboratory to evaluate the contamination of the product in detail and to evaluate the product for the presence of contamination on the underwear. To assess how contamination is affected by the choice of materials such as absorbent cores or topsheets, this protocol should be implemented for users who are very experienced with these products (using these products for at least five consecutive menstrual cycles). For this protocol, Example 1 above, which serves as a control standard, was evaluated against Example 2 above, which features the improved core technology detailed in this application. Upon completion of the test, the amount of contamination as a function of the amount of load for each example is measured from the recovered product. Considering all products with loads up to 2 g, the control standard (Example 1 above) has 70% of these products contaminated on underwear during use. On the other hand, Example 2 above, featuring the improved needle punched core technology, has only 40% of these products contaminated on the underwear during use.

In addition, the level of contamination a woman experiences while wearing such a product depends on the level of experience and familiarity with the product. Inexperienced users are unable to insert the product to the optimal depth within the labia vestibule. This may occur due to the fear of placing the product too deeply or the inconvenience experienced during application of the product. To evaluate the comfort and contamination performance of the improved fit design, we conducted in-use contamination studies as detailed above, but in this case did not experience too much of this type of product. Select the product type up to two times in the previous menstrual cycle). This provides a more sensitive test protocol for product design changes, including fitting. In this protocol, Example 3 above (which has an improved slit forming design compared to Example 2 above, which began to improve both product fit and comfort in use), which serves as a control standard, was modified to improve the fit during use. Evaluation was made with respect to Example 4 above with features of slit formation and kill design. At the completion of the test, the amount of contamination as a function of the amount of load for each example was measured from the recovered product. Considering all products with loads up to 2 g, Example 3 above had 27% of these products contaminated on underwear during use. On the other hand, Example 4 above, which features improved core fit and product application techniques, has only 17% of these products contaminated on the underwear during use. In this test, Example 3 above was considered to be more comfortable to wear than Example 4 above, in which the attached kills were stronger and extended in length. Example 5 above has a modified kill that is further improved to further improve the comfort of use during use.

In a more preferred variant, the amount of biodegradable bicomponent fibers is further reduced by about 4% to improve the degradability and decomposability of the entire storage core. The storage core must achieve a level of "product degradability" of at least greater than 35% after 28 days in the 28 day sludge test method. More preferably, the "product degradability" is greater than 70% after 28 days in the 28 day sludge test method. Even more preferably, the value is greater than 95% after 28 days, and most preferably the value is already greater than 90% after 7 days in this test. The core disclosed in Example 5 above achieves a level of degradability of 90% after only 7 days and a level of 95% after 28 days.

Alternatively, storage core 44 may comprise a biodegradable bicomponent fiber to aid in biodegradability of the product, or alternatively EVA-based available from Air Products Inc. (Allentown, PA) A water soluble latex binder such as latex binder type Airflex192 can be used to impart integrity to the airlaid storage core 44 while having good biodegradability. Another approach to improving the biodegradability of the cores while minimizing the use of binders is to exploit the natural adhesion of fibrous AGM in a wet environment to bond the cores and achieve the desired core integrity. This allows a fibrous stream, such as present in the forming head, to pass through the nebula water spray zone, for example during the airlaid process, so that the fibrous AGM on the absorbing portion of this moisture is sticky during transport through the moisture zone. And separate point junctions can be made by joining neighboring fibers into a cohesive core structure. Excess moisture is removed as the web passes through a conventional oven typically in this line. In one non-limiting embodiment, the storage core 44 can be fabricated on a standard heat bonded airlaid line with two or more forming heads, which form a combined multi-layered structure.

Acquisition

Acquisition layer 46 may comprise any suitable structure capable of quickly absorbing body effluent. Suitable types of acquisition layers are generally disclosed in US Pat. No. 5,591,149, issued January 7, 1997 to Cree et al. In one preferred embodiment, the acquisition layer 46 comprises a very lofted nonwoven web with a fluff appearance. The meaning of the term "high loft" is known to those skilled in the art of handling nonwoven materials. This fluff-like layer has a high z-direction (downward) wicking capacity that allows better contact of vaginal excretion, such as blood, that may be trapped or wicked within the labia membrane fold through an opening in the topsheet. It is designed to carry these feces downward to the high suction storage core 44.

One non-limiting material suitable for use as the acquisition layer 46 has a basis weight of about 30 g / m 2 to 140 g / m 2. In a preferred form of this embodiment, the acquisition layer has a basis weight of about 50 g / m 2 to 80 g / m 2. Most preferred forms have a basis weight of about 60 g / m 2. The compositions vary widely and are based on the final product application of flushable products containing biodegradable fibers such as rayon, polyacetic acid and the like. The caliper of the acquisition layer 46 before stitching is less than 4 mm, preferably less than 3 mm and most preferably less than 2.5 mm when measured under a pressure of 7.0 g / cm 2 (0.1 psi). The caliper of the acquisition layer 46 after stitching is less than 3 mm, preferably less than 2 mm and most preferably less than 1.5 mm when measured under a pressure of 7.0 g / cm 2 (0.1 psi). The density of the acquisition layer 46 is less than 0.1 g / ccm, preferably less than 0.07 g / ccm and most preferably less than 0.05 g / ccm when measured under a pressure of 7.0 g / cm 2 (0.1 psi). to be. The fibers in the acquisition layer 46 are preferably less than 6 denier, more preferably less than 4 denier. The fiber may be a blend of two or more fiber types and denier. The carded fiber length is less than 100 mm, preferably 35 mm to 100 mm.

One non-limiting material suitable for use as the acquisition layer 46 is a 60 g / m 2 carded nonwoven layer composed of a mixture of polyethylene terephthalate (PET, polyester) fibers and polypropylene fibers. In a preferred form of this embodiment, acquisition layer 46 is obtained from about 75% by weight Celanese # 295 polyester fiber and Fiber Visions, Covington, GA, available from Celanese AG, Summit, NJ. About 25% by weight of FiberVision # 163024 polypropylene fibers.

Another non-limiting material suitable for use as acquisition layer 46 is a 60 g / m 2 carded nonwoven layer comprised of a mixture of hydrophilic rayon and hydrophobic treated rayon, such that storage core 44 provides the ability to store feces. This ensures effective wicking and transport of the body waste to the storage core 44 without rayon against it. Acquisition layer 46 is a conventional, tri-lobal, GALAXY hydrophilic tridene fiber containing 0.01% LEOMIN (known as "ASLAN" in Europe) processing (hydrophobic processing, usually acting as a processing aid). Consists of 40% rayon and 60% conventional triangular GALAXY rayon treated with hydrophobicity of three-denier fibers, including 0.3% LEOMIN (ASLAN) processing, both fibers by Acordis (Mobil, Alabama, USA) Supplied.

In a preferred, non-limiting form of this embodiment, the acquisition layer is a conventional tri-lobal GALAXY hydrophilic of the 3 denier fibers comprising 0.01% LEOMIN processing supplied by Acordis (Mobil, Alab.). About 40% by weight of rayon and about 60% by weight of fiber providing performance equivalent to BIONELLE 3001 biodegradable fiber or biodegradable fiber obtained from Showa High Polymer Co., Tokyo, Japan. After the acquisition layer 46 is manufactured, it may be physically coupled to the storage core through a needle punching process by Texel, Inc. of Quebec, Canada.

In a preferred non-limiting form of this embodiment, the acquisition layer is about 60 g / m 2 carded treated with biodegradable PET and Rayon, i.e. 50% biodegradable polyester fiber (tbc) and 50% Acordis type 2014 Rayon. And later sewn nonwoven layers. Textel Inc. of Quebec, Canada, manufactures these materials by needle punching the acquisition layer into the storage core.

One non-limiting material suitable for use as the acquisition layer 46 is a 60 g / m 2 carded nonwoven layer composed of a mixture of polyethylene terephthalate (PET, polyester) fibers and polypropylene fibers. In a preferred form of this embodiment, acquisition layer 46 is obtained from about 75% by weight Celanese # 295 polyester fiber and Fiber Visions, Covington, GA, available from Celanese AG, Summit, NJ. About 25% by weight of FiberVision # 163024 polypropylene fibers.

In other embodiments, the absorbent core 44 may be comprised of multiple individual layers of the same material or of different materials (such as layers of absorbent material having different absorbent properties), where the individual layers are separated for disposal. It is easily detachable to make it possible.

In a variant embodiment, instead of providing a topsheet with the comfort reinforcing properties described herein, the topsheet 42 may be a highly open material or a very thin material, and the acquisition layer 46 (or absorbent core) A lower layer such as (44) may be provided with the comfort reinforcing properties of the topsheet 42 described above. This topsheet 42 primarily acts to retain the fibers in the lower acquisition layer 46 or core 44. That is, a product is provided that includes a first component (top sheet 42, etc.) having an opening therein, and a second component (acquisition layer 46, etc.) underlying the first component. Can be. The second component may have a portion that lies below the opening in the first component, and the portion of the second component that lies below the opening in the first component may form part of the top or body contact surface of the product. In other alternative embodiments, all of the topsheet may be omitted, and the body contact layer may be the acquisition layer 46 or the absorbent core 44, and the acquisition layer 46 or the absorbent core 44 may be attached to the topsheet. The properties described herein for the properties (properties to improve the comfort of the top sheet) can be provided.

Back sheet

The backsheet 38, best shown in FIGS. 2 and 3, is a product and / or body such as pants, pajamas, underwear, pubic hair, thighs of the wearer, etc., which may come into contact with the absorbent interlabial device 20. The portion is absorbed into the absorbent core 44 to prevent the contained exudates from soaking. The backsheet 38 is flexible and should be liquid (eg, menstrual blood and / or urine) impermeable. As used herein, the term "flexible" refers to a material that is flexible and can readily conform to the alternative shape and contour of the human body. The backsheet 38 also provides protection for the wearer's finger when inserting the absorbent interlabial device 20 or when the device is selectively removed with a finger.

The backsheet 38 may include a woven or nonwoven material, a polymer film such as a thermoplastic film of polyethylene or polypropylene, a composite material such as a film coated nonwoven material, or an organic material such as a collagen film. Other suitable materials include biodegradable polymers that can be made into films and the like, and dispersible materials such as polyvinyl alcohol. Suitable biodegradable polymers include BIONELLE 3001, available from Showa High Polymer Co., Tokyo, Japan, BAK 403 biodegradable polymer, available from Bayer AG, Leverkusen, Germany, and Bicorp Co., distributor of Novamont SPA, Rome, Italy. Matter Bi ZF03U-A available from Bios, Biopol biodegradable polymers available from Monsanto. In one embodiment, the back sheet is preferably made from a polyethylene film having a thickness of about 0.012 mm (0.5 mil) to 0.051 mm (2.0 mil). An example of a polyethylene film is one manufactured under the name P18-0401 by Clopay Corporation, Cincinnati, Ohio. However, preferably, the backsheet 38 may comprise a film having the same thickness as this polyethylene film, and only this film is made of a biodegradable polymer such as the BIONELLE biodegradable polymer described above.

In addition, the backsheet 38 may allow vapor to escape from the interlabial device 20 (ie, breathable) and still prevent exudates from passing through the backsheet. Suitable breathable backsheets are laminates of perforated films, such as those disclosed in U.S. Patent No. 3,929,135 to Thomson, in which the smaller openings of tapered capillaries are microporous, such as those disclosed in U.S. Patent No. 4,777,073 to Exxon Inverted to face the absorbent core 44 adhesively laminated to the film.

In a preferred embodiment, the backsheet 38 is dispersible and / or soluble in water. Polyvinyl alcohol (including a copolymer of polyvinyl alcohol) is known to be suitable as a material for the soluble backsheet 38. The polyvinyl alcohol may be coated on a tissue, ie a nonwoven material such as a biodegradable nonwoven material (eg rayon), or may be coated with a wax or other hydrophobic coating such as paraffin to reduce the rate of dissolution in water. This allows the backsheet to maintain its integrity during use, while maintaining the ability to dissolve in water during disposal of the interlabial device 20.

In a preferred embodiment, the backsheet 38 is dispersible and / or soluble in water. The term "dispersible" as applied herein for an absorbent interlabial device or component thereof, applies to a product or material that disperses into at least two pieces in gently stirred water. Such devices will break into pieces in conventional toilet and / or home plumbing systems and will eventually be effectively disposed of through the sewage treatment system. The term "dissolvable" as applied herein to an absorbent interlabial device or component thereof may be at least partially dissolved and visually distinguishable from a liquid medium that is essentially in liquid form or otherwise dissolved. Applicable to missing products or materials.

In another embodiment, the backsheet can be removed. In some embodiments, the backsheet may be removed when the bottom side of the absorbent core is coated or otherwise treated to produce a backsheet that resists the passage of liquid. Alternatively, if the interlabial device 20 is folded along the longitudinal axis A (as shown in FIG. 4), in particular if the device is mainly housed within the labia, the interlabial device is usually provided with a backsheet ( The lower side of the two halves of 20) will contact each other (ie, after the user's finger is removed), and the body portion of the interlabial device 20 will have an inverted "V" or inverted "U" cross section structure. will be. In this case, the portion of the interlabial device, usually provided with the backsheet, does not come into contact with the wearer's clothing and thus does not require a backsheet. Removal of the backsheet will improve the breathability of the interlabial device.

The components of the absorbent interlabial device 20 described above (the top sheet 42, the back sheet 38 (if present), the acquisition layer 46 (if present) and the absorbent core 44) are optional. Can be assembled in a suitable manner. The component may or may not be needle punched. 1 to 3, the components of the body portion 22 are assembled in a "sandwich" configuration, where the edges of the topsheet 42 and backsheet 38 are absorbent cores. It is sized to extend outward beyond the edge of 44.

The components of the interlabial device 20 may be coupled to each other in any suitable manner. As used herein, the term "joined" refers to a configuration in which one element is directly fixed to another by attaching one element directly to another element, and by attaching one element to an intermediate member that is alternately attached to the other element. It includes a configuration in which one element is indirectly fixed to the other element, and a configuration in which one element is integral with the other element, that is, one element inherently part of another element.

In the embodiment shown in FIGS. 1-3, the topsheet 42 and backsheet 38 are preferably joined at least partially at the periphery using known techniques. As shown in Figures 1 and 2, the top sheet 42 is preferably fixed to the back sheet 38 along the seam 60. Seam 60 is preferably liquid impermeable. Seam 60 may be formed by any means commonly used in the art for this purpose, such as glue bonding, crimping or heat sealing. The area of the seam 60 and interlabial device 20 near the seam 60 should be flexible, compressible, and compliant. If the seam 60 and the surrounding area are not too strong or compressible, the wearer may feel uncomfortable when wearing the interlabial device 20.

In addition to the perimeter seam, the components of the absorbent interlabial device 20 may be coupled to one another on their faces. The face of the components of the interlabial device 20 may be meltblown with adhesive, stitching, heating and / or pressure bonding, dynamic bonding, and fibers comprising one component onto another component. mixing or entanglement of fibers or other structural elements comprising the components of the absorbent interlabial device 20, such as by melting, extruding one component onto another, and the like, known in the art. May be combined with each other by any other means. Components of the absorbent interlabial device 20 may be combined with a water soluble adhesive to increase the tendency of the device 20 to disperse into multiple pieces in gently stirred water (eg, in a toilet). Thus, it is desirable for the material that couples the components to lose strength when exposed to large amounts of water, such as when disposed in a toilet. Water soluble or water dispersible adhesives such as those based on carboxymethyl cellulose, polyvinyl alcohol, grass, and the like are well known in the art.

Insertion means for interlabial devices

As described above, the absorbent interlabial device 20 is designed to be placed into the interlabial space of the wearer. As shown in FIG. 4, in order to use an absorbent interlabial device, the wearer grasps the tab 52 of the interlabial device 20. If the interlabial device 20 does not have a tab 52, the wearer may grasp the folded device 20 on the side 32 to begin insertion. Next, as shown in FIG. 4, the interlabial device 20 is further inserted by pressing with a finger in the recess 62 formed by the folded backsheet 38. The recess 62 covers the tip of the wearer's finger during insertion. This feature is for hygienic insertion of the absorbent interlabial device 20 of the present invention. The wearer may take a squat posture during insertion to help spread the labia surface.

FIG. 5 shows an absorbent interlabial device 20 inserted into the interlabial space of the wearer W. FIG. The genitourinary gland shown in FIG. 5 includes the bladder (B), the vagina (V), the urethra (U), the clitoris (C), the large intestine (I), the anus (A), the vaginal inlet (VI), the hymen ring (H), The labia minora (N) and the labia majora (J). 5 shows the relationship of these anatomical features of the wearer W to the absorbent interlabial device 20 when the device is properly inserted for use. Once the absorbent interlabial device 20 is inserted, the topsheet 42 tends to contact the inner surface of the labia. When the wearer is standing, the labia wall is closer to the folded absorbent interlabial device 20.

Given the wide range of size, shape, and membrane texture of the labia, it is very difficult to design a limited number of interlabial device pad sizes that can be precisely fit for a wide range of women. To solve this problem, a new development is needed to design interlabial device base pads that can change, adapt and shape their shape in use to match the specific contour of the vulvar circle of each particular woman. do. This development needs to be combined with a robust insertion device or design (either the installer or the insertion tab), because the more flexible or conformable the basal interlabial device pad is, the more difficult it is to insert / install the interlabial device within the labia. There is.

Two practices have been considered to achieve a more consistent and deep fit for products worn in the interlabial area. First is a reinforcement tab 52 that provides completeness to the flexible pad so that the product can be pushed deeply into the labia majorum, thereby achieving close contact with the vaginal opening without wrinkling or kinks. Since the tab 52 can cause discomfort by the addition of a stronger material, folded lines / marks are added to the tab so that the tab folds without feeling worn out once inserted. The second is an external applicator with a blunt end that is thin so that it can be placed between the folds of the product and allows the product to be installed up to the vaginal opening but not to be inserted into the vagina. The installer contacts the interlabial product at the center of the product on the backsheet.

The absorbent interlabial device 20 is preferably provided with an optional insertion and / or removal tab 52 coupled to the lower side 20B of the body portion 22. The tab 52 may have any suitable size that provides a convenient finger grip during insertion and optionally removal of the interlabial product 20. In the embodiment shown in FIGS. 1-3, the tab 52 is about 20 mm long and has a height (ie, measured in the "z" -direction after attachment) about 13 mm. Tab 52 provides an element for the wearer to grasp interlabial device 20 during insertion. The absorbent interlabial device 20 is designed to be discharged by urination. However, tab 52 may also provide an alternative mechanism for removal of interlabial device 20 (ie, removal with a finger).

Enhanced insertion aids are used to install and fit the product within the labia. This feature improves the installation and fit of the product so that the flexible / compatible product can be deeply placed within the labia. Since the depth of product placement is improved by the installation device, bypass contamination will be reduced. Accordingly, the interlabial base pad is improved by more contact with the vaginal opening.

The tab 52 can be made of various materials and need not be absorbent. In one example, tab 52 may be formed of a nonwoven material that is thermally bonded to a tissue layer. A suitable nonwoven material is known as COROLIND, which is available from BBA Nonwovens, Piene, Germany, and is the same material used for the topsheet prior to mechanical deformation. Suitable airlaid tissue is available from Merfin Hygenic Products, Ltd., Delta, British Columbia, Canada, having a basis weight of about 61 g / m 2 and having designation grade number 176.

Different perspective of interlabial device

Preferably, the absorbent interlabial device 20 of the present invention is toilet bowl disposable. As used herein, the term "toilet-disposable" means that the interlabial device can be disposed of in the toilet. The interlabial device is preferably at least flushable. In a particularly preferred embodiment, the interlabial device may be provided with one or more of properties such as dispersibility, settleability, degradability and biodegradability.

As used herein, the terms "flushable" and "flushability" refer to similar problems that can obstruct commonly available domestic toilet and plumbing drainage systems or directly relate to the physical structure of the product. The ability of a product to pass through it without causing it. However, there can be many differences in the various types of variations available. Thus, for the purposes of the appended claims, a test for determining the flushing ability of menstrual products, such as interlabial absorbent devices, is described in detail in the Test Methods section of this specification.

Preferably, the absorbent interlabial device 20 of the present invention is dispersible and dispersed into at least two pieces within two hours of exposure to water at room temperature with gentle agitation as described in the water dispersion test in the Test Method section below. something to do. As measured by a water dispersion test, more preferably the absorbent interlabial device 20 is divided into a plurality of pieces within about 60 minutes, or even more preferably within about 30 minutes, and most preferably within about 15 minutes. Will be distributed. The product will be broken into pieces, each piece being preferably less than about 6 in ² , more preferably less than about 4 in ^{2 and} most preferably less than about 2 in ² . In a particularly preferred embodiment of the present invention, each component of the absorbent interlabial device 20 will disperse into multiple pieces when submerged in gently stirred water. Alternatively, the components of the absorbent interlabial device 20 may themselves be separated from one another without breaking into multiple pieces (eg, topsheet 42, backsheet 38, and core 44). ) Are decomposed with each other, but each remains intact].

"Sedimentation" refers to an absorbent interlabial device, such as sometime settling on the bottom of a septic tank or other sewage treatment system, rather than having the absorbent interlabial device 20 float on the surface of a septic tank or sewage to be treated. Say the tendency of the device.

Degradability and biodegradability can be measured according to the 20 day sludge test included in the test method portion of the present specification. Preferably, the absorbent interlabial device 20 comprises a biodegradable material. Biodegradable materials are preferred for the absorbent interlabial device 20, but any material used need not be biodegradable. For example, the device 20 may include superabsorbent particles that are not biodegradable, which does not affect the ability of the overall device 20 to maintain toilet disposal and be effectively treated in a sewage treatment system. For the total weight basis, the interlabial device 20 is preferably about 70% biodegradable, more preferably at least about 80% biodegradable, even more preferably at least about 90% biodegradable, and most Preferably about 95% biodegradable.

As shown in the fully assembled configuration, the absorbent interlabial device 20 preferably includes at least one desired bending axis A. As shown in FIG. The desired bending axis A is preferably located along the generally longitudinal center line L of the absorbent interlabial device 20. The desired bending axis A is a line or axis that is liable to bend or fold when the absorbent interlabial device 20 receives a compressive force F directed laterally inwardly at the side 32 of the device 20. The desired bending axis A may be naturally due to the product structure, or the interlabial device 20 may be any or all topsheets 42, backsheets 38 to form the desired bending axis A. ) And weakened axes or regions within core 44. Such weakened axes may be formed by any of a variety of known techniques such as scoring, prefolding, slit formation, and the like. The absorbent interlabial device 20 may include a desired bending region consisting of a plurality of desired bending axes. Any number of these axes can include up to countless of these desired bending regions.

The absorbent interlabial device 20 is folded along the desired bending axis A as shown in FIG. 4 before insertion into the interlabial space of the wearer. Once inserted, the device 20 tends to unfold slightly, and preferably maintains the topsheet 42 of the device 20 in contact with the inner wall of the wearer's labia. The interlabial device 20 may be slightly elastically biased along the preferred bending axis A to increase the tendency of the device 20 to unfold. This is the upper surface of the device, in which the folded device 20 acts as a "spring" under both wet and dry conditions and consequently remains in contact with the inner surface of the labia when the absorbent interlabial device 20 is in place. It increases the tendency of the sheet. However, the device 20 constructed in accordance with the preferred embodiment described above does not necessarily require additional structural features to provide the ability to maintain such contact.

The absorbent interlabial device described herein preferably has both flexibility and compressibility. Flexibility and compressibility are important for product comfort. If the absorbent interlabial device 20 is too flexible, the device is not conveniently or easily placed between the folds of the labia, and if too strong, the device is inconvenient and the product is clitoris when the user is sitting It may cause discomfort due to the force forward.

The absorbent interlabial device 20 (i.e., the device tapered at the end) shown in Figures 1-3 allows the device to fit easily and comfortably into the interlabial space of the wearer. The device 20 having such a tapered shape when folded along the desired bending axis A has a peak (measured in the "z" -direction) along the bending axis A rather than at the end of the device 20. It will have a contour near the center. The folded configuration of the device 20 when appropriately sized as described above allows for close coverage of the walls and vaginal inlet of the labia. This cover substantially reduces the incidence of "bypass" around the device 20 by menstruation or other body excretion, as indicated by the previous interlabial pad.

The improved product performance is also due to the construction of the absorbent interlabial device 20. As mentioned above, the likelihood of contamination of the body or clothing from excretion absorbed by the interlabial device 20 is reduced. In addition, when the interlabial device 20 is folded along the desired bending axis A, the interlabial device 20 is recessed 62 to protect the wearer's finger from contamination when the device 20 is inserted. Will form).

Absorbent interlabial devices (with or without backsheets) may be worn in conjunction with absorbent articles, such as sanitary napkins or pantyliners. In this case, the absorbent interlabial device 20 keeps the sanitary napkin or pantyliner more clean, allowing the wearer to wear the sanitary napkin and pantyliner for longer periods than usual.

Previous interlabial pads did not provide the characteristics of the interlabial device 20 shown and described herein, and thus do not yield the performance and comfort results described herein. Some previous pads consisted of small, generally cylindrical, absorbent materials that are inserted into the interlabial space. These devices are characterized by less clean insertion and removal, and can lead to increased panties and body contamination compared to the device 20 of the present invention.

Other previous pads are much larger than the devices described herein, and there are quite a few parts outside of the interlabial space. In addition, this design can increase body contamination as the excreted body effluent moves to the outer surface of such a pad. It is also contemplated that the interlabial device 20 described herein provides the advantage of comfort (e.g., reducing the feeling of wearing) over the larger pads of the prior art described above. These and other interlabial devices were not flexible enough and did not cover all of the labia at the same time when the wearer moved in a certain way (when the wearer crouched), so these devices conformed to the labia and unfolded with him. I do not lose. This makes the collection of body exudate less efficient. Another interlabial device is folded and kept in a folded form. This prevents the device from opening and closing to conform to the labia as the wearer moves.

The absorbent interlabial device 20 also better conforms to labial origin than previously available interlabial pads. In addition, the generally flat and folded configuration of the absorbent interlabial device 20 described herein provides a better visual indication to the user regarding how to insert and use the device.

Other embodiments of the interlabial device 20 are also possible. A non-limiting example of another suitable configuration of the interlabial device is U.S. Patent No. 6, dated June 9, 1998, entitled “Toilet-Disposable Absorbent Interlabial Device”. 5,762,644, the disclosure of which is incorporated herein by reference. The interlabial device disclosed in this patent may include a central absorbent portion and a pair of flexible extensions coupled to the central absorbent portion. The flexible extension preferably extends downwardly and laterally outward from the top of the main absorbent portion, and preferably maintains contact with the inner surface of the labia majora of the wearer.

The interlabial device 20 is preferably held in place at least in part by applying a slightly laterally oriented pressure on the wearer's labia minora, labia majora, or both inner surfaces. The product may also be held in place somewhat by the attraction of the labia surface, which is naturally moist with the material comprising the topsheet 42. Optionally, any suitable portion of the interlabial device, such as the interlabial device 20, or at least one body contacting surface of the interlabial device, may assist in placing the interlabial device in place at a desired location in the interlabial space. It can have a substance thereon. Preferably, the material should comfortably hold the interlabial device 20 in contact with the inner side of the labia majora, or alternatively the inner side of the labia majora, or both the labia minora and the labia majora, whereby the wearer opens the labia. The device is held in contact with these surfaces (on both sides of the interlabial space) that are not assisted by the wearer's panties when moving in (eg, when the wearer spreads his feet across the width of the shoulders). The topsheet can be attached by a material to a part of the wearer's body tissue, but the topside still must maintain the stretch / adjustability of the wearer's body movement and movement. This allows the interlabial device 20 to remain in place during the wearing state, and also when the wearer is pissing, the stream of urine contacts and is removed during pissing, or is easily removed by, for example, wiping with toilet paper. Will be guaranteed.

Typically, the unloaded interlabial device 20 will have a weight of about 5 g or more. The need for materials to assist in keeping the interlabial device in place becomes more important as the load (ie, the weight of absorbed body drainage) expected to be retained by the interlabial device 20 increases. The absorbent interlabial device 20 may retain any suitable amount of body drainage fluid up to the absorption capacity specified above. As the weight of absorbed body excretion increases, the gravity on the loaded interlabial device increases. For this reason, it is necessary to increase the ability to hold the interlabial device 20 in place, especially when the exudation load is about 8 g or more (eg 8 g, 10 g, 12 g or 15 g). Thus, for example, if the unloaded interlabial device 20 is required to weigh 2 g and maintain 10 g of body exudate, the interlabial device 20 must remain in place under 12 gf. Also, in some instances where the interlabial device 20 is loaded, in a configuration having flexible extensions, one flexible extension is separated from the adjacent labia while the other flexible extension remains attached to the adjacent labia. There may be. This increases the risk of contaminating the wearer's underwear and / or outerwear at heavier loads due to the possibility that body exudates can move past the side of the interlabial device that is no longer in contact with the wearer's labia.

The material used to hold the interlabial device 20 in place should have sufficient strength to hold the device securely in place, particularly for naturally moist parts of the interlabial portion of the wearer's body. The material should also be a material that allows the interlabial device 20 to be removed without pain or trauma to the user. Preferably, the material for holding the interlabial device 20 in place holds the device in place under the desired load as described above, but when the wearer is urinating, the interlabial device moves from the interlabial space into the toilet. Let it drain.

Thus, the material does not need to be attached to withstand the effluent pressure of 100 cm or more from the urethra. That is, it is only required to be able to withstand the pressure between the weight of the device when loaded up to a pressure of less than about 100 cm of water pressure. [19 cm water pressure is the approximate maximum bear-down pressure for an adult female during urination]

The material for holding the interlabial device 20 in place preferably has certain additional properties. The interlabial device 20 should be easily placed in a suitable position without discomfort and also worn without irritation. It is also desirable to have biodegradability to be suitable for disposal in toilets. In addition, where the interlabial device has a flushable design, the presence of the material should not interfere with the flushing ability of the interlabial device. A preferred material for holding the interlabial device in place is one that provides separation resistance under shear force but can be removed comfortably using peeling force.

Materials for holding the interlabial device 20 in place may include materials that are typically the same as the adhesive, and materials that are generally not considered to be adhesives (ie, non-adhesive materials). Suitable adhesives include pressure sensitive adhesives and tacky non-pressure sensitive adhesive materials. Suitable pressure sensitive adhesives include silicone-based pressure sensitive adhesives such as polysiloxanes, modified polysiloxanes, hydrocolloid based adhesives, pool based adhesives, and moisture-activated adhesives.

Optionally, the interlabial device is provided with a non-adhesive material on its body contact surface to hold the interlabial device in place. The non-adhesive material may be of a type having "stickiness" (ie, stickiness) or may be of a type having no "tackiness". Suitable non-adhesive materials include waxes (microcrystalline waxes, paraffin waxes, silicone waxes, polyethylene waxes, etc.), fatty alcohols, high molecular weight alcohols, fatty acids, petroleum jelly, sealing ointments, ethoxylated alcohols. non-ionic surfactants such as alcohols, ethoxylate long chain alcohols and ethoxylate fatty acids, alkoxylate amides, alkoxylate amines, alkyl amido alkylamines, alkyl substituted Amino acids, moisture-activating substances, and compounds thereof. Other suitable non-adhesive materials include U.S. Pat.Nos. 5,085,884 and 5,422,131, and Elsen et al., Issued February 4, 1992 and June 6, 1995, respectively, to Young et al. Fat substituted OLEAN manufactured by The Proter & Gamble Company of Cincinnati, Ohio, US 5,422,131. Without being bound by any particular theory, it is believed that such materials can hold objects in place due to high viscosity or surface tension.

Moisture-activated materials are materials that initially have little or no tack (ie, feel dry), but when contacted with moisture (preferably a relatively small amount of moisture) they become viscous and tacky. Preferred moisture-activated materials for use in the present invention lose most of their tack when overflowed with excess moisture, such as when the wearer is pissing. Moisture-activated materials are particularly preferred for use with the interlabial device 20 because the interlabial device is easier to install than a pressure-sensitive or adhesive adhesive coating device because it does not adhere to the body when the product is inserted. This may be necessary when using adhesives, however, because the user does not need to open the labia and there is no risk of contaminating hands when placing the interlabial device. Moreover, moisture-activated materials do not tend to adhere and misorient to the wrong parts of the wearer's body when the product is placed between the labia, but in adhesives. In addition, these materials are particularly useful for keeping the interlabial device stationary against this portion of the wearer's body because of the natural presence of moisture. That is, these substances can be hydrated in vivo.

Some particularly preferred moisture-activating materials are polyethylene glycol ("PEG"), carboxymethylcellulose sodium [preferably USP (US Drug Grade)], alcohols, glycols such as propylene glycol [dihydric alcohols), hexylene glycol, polyols such as glycerin containing three or more hydroxyl groups, sugar alcohols and other molecules capable of hydrogen bonding in contact with the interlabial region with water , Polyoxyl alkylates [polyoxyethylene sterate], ethoxylate alcohols, sugar surfactants and sugars (glucose, fructose and sucrose), or compounds or mixtures thereof. The materials may be used alone or in combination with one another, such as in combination with polyethylene glycol, or they may be pectin, guar gum, locust bean gum, hydroxypropyl guar gum, polygluconumin gum. (polyglucomanum gum), cationic guar gum, anionic guar gum, alginate, xanthan gum or compounds or mixtures thereof, and polyhydric alcohols and combinations thereof with the compounds or mixtures.

Polyethylene glycol [HO- (CH ₂ CH ₂ -O) _n -H] (or abbreviated PEG) is the same material known as cough syrup to coat the throat of a person. Polyethylene glycol is available under the trade name CARBOXWAX from Union Carbide. PEG 200 to PEG 600 (PEG with molecular weight 200 to 600) are liquid at up to 80 ° F. (27 ° C.). PEG 900 to PEG 20,000 is solid at temperatures below 80 ° F. (27 ° C.). All of these are dissolved at least 60% in water at 20 ° C. Preferably, higher molecular weight PEG is used which is a solid phase. However, lower molecular weight PEG may be used. Polyethylene glycol can be installed on the body contacting surface of the interlabial device using any conventional processing step, which is described in more detail below. Once installed, they will typically be dried in the form of a non-tacky powder. Polyethylene glycol is water soluble so that the wearer may lose the tendency to adhere to the labia when pissing, whereby the interlabial device will be discharged by pissing as intended. In addition, their water solubility does not interfere with the ability to flush the flushable interlabial device down the toilet and ensures that it is not suspended in the toilet like some other products. (The tendency to float other products reduces the ability to push them down the toilet at the time of flushing, resulting in a very uncomfortable situation where the user has to remove these products from the toilet and discard them.) Polyethylene glycol, unlike most silicone pressure sensitive adhesives, is biodegradable.

One particularly preferred moisture-activating material comprises a mixture of 1.75 g carboxymethylcellulose sodium (USP), 0.25 g polyethylene oxide (NF) and 125 ml distilled water. If the mixture is applied only to the side of the product, the mixture is applied in a total amount of 0.15 g per interlabial device, or if the mixture should be applied to the entire body contact surface of the product, in a total amount of 0.30 g per interlabial device. It is preferable to be.

The material for holding the interlabial device 20 in place may be mixed with other materials prior to applying the material to the interlabial device. Such other material may serve as a component of the material for holding the interlabial device in place, or may serve as a carrier for the material for holding the interlabial device in place. Non-limiting examples of materials that can act in either of these ways are lotions, emollients and mineral oils. For example, the material for holding the interlabial device in place may be a polyethylene glycol blended in a lotion formulation that provides smoothness during insertion and is tacky when contacted by moisture. In another example, emollients can be used as carriers for PEG in particulate form. In another example, PEG may be liquid and may serve as a carrier for other materials. Such other materials may include, but are not limited to, spermicides.

The aforementioned materials may be applied to the body contacting surface of the interlabial product in an intermittent pattern, in a continuous pattern, or in a pattern having both continuous and intermittent portions. Applying the material in an intermittent pattern may be useful where it is desirable to minimize the material from interfering with the acquisition of liquid into the interlabial device 20, which allows the liquid into the absorbent core between the intermittent regions of the material. Because it can be transported. Applying the material in a continuous pattern may be useful when it is desirable to use a contact that causes the material to create a barrier in the wearer's body against exudation outflow over the interbody device's body contact surface. However, applying the material in a continuous pattern should not form an impermeable barrier that prevents menstrual blood or urine from being absorbed by the interlabial device 20.

The material may be applied in any suitable manner, such as by spraying, padding, using a transfer roll, or by printing such as gravure or screen printing. The material may be applied directly to the interlabial device, or may be applied to other materials or components that will be attached to the desired portion of the interlabial device.

The material may be disposed on any suitable portion of the interlabial device 20. The material may be disposed on the entire body contact surface of the interlabial device or a portion thereof. For example, the material may be disposed on all or part of the body contact surface of the body portion 22. If the interlabial device is of a type comprising a central absorbent portion and a flexible extension extending therefrom, the material may be disposed on the central absorbent portion, the flexible extension portion, or both the central absorbent portion and the flexible extension portion. Thus, the material may be disposed on the central region of the interlabial device 20 and not on the periphery of the interlabial device. More preferably, however, it may be placed on the periphery of the body contact surface of the interlabial device, but not in the central region. Positioning the material in the latter manner may be advantageous if the material is desired to minimize any tendency to hinder the acquisition of body excretion into the interlabial device 20. The material may also be used to form a seal to prevent the flow of exudate towards the end (and / or side) of the device. The material may cover any of the following proportions of the surface area of the body contact surface of the body portion 22, the central absorbent portion, the flexible extension, or the entire body contact surface of the interlabial device: 5%, 10%, 20%. , 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100% (about this ratio)

The material may be applied to the interlabial device 20 in any suitable amount. For these purposes, the amount of material applied to the interlabial device 20 will be expressed in terms of the total weight of the product comprising the device and the weight of the material. The material is preferably about 20% or less, more preferably about 10% or less, most preferably less than about 5% of the total weight of the product, so as not to contribute excessively to the total weight of the interlabial device. This allows more than the total weight of the product to contribute to providing the absorbent capacity.

Many specific embodiments of the interlabial device are possible with various materials thereon to assist in keeping the interlabial device in place at a desired location in the interlabial space. The interlabial device may be applied to one or more materials described herein in any application pattern described herein.

For example, the body portion 22 of the interlabial device having the configuration shown in FIGS. 1-3, or the flexible extension of the interlabial device disclosed in the patent, incorporated herein by reference, has an inner surface of the wearer's labia. A biocompatible adhesive may be provided to assist in adhesion of that portion of the interlabial device to the labia. The strength of this adhesive should be chosen to keep the absorbent interlabial device 20 in place, but still help to reliably and comfortably remove it from the wearer's interlabial space. Examples of suitable adhesives are commercially available hydrocolloid or hydrogel adhesives, and acrylic adhesives.

In another embodiment, the interlabial device 20 may be provided with one of the materials described herein around the perimeter of the body contacting surface of the interlabial device to assist in maintaining the device in place adjacent the wearer's labia. have. The material may be applied in a continuous or intermittent pattern, or in a partially continuous and partially intermittent pattern. The swelling absorbent material may be disposed inside the area defined by the material. If full sealing with the wearer's body is desired, this swelling absorbent material eliminates any gaps or void spaces that may occur adjacent to the wearer's body that may occur due to misplacement of the interlabial device relative to the wearer's body. It can be used to create a self sealing device. Some non-limiting examples of swelling absorbent materials include, but are not limited to, superabsorbent hydrogel forming materials, absorbent foam materials, modified cross-linked cellulosic fibers, and compressed absorbent materials such as those used in tampons.

14 shows an embodiment in which the topsheet 42 has a number of floors and valleys therein. In the embodiment shown in FIG. 14, a material for keeping the topsheet 42 in contact with the wearer's body is located on at least a portion of the floor on the body contacting surface of the topsheet 42. However, the bone is preferably substantially free of material for keeping the topsheet 42 in contact with the wearer's body. The material for holding the interlabial device in place will be applied only to the floor so that a portion of the topsheet having the material thereon will remain in contact with the wearer's body, and the portion of the topsheet between the floors will be subject to movement of the wearer's body. It will be stretchable to conform. As in the case of other embodiments shown and described herein, this embodiment of the body contact topsheet can be used for any product that can be placed in contact with the wearer's body and is limited to use on interlabial devices only. It doesn't work.

Many other embodiments and characteristics of the material for holding the interlabial device in place are also possible. For example, the materials described herein preferably have a moisture vapor transmission rate sufficient to maintain the natural state of hydration of the labia tissue. Suitable moisture vapor delivery rates are up to about 300 gm m / hour at relative humidity differences of 10% to 100%. In addition, any of the materials described herein, by Dia, dated March 11, 1997, have the name “Diaper with a lotion valine topsheet comprising a liquid polyol polyester emollient and antifreeze agent. Having a Lotioned Topsheet Comprising a Liquid Polyol Polyester Emollient and an Immobilizing Agent, "US Pat. No. 5,609,587 and July 1, 1997, issued to Rowe et al. a Lotioned Topsheet, "US Pat. No. 5,643,588, or may be used in combination with, or in combination with, emollients.

In addition to various embodiments of material for holding the interlabial device 20 in place as described herein, the interlabial device may be provided with other optional features. For example, it has been found that the interlabial device of the present invention provides a significant benefit to the user in controlling the odor associated with body exudate. Additional odor control agents can be added to further reduce the odor. Such odor control agents are activated charcoal, zeolite, silica, polyacrylic acid (super absorbent), certain quaternary compounds, triethyl citrate, cyclodextrin, or any Include but are not limited to compounds. Particularly preferred cyclodextrin compounds are disclosed in US Pat. No. 5,429,628 to Trihn et al. And US Pat. No. 5,780,020 to Peterson et al. In addition, deodorants may be added to further block these odors.

In addition, over-the-counter vaginal drug actives, which can be purchased at pharmacies without prescription, provide cleanliness, provide a sweet and refreshing effect, deodorize, reduce minor inflammation, reduce the number of pathogens, and grow normal vaginal flora. It may be added for one or more of the purposes of changing the pH to promote, producing an astringent effect, lowering the surface tension, producing a mucolytic effect, or producing a proteolytic effect. Quality medications available at the pharmacy without these prescriptions include calcium propionate, dioctyl sodium sulfosuccinate, nonoxynol 9, octoxynol 9, and potassium sorbate. sorbate, povidone-iodine (PVP-iodine), sodium lauryl sulfate, and sodium propionate.

In these or other embodiments, some of the products or components thereof described herein, such as interlabial device 20, assist in the ability to comfortably hold the product in place when force is applied to the product during wear. It may be made of an extensible and / or extensible material. However, it is particularly desirable to form the interlabial device or portion thereof from an extensible and / or extensible material when the material is applied to the interlabial device to help maintain the interlabial device in place in the interlabial space. Do. For example, where the interlabial device has a portion attached to the labia, it is desirable to have some extensibility to enhance comfort and reduce the likelihood of irritation. Specifically, it is preferable not to limit the movement of the wearer's labia when the wearer's body moves. Suitable extensible materials that may be used in the components or other products of the interlabial device described herein are those issued to Osborne et al. On March 18, 1997, and entitled "Stretchable Absorbent Articles". US Pat. No. 5,611,790.

The absorbent interlabial device 20 may be worn as a "stand alone" product. In addition, excellent performance in reducing contamination of the body and clothing over long periods of wear can be achieved by using an absorbent interlabial device as part of the "system" of feminine hygiene products. One such system that is effective in reducing contamination is an absorbent interlabial device, such as an absorbent interlabial device 20 that is worn simultaneously with a sanitary napkin, such as sanitary napkin 74 (shown in FIG. 15).

Such systems of interlabial devices in combination with sanitary napkins are more effective than sanitary napkins or interlabial pads that are worn alone. The absorbent interlabial device used in such a system may have all the desirable properties of the absorbent interlabial device 20 described above, and preferably have all the properties. Sanitary napkin 74 may be any suitable conventional sanitary napkin. The sanitary napkin 74 includes a liquid permeable topsheet 76, a liquid impermeable backsheet 78 coupled to the topsheet, and an absorbent core 80 positioned between the topsheet 76 and the backsheet 78. It is preferable to include at least. In addition, the sanitary napkin 74 preferably includes a pressure sensitive adhesive 80 disposed on the side of the backsheet 74 facing the garment. Adhesive 84 allows sanitary napkin 74 to adhere to the crotch portion of the wearer's underwear. When the underwear is worn in its normal wear position, the sanitary napkin 74 will be placed adjacent to the vulva region of the wearer's body. In addition, sanitary napkin 74 may be provided with additional features that normally appear on a sanitary napkin including a "wing" or "flap", such as wing 82. Suitable sanitary napkins for use in the systems described above are U.S. Pat. "ALWAYS" Ultra Thin Maxi with Wings Sanitary Napkin manufactured and packaged by Procter & Gamble Company, Cincinnati, Ohio, according to US Pat. No. 5,704,930, and reissued US Pat. No. 32,649.

To use the absorbent interlabial device and sanitary napkin as a system of feminine hygiene products, the wearer inserts the absorbent interlabial device into the interlabial space and places the sanitary napkin in the crotch portion of the panty-type underwear. These two steps may be performed in any order. Some women prefer to place sanitary napkins in the panty crotch first to receive and absorb menstrual outflow droplets that may be drained before the absorbent interlabial device can be inserted. Another woman chooses to insert an absorbent interlabial device first. After the absorbent interlabial device is inserted and the sanitary napkin is placed in the underwear crotch, the underwear is usually pulled up to the wearing position. As a result, the sanitary napkin is placed adjacent to the vulva region of the wearer's body and will be worn simultaneously with the absorbent interlabial device.

Preferably, the absorbent interlabial device used with the system described above is replaced each time the wearer is urinating. The combined sanitary napkin can be worn for a longer period of time (more than a replacement of the absorbent interlabial device) because the bulk of the body effluent is deposited and absorbed on the interlabial device as compared to the sanitary napkin. In particular, in the case where the absorbent interlabial device 20 is provided with a removal tab 52, some women have removed the absorbent interlabial device 20 before pissing and continue to remove it if they have not yet been absorbed close to its total capacity. Preference is given to reinserting the same device 20. Also, if the woman does not want to dispose of the interlabial device by flushing it down the toilet, the tab 52 provides a hygienic way for the woman to remove and discard the product.

The sanitary napkin and absorbent interlabial device of the system described above may be packaged in a common packaging container as a feminine hygiene "kit." Such a set of articles facilitates the use of the system of the present invention. Preferably, the packaging associated with this set of articles includes instructions for use of the absorbent interlabial device and sanitary napkin according to the method described above as a system of feminine hygiene products.

Suitable modification systems of feminine hygiene products include an absorbent interlabial device 20 used concurrently with an absorbent tampon, such as tampon 86 shown in FIG. The absorbent tampons of this system of feminine hygiene products can be any suitable conventional menstrual tampons, including tampons distributed by The Procter & Gamble Company, Cincinnati, Ohio, and sold under the trade name "TAMPAX". Tampons used may be of either the installer insert or the digital insert type, and any suitable installer known in the art may be used. Tampons are first inserted into the vaginal cavity of the wearer. Following insertion of the tampon, the absorbent interlabial device is inserted into the interlabial space of the wearer. The interlabial device and tampon are worn simultaneously during the menstrual period. The absorbent interlabial device may be removed and replaced each time the wearer is urinating, or may be reinserted following urination after removal.

Similarly, the absorbent tampon and absorbent interlabial device 20 of such a system may be packaged in a common packaging container as a set of feminine hygiene products. Such a set of articles facilitates the use of the deformation system described herein.

In addition, the system and associated article set of the present invention may include simultaneous use of absorbent interlabial devices, tampons, and sanitary napkins. A set of articles containing all three types of feminine hygiene products may be packaged in a common packaging container and includes appropriate instructions for use of such a system.

The invention may also include a set of articles comprising any combination of oral contraceptives, infusion contraceptives, hormone replacement therapy, interlabial devices, tampons and sanitary napkins.

In addition to the system described above, the absorbent interlabial device 20 may be worn simultaneously with a pantyliner or menstrual or incontinence pads. The absorbent interlabial device 20 described above may be packaged in combination with a pantyliner, incontinence pad, or sanitary napkin to form a set of women's incontinence supplies. This set of incontinence articles preferably includes suitable packages that explain to the wearer how to use the feminine hygiene product for mild incontinence protection. The interlabial device 20 may be worn in conventional panties or may be used with menstrual shorts.

Moreover, there are many variations of absorbent interlabial devices. For example, these products are designed to be removed by pissing, however alternative extraction lines and loops may be used. In addition, these products may be used in combination with emollients and / or medical treatments. For example, the composition of an emollient suitable for use in an absorbent interlabial device is about 50% petrolatum (such as White Protopet 1S manufactured by Witco corp.) And about 35% cetearyl alcohol ( Mixed linear C ₁₆ -C ₁₈ primary alcohol manufactured under the trade name TA 1618 by The Procter & Gamble Company, and about 15% Cetereth-10 manufactured by BASF. An emollient coating of about 0.03 g / pad is known to be suitable.

The absorbent interlabial device 20 may be provided with a visible indicator on the centerline of the topsheet 42 that indicates the region of the largest absorbing capacity of the device 20. Such a display portion may be composed of regions painted in different colors, such as pink ellipses. The display portion may be about 12 mm wide and about 20 mm long. In addition, the absorbent interlabial device 20 may be provided with a visual change indication. That is, the interlabial device 20 may include a ring, a bonding pattern, a compression line, or other visible display device provided on the surface of the top sheet 42 at a predetermined distance inward from the seam 60. When the absorbed body waste reaches the visible exchange indicator or the outside of the exchange indicator, the user knows that the absorbent interlabial device 20 needs to be replaced. This replacement indicator is particularly useful for a user who reinserts the same device 20 after removing the device 20 before pissing when the interlabial device 20 has not yet reached its absorption capacity.

If desired, the absorbent interlabial device 20 may be packaged in a separate packaging. Individual packaging can be composed of a number of suitable materials including films and toilet disposable materials. In one embodiment, the packaging can be made of a film that is vulnerable to sealing at the edges. The packaging container may have an opening tab that may have any suitable shape. Suitable methods for fragile sealed packaging are disclosed in US Pat. No. 4,556,146 to Swanson and US Pat. No. 5,462,166 to Minton et al. Suitable tabs for such packaging are disclosed in US Pat. No. 5,413,568 to Roach et al.

The materials described herein, as well as other features and components, can also be applied to other types of absorbent articles, including, but not limited to, diapers, sanitary napkins, tampons, incontinence devices, panty liners, and bandages.

(Test Methods)

For all test methods other than L bend, V bend, and kill stiffness tests, standard experimental climate control (73 ° F. or 23 ° C. ± 1 ° C., 50% relative humidity) as specified by T402 om-93, TAPPI in section 3. ± 2%) should be used. All samples should be acclimatized to these conditions for at least 2 hours prior to measurement. The test shall be carried out under similar conditions.

Critical surface tension of the material

To achieve the object of the present invention, the hydrophilicity or hydrophobicity of a material must be determined by measuring the critical surface tension of the material. Critical surface tension is measured by applying a series of liquids of known surface tension to a material to observe the wet behavior. The critical surface tension of the material should be measured using the ASTM method (ASTM D 2578-94) for measuring the wet tension of polymer films. This method will likewise test the nonwoven material.

Below are examples of critical surface tensions for some materials of interest.

Material critical surface tension (dynes / cm)

COROLOND 29-30

BIONELLE 40

Top sheet compressibility (thickness change)

This test procedure measures the topsheet caliper change under pressure. This procedure can be used to calculate topsheet compressibility (and density) as a function of two applied pressure loads. These pressures may symbolize those found in the labia vestibule while wearing the absorbent pad in interlabial space. However, this procedure is intended to be used to test topsheet material whenever topsheet compressibility is listed in the appended claims, and is not limited to testing topsheets used only for interlabial products.

sampling:

The sample should be cut to be larger than the 40 mm diameter round foot used to compress the sample. A square cutting die 10 cm x 10 cm was provided to ensure that the edge effect associated with good working and unrecoverable sample compression does not occur. The area to be tested should be able to lay flat (preferably with a flatness of less than 0.05 mm). However, the structure of the topsheet should not be changed to flatten the sample. The sample may be cut from the raw roll or the final product, but the cut area should be free of wrinkles or bends and should exhibit the correct dimensions of the topsheet material. The topsheet layer should be able to be clear from other materials. At least three different samples should be measured and the average result recorded.

For topsheet samples removed from the final product, and if the sample dimensions are not large enough to be measured as described above, a smaller diameter circular foot needs to be selected. The use of smaller diameter circular feet is acceptable if the applied pressure is maintained as described below and provided to avoid irregular edges or material damage associated with topsheet removal. If a foot of smaller diameter is used, at least five samples should be measured to ensure that representative measurements of the topsheet surface are obtained. Allow the topsheet to be carefully removed without altering its surface structure.

Device:

This test procedure requires a precision (± 0.01 mm or less) thickness gauge such as the One-Sokki GS-503 gauge available from One-Sokki Technology, Inc., Addison, Illinois, with replaceable circular foot. Ideally, the thickness gauge is attached to a digital readout module such as One-Sokki Model DG-3610. Smooth polished granite blocks (Rock of Ages Surface Plate, Barre, Vermont, USA) to ensure that no significant irregularities (otherwise causing measurement errors) are present on the surface to be sampled and measured. Supplied and ground to at least 0.001 mm plan view] or equivalent should be used as the measurement surface.

Circular Measurement Foot:

Diameter of flat round foot = 40.0 mm ± 0.5 mm and weight of 10 g selected

Full weight (foot + caliper shaft) = 32 g ± 1 g

Initial measurement pressure = 250 N / m 2 (2.55 g / cm 2 or 0.036 psi)

Additional weight attached to the shaft = 100 g ± 1 g

Final Weight (Foot + Extra Weight + Shaft) = 132g ± 1g

Final measured pressure = 1000 N / m 2 (10.5 g / cm 2 or 0.149 psi)

Test procedure:

① Before starting the measurement, calibrate the caliper gauge using a standard gauge so that the precision is ± 0.01mm.

(2) Place the sample face up on the polished granite surface, and the caliper shaft and foot assembly unit are centered over the tested sample. Start the test with a standard circular foot (40 mm) and a total shaft + foot weight of 32 g.

③ Gently lower the caliper shaft and the foot assembly onto the sample, wait 5 seconds (but 10 seconds or less), and record the initial sample thickness to 0.01 mm of significant figures. This corresponds to a thickness under a pressure of 250 N / m 2 (2.55 g / cm 2 or 0.036 psi).

④ With the sample still positioned under the circular foot, carefully place an additional weight disc (100 g) on the caliper shaft (now with a total weight of 132 g), wait 5 seconds (but no more than 10 seconds) before final Record the sample thickness. This corresponds to a thickness under a pressure of 1000 N / m 2 (10.5 g / cm 2 or 0.149 psi).

⑤ The caliper change of the top sheet is determined by subtracting the final caliper from the initial caliper (see the following formula).

Calculation:

As a result of the compressive force, the caliper change of the topsheet is

Top sheet caliper change = Caliper (at 250 N / m2)-Caliper (1000 N / m2)

Determined by

The larger the topsheet caliper change value, the better the topsheet will be able to compress and conform to the compressive force during wear of the absorbent device without directly sending the compressive force on the sensitive membrane of the wearer's body.

Elongation test of top sheet for small force

This test procedure measures the extensibility of the topsheet at small stretch forces.

This procedure is based on ASTM methods D 5035-95 and D 117-97a. The measurement of the extensibility (expressed as a function of% elongation) of the topsheet in the cross machining direction or in the machining direction is measured using these standard methods applied in accordance with the characteristic details below.

sampling:

Representative samples should be cut 25 mm (± 0.1 mm) wide and 100 mm long from the topsheet material using an appropriate cutting die. These samples will be tested according to the "strip test" defined in ASTM D5035-95. The strip sample can be cut from the raw roll or the final product, but the cut area must be free of wrinkles or bends (eg from the raw roll) and must exhibit the correct dimensions of the topsheet material. At least three different samples should be measured and the average result recorded. The sample taken from the product should be free of wrinkles, tears, holes, or other defects, but the natural surface state of the sample (eg, corrugations, etc.) should not be changed (eg by pulling it tight).

Device:

The INSTRON Model 5564 Tensile Tester, available from Insrton Corporation, Canton, Mass., Is used for these tests. Instron tensile tester is interfaced to a PC running on the WINDOWS 98® operating system, and MTS Test Works 4.0 TM software (Sampling Rate) is a data acquisition program available from Sintech, Inc. of Research Triangle Park, NC, USA. Up to 400 Hz). High speed data collection rates are important for precise measurements because the measured material is potentially stretchable at small applied forces. The instrument setup parameters used to measure the extensibility (expressed as% elongation at 50 g load) of the topsheet are as follows.

① Sample clamp with a jaw of 25 mm.

② The sample gauge length (separation length of the clamp at the start of the measurement) is 50mm, and if a smaller sample is used, the gauge length may be 25mm.

③ Crosshead speed is 50mm / min.

④ 10N load cell is used.

⑤ The data acquisition rate is 400 Hz (400 data points / second).

Test procedure:

① Ensure that the Instron or equivalent tensile tester is correctly calibrated according to the manufacturer's setup and maintenance procedures before starting the measurement.

② The sample shall be prepared according to the principle of ASTM 5035-95 and cut into strips 25mm ± 0.5mm wide and 100mm ± 10mm long. Strips are obtained that are aligned in both the machining direction and the cross-machining direction of the topsheet material web. If a sample is taken from the product, several products are required, one strip aligned in the longitudinal direction of the product to be tested, and one strip aligned in the width direction. In the case where a sample is taken from the product, smaller sample sizes will be acceptable if a strip of dimensions of at least 25 mm ± 0.5 mm in width and 35 mm ± 0.5 mm in length is provided. In this case, the gauge length needs to be selected to 25 mm.

③ Gently insert the sample into the Instron Jaw Clamp located on a 50 mm gauge. The sample is correctly aligned vertically and parallel to the stretching direction and centered in the clamp without creases and kinks. Force at start to be recorded as zero or close to it. If the value exceeds 1 g, the sample is repositioned in the sample retention clamp.

The tensile tester is operated to begin recording the force as a function of the material elongation, and the test ends automatically at the break point of the topsheet.

The measured values are recorded for the stretchability of the topsheet in the machining direction as well as in the cross machining direction.

(4) The extensibility of the topsheet (expressed as% elongation at 50 gf) is determined by analysis of the recorded data as described in detail (see formula below).

Calculation:

The extensibility of the topsheet at 50 gf is determined from the data set. Given the high extensibility of these materials, it is important to avoid the irregularities associated with the sample established at the start of the test. Samples should be handled to the minimum. It should be mounted on a clamp that has no tension or has a very small amount of slack. To further minimize irregularities, consider all data points corresponding to a force of less than 5 g as slack. At a load of 5 g, the gauge gap is considered zero point.

% Topsheet Elongation (MD or CD) × 100% = [Sample Length (at 50g) -Slack Length (at 5g)] / Slack Length (at 5g)

The larger this value, the better the topsheet can deform with the movement of the wearer's body without directing the shear force on the sensitive body film.

Surface roughness

The surface properties of the range of nonwoven and film topsheets (roughness, ie the contact area of the topsheet as a function of depth / caliper) were determined according to the manufacturer's procedure as set out in detail in the user's guide. Zygo Corporation, Middlefield, Connecticut).

Equipment setup parameters: 2.5X Michelson objective with a zoom factor of 0.5X, Zygo Focus white light filter element, normal resolution data collection (320 × 240 data points), minimum modulation% set to 1, and 7 The Minimum Area Size set to is used for these analyzes. The scan length was set to 800 um to 1600 um to suit the surface condition of the sample.

Frequency Domain Analysis was set to perform the calculation in the low mode.

In addition, the data was processed using a five point average low pass filter to remove non-significant surface noise. To accommodate larger fields of view, Zygo MetroPro v7.3.2.3.1 with a matrix of 10% overlap between the 4x5 (settings used for the selfie COROLIND sample) and 3x4 (settings used for the rayon) analysis Automatically merged with each other using software (final total analysis area was 21.53 mm × 20.07 mm (self-corroded) or 16.29 mm × 16.15 mm (rayon)).

Estimates of the surface contact area of each topsheet with other surfaces were calculated from the surface profile at a series of depths (calipers). To minimize the impact of frequency surface noise on this analysis, the data was filtered / processed with an 11 point average low pass filter. A cylinder function was used to remove any slight total curvature of the sample due to the mounting procedure. The resulting surface was analyzed by the MetroPro Bearing Plot routine. Using this Bearing Plot's Inspector tool, the percentage of surface area contacted at a depth of 100 microns or 1000 microns from the first surface contact point was measured. This data is plotted (surface contact area in% of sample profile depth in microns).

Absorption capacity

The absorption capacity may be determined as follows. The test is performed on samples adjusted by placing them in a room at 50% relative humidity and 73 ° F. for about 2 hours prior to testing. This test shall be carried out under similar conditions.

Weigh the product to 0.1 g of significant figures. The product is then immersed in a beaker containing 0.9% sterile saline solution, available from Baxter Travenol Company, Deerfield, Ill. Do not The product is locked for 10 minutes. The product is removed from the salt solution and placed horizontally on a wire mesh screen with a square opening of 0.25 inch by 0.25 inch (0.64 cm by 0.64 cm) for 5 minutes to allow salt to drain from the product. Both sides of the product are covered with an absorbent blotter, such as filter paper # 631, available from Eaton-Dikeman Division of Filtration Science Corp., Mount Holly Springs, PA. A uniform 1 pound / in ² (6.9 Pa) load is placed on the product to squeeze out excess fluid. Replace the absorbing blotter at 30 second intervals until the amount of fluid delivered to the absorbing blotter is less than 0.5 g per 30 second period. The product is then weighed to 0.1 g significant figure and the dry weight of the product is subtracted. This gram count difference is the absorption capacity of the product.

Water dispersion test

Device

Shaker Lab Line Instruments, Melrose Park, Illinois, USA

Junior Orbit Shaker available from

30 ° F to 120 ° F divided by thermometer 1 ° F

Timer digital stopwatch

Bottle with lid 16 oz glass bottle with lid

Test setup

① Fill the vial with 300 ml of tap water at 73 ± 3 ° F.

② Set the speed for Junior Orbit Shaker to 250rpm according to the manufacturer's instructions.

Test procedure

① Hold the sample (eg, the absorbent interlabial device 20) at 3 inches to 4 inches (7.6 cm to 10.2 cm) above the surface of the bottle. The sample is gently lowered to the surface.

② Place the lid on the bottle.

③ Place the bottle into the Junior Orbit Shaker so that the bottle is oriented on its side.

④ Start Junior Orbit Shaker with on / off switch and start timer when shaker is on.

⑤ Record the time it takes for the sample to separate into at least two pieces. Separation does not include the cleavage of several individual fibers from other complete samples.

⑥ Repeat steps 1 to 5 with three additional samples.

Calculation and record

Calculate and record the mean and standard deviation of the water dispersibility time for the four samples tested.

Washing ability test

survey

As noted above, the term “washable or flushable” refers to the ability of a product to pass through a typical commercially available household toilet and plumbing drainage system without causing blockages or similar problems that can be directly associated with the physical properties of the product. Say. In order to achieve the object of the appended claims, the ability to flush the product is assessed by the relative ease of toilet and trap (U-pipe) discharge and subsequent movement through the simulated piping system. The flushing capacity of such devices shall be measured by the following test procedure.

A family of four (two men and two women) design the test procedure by simulating normal toilet use for two days. The test uses a flushing sequence that simulates the following conditions: male urination, female urination (including later wiping with tissue), product by wiping with tissue (ie, interlabial device under test). Or other device), and the act of defecation. The amount of tissue to be used for each tissue wash is the usual loading of two strips of seven. Conventional loading is based on consumer research on typical habits and habits. The test is designed to simulate the conditions encountered when the product is flushed through a municipal toilet into a municipal sewer or septic tank. Samples are evaluated for (1) clearance of toilets and traps, (2) blockage of drain lines, and (3) disintegration during flushing.

Device

A device suitable for the water washing test is shown in the plan view of FIG. This device includes:

* 3.5 gallon (13.2 L) water-saving siphon vortex toilet indicated by reference numeral 210 (in addition to the piping layout shown in FIG. 17 to evaluate the behavior of the test sample using a different flush mechanism such as a commercial pressure toilet). May be attached),

Acrylic pipe 4 inches (10 cm) inside and approximately 59 feet (18 meters) long (as can be seen from FIG. 17, the tubing has linear lengths 211, 213, 215 approximately 10 feet (3 meters) in length). , Assembled into a nearly square shape with 217, 219, 221],

* Cast iron T-tubes slightly downstream of the toilet 210 which is open to the atmosphere for exhaust,

5 90 degree cast iron elbows (212, 214, 216, 218, 220),

A snag 222 (Fig. 18) located vertically about 15 feet from the end of the pipe and approximately 1 inch (2.5 cm) in length,

Screen to capture solid effluent to assess degradation (Tile 4 sieve).

The device used in this method is installed to be equivalent to ANSI standard A112.19.2M-1990 for the Vitreous China Fixture. This pipe is piped to provide a drop of 0.25 inch (2 cm / m) per foot of pipe length.

material

Tissue products used for testing: Standard "CHARMIN" toilet paper manufactured by The Procter & Gamble Company, Cincinnati, Ohio, USA.

Artificial stool material: Prepared according to the method described below.

Test flush sequence

The test flush sequence simulates normal toilet use for two days (two men, two women; based on consumer habits and habits survey). A total of 34 wash sequences include 14 washes of empty toilet, 8 washes only on tissues, 6 washes on tissues and products under test, 6 washes on tissues and simulated fecal matter (SFM). It consists of washing twice. If SFM is used, the SFM is introduced just before loading the tissue. The SFM loading of 160 g ± 5 g consists of two 1 inch (2.5 cm) x 4 inch (10 cm) pieces and one 1 inch (2.5 cm) x 2 inch (5 cm) pieces. Folded tissue strips (or menstrual products) are introduced into the toilet at 10 second intervals. After 10 seconds of putting the final strip or product into the toilet, flush the toilet. The flush sequence is described below as a series of two routines combined in the following order.

Routine # 1 (performed first six times for a total of 30 washes)

① Wash tissue only-After the water reaches the simulated obstacle, take a drain line blockage for 2 minutes, wait an additional minute, then go to step 2.

② flush the empty toilet-take a drain line blockage for 2 minutes after the water reaches the snag point and go to step 3.

③ Wash tissue and products-After the water reaches the snag point, take the drain line blockage for 2 minutes, wait an additional minute, then go to step 4.

(4) Flush the empty toilet bowl.-After the water reaches the snag point, take the drain line blockage for 2 minutes and go to step 5.

⑤ Wash tissue and simulated fecal material (SFM)-After the water reaches the snag point, take a drain line block for 2 minutes and wait an additional minute.

Routine # 2 (performed once)

① Wash tissue only—Take off the drain line for 2 minutes after the water reaches the snag point, wait another minute, then go to step 2.

② flush the empty toilet-take a drain line blockage for 2 minutes after the water reaches the snag point and go to step 3.

③ Wash tissue only—Take off the drain line for 2 minutes after the water reaches the snag point, wait an additional minute, then go to step 4.

④ Flush the empty toilet-Take a drain line blockage for 2 minutes after the water reaches the snag point.

The total number of washings performed per sequence is 34 times.

After the second flush in the flush sequence, if the product remains in the toilet or trap after flushing, the tissue and / or product is manually pushed into the drain line and the flush sequence continues. After completion of each test loading, the drain pipe is washed before the start of subsequent tests.

The above flush sequence is repeated three times for each test product.

Data record

The degree of drainage line blockade is determined by measuring the length of the water behind the obstacle. A mark is made every 12 inches (30 cm) on the drain pipe upstream of the obstacle. Each one foot of water retracted corresponds to 6.25% or 0.25 inch (0.6 cm) of blockage at the obstacle point. Test product residues from the drains are also collected.

Record the following data for each evaluation.

① Incidence rate of product failure in cleaning toilets and traps with a single flush

② Incidence of product failure in cleaning toilets and traps with two flushes (%)

③ Incidence rate of product on simulated snag

④ Maximum level of drainage line blockage (%)

Cumulative level of drainage line blockage over 2 days of simulated test period.

The products described herein are preferably at least about 70% at two or more washes, more preferably at least about 80% at one wash, even more preferably at least about 90% at one wash, most preferably Will thoroughly clean the toilet to at least about 95% in a single wash. It is preferred that the articles described herein have a maximum level of drain line blockade of about 80% or less. The products described herein preferably have a cumulative level of drain line blockade of less than about 50% over a simulated test period of two days.

Preparation of artificial stool material

I. Materials needed

Feclone artificial stool material (900 grams), available as a product BFPS-7 dry concentrate from Siliclone Studio, Valley Foze, Pennsylvania, USA

* 100 ℃ tap water (6066g)

II. Necessary equipment

Mixer (available as model A200 from Hobart Corp., Troy, Ohio, USA)

Extruder (commercially available as model 4812 from Hobart Corp., Troy, Ohio, USA)

Disposable centrifuge tube (50 ml) with screw cap (available as catalog number 21-008-176 from VWR Scientific, Chicago, Illinois, USA)

* Water bath to control the temperature to 37 ℃

III. Ready

① Pour water at 100 ° C. into the mixing vessel of the mixer and add the dry peclone concentrate.

② Mix at low speed for 1 minute.

③ Mix at medium speed for 2 minutes.

④ After mixing the materials, transfer them to the extruder.

⑤ Drill a small hole in the tip of each centrifuge tube using an ice pick.

⑥ Extrude the peclon into the centrifuge tube.

⑦ Cover the centrifuge tube and store it in the freezer.

⑧ Put tube into 38 ℃ water bath before use.

28 days sludge test

purpose:

To determine the extent to which absorbent products degrade upon exposure to biologically active anaerobic sludge. Anaerobic conditions are commonly found in municipal sewage treatment facilities in the form of anaerobic sludge digesters, as well as household decay tanks. Test products, such as absorbent products, are mixed with anaerobic warmer sludge to measure the extent and rate of degradation of the test product over a 28-day period. Degradation (measured by weight change) is usually measured on specific irradiation days of 3 days, 7 days, 14 days, 21 days and 28 days. This protocol was developed after the International Protocol of the National Sanitation Foundation, Ann Arbor, Michigan, USA: Evaluation of the Anaerobic Disintegration of a Test Product in November 1992.

material:

Contrast standard product

TAMPAX regular brand tampons will be used as a positive control standard for anaerobic digestion testing.

Material preparation

Before the test and control standard product is placed in the reaction apparatus, the material is dried in a hot air oven at 103 ° C. ± 2 ° C. for 2 hours and then weighed to determine the initial weight. Approximately equivalent weights of control standard and test product are placed in each reaction device.

Anaerobic Sludge:

The sludge used for this evaluation is anaerobic sludge obtained from municipal wastewater treatment plant, or untreated sewage obtained as inflow sewage from concentrated wastewater treatment plant by standing still by precipitating water at the top. Prior to use in the evaluation, the following parameters of the sludge are measured according to standard experimental operating procedures.

-Total solids

-Total volatile solids

pH

The sludge must meet the following criteria for use in this assessment.

pH 6.5-8

-Total solids 15,000mg / L or more

-10,000 mg or more total volatile solids

The criterion for the activity of the sludge requires the control standard tampon material to lose at least 95% of its initial dry weight after 28 days of exposure.

Test procedure:

Test and control standard products are placed in a 2 L wide mouse glass flask (reactor) containing 1500 ml anaerobic warmer sludge or concentrated untreated sewage. Prepare three reactor flasks per test material per sampling date. Thus, measured on days 3, 7, 14, 21 and 28, there are a total of 15 flasks for the test product and a total of 15 flasks for the control standard product. The reaction apparatus is placed sealed in an incubator maintained at 35 ° C ± 2 ° C. At the designated sampling date, each of the three reaction units for the test and control standard materials is withdrawn from the incubator. On the designated sampling date, the contents of each reactor were passed through a 1 mm mesh screen to recover all undissolved material. The collected material is rinsed in tap water to remove it from the screen and placed in a hot air oven at 103 ° C. ± 2 ° C. for at least 2 hours. Weigh the dried material to determine the final weight. Furthermore, when recovered from the reaction apparatus, visual observation of the physical appearance of the material is performed and recorded.

result:

The rate and extent of anaerobic digestion of each of the test material and the control standard material is determined from the initial dry weight of the material and the dry weight of the material recovered at the sampling date. The rate of anaerobic degradation is determined using the following formula.

Decomposition Ratio (% Weight Loss) = (Initial Dry Weight-Final Dry Weight) × 100 / (Initial Dry Weight)

For each sampling date, the average rate of degradation for the test and control products is provided. For the purposes of the appended claims, the degradation rate values are examined for 28 days.

The disclosures of all patents, patent applications (also registered patents and published corresponding foreign patent applications) and publications mentioned throughout this specification are incorporated herein by reference. However, it is evident that all of the documents cited by reference herein do not present or disclose the present invention.

While specific embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

V bending test of final product

A. Vertical Bend

The V bending test method of the final product evaluates the longitudinal stiffness of the product designed to be inserted into the interlabial vestibule of a woman for the purpose of absorbing and containing body excretion. A key aspect that results in good effluent acceptance and contamination performance is the precise placement of interlabial products within the labia vestibule and specifically close enough to the vaginal opening to prevent bypass contamination. These tests measure the product's resistance to bending into the labia vestibular during insertion and installation of the product and conforming to the particular labia structure. The greater the product's resistance to bending and deformation during installation, the less product is inserted, the less installed it is to the depth required for optimal management of excreted body effluents, and the less bypassing the absorbent structure. You can prevent it. This method is a measure of the "beam stiffness" of the interlabial product along its centerline.

purpose:

It measures the resistance of the interlabial product to deformation along the longitudinal centerline during the installation process. Evaluate the interlabial product's ability to conform to the wearer's anatomical shape (longitudinal centerline) during installation and insertion of the product.

Equipment setting:

① crosshead speed = 500mm / min

② Crosshead travel distance = 25mm when compressed

③ data rate = 400 Hz

④ The upper assembly consists of a light duty grip that uses 1 inch by 1 inch rubber coated surface

⑤ Lower 3-point bend assembly uses two 5 mm (diameter) stainless steel roller supports (MTS model number 642.01A)

⑥ Lower assembly is set to 75mm span

⑦ The gauge length (measured in the plane formed by the upper side of the two stainless steel rollers and the lower side of the upper grip surface) is set to 15 mm

⑧ Indoor climate conditions should be controlled by TAPPI standard (25 ℃, 50% humidity)

Test Conduct:

As shown in FIG. 24, the test sample pad 300 is placed in the lightweight air grip 301 and centered between the lower three point bending assembly (MTS 642.014) 302.

25, the lower edge of the test sample pad 300 is aligned with the lower edge of the rubber side grip of the lower three point bending assembly (MTS 642.014) 302 before operating the lightweight air grip 301. (Once the grip is activated, the product may swell slightly).

record:

① Peak Load: The peak load that occurs while bending the pad across a 75 mm span. It is important that the peak load is calculated before any pad compression occurs.

② “bending stiffness”: This is the magnitude of the slope of the initial linear portion of the stress-strain curve, reported in kPa. The formula is

"Bending Stiffness" = (Tilt x Gauge Length) / Area

* Slope = peak slope that occurs between any two points containing 50% of the stress-strain curve

* Gauge Length = 15mm

* Area = 645.16㎡ (1in ² )

* Gauge lengths and areas generally apply in tensile testing, but for our purposes we use these values to equalize the comparison between samples. What we want is the slope of the initial linear portion of each stress-strain curve. More directly, we can just use the slope, but historically we calculated the modulus-like amount to get the gauge length and cross-sectional area constants.

B. "Free" vertical bending

Free V bending uses the same protocol as V bending except for the following.

1. As shown in Figs. 26 and 27, the test sample pad 301 is held by the kill, and the side of the pad 301 is free.

General test run:

I. Products characterized by an external insertion device (with a kill or insertion aid)

① Carefully remove the interlabial product from any protective packaging and carefully place the product on the test surface without bending or other deformation.

② Allow the product to equilibrate for 30 minutes before making any measurements.

③ Measure and record the physical characteristics of the product such as length, width and thickness.

④ Select a new non-deformed sample and fix the product in the mounting clamp jaw as normally performed by the product user holding the product before insertion / installation. Carefully position and center the product on the test device. In this case, the product is expected to be secured by an external handle / grip / kill or other attachment means including a disposal or regeneration insert device. If no external grip or device is present, proceed to step II-① below.

5 The test is started and the force is recorded by the data recording software as a function of the crosshead position (as the crosshead traverses the programmed distance).

⑥ The peak force (g resistance) in which the product is deformed is measured as the slope of the line (modulus in Kpa) versus the distance traveled.

7. Repeat the test on several samples to ensure a reliable estimate of the product's resistance to deformation during installation.

II. Products without external grasping means or insertion aids

① Measure and record the physical characteristics of the product such as length, width and thickness.

② Secure the product in the mounting clamp jaw by selecting a new non-deformed sample as normally performed by the product user holding the product before insertion / installation. Carefully position and center the product on the test device. In this case, the product is expected to be held by holding the absorbent body in addition to the external attachment means.

③ The test is started, and the force is recorded by the data recording software as a function of the crosshead position (as the crosshead traverses the programmed distance).

(4) The peak force (g resistance) that deforms the product is measured as the slope of the line (modulus in Kpa) versus the distance traveled.

5. Repeat the test on several samples to ensure a reliable estimate of the product's resistance to deformation during installation.

Test results and conclusions:

The measured peak force corresponds to the product's resistance to deformation during the simulated insertion / installation process. The smaller the measured peak force (in g), the less resistance the woman encounters during the installation process, and the easier the product user achieves deep and successful product insertion / installation. For products characterized by an external insertion device (with a kill or insertion aid attached) , ideally the peak force is less than 40 g, more preferably less than 30 g and most preferably less than 20 g. For products that are not characterized by an external insertion device (with a kill or insertion aid attached) , ideally the peak force is less than 50 g, more preferably less than 40 g and most preferably less than 30 g. These numbers are directionally larger due to the fact that the absorbent core structure is usually tight and that such clamping imparts some degree of resistance to the structure during testing.

L bending of the final product

The L bending test method of the final product assesses the overall stiffness of the product that is inserted into the interlabial vestibule of a woman for the purpose of absorbing and containing body excretion. The main aspects that result in good effluent acceptance and contamination performance and overall product comfort are the correct placement of interlabial products within the labia vestibule, the product's ability to conform to the labia surface contour (structure / shape), and the labia, including physical movement. It is the ability of a product to adapt its shape as the vestibular shape changes. This test measures the product's resistance to deformation / bending along its lateral (crosswise) centerline as found during wear of the product in use. This is particularly important if the longitudinal length of the interlabial product exceeds the longitudinal length of the labia vestibule, as measured between pre and post drills. The greater the product's resistance to bending / deformation while worn, the more uncomfortable the product will be perceived. In addition, the smaller the product bends / deforms about this centerline, the greater the likelihood of contamination, because the product is less likely to conform to the labia shape, and body excretion has the opportunity to bypass the product during physical exercise. .

purpose:

The resistance of the interlabial product to deformation along the transverse centerline during the installation process is measured. To assess the potential of interlabial products to adapt to changes in anatomical shape during physical exercise.

Equipment setting:

As shown in Figs. 28 and 29, the L bending test method uses the same equipment settings as the V bending except for the following.

(1) In the arrangement of the air grips, the L bending uses a third 5mm stainless steel roller 305 (forms a true three-point bending test). The upper stainless roller 305 should be located at the center of the lower assembly span and be parallel to it.

(2) The gauge length of 15 mm is measured from the lower side of the upper roller to the plane formed by the upper side of the lower roller.

③ The lower assembly span 302 is set to 25 mm.

(4) A test sample pad 305 is placed on the side on the lower assembly, with the kill centered on a 25 mm span. If the kill is significantly off center of the product, the test sample pad 305 should be discarded.

Excessively thick pads should not be tested by this method, which is intended to measure beam stiffness rather than the force required to compress the sample. Since the bottom span is only 25 mm, very thick pads produce high forces from the force required to "fill" the pads into the 25 mm gap, not from rigidity.

Test Conduct:

① Carefully remove the interlabial product from any protective packaging and carefully place the product on the test surface without bending or other deformation.

② Allow the product to equilibrate for 30 minutes before making any measurements.

③ Measure and record the physical characteristics of the product such as length, width and thickness.

④ Select a new unstrained sample and carefully center the product on its side on the support jaw and below the displacement rod (15 mm).

5 The test is started and the force is recorded by the data recording software as a function of the crosshead position (as the crosshead traverses the programmed distance). This force corresponds to the force required to deform the product transversely along its centerline.

⑥ The peak force (g resistance) in which the product is deformed is measured as the slope of the line (modulus in Kpa) versus the distance traveled.

7. Repeat the test on several samples to ensure a reliable estimate of the product's resistance to deformation during installation.

Test results and conclusions:

The measured "peak force" corresponds to the product's resistance to bending / deformation and compliance during simulated bending motions. The smaller the peak force measured in g, the smaller the resistance will be and the female will have improved wearing comfort during physical exercise. Ideally, the peak force should be less than 200 g, more preferably less than 140 g and most preferably less than 90 g. In addition to the peak force, the product may need to be bent / twisted and compliant during physical exercise, and the product may twist the surrounding tissue as the product bends / twists or conforms as a result of physical exercise. The smaller the stiffness against bending of the product, the smaller the surrounding tissue twists, and the product exerts less pressure on these tissues. Ideally, the "bending stiffness" of the product is less than 5 kPa, more preferably less than 3 kPa, most preferably less than 2 kPa.

Kill Insertion Stiffness Test of Final Product

The kill insertion stiffness test method of the final product assesses the overall stiffness of the product that is inserted into the interlabial vestibule of a woman for the purpose of absorbing and containing body excretion. A key aspect that results in good effluent acceptance and contamination performance is the precise placement depth of interlabial products into the labia vestibule. Ideally, the product is placed at a depth sufficient to capture body waste when the body waste exits the body (introitus or urethra). This is facilitated by the product being easily bent during insertion / installation of the product and providing a minimum resistance (see V bending test above) and also preferably combined with a control member such as a grip / handle / kill or insertion aid. . The outwardly (or inwardly) installing control member is generally stiffer than other product elements to facilitate insertion / installation control. By limiting these dimensions (length, width, height), insertion control can be achieved without causing inconvenience to the product wearer from the larger rigid control member. This test measures the stiffness of an insertion control member installed outwardly (or inwardly), and the insertion control member is designed to remain attached to the product for the entire wearing period after insertion / installation of the product. Removable or disposable installation aids are not evaluated in these tests because they require that the comfort conditions of the product be met only during the insertion / installation phase and not while wearing.

purpose:

The rigidity of the attached insertion / installation control member is measured. To evaluate the likelihood of a control member for facilitating installation or causing inconvenience.

Equipment setting:

As shown in Figures 30 and 31, the kill stiffness test method uses the same equipment settings as the V bend except for the following.

The air grip (1 inch x 1 inch, rubber side) 306 holds about 5 mm of the test sample 307 of the kill.

The gauge length is adjusted for each sample so that the bottom of the sample 307 (holded by the kill) floats directly above the horizontal platen 308. For the calculation, the software still has to use a gauge length of 15 mm.

③ The crosshead is set to move at 100 mm / min to the 7 mm extension point.

(4) Care must be taken to ensure that the pad 307 itself is not compressed between the grip 306 and the platen 308 (Kilman must be compressed).

Test Conduct:

① Carefully remove the interlabial product from any protective packaging and carefully place the product on the test surface without bending or other deformation.

② Allow the product to equilibrate for 30 minutes before making any measurements.

③ Measure and record the physical characteristics of the product such as length, width and thickness.

④ Select a new unstrained sample and carefully place the product on its top surface to expose the attached kill or control member.

(5) Position the kill or attached member so that it is centered within the jaws of the test rig, so that an attachment member of approximately 5 mm is held in the jaws of the rig.

⑥ Suspend the product so that it is located directly above the lower measuring plate of the instrument (see FIGS.

⑦ This test is started and the force is recorded by the data recording software as a function of the crosshead position (as the crosshead traverses the programmed distance and compresses the product through the kill). This force corresponds to the force required to deform the product transversely along its centerline.

⑧ The peak force (g resistance) that transforms the product is measured as the slope of the line (modulus in Kpa) versus the distance traveled. This force corresponds to the force required to deform the product and the kill or control member during compression (ie, sitting), or the resistance required to deform the kill structure during insertion / installation of the product.

9 Repeat the test on several samples to ensure a reliable estimate of the product's resistance to deformation during installation.

Test results and conclusions:

The measured “kill stiffness” is a measure of the resistance of the kill structure (at the point of attachment of the product) to bending or deformation in the compressed state (eg, sitting) during insertion / installation or while wearing the product. Ideally, for the insertion phase of product installation, greater "kill stiffness" is desirable to ensure maximum control and reproducibility of product placement in the labia vestibule. However, the kill or control member on the product may have excessive stiffness when actually wearing the product, which may cause discomfort to stab during some body position, such as sitting or twisting legs. Typically, the kill or control member protrudes above the folded product height in use. While sitting, the tissues in the labia are compressed. Too strong a kill or control member resists compression and transmits this compression force excessively on the labia tissue and surface and prevents the product from intermittently blocking the product against the labia vestibular wall. In the kill stiffness test method, the kill (or control member) stiffness is preferably greater than 10 g and less than 60 g, more preferably greater than 20 g and less than 40 g, most preferably 30 g to 40 g. In addition to peak forces, it is also important how the product deforms during physical exercise.

When using detachable or disposable insertion aids, a rigidity of more than 20 g, preferably more than 30 g and most preferably more than 40 g, may be selected for this test design to ensure proper product fit during the insertion / installation phase. To ensure control.

Claims (64)

A body tissue-contacting topsheet for an absorbent article disposed in contact with a wearer's functional body tissue, The topsheet includes a web having a body contacting surface and an opposing bottom side, wherein the topsheet has a plurality of floors and valleys and is located on the floor on the body contacting surface of the topsheet. Has a substance for attaching to body tissues of the bone, the bone is absent of the substance, Non-absorbent material having at least 30% elongation in one or more directions under a force of 50 g and subject to a caliper change of at least 30% when tested according to the thickness change test Body tissue-contact topsheet. The method of claim 1, Having a critical surface tension of less than 45 dynes / cm Body tissue-contact topsheet. delete The method of claim 1, The body contact surface has regions of varying heights, a plane may be disposed adjacent to the highest point of the body contact surface, the topsheet has a depth, and 300 microns from the plane passing through the highest point of the body contact surface. The amount of surface area of the topsheet lying on the plane passing through the topsheet at a depth below is no greater than 15% of the surface area of the topsheet as defined by the bearing ratio. Body tissue-contact topsheet. The method of claim 3, wherein The amount of surface area lying on the plane passing through the topsheet at a depth below 400 microns from the plane passing through the highest point of the body contact surface is 40% or less. Body tissue-contact topsheet. delete delete The method of claim 5, A nonwoven web having a plurality of corrugations Body tissue-contact topsheet. Insertable into the interlabial space of a female wearer comprising the body tissue-contacting topsheet of claim 1 Absorbent device. The method of claim 4, wherein Further comprising an acquisition zone having one or more openings Body tissue-contact topsheet. Claim 1 comprising the body tissue-contacting topsheet tampon. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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