JP4761987B2 - Body fluid absorbent article - Google Patents

Description

The present invention relates disposable diapers and sanitary napkins, incontinence pads, the body fluid absorbent article such as an absorbent pad.

As this kind of bodily fluid absorber, there is a material composed of a fiber assembly and a granular absorbent polymer mixed in the fiber assembly. This type of body fluid absorber is commercially available, for example, as a body fluid absorbent article such as a paper diaper or sanitary napkin by being interposed between the top sheet and the back sheet.
Conventionally, a fiber assembly made of fluffy pulp has been widely used as the fiber assembly. However, in recent years, a fiber assembly made of a string-like spread bundle obtained by opening a tow (fiber bundle) or the like (hereinafter also simply referred to as “fiber assembly made of tow”) has been used. It has started (for example, refer to Patent Document 1).
Thus, when making a fiber assembly into a fiber assembly which consists of a tow | toe, an open bundle is arrange | positioned so that the extension direction (it is also the extension direction of the fiber which comprises a tow | toe) may become one direction. Thus, a fiber assembly is obtained. This fiber assembly is made into a body fluid absorber by mixing an absorbent polymer as necessary. This bodily fluid absorber is arranged so that the extending direction of the spread bundle (fibers constituting the tow) is the front-rear direction of the bodily fluid absorbent article to obtain a bodily fluid absorbent article.
Since the body fluid absorbent body and body fluid absorbent article thus formed have a large void volume of the fiber assembly made of tow, the body fluid retention is excellent. However, the body fluid has a characteristic that the diffusion rate is remarkably fast in the extending direction of the fibers constituting the tow. Therefore, in the conventional bodily fluid absorber and bodily fluid absorbent article in which the spread direction of the spread bundle is one direction, there is a possibility that front and back leakage may occur at the initial stage of excretion of the bodily fluid.
JP 2005-515020 A

The main object of the present invention is to provide, while excellent in body fluid retention, no possibility of causing the front and rear leakage even when excretion initial fluid is to provide a body fluid absorbent article.

  The present invention that has solved this problem is as follows.

[Invention of Claim 1 ]
The body fluid absorbent is a body fluid absorbent article that is interposed between the top sheet and the back sheet ,
The bodily fluid absorber comprises a fiber assembly composed of a string-like spread bundle obtained by opening a tow as a constituent material, and
The body fluid-absorbing article , wherein the fiber assembly is formed by winding the spread bundle into a figure 8 in plan view .

[Invention of Claim 2]
The bodily fluid absorbent article according to claim 1, wherein an absorbent polymer is mixed in the fiber assembly.

According to the present invention , a bodily fluid-absorbing article that is excellent in bodily fluid retention and that does not cause leakage before and after the bodily fluid excretion is early.

The following body fluid absorbent article illustrating a case of "fastening tape type disposable diaper" as an example.

[Shape of paper diapers, etc.]
As shown in FIGS. 1 and 2, the paper diaper 10 of this embodiment includes a body fluid permeable top sheet 1, a body fluid impermeable back sheet 2, and a body fluid interposed between the top sheet 1 and the back sheet 2. Absorbing element 3, and so on.

  The top sheet 1 and the back sheet 2 have the same shape as the planar outer shape of the disposable diaper 10, and the front and rear end portions and both side portions extend forward and rearward or laterally from the front and rear end edges or both side edges of the body fluid absorbing element 3. ing. The lateral extension of the topsheet 1 and the backsheet 2 is particularly long at the front and rear ends. For example, a fastening material such as a fastening tape (not shown) can be attached to this long extended portion (hereinafter also simply referred to as “extended portion”).

  Further, the top sheet 1 and the back sheet 2 are joined at the extending portion. The bonding method is not particularly limited. For example, hot melt bonding, ultrasonic sealing, heat sealing (thermal fusion), heat pressing (thermocompression bonding), or a combination thereof can be used. FIG. 2 shows a form bonded by hot melt H2.

  On the other hand, the body fluid absorbing element 3 mainly includes a body fluid absorber 4 and a covering sheet 5 that covers the body fluid absorber 4. As shown in FIG. 1, the body fluid absorbing element 3 has a substantially hourglass shape with a narrow central portion in the front-rear direction. The body fluid absorber 4 is held in shape by the covering sheet 5.

  The bodily fluid absorber 4 uses a fiber assembly made of a string-shaped spread bundle obtained by opening a tow as a constituent material. And it is preferable that the spread direction is set so that the extension direction may not become one direction. If the extending direction is not set to one direction, the arrival of the body fluid at the end of the body fluid absorber 4 at the initial stage of excretion is delayed. Therefore, the body fluid is completely absorbed by the body fluid absorber 4 before reaching the edge of the body fluid absorber 4, and there is no possibility of leakage before and after.

The form in which the extending direction of the opening繊束is not a one-way below.

(First form)
As shown in FIG. 3 , in the first embodiment , for example, three spread bundles 7A, 7B and 7C are knitted in a braid shape so that the extension direction of the spread bundle does not become one direction. It is what has been. According to this form, there exists an advantage that the shape retainability of the bodily fluid absorber 4 improves.
In this embodiment, the spread bundle group 7 composed of the spread bundles 7A, 7B, and 7C is collected into a fiber aggregate by collecting one, two, three, four, or more. . And the bodily fluid absorber 4 is formed by mixing an absorptive polymer into this fiber assembly as needed.

(Second form)
The second embodiment, as shown in FIG. 4, in which the open繊束7D are wound in plan view a spiral (coil-shaped), as the extending direction of the opening繊束is not a one-way There is . According to this embodiment, there is an advantage that the body fluid diffusion speed in all directions such as the front-rear direction and the width direction becomes uniform.
In this embodiment, the spread bundle 7D is gathered into a fiber assembly by collecting one, two, three, four or more. And the bodily fluid absorber 4 is formed by mixing an absorptive polymer into this fiber assembly as needed.

(Third form)
As shown in FIG. 5 , the third form is bent so that the spread bundle 7 </ b> E has an intersection P, or is arranged so that two or more spread bundles have the intersection P. Te, in which the extending direction of the opening繊束is to avoid unidirectional. This form has the advantage that it is easy to manufacture because work such as weaving is not required.
In this embodiment, the spread bundle 7E is gathered into a fiber assembly by collecting one, two, three, four, or more. And the bodily fluid absorber 4 is formed by mixing an absorptive polymer into this fiber assembly as needed.

(4th form)
In the fourth embodiment, as shown in FIG. 6, the spread bundles 7F, 7F,... Extending in the front-rear direction (up and down direction on the paper surface) and the spread bundles 7G, 7G,. a plurality of open繊束consisting are knitted mesh with one in which the extending direction of the opening繊束is to avoid unidirectional. According to this embodiment, there is an advantage that the shape retention of the body fluid absorber 4 is improved, and the body fluid absorption speed can be adjusted by adjusting the size (area) of the meshes Q, Q. There are also advantages.
In this embodiment as well, a knitted fiber bundle 7F, 7G,..., One, two, three, four or more are collected into a fiber assembly, and this fiber assembly is necessary. The body fluid absorber 4 can also be formed by mixing an absorptive polymer in accordance with the above. However, from the viewpoint of shape retention, it is preferable to increase the number of the spread bundles 7F, 7G... And to form the fiber assembly by one knitting the spread bundles 7F, 7G.

  On the other hand, the covering sheet 5 is wound around the surface, one side surface, the back surface, the other side surface, and the surface of the body fluid absorber 4 in this order, for example, so that the covering sheet 5 is conventionally used. So-called forehead). In the case of this form, the forehead winding of the cover sheet 5 is performed so that an overlap portion (a portion where one end portion and the other end portion of the cover sheet 5 overlap) is formed on the surface of the body fluid absorber 4. This is because the portion of the body fluid absorber 4 that is not covered with the coating sheet 5 is eliminated, and thus, for example, the shape retention of the body fluid absorber 4 is improved. But in this form, since the coating sheet 5 has an overlap part, a bodily fluid may stagnate in this overlap part. When the body fluid stagnates, for example, the absorption rate is lowered, the body fluid is reversed, the feeling of wiping is reduced, and the absorption performance is lowered. Therefore, as shown in FIG. 2, the covering sheet 5 is formed by joining the covering sheet 5 a provided on the front surface side of the body fluid absorber 4 and the covering sheet 5 b provided on the back surface outside the peripheral edge of the body fluid absorber 4. (Hereinafter, this joined portion is also simply referred to as “joint portion”), and it is preferable that the joined portion is folded outward and joined to the back surface of the back-side coating sheet 5b as necessary. . According to this form, the surface side of the bodily fluid absorber 4 is constituted by the surface side covering sheet 5a and becomes flat (planar), and no overlap portion is formed (does not exist), so the absorption performance is reduced. There is no fear. Moreover, the surface side coating sheet 5a and the back surface side coating sheet 5b may be laminated, hydrophilized (usually, for the surface side coating sheet 5a), hydrophobized / water-repellent, as required. It can be processed (normally about the back surface side coating sheet 5b).

  The joining method in the outer periphery of the body fluid absorber 4 of the front surface side covering sheet 5a and the back surface side covering sheet 5b is not particularly limited. It can be the same as the joining in the extended part of the surface sheet 1 and the back surface sheet 2. In FIG. 2, the form adhered by hot melt H1 is shown.

  In this embodiment, it is preferable to form the front surface side covering sheet 5a with a nonwoven fabric and the back surface side covering sheet 5b with tissue paper, respectively. When the covering sheet 5a on the surface side, which is the skin surface side, is formed of a nonwoven fabric, mechanical processing such as embossing and pressing can be performed, and surface properties can be improved. Moreover, when the surface side coating sheet 5a is formed with a nonwoven fabric, there is also an advantage that it is difficult to tear. On the other hand, when the back surface side covering sheet 5b is formed of tissue paper, the above advantages of improved surface properties and resistance to tearing are realized at low cost. From the viewpoint of low cost, the covering sheet 5 is provided with the back sheet 2 or the like directly or indirectly on the back side of the body fluid absorbing element 3 without the back side covering sheet 5b only by the surface side covering sheet 5a. It can also be made into the form currently provided.

(Other)
(1) A second sheet 6 (see FIG. 2) can be interposed between the top sheet 1 and the body fluid absorbing element 3. When the second sheet 6 is interposed, it is possible to expect an improvement in the diffusibility of the body fluid.
(2) The back surface side cover sheet 5 b can be joined to the back surface sheet 2. By this joining, the back sheet 2 and the body fluid absorbing element 3 are prevented from shifting. In addition, this joining can be performed by the method similar to the joining in the extension part.
(3) The paper diaper 10 may be provided with known leakage prevention means such as a three-dimensional gather and a three-dimensional cuff.
(4) In this specification, for example, “consisting of” A and B does not mean “consisting only of” A and B. That is, the form including other than A and B and the form not including are also included.
(5) In this specification, “extending” means that the member exists along the corresponding direction.

[Material of each component]
(Fiber assembly made of tow)
The fiber assembly made of tow means a fiber assembly made of string-like spread bundles obtained by using tows (fiber bundles) made of fibers as raw materials and opening them. As described above, this fiber assembly includes a case where the fiber aggregate is composed of one string-shaped spread bundle and a case where the string is composed of a plurality of string-shaped spread bundles.

  Examples of tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable.

  As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, bacterial cellulose, and the like can be used. Regenerated cellulose such as rayon may be used, and the regenerated cellulose may be a spun fiber. The shape and size of cellulose is a continuous fiber that can be regarded as a substantially infinite length and has a long diameter of several millimeters to several centimeters (for example, 1 mm to 5 cm), and a particle diameter of about several microns (for example, 1 to 100 μm). Can be selected from various sizes up to a fine powder. Cellulose may be fibrillated, such as beaten pulp.

  Examples of the cellulose ester include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate acetate; polycaprolactone graft Cellulose ester derivatives such as hydrogenated cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, 50 to 900, preferably 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0, preferably about 2 to 3.

  The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, more preferably 200 to 800, and the average degree of substitution of the cellulose ester is, for example, 1 to 3, preferably 1 to 2. 15, more preferably 1.1 to 2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

  As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. Cellulose acetate can easily adjust the density.

  In addition, the acetylation degree of cellulose acetate is often about 43 to 62%, but particularly 30 to 50% is preferable because it is excellent in biodegradability.

  The tow constituent fiber may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like. Of these, the oil agent is effective for skin care that also serves as a water repellency, and may be applied to the tow constituent fibers.

  The fineness of the tow constituent fibers can be, for example, 1 to 16 denier, preferably 1 to 10 denier, more preferably 2 to 8 denier. The tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fibers can be, for example, 5 to 75, preferably 10 to 50, more preferably 15 to 50 per inch (2.54 cm). Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, bulky and lightweight spread bundles and fiber aggregates can be produced, and a highly integrated tow can be easily produced by entanglement between fibers. The cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good. The tow constituting fiber is used in the form of a tow (fiber bundle) formed by bundling, for example, 3,000 to 1,000,000, preferably 5,000 to 1,000,000 single fibers. Can do. The fiber bundle is preferably formed by bundling 3,000 to 1,000,000 continuous fibers.

  Tow is excellent in air permeability due to weak entanglement between fibers, but may sag. Therefore, for the purpose of preventing sagging and maintaining a wide gap, it is preferable to use a binder having an action of bonding or fusing the contact portion of the fiber.

  Examples of binders include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and triethyl citrate, as well as various resin adhesives, especially thermoplastic resins. Can be used.

  The thermoplastic resin is a resin that exhibits an adhesive force when melted and solidified, and includes a water-insoluble or hardly water-soluble resin and a water-soluble resin. A water-insoluble or poorly water-soluble resin and a water-soluble resin can be used together as necessary.

  Examples of water-insoluble or hardly water-soluble resins include olefinic homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, polyvinyl acetate, polymethyl methacrylate, methacryl Acid methyl-acrylic acid ester copolymer, acrylic resin such as copolymer of (meth) acrylic monomer and styrene monomer, polyvinyl chloride, vinyl acetate-vinyl chloride copolymer, polystyrene, styrene monomer ( Styrenic polymers such as copolymers with (meth) acrylic monomers, optionally modified polyesters, nylon 11, nylon 12, nylon 610, nylon 612 and other polyamides, rosin derivatives (eg, rosin esters), Hydrocarbon resin (for example, terpene resin Dicyclopentadiene resin, petroleum resin), and hydrogenated hydrocarbon resins. One or two or more of these thermoplastic resins can be used.

  Examples of water-soluble resins include various water-soluble polymers such as polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl ether, vinyl monomers, and copolymerizable monomers having a carboxyl group, a sulfonic acid group, or a salt thereof. Vinyl water-soluble resins such as copolymers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble resins can be used alone or in combination of two or more.

  Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.

  The fiber assembly can be produced using tow as a raw material by using a known opening method, and in that case, it can be opened in a strip shape so as to have a desired size and bulk as necessary. it can. The opening width of the tow is arbitrary, and can be, for example, a width of 100 to 2000 mm, preferably 150 to 1500 mm. By adjusting the degree of tow opening, the fiber density of the body fluid absorber can also be adjusted.

  Tow opening methods include, for example, a method in which tow is spread over a plurality of opening rolls, and the tow width is gradually expanded as the tow progresses, and tow tension (elongation) and relaxation (contraction) And the like, and a method of widening and opening using compressed air can be used.

  FIG. 7 is a schematic diagram illustrating an example of the opening facility. In this example, the tow 71 serving as a raw fabric is sequentially fed out, and in the conveying process, a widening means 77 using compressed air and a plurality of spread nip rolls 73, 74, 75 whose peripheral speed is faster as the downstream side roll is combined. After passing through the opened portion and widened / opened, it is passed through a binder addition box 76, and a binder is applied (for example, the box 76 is filled with mist of triacetin), and a spread bundle having a desired width and density is obtained. 33 is formed.

(Surface sheet 1 and second sheet 6)
In this embodiment, the top sheet 1 and the second sheet 6 have a property of transmitting body fluid. Therefore, the material of the top sheet 1 and the second sheet 6 is sufficient as long as it exhibits this body fluid permeability, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. Examples include synthetic fibers such as polyethylene and polypropylene such as olefins, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used. can do. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punch method. For example, the spun lace method is a preferable processing method for obtaining flexibility and drapeability, and the thermal bond method is for obtaining bulkiness and softness.
Further, the top sheet 1 and the second sheet 6 may be composed of one sheet or two or more sheets in the planar direction.

(Body fluid absorber 4)
The body fluid absorber 4 has a property of holding the absorbed body fluid, and is formed by mixing an absorbent polymer into a fiber assembly formed of a string-shaped spread bundle obtained by opening a tow. Can do. Hereinafter, this case will be described in detail.

  FIG. 8 shows an example of a production facility for the body fluid absorbing element 3, which is composed of one or a plurality of the above-described spread bundles 33 (see FIGS. 3 to 6), and has a continuous band shape with a desired width and density. A fiber assembly 34 is supplied. For this reason, after this continuous body fluid absorption element production line is made continuous with the above-mentioned spread bundle production line, the produced fiber bundle 33 is appropriately made into a fiber assembly 34, and then this fiber assembly 34 is produced as a main body fluid absorption element. Can be sent to the line.

  The supplied fiber assembly 34 is first passed through an absorbent polymer supply device 87 including a spray box, a rotating drum, and the like, and after the absorbent polymer 35 is sprayed, it is fed into the suction drum 88. The suction drum 88 has an intake hole on the outer peripheral wall, and is configured to be sucked by a suction pump (not shown) from the inside over a predetermined range in the circumferential direction (a range substantially in the left half in the illustrated example). The fiber assembly 34 in which the absorbent polymer 35 is dispersed is guided by the suction drum 88 while being in contact with the outer peripheral surface. In this process, by suction from the suction hole of the suction drum 88, the atmosphere passes from the absorbent polymer 35 application side to the opposite side through the fiber assembly 34, and the absorbent polymer 35 is caused to pass by the passing force. , Moved into the fiber assembly 34.

  In a particularly preferred form, after the absorbent polymer 35 is dispersed on the fiber assembly 34, the back surface side coating sheet 5b is further covered thereon. In this case, in the suction drum 88, suction is performed from the side surface of the fiber assembly 34 opposite to the surface covered with the back surface side coating sheet 5b. Thus, when the back surface side covering sheet 5b is covered prior to suction, a stronger suction force acts on the absorbent polymer 35 as compared with the case where nothing is covered, and the absorbent polymer 35 is efficiently obtained. Can be moved and dispersed into the fiber assembly 34.

  In order to fix the absorbent polymer 35 to the fiber assembly 34, it is also a preferred form that an adhesive is applied to the fiber assembly 34 before the absorbent polymer 35 is applied. For this reason, as shown in the drawing, an adhesive application device 84 can be disposed upstream of the absorbent polymer supply device 87.

  Moreover, when covering with the back surface side coating sheet 5b, before covering the back surface side coating sheet 5b, it is also a preferable form to supply an adhesive to the surface which becomes the fiber assembly 34 side of the back surface side coating sheet 5b. For this reason, in the illustrated embodiment, the adhesive coating device 85 is provided in the supply path of the back surface side covering sheet 5b to the suction drum 88. When this form is adopted, the absorbent polymer 35 exposed on the surface of the fiber assembly 34 is fixed to the back surface side coating sheet 5b via an adhesive, and the unadsorbed absorbent polymer 35 is absorbed by the fiber suction 34 by a subsequent suction. It will be moved inside.

  Furthermore, it is also a preferable mode to supply an adhesive to the fiber assembly 34 after suction, that is, after the absorbent polymer 35 is moved. For this reason, in the illustrated embodiment, an adhesive application device 86 is provided on the exposed side surface (the opposite surface from the back surface side covering sheet 5b side, the upper surface in the drawing) of the fiber assembly 34 on the downstream side of the suction drum 88. When this form is employed, the absorbent polymer 35 that has moved to the side opposite to the polymer application side of the fiber assembly 34 among the applied absorbent polymers 35 can be fixed to the fiber assembly 34. Further, when the exposed side surface of the fiber assembly 34 is covered with the surface side coating sheet 5a, the absorbent polymer 35 moved to the exposed side surface of the fiber assembly 34 is fixed to the surface side coating sheet 5a. can do. Any one or a combination of two or more of these adhesives can be applied. As the adhesive, an adhesive made of a thermoplastic resin (specific examples are as described above) can be suitably used.

  Thus, the fiber assembly 34 (that is, the body fluid absorber 4) to which the absorbent polymer 35 is applied (mixed) is covered with, for example, a front surface side coating sheet 5a separately, and the front surface side coating sheet 5a and the back surface side coating sheet 5b. Is joined outside the peripheral edge of the body fluid absorber 4, and if necessary, the joined portion is folded outward and joined to the back surface of the back surface side covering sheet 5 b and then cut to a predetermined length. The individual body fluid absorbing element 3 is used.

  The quantitative arrangement and density distribution of the absorbent polymer 35 with respect to the fiber assembly 34 are preferably uniform for the purpose of general-purpose purposes, but the purpose is to exhibit special absorption characteristics. It is also preferable to bias in accordance with the above.

  Specifically, in the case of applying to the illustrated form, in the absorbent polymer supply device 87, the spray amount can be biased in the plane direction. Further, by biasing the suction force in the suction drum 88, a higher amount of the absorbent polymer 35 is located on the suction drum 88 side as the suction force is higher. Therefore, the density of the absorbent polymer 35 is reduced. Can be biased. For example, the density of the absorbent polymer 35 in the center portion in the width direction of the fiber assembly 34 can be increased by making the suction force in the center in the width direction of the suction drum 88 higher than the both side portions (or by increasing the suction time). Can be higher than the sides.

  Furthermore, since the liquid aggregate 34 easily flows along the continuous direction of the fibers, it is possible to impart special absorption characteristics by biasing the density of the fibers. For this reason, as a method of biasing the fiber density, it can be achieved by performing uneven fiber opening at the time of manufacturing the fiber bundle 33, or by partially using a plurality of tows. For example, if the fiber density in the center portion in the width direction of the fiber assembly 34 is biased so as to be higher than both side portions, the diffusion speed of the body fluid becomes higher in the center portion in the width direction of the fiber assembly 34.

(Back sheet 2)
In this embodiment, the back sheet 2 has a property of not transmitting body fluid. Accordingly, the material of the back sheet 2 is sufficient if it exhibits this body fluid impermeability, for example, an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, or a waterproof film is interposed. Thus, a non-woven fabric that is substantially impervious to liquids (in this case, the waterproof film and the non-woven fabric constitute the back sheet 2 that is impermeable to bodily fluids) can be exemplified. Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given.

(Coating sheet 5)
In this embodiment, the material of the covering sheet 5 is not particularly limited. Specifically, for example, a body fluid permeable sheet such as crepe paper, tissue paper, non-woven fabric, or a perforated sheet can be used. However, as described above, it is preferable that the front surface side cover sheet 5a is formed of a nonwoven fabric and the back surface side cover sheet 5b is formed of tissue paper.

(Absorbent polymer 35)
As the absorptive polymer 35, a polymer that absorbs and retains bodily fluids, for example, ten times or more of its own weight can be used. Examples of this include starch-based, cellulose-based and synthetic polymer-based materials such as starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile copolymer saponified product, sodium carboxymethylcellulose cross-linked product and acrylic. An acid (salt) polymer or the like can be used. The shape of the absorbent polymer 35 is preferably a granular material that is usually used, but other shapes can also be used.

The present invention may be fastening tape type disposable diaper or pants type disposable diaper, sanitary napkins, absorbent pads, and a body fluid absorbent articles such as incontinence pads, apply.

It is a plane schematic diagram of the paper diaper of this form. FIG. 2 is a schematic cross-sectional view taken along the line II of FIG. 1. It is an example of a form of a spread bundle. It is an example of a form of a spread bundle. It is an example of a form of a spread bundle. It is an example of a form of a spread bundle. It is the schematic which shows the manufacturing flow of a spread bundle. It is the schematic which shows the manufacturing flow of a bodily fluid absorber and a bodily fluid absorption element.

  DESCRIPTION OF SYMBOLS 1 ... Surface sheet, 2 ... Back surface sheet, 3 ... Body fluid absorption element, 4 ... Body fluid absorber, 5 ... Coating sheet, 5a ... Surface side coating sheet, 5b ... Back surface side coating sheet, 6 ... Second sheet, 10 ... Paper diaper, 33 ... spread bundle, 34 ... fiber assembly, 35 ... absorbent polymer.

Claims (2)

The body fluid absorbent is a body fluid absorbent article that is interposed between the top sheet and the back sheet ,
The bodily fluid absorber comprises a fiber assembly composed of a string-like spread bundle obtained by opening a tow as a constituent material, and
The body fluid-absorbing article , wherein the fiber assembly is formed by winding the spread bundle into a figure 8 in plan view . The bodily fluid absorbent article according to claim 2, wherein an absorbent polymer is mixed in the fiber assembly.

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