JP2007202595A - Body liquid absorber and body liquid absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper diaper or a sanitary napkin preventing a body liquid absorber constituted of a fiber aggregate and an absorbent polymer from looking yellowish. <P>SOLUTION: The body fluid absorber 31 is constituted of the fiber aggregate and the absorbent polymer. In this case, as the absorbent polymer uses the absorbent polymer having an absorbency of 15 g/g or more under a load of 6.2 kPa is used. Further, basics weight in a plane direction is changed stepwise. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bodily fluid absorber composed of a fiber assembly and an absorbent polymer, and a bodily fluid absorbent article such as a paper diaper and a sanitary napkin using the bodily fluid absorber.

Conventionally, as this type of body fluid absorber, there has been one constituted of a fluffy pulp fiber aggregate, a fiber aggregate such as a fiber aggregate made of tow, or a granular absorbent polymer. This conventional bodily fluid absorber is commercially available as a bodily fluid absorbent article such as a paper diaper or sanitary napkin by being interposed between a bodily fluid permeable top sheet and a bodily fluid impermeable waterproof sheet. ing.
And since this conventional bodily fluid absorber or bodily fluid absorbent article may absorb and deteriorate the absorbent polymer, in recent years, in order to prevent the absorbent polymer from degrading and decomposing. For example, the proposal which contains stabilizers, such as an antibacterial agent containing an antioxidant and a metal, between a top sheet and an absorptive polymer is made (for example, refer to patent documents 1).
However, when a stabilizer is contained in the body fluid absorber or body fluid absorbent article, the normally colorless stabilizer turns yellow in a high humidity condition or the like (yellow transition), and the body fluid absorber or body fluid absorbent article becomes Sometimes it looked yellowish. If the body fluid absorber or body fluid absorbent article looks yellowish in this way, the user is unsanitary and there is a case where the product becomes a complaint.
JP 2002-336297 A

  The main problem to be solved by the present invention is to provide a bodily fluid absorber and a bodily fluid absorbent article that are less likely to appear yellowed.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A bodily fluid absorber composed of a fiber assembly and an absorbent polymer,
The body fluid absorber, wherein the absorbent polymer has an absorption amount of 15 g / g or more under a load of 6.2 kPa.

[Invention of Claim 2]
A bodily fluid absorbent article comprising a bodily fluid permeable top sheet, a fiber assembly, and a bodily fluid absorbent body composed of an absorbent polymer and a bodily fluid impermeable waterproof sheet, in this order,
A bodily fluid absorbent article, wherein the absorbent polymer has an absorption amount of 15 g / g or more under a load of 6.2 kPa, and the basis weight in the plane direction is changed stepwise.

[Invention of Claim 3]
The bodily fluid absorbent article according to claim 2, wherein the weight of the absorbent polymer is changed stepwise so that the amount of the absorbent polymer is relatively smaller at the center portion in the width direction than at both side portions.

  According to this invention, it becomes a bodily fluid absorber and a bodily fluid absorptive article with little possibility of appearing yellow.

  Next, an embodiment of the present invention will be described. In the following, a case where the body fluid absorbent article is a “fixing tape-type paper diaper” will be described as an example.

[Shape of paper diapers, etc.]
As shown in FIGS. 1 and 2, the disposable diaper 10 according to the present embodiment includes a bodily fluid permeable top sheet 1, a bodily fluid impermeable waterproof sheet 2, and bodily fluid absorption interposed between these sheets 1 and 2. Element 3 and so on.

  The body fluid absorption element 3 mainly includes a body fluid absorber 31 composed of a fiber assembly and an absorbent polymer, and a covering sheet 32 that covers the body fluid absorber 31. In the body fluid absorbing element 3 of this embodiment, the body fluid absorber 31 is held in shape by the covering sheet 32. Further, as shown in FIG. 1, the body fluid absorbing element 3 of the present embodiment has a substantially planar hourglass shape with a narrow central portion in the front-rear direction.

  In the bodily fluid absorber 31 of this embodiment, the absorbent polymer has an absorption amount of 15 g / g or more under a 6.2 kPa load, preferably 20 g / g or more under a 6.2 kPa load. Absorption of the absorbent polymer under a high load (6.2 kPa) is as high as 15 g / g or more, because the absorbent polymer has excellent liquid permeability and unnecessary contact between the absorbent polymer and body fluid is eliminated. Deterioration and decomposition of the conductive polymer are suppressed. Therefore, the stabilizer is not contained or the content of the stabilizer can be reduced, and the possibility that the bodily fluid absorber 31 and the paper diaper 10 may appear yellowed can be reduced. In addition, the absorption amount of an absorptive polymer can be 40 g / g or less under a 6.2 kPa load.

  Thus, the bodily fluid absorber 31 of this embodiment can contain no stabilizer. However, if the stabilizer is not contained, the absorbent polymer may not be completely prevented from being deteriorated or decomposed. Therefore, when there is a possibility that deterioration and decomposition of the absorbent polymer cannot be completely prevented, it is preferable to reduce the stabilizer. Therefore, in order to reduce the possibility that the bodily fluid absorber 31 and the paper diaper 10 may appear yellowed even when only reducing the stabilizer, that is, when the stabilizer is contained in a small amount. In addition to having an absorption amount of 15 g / g or more under a 6.2 kPa load, the conductive polymer preferably has a basis weight that is gradually changed (gradation) in the planar direction. In the conventional body fluid absorber, the absorbent polymer is partially dispersed, so that the stabilizer is also partially contained. Therefore, there is a boundary between the stabilizer-containing portion and the non-containing portion. The yellow change became noticeable. On the other hand, if the basis weight of the absorbent polymer is changed stepwise, the content of the stabilizer can also be changed stepwise, so that the boundary line cannot be made and the yellow change becomes inconspicuous. it can.

  In this embodiment, as the stabilizer, for example, a metal compound such as sodium sulfite can be used.

  As described above, when the weight of the absorbent polymer is changed stepwise, the weight of the absorbent polymer is relatively smaller than the both side portions in the central portion in the width direction as shown in FIG. Preferably, it is changed stepwise. If the weight of the absorbent polymer is relatively less at the widthwise center than at both sides, the stabilizer content is also relatively less at the widthwise center than at both sides. It is possible to suppress yellowing at the center in the width direction. In this respect, the yellow change at the central portion in the width direction tends to give the user a sense of unsanitary effect. Therefore, the suppression of the yellow change at the central portion in the width direction is very effective for suppressing the unsanitary feeling.

  As described above, when the weight per unit area of the absorbent polymer is changed stepwise so as to be relatively smaller than the both side portions in the width direction central portion, the step change is the front end portion of the body fluid absorber 31. To the rear end.

However, from the viewpoint of manufacturing cost reduction by reducing the amount (dispersion) of the absorbent polymer and the stabilizer and further suppression of yellowing, the following is preferable.
That is, when the paper diaper 10 is used for a woman (girl), as shown in FIG. 3, the weight per unit area is small in the central portion 31A in the width direction of the bodily fluid absorber 31, and both the central portion in the front-rear direction of the central portion 31A in the width direction are used. In the side portions 31B and 31B, the basis weight is larger than that in the center portion 31A in the width direction, and in the both side portions of the front and rear ends of the center portion 31A in the width direction, the basis weight is smaller than that in the center portion 31A in the width direction. That is, in this embodiment, the stepwise change shown based on FIG. 5 is realized only in the central part in the front-rear direction. This form is a containing form of the absorbent polymer in line with the female (girl) excretion mode, and the absorption performance is sufficiently ensured.

  On the other hand, when the paper diaper 10 is for a male (boy), as shown in FIG. 4, both the weight per unit area at the central portion 31A in the width direction of the body fluid absorber 31 and the front end portion of the central portion 31A in the width direction are both. In the side portions 31C, 31C, the basis weight is larger than that in the width direction center portion 31A, and the basis weight in the width direction center portion 31A is smaller than that in the width direction center portion 31A. To do. That is, in this embodiment, the stepwise change shown based on FIG. 5 is realized only at the front end. This form is a containing form of the absorbent polymer in line with the male (boy) excretion mode, and the absorption performance is sufficiently ensured.

  On the other hand, the type of the fiber assembly constituting the body fluid absorber 31 is not particularly limited. For example, a fluffy pulp fiber aggregate can be exemplified. However, the fiber assembly constituting the body fluid absorber 31 is preferably a fiber assembly made of tow. Since the fiber assembly made of tow has many voids and good liquid permeability, unnecessary contact between the absorbent polymer and the body fluid is eliminated, and deterioration and decomposition of the absorbent polymer are suppressed. Therefore, the stabilizer is not contained or the content of the stabilizer can be reduced, and the possibility that the bodily fluid absorber 31 and the paper diaper 10 may appear yellowed can be reduced.

  As described above, the bodily fluid absorber 31 of the present embodiment is characteristic, but the method for mixing the absorbent polymer into the fiber assembly is not particularly limited. It can be the same as the conventional mixing method.

(Other)
(1) A second sheet 4 (see FIG. 2) can be interposed between the top sheet 1 and the body fluid absorbing element 3. When the second sheet 4 is interposed, it is possible to expect an improvement in the diffusibility of the body fluid.
(2) The body fluid absorbing element 3 can be joined to the waterproof sheet 2. By this joining, it is possible to expect an improvement in shape retention of the paper diaper 10. 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 the present specification, liquid permeability means the amount per unit time through which body fluid passes.

[Material of each component]
(Fiber assembly made of tow)
The fiber assembly made of tow means a fiber assembly made of tows (fiber bundles) composed of fibers, that is, manufactured using tow as a raw material. 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 constituting fiber may contain various additives, for example, a stabilizer 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 content of the stabilizer is as described above.

  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, a bulky and lightweight fiber assembly 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 by a known method using tow as a raw material, and at that time, it can be opened in a strip shape so as to have a desired size and bulk as necessary. 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. The fiber density of the absorbent body can be adjusted by adjusting the degree of tow opening.

  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. 6 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 added (for example, the box 76 is filled with mist of triacetin), and the tow having a desired width and density is formed. A fiber assembly 33 is formed.

(Top sheet 1)
In this embodiment, the top sheet 1 has a property of permeating body fluid. Therefore, the material of the top sheet 1 is sufficient if it exhibits this body fluid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. 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 when the flexibility and drape properties are required, and the thermal bond method is the preferable processing method when the bulkiness and softness are required.

  Moreover, the top sheet 1 may be composed of a single sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 1 may be composed of one sheet or two or more sheets with respect to the planar direction.

(Body fluid absorbing element 3, body fluid absorber 31)
In this embodiment, the body fluid absorber 31 includes the fiber assembly 33 and the absorbent polymer 35, and has a property of holding the absorbed body fluid. The material of the fiber assembly 33 is not particularly limited. For example, known materials such as cotton-like pulp and synthetic pulp can be exemplified. Moreover, the raw material fiber of a pulp is not specifically limited, For example, the cellulose fiber obtained from woods, such as a mechanical pulp, a chemical pulp, and a dissolving pulp, Artificial cellulose fibers, such as rayon and an acetate, etc. can be illustrated. However, wood, which is a raw material for cellulose fibers, is preferable in terms of function and price because conifers have a longer fiber length than hardwoods.

  However, the fiber assembly 33 is preferably a fiber assembly made of tow as described above. Hereinafter, this case will be described in detail.

  FIG. 7 shows an example of a production facility for the body fluid absorbing element 3, and a continuous belt-like fiber assembly 33 made of tows having a desired width and density is supplied. For this reason, this continuous body liquid absorption element manufacturing line is directly connected with the above-mentioned fiber assembly manufacturing line, and the manufactured fiber assembly 33 can be directly sent to the main body liquid absorption element manufacturing line.

  The supplied fiber assembly 33 is first passed through an absorbent polymer (and stabilizer) supply device 87 including a spray box, a rotating drum, and the like, and the absorbent polymer 35 and a stabilizer (not shown) are, for example, After being sprayed with a step change as described above, 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 33 in which the absorbent polymer 35 and the stabilizer are dispersed is guided by the suction drum 88 while being in contact with the outer peripheral surface. In this process, by performing suction from the suction holes of the suction drum 88, the atmosphere passes through the fiber assembly 33 from the absorbent polymer 35 and the stabilizer-imparting side to the opposite side. The absorbent polymer 35 and the stabilizer are moved into the fiber assembly 33. Of course, the stabilizer can be dispersed separately from the absorbent polymer 35 or not sucked (a form in which the stabilizer is placed on the fiber assembly 33).

  As the absorptive polymer 35, a polymer having an absorption amount of 15 g / g or more under a load of 6.2 kPa and absorbing and holding a body fluid, for example, 10 times or more of its own weight can be used. Absorptive polymers that absorb body fluid more than 10 times their own weight include, for example, starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, starch-acrylonitrile copolymer. Examples thereof include a saponified compound, a crosslinked product of sodium carboxymethyl cellulose, and an acrylic acid (salt) polymer.

  The shape of the absorbent polymer 35 is preferably a granular material that is usually used, but other shapes can also be used.

  In a particularly preferable form, after the absorbent polymer 35 is spread on the fiber assembly 33, the covering sheet 32 is further covered thereon. In this case, suction is performed from the side opposite to the surface of the fiber assembly 33 covered with the covering sheet 32 in the suction drum 88. As described above, when the covering sheet 32 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 attached to the fiber. It can be moved and dispersed inside the assembly 33.

  In order to fix the absorbent polymer 35 to the fiber assembly 33, it is also a preferred form that an adhesive is applied to the fiber assembly 33 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 the covering sheet 32, it is also a preferable form to supply the adhesive to the surface of the covering sheet 32 on the fiber assembly 33 side before covering the covering sheet 32. For this reason, in the illustrated embodiment, an adhesive application device 85 is provided in the coating sheet 32 supply path to the suction drum 88. When this form is adopted, the absorbent polymer 35 exposed on the surface of the fiber assembly 33 is fixed to the covering sheet 32 via an adhesive, and the non-adherent absorbent polymer 35 is brought into the fiber assembly 33 by subsequent suction. It will be moved.

  Furthermore, it is also a preferable mode to supply the adhesive to the fiber assembly 33 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 of the fiber assembly 33 on the downstream side of the suction drum 88 (the surface opposite to the coating sheet 32 side, the upper surface in the drawing). When this form is adopted, the absorbent polymer 35 that has moved to the side opposite to the polymer application side of the fiber assembly 33 among the applied absorbent polymers 35 can be fixed to the fiber assembly 33. Further, when the exposed side surface of the fiber assembly 33 is separately covered with the covering sheet 32, or both sides of the covering sheet 32 previously covered are wrapped around both ends of the fiber assembly 33, the fiber assembly The absorbent polymer 35 that has moved to the exposed side surface 33 can be fixed to the covering sheet 32.

  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 33 to which the absorbent polymer 35 has been applied (that is, the body fluid absorber 31) is covered with, for example, a separate covering sheet 32, or the both ends of the covering sheet 32 are covered with a sailor as shown in the figure. After turning around both ends of 33 and covering it, it is cut into a predetermined length to form individual body fluid absorbing elements 3.

  On the other hand, the quantitative arrangement (weight per unit area) and density distribution of the absorbent polymer 35 with respect to the fiber assembly 33 are uniform for the purpose of general purpose except that it is changed stepwise as described above. However, when it is intended to exhibit special absorption characteristics, it is also preferable to bias it according to the purpose.

  Specifically, when the present invention is applied 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 at the center in the width direction of the fiber assembly 33 can be increased by making the suction force at the center in the width direction of the suction drum 88 higher than the sides (or by increasing the suction time). Can be higher than the sides.

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

(Waterproof sheet 3)
In this embodiment, the waterproof sheet 3 has a property of not transmitting body fluid. Therefore, the material of the waterproof sheet 3 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 liquid (in this case, the waterproof film and the non-woven fabric constitute the body fluid-impermeable waterproof sheet 3) and the like. 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.

(Second sheet 4, covering sheet 32)
In this embodiment, the material of the second sheet 4 and the covering sheet 32 is not particularly limited as long as the material has a property of permeating body fluid. For example, the same material as exemplified as the top sheet 1 can be used. Specifically, for example, a body fluid permeable sheet such as a crepe paper, a nonwoven fabric, or a perforated sheet can be used.

  INDUSTRIAL APPLICABILITY The present invention can be applied as a body fluid absorbent article such as a fastening tape type paper diaper or a pants type paper diaper, a sanitary napkin, an absorbent pad, a urine collection pad, and a body fluid absorbent body of the body fluid absorbent article.

It is a top view of a paper diaper. It is the II sectional view taken on the line of FIG. It is a plane schematic diagram of a bodily fluid absorber example. It is a plane schematic diagram of a bodily fluid absorber example. It is a figure which shows the fabric weight regarding the cross-sectional direction of an absorptive polymer. It is the schematic which shows the manufacturing flow of a fiber assembly. It is the schematic which shows the manufacturing flow of a bodily fluid absorber and a bodily fluid absorption element.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... Waterproof sheet, 3 ... Body fluid absorption element, 4 ... Second sheet, 10 ... Paper diaper, 31 ... Body fluid absorber, 32 ... Cover sheet, 33 ... Fiber assembly, 35 ... Absorbent polymer.

Claims (3)

A bodily fluid absorber composed of a fiber assembly and an absorbent polymer,
The body fluid absorber, wherein the absorbent polymer has an absorption amount of 15 g / g or more under a load of 6.2 kPa. A bodily fluid absorbent article comprising a bodily fluid permeable top sheet, a fiber assembly, and a bodily fluid absorbent body composed of an absorbent polymer and a bodily fluid impermeable waterproof sheet, in this order,
A bodily fluid absorbent article, wherein the absorbent polymer has an absorption amount of 15 g / g or more under a load of 6.2 kPa, and the basis weight in the plane direction is changed stepwise.   The bodily fluid absorbent article according to claim 2, wherein the weight of the absorbent polymer is changed stepwise so that the amount of the absorbent polymer is relatively smaller at the center portion in the width direction than at both side portions.

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