JP2010125199A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which is made optimally wearable to every location of a body shape to have improved wearability and leak prevention characteristics. <P>SOLUTION: An absorbent body 4 is divided into four ranges of: a range I positioned on the center part in the width direction of a sanitary napkin 1 including at least a blood outlet H; a range II positioned on both side parts of the range I; a range III positioned on front and rear parts of the ranges I, II; and a range IV positioned between the range III and an front and rear end parts. The absorbent body 4 in the ranges I, II, III is formed in almost uniform thickness and rigidity in those ranges is in a relative relation; range I>range IV>range II, range III. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides an absorbent article such as a sanitary napkin, panty liner, incontinence pad, etc. for absorbing menstrual blood or vaginal discharge. The present invention relates to an absorbent article for prevention.

  Conventionally, as absorbent articles such as panty liners, sanitary napkins, and incontinence pads, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene laminated nonwoven fabric, and a liquid-permeable top sheet such as a nonwoven fabric or a liquid-permeable plastic sheet; There is known an intervening absorbent body made of cotton-like pulp or the like.

  Numerous improvements have been made to this type of absorbent article, and various means have been taken to bring the surface of the absorbent article into close contact with the body in order to prevent leakage of bodily fluids.

  For example, in Patent Document 1 below, since the vaginal facing area can be reliably adhered to the vaginal opening, the thickness dimension of the vaginal facing area located on the longitudinal center line of the liquid absorbing layer is on both the left and right sides of the vaginal facing area A sanitary napkin that is set larger than the thickness dimension of the located side region is disclosed.

Further, in the following Patent Document 2, in order to easily maintain the close contact between the main absorption region and the excretory part of the body when receiving a compressive force from the lateral direction, the main absorption region located on the vertical center line, It has a buffer area located on both the left and right sides of the absorbent area, and a side reinforcement area that is positioned on both the left and right sides of the buffer area and extends in the vertical direction. An absorbent article is disclosed that is in the region and where the main absorbent region> buffer region.
JP 2006-230596 A JP 2006-346303 A

  However, in the sanitary napkin described in Patent Document 1, the thickness dimension of the vagina facing area is set larger than the thickness dimension of the side areas located on both sides, but the vagina facing area is different depending on the shape of the body. Leakage occurred without close contact, and the thickness was so thick that it felt uncomfortable.

  In order to prevent a sense of incongruity and liquid leakage due to twisting, fit the body part optimally by following the valley in the buttocks and along the body curve in front of the blood outlet. This is very important.

  Further, in the absorbent article described in Patent Document 2, since the bending rigidity of the side reinforcement regions on both sides is set to be large, it is easy to feel the hardness around the legs, causing skin troubles due to rubbing, etc. There was a risk of damage.

  Then, the main subject of this invention is providing the absorbent article which aimed at the improvement of wearability and leakage prevention by making it fit optimally with the shape of a body for every part of the body.

In order to solve the above-mentioned problem, as the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet,
The absorbent body is a region I located at the center in the width direction of the absorbent article including at least a blood drainage port, a region II located on both sides of this region I, and a front and rear portion of these regions I and II. It is defined in each of the region III located and the region IV located from each region III to the front and rear ends,
The absorbers of the regions I, II, and III are formed to have substantially the same thickness, and the absorbers of the respective regions have a relative relationship of region I> region IV> region II, region III. An absorbent article characterized by the above is provided.

  In the first aspect of the present invention, since the absorbers in the regions I to III including the blood drainage port are formed to have substantially the same thickness, they are optimal for body shapes in the vicinity of the blood drainage port that are different for each person. It is possible to improve the wearability of the absorbent article and prevent leakage.

  Further, in the vicinity of the blood drainage port, the absorber in the region I is formed with higher rigidity than the absorbers in other regions. This is to prevent twisting and twisting due to leg pressure in the region I including the blood drainage port. For this reason, the deformation | transformation by compression or a twist is suppressed, and, thereby, improvement of mounting property and prevention of a leak can be aimed at. The “rigidity” refers to compression rigidity in the thickness direction and torsional rigidity in the torsion direction, and these rigidity satisfy the relative relationship.

  Here, since the absorber of region II located on both sides near the blood drainage port is formed with lower rigidity than other parts, the absorber of region II is easily deformed, which Can reduce the sense of discomfort, and can reduce skin problems caused by rubbing the base of the legs.

  On the other hand, in the region III in the front part and rear part from the vicinity of the blood drainage port part, it is formed with low rigidity so that it can be easily deformed along the shape of the body. Specifically, in the buttocks on the back side from the vicinity of the blood drainage port, the absorber of the region III located at the rear of the regions I and II is formed with low rigidity. It becomes easy to deform | transform along a valley, and it becomes possible to aim at the improvement of mounting property and prevention of leakage.

  Also, in the region from the vicinity of the blood drainage port to the lower abdomen on the front side, the absorber of the region III located in the front of the regions I and II is also formed with low rigidity, so it curves forward and backward of the body It becomes easy to deform | transform along the shape to carry out, and, thereby, improvement of mounting property and prevention of leak come to be aimed at.

On the other hand, the absorber in the region IV located at the front and rear end portions of the absorber is formed with higher rigidity than the absorbers in the regions II and III. This is because the absorbers at the front and rear ends are more rigid because they are more likely to be deformed by compression or twist than the absorbers at the intermediate part.
According to a second aspect of the present invention, there is provided the first aspect of the present invention, wherein the absorber in each region satisfies the relative relationship of rigidity by forming the density in a relationship of region I> region IV> region II, region III. An absorbent article is provided.

  In the invention according to the second aspect, in order to obtain an absorber satisfying the relative relationship of rigidity, the density of the absorber in each region is formed by the relationship of region I> region IV> region II, region III. It is a thing. The relative relationship between the compression stiffness in the thickness direction and the torsional stiffness in the torsional direction can be satisfied by forming the absorber density in each region with the above relationship.

  As the present invention according to claim 3, there is provided the absorbent article according to any one of claims 1 and 2, wherein the absorbent in the region I is formed with a relatively high basis weight than the absorbent in other regions. The

  In the third aspect of the invention, since the absorber in the region I is formed with higher rigidity than the absorbers in the regions II and III, the absorber in the region I has a higher basis weight than the absorbers in other regions. Forming.

  As the present invention according to claim 4, there is provided the absorbent article according to any one of claims 1 to 3, wherein the absorber in the region IV is formed with a relatively thinner thickness than the absorber in other regions. The

  In the invention of claim 4 above, in order to form the absorber in region IV with higher rigidity than the absorber in other regions, the absorber in region IV is formed with a relatively thinner thickness than the absorber in other regions. ing. By forming the absorber at the front and rear end portions with a thickness thinner than other regions, the uncomfortable feeling of mokomoko can be eliminated.

  As the present invention according to claim 5, a plurality of dot-shaped embosses are formed in the absorbers of the regions I and IV, and the embossing interval of the region I is formed relatively larger than the embossing interval of the region IV. An absorbent article according to any one of claims 1 to 4 is provided.

  In the invention described in claim 5, a plurality of dot-shaped embosses are formed in order to increase the rigidity of the absorbers in the regions I and IV. At this time, when the basis weight of the absorber in the region I is high, the embossing interval in the region I is set to be relatively larger than the embossing interval in the region IV so as not to become too hard after the embossing is added.

  As described above in detail, according to the present invention, it is possible to provide an absorbent article that improves wearability and prevents leakage by optimally fitting the body shape for each body part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention, and FIG. 2 is a view taken along the line XX of FIG.

  The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable front sheet 3 that allows permeation of menstrual blood, cages, and the like, and a space between the two sheets 2 and 3. An absorbent body 4 made of cotton-like pulp or synthetic pulp intervening in the sheet, crepe paper 5 surrounding the absorbent body 4 for maintaining the shape and improving the diffusibility of the absorbent body 4, and longitudinally on both sides of the surface. It is comprised from the side nonwoven fabrics 7 and 7 formed along the direction. Around the absorber 4, at the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 that extend laterally from the absorbent body 4 at both side edges thereof are bonded to each other by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, a flap portion F where the absorber 4 does not exist is formed on the outer periphery.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

  Further, synthetic fibers may be mixed in the absorbent body 4. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like. In particular, in the present invention, as described in detail later, one of the purposes is to reduce the uncomfortable feeling when the napkin is attached, and therefore the thickness of the absorbent body 4 should be in the range of about 0.5 to 2 mm. Preferably, the manufacturing method of the absorbent body 4 is preferably a piled pulp or an airlaid absorbent body so as to be rich in flexibility.

  On the other hand, side non-woven fabrics 7 and 7 are provided on both sides of the sanitary napkin 1 along the longitudinal direction and almost the entire length of the napkin 1, respectively. Wing-like flaps W, W are formed by a part of the liquid-impervious back sheet 2 that extends sideways and also extends sideways.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic It is desirable to use a hydrophilic treated non-woven fabric provided with.

  In the present invention, in particular, the absorbent body 4 includes a region I located at the center in the width direction of the sanitary napkin 1 including at least the blood drainage port H, regions II located on both sides of the region I, and these regions. The region III is located in the front and rear portions of the region I and the region II, and the region IV is located from the region III to the front and rear ends. In the illustrated example, in the region III, the region III-1 is located at the rear of the regions I and II, and the region III-2 is located at the front.

  When the sanitary napkin 1 is worn, the regions I and II correspond to the crotch portion including the blood drainage port H of the wearer, and the region III-1 corresponds to the region including the groove of the wearer's buttocks, The region III-2 corresponds to a region including the lower abdomen in front of the wearer's crotch.

  The absorbers of the region I, the region II, and the region III are formed with a substantially uniform thickness. Here, the “substantially uniform thickness” may be a thickness that allows the surface height of each region I, II, III to be substantially equal in the product state of the sanitary napkin 1. Even when the embossed concave groove is formed from the surface side, it is only necessary that the surface not affected by the embossing is formed with substantially the same height.

  Furthermore, the absorber 4 in each of the regions I to IV has a relative relationship of region I> region IV> region II and region III. Here, the “rigidity” can be evaluated by the compression rigidity in the thickness direction and the torsional rigidity in the torsion direction, and both satisfy the relative relationship of the rigidity.

  Here, in order to satisfy the relative relationship of rigidity, it is only necessary that the density of the absorber 4 in each region is formed by the relationship of region I> region IV> region II and region III.

  In order to form the density of the absorbent body 4 in the above relationship, in the manufacturing process of the absorbent body 4, when the pulverized pulp is piled, the pile quantity in the region I is adjusted by adjusting the pile quantity. After three-dimensionally spreading so as to be higher than the region, the absorbers in the regions I to III are compressed to a substantially uniform thickness, and the absorber in the region IV is compressed to a lower thickness. Thereby, the density of each region is formed in the relationship of region I> region IV> region II, region III. The weight of the area I is preferably 1.5 to 3.0 times the weight of the other area. The absorbent body 4 may be compressed in a state surrounded by the crepe paper 5 after fiber stacking.

More specifically, the absorber 4 in each region is preferably formed with a density in the range shown in Table 1 below, for example. Such a density range is achieved by adjusting the basis weight and thickness of each region to the ranges shown in Table 1. That is, as shown in Table 1, the absorber 4 in the region I (weight per unit area 450 to 550 g / m ² ) is relatively larger than the absorber 4 in the other regions II to IV (per unit weight 200 to 300 g / m ² ). Formed with high weight. Further, the absorber 4 (thickness 3 to 5 mm) in the region IV is formed with a relatively thinner thickness than the absorber 4 (thickness 5 to 7 mm) in the other regions I to III.

  Next, the effect by the above-mentioned structure is explained in full detail based on FIGS.

  First, by forming the absorber 4 in the regions I to III including the blood drainage port H to have an almost uniform thickness, the body 4 near the blood drainage port H is optimally fitted to each person, The mounting property of the sanitary napkin 1 can be improved and leakage can be prevented.

  Further, as shown in FIG. 3, in the vicinity of the blood drainage port H, the rigidity of the absorber 4 in the region I defined in the central portion is the rigidity of the absorber 4 in the region II defined in both sides. Since it is set to be larger, it is possible to prevent twisting and wrinkling generated in the region I due to the compression force from the base portion of the leg, and it is possible to improve wearability and prevent leakage.

  Here, as shown in FIG. 3, the region II on both sides is easy to deform because the rigidity of the absorber 4 is set low, and the discomfort around the leg is reduced, and the base part of the leg is reduced. Skin troubles caused by rubbing will be reduced.

  On the other hand, as shown in FIG. 4, since the rigidity of the absorbent body 4 in the region III-1 is set low in the heel part behind the crotch part, it is easy to deform along the groove of the buttock part and is easy to wear. Improvement and leakage prevention can be achieved.

  Furthermore, as shown in FIG. 5, in the region from the crotch part to the front lower abdomen, the rigidity of the absorber in the region III-2 is set low, so that it deforms along the curve in the front-rear direction of the body. It is easy to improve wearability and prevent leakage.

  In the region IV defined at the front and rear end portions of the absorbent body 4, bending is likely to occur, so that the region 4 is formed with higher rigidity than the absorbent bodies in the regions II and III. Further, in this region IV, if the absorber has a thickness, a sense of incongruity with Mokomoko is generated. Therefore, the region IV is formed thinner than the absorbers in the regions I to III.

  In addition, as an index for evaluating the rigidity in the thickness direction of the absorber of each region I to IV, a compression energy value WC by a KES compression tester can be adopted, and as an index for evaluating the torsional rigidity in the torsion direction, A torsion resistance energy value B measured with a KES torsion tester can also be adopted.

  In order to further increase the rigidity of the absorber 4 in the regions I and IV, a plurality of dot-shaped embosses 10, 10,... At this time, since the absorbent body 4 in the region I is formed with a high basis weight as described above, there is a possibility that the surface becomes hard due to the emboss addition, and there is a possibility that the wearing feeling and the fitting property are deteriorated. It is desirable to make the embossing interval relatively larger than the embossing interval of region IV.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. FIG. 2 is a view taken along line XX in FIG. 1. It is the AA arrow directional view of FIG. 1 in the mounting state of the sanitary napkin 1. FIG. It is the BB line arrow directional view of FIG. 1 in the mounting state of the sanitary napkin 1. FIG. It is CC arrow directional view of FIG. 1 in the mounting state of the sanitary napkin 1. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 5 ... Crepe paper, 7 ... Side nonwoven fabric, 10 ... Emboss, F ... Flap part, W ... Wing Flap

Claims (5)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet,
The absorbent body is a region I located at the center in the width direction of the absorbent article including at least a blood drainage port, a region II located on both sides of this region I, and a front and rear portion of these regions I and II. It is defined in each of the region III located and the region IV located from each region III to the front and rear ends,
The absorbers of the regions I, II, and III are formed to have substantially the same thickness, and the absorbers of the respective regions have a relative relationship of region I> region IV> region II, region III. An absorbent article characterized by the above.   2. The absorbent article according to claim 1, wherein the absorbent body in each region satisfies the relative relationship of rigidity by forming a density in a relationship of region I> region IV> region II and region III.   The absorbent article according to any one of claims 1 and 2, wherein the absorbent in the region I is formed with a relatively high weight per unit area than the absorbent in other regions.   The absorbent article according to any one of claims 1 to 3, wherein the absorber in the region IV is formed with a relatively thinner thickness than the absorber in other regions.   A plurality of dot-shaped embosses are formed on the absorbers of the regions I and IV, and the embossing interval of the region I is formed relatively larger than the embossing interval of the region IV. Absorbent article according to crab.

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