JP2017093828A - Absorbent article - Google Patents

Absorbent article Download PDF

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JP2017093828A
JP2017093828A JP2015229472A JP2015229472A JP2017093828A JP 2017093828 A JP2017093828 A JP 2017093828A JP 2015229472 A JP2015229472 A JP 2015229472A JP 2015229472 A JP2015229472 A JP 2015229472A JP 2017093828 A JP2017093828 A JP 2017093828A
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Prior art keywords
polymer
sheet
absorbent article
sheets
arranged
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JP2015229472A
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JP6189399B2 (en
JP2017093828A5 (en
Inventor
恵 葭葉
Megumi Ashiba
恵 葭葉
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大王製紙株式会社
Daio Paper Corp
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Publication of JP2017093828A5 publication Critical patent/JP2017093828A5/ja
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression

Abstract

PROBLEM TO BE SOLVED: To prevent gel blocking while achieving thinning and also securing an amount of water absorption.SOLUTION: A sanitary napkin 1 includes a polymer sheet 4 in which a high-water absorbent polymer 12 is included between two layered sheets 10 and 11, and has a multilayer structure where the plurality of polymer sheets 4 are laminated. Each of the polymer sheets 4 is formed with a polymer arrangement area 13 in which the high-water absorbent polymer 12 is arranged, and a polymer non-arrangement area 14 in which the high-water absorbent polymer 12 is not arranged. The polymer arrangement areas 13 are provided in a position in which they are not overlapped in the thickness direction in at least between the polymer sheets 4 adjacent in the lamination direction, and the two layered sheets 10 and 11 are connected by a compressed groove 15 provided in a part in which the high-water absorbent polymer 12 is not arranged.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner, an incontinence pad, and more particularly to an absorbent article provided with a polymer sheet in which a superabsorbent polymer is disposed between two sheets.

  Conventionally, as the absorbent article, a body fluid is absorbed and retained between a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet. The thing which interposed the absorber provided with the function to perform is known.

  The absorbent article is required to be thin in consideration of convenience of handling, a feeling of wearing, and the like. Naturally, the absorbent body which is one of the constituents is also required to be thin. However, even if the thickness is reduced or the size is reduced, the amount of water absorption cannot be reduced, so that the blending ratio of the superabsorbent polymer is inevitably increased. In view of this, in recent years, an absorbent article including a polymer sheet having no fibrous absorbent material such as pulp in which a superabsorbent polymer is interposed between two layers of sheets has been proposed.

  However, it has been pointed out that the polymer sheet is prone to so-called “gel blocking” in which voids between polymer particles swollen at the time of water absorption are extremely reduced, and the required water absorption force cannot be expressed. Along with this, menstrual blood and urine permeation are inhibited by the bonding between the polymer particles, and menstrual blood and urine that have been impeded from permeation return to the skin side again.

  As a technique for solving these problems, for example, in Patent Document 1 below, the first sheet and the second sheet are extended in the longitudinal direction of the water absorbent sheet and spaced apart in the width direction of the water absorbent sheet. A plurality of water-absorbing resin powder existing areas arranged in parallel are formed, and the water-absorbing sheet does not exist between adjacent adjacent areas and in the widthwise ends of the water-absorbing sheet. The first sheet and the second sheet are joined in the non-existing area, a part of the non-existing area is a sheet peeling area, and the sheet peeling area is the first peeling area. An absorbent article is disclosed in which the sheet and the second sheet are peeled off by liquid absorption and swelling of the water absorbent resin powder.

  Moreover, in the following Patent Document 2, a water-absorbent sheet having a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched between hydrophilic nonwoven fabrics, wherein two or more layers of a base material having air permeability are included. A water-absorbing sheet having a structure in which the absorbent layer is divided into a primary absorbent layer and a secondary absorbent layer by a base material layer bonded and laminated with an adhesive is disclosed.

JP 2009-61230 A International Publication No. WO2010 / 143635

  In the absorbent article described in Patent Document 1, the presence area and non-existence area of the water absorbent resin powder extending in the longitudinal direction of the water absorbent sheet are alternately arranged in the width direction of the water absorbent sheet. The menstrual blood and urine absorbed in the region are absorbed in the water absorbent resin powder while being diffused in the surface direction of the water absorbent sheet through the non-existing region, so that a large amount of the water absorbent resin powder is contained. Although it is said that absorption inhibition and gel blocking are difficult to occur, since the water-absorbent sheet is composed of one layer, the water-absorbent resin powder of this layer absorbs and swells to reduce the gap between the polymer particles. Subsequent water permeability decreased and gel blocking was likely to occur. Moreover, since the water-absorbent sheet is composed of one layer, in order to secure the amount of water absorption, the separation width between adjacent areas of the water-absorbent resin powder (width of the non-existing area) has to be narrowed. When the resin powder absorbs water and swells and a part of the non-existing region of the water-absorbing resin powder is peeled off, the water-absorbing resin in the adjacent existing region is bonded to each other to easily cause gel blocking.

  In the water-absorbent sheet described in Patent Document 2, the absorbent layer is separated into a primary absorbent layer (upper layer) and a secondary absorbent layer (lower layer) by the base material layer, and body fluid stays in the base material layer and is moderate. It is said that gel blocking can be avoided by diffusing and penetrating into the upper and lower layers, but the upper and lower water-absorbing resins are provided at positions overlapping in the thickness direction, so that the upper water-absorbing resin absorbs water and swells. When gel blocking occurs, there may be a problem that body fluid does not penetrate into the lower layer.

  Then, the main subject of this invention is providing the absorbent article which prevented gel blocking, ensuring water absorption amount, aiming at thickness reduction.

In order to solve the above problems, as the present invention according to claim 1, an absorbent article comprising a polymer sheet in which a superabsorbent polymer is interposed between two layers of sheets,
The polymer sheet has a multilayer structure in which a plurality of the polymer sheets are laminated, and each polymer sheet is formed with a polymer arrangement region in which the superabsorbent polymer is arranged and a polymer non-arrangement region in which the superabsorbent polymer is not arranged, At least between the polymer sheets adjacent to each other in the laminating direction, the compressed grooves formed in a portion where the polymer arrangement regions do not overlap in the thickness direction and the two-layer sheets are not arranged with the superabsorbent polymer An absorbent article characterized by being bonded by the above is provided.

  In the first aspect of the present invention, the absorbent article is thinned because the body fluid absorber includes a polymer sheet in which a superabsorbent polymer is interposed between two layers of sheets. In addition, since the polymer sheet has a multilayer structure in which a plurality of the polymer sheets are laminated, if the amount of the highly water-absorbing polymer that can obtain a desired water-absorbing amount as a whole is secured, the amount of the highly water-absorbing polymer per layer is increased. Because the water-absorbing polymer that has absorbed water and swollen has improved the fluidity of the polymer flowing between the two layers of each polymer sheet, gel blocking is difficult to occur because the swollen polymer stays and the polymers are bonded to each other. Become.

  Further, in the absorbent article according to the present invention, each polymer sheet is formed with a polymer arrangement region in which the superabsorbent polymer is arranged and a polymer non-arrangement region in which the superabsorbent polymer is not arranged, at least in the laminating direction. Between the polymer sheets adjacent to each other, the polymer arrangement regions are provided at positions that do not overlap with each other in the thickness direction, so that the contact between the superabsorbent polymer and the body fluid is improved, and the body fluid is absorbed by the superabsorbent polymer. It becomes easy to be done. In addition, even when the upper layer superabsorbent polymer absorbs water and swells, the permeability of the body fluid is reduced, and the body fluid is arranged in the lower polymer arrangement region through the upper polymer non-arrangement region. Therefore, the amount of water absorbed as a whole can be ensured. Further, even if the water absorption amount of the superabsorbent polymer increases, the superabsorbent polymer of each polymer sheet flows in the plane direction, and the existence area of the superabsorbent polymer overlaps the thickness direction of the absorbent article, each layer Since the sheet material constituting the polymer sheet is interposed between the superabsorbent polymers, body fluid can be diffused through the sheet material, and gel blocking is difficult to occur. Since it is absorbed by the superabsorbent polymer, it does not return to the skin side.

  Furthermore, in the present invention, since the two-layer sheet is joined by a compressed groove provided in a portion where the superabsorbent polymer is not disposed, the diffusion of body fluids is greater than when bonded with a hot melt adhesive or the like. The water absorption can be increased without impairing the permeability and permeability.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the polymer arrangement region extends along the longitudinal direction of the absorbent article and is arranged in parallel at intervals in the width direction. .

  In the invention of the second aspect, since the polymer arrangement region is provided in the form of vertical stripes extending along the longitudinal direction of the absorbent article and arranged in parallel at intervals in the width direction, the polymer arrangement region , Body fluid can easily diffuse in the longitudinal direction of the absorbent article, and side leakage of body fluid can be prevented.

  As this invention which concerns on Claim 3, the pressing part for division which divides the said polymer arrangement | positioning area | region into multiple in the longitudinal direction of an absorbent article is formed, and the joint strength of the said pressing part for division joins the said 2 layer sheet | seat. The absorbent article according to claim 2, wherein the absorbent article is set lower than the bonding strength of the compressed groove.

  In the invention according to claim 3, in the case where the polymer arrangement region is arranged in the form of vertical stripes along the longitudinal direction of the absorbent article, the polymer arrangement region is disposed in the polymer arrangement region in order to prevent bias of the superabsorbent polymer. The compression part for division which divides | segments an area | region into plurality with respect to the longitudinal direction of an absorbent article is formed. Since the compression part for division is set to have a bonding strength lower than the bonding strength of the pressing groove for joining the two-layer sheets, the compression part for division is when the superabsorbent polymer absorbs water and swells. It peels preferentially and the fluidity of the superabsorbent polymer can be secured.

  The present invention according to claim 4 is the absorbent article according to claim 1, wherein the polymer arrangement regions are arranged in a regular lattice pattern or a staggered lattice pattern at intervals in the longitudinal direction and the width direction of the absorbent article. Is provided.

  In the invention of claim 4, since the polymer arrangement regions are arranged in a regular lattice pattern or a staggered lattice pattern at intervals in the longitudinal direction and the width direction of the absorbent article, the longitudinal direction of the absorbent article and The body fluid can permeate well to the lower layer side through the polymer non-arranged region in the width direction.

  As this invention which concerns on Claim 5, while the said pressing groove is formed in the grid | lattice shape along the longitudinal direction and the width direction of an absorbent article, the said polymer arrangement | positioning area | region is provided in the part enclosed by the said pressing groove, and absorption. The absorbent article according to claim 4, wherein a bonding strength of the compressed groove formed along the width direction of the absorbent article is set lower than a bonding strength of the compressed groove formed along the longitudinal direction of the absorbent article. Is provided.

  In the invention according to claim 5, in the case where the polymer arrangement region is arranged in a regular lattice shape or a staggered lattice shape, the compressed groove for joining the two layers of the polymer sheet has the longitudinal direction of the absorbent article and It is formed in a lattice shape along the width direction and the width direction. The polymer arrangement region is provided in a portion surrounded by the pressing groove. And the joint strength of the said pressing groove formed along the width direction of an absorbent article is set lower than the joint strength of the said pressing groove formed along the longitudinal direction of an absorbent article. For this reason, when the superabsorbent polymer in the polymer arrangement region absorbs water and swells, the compressed groove formed along the width direction of the absorbent article peels preferentially, and the swollen superabsorbent polymer is It flows along the longitudinal direction of the absorbent article. Accordingly, diffusion of body fluid along the longitudinal direction of the absorbent article can be promoted.

  As described above in detail, according to the present invention, it is possible to prevent gel blocking while securing a water absorption amount while achieving a reduction in thickness.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. 2 is a partially broken exploded perspective view of a polymer sheet 4. FIG. (A) is a cross-sectional view of a laminated polymer sheet 4 before water absorption, (B) after water absorption, and (C) after further water absorption. It is a top view of the polymer sheet 4 which concerns on a modification. It is an expanded sectional view of the polymer arrangement region 13 part concerning a modification. (A), (B) is a top view of the polymer sheet 4 which concerns on a modification. 3 is a cross-sectional view in which a diffusive sheet 19 is disposed between polymer sheets 4. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, and the like, and a liquid-permeable material that allows menstrual blood and urine to permeate quickly. A surface sheet 3, a polymer sheet 4 having a superabsorbent polymer 12 interposed between two sheets (upper sheet 10 and lower layer sheet 11) interposed between both sheets 2 and 3, and both sides of the surface The side nonwoven fabrics 7 and 7 are arranged along the longitudinal direction. Further, around the absorbent body 4, at the front and rear edge portions in the napkin longitudinal direction, the outer edge portions of the liquid-impervious back sheet 2 and liquid-permeable surface sheet 3 are adhesive such as hot melt, heat seal, etc. The liquid-impervious back sheet 2 and the side nonwoven fabric 7 which are joined by the adhering means and which extend laterally from the side edges of the absorbent body 4 at both side edges thereof are adhesives such as hot melt, Joined by adhesive means such as heat sealing, an outer peripheral flap portion where the polymer sheet 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 the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and having high compression recovery properties. The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. 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 be suitably used.

  The polymer sheet 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is between the upper layer sheet 10 disposed on the skin side and the lower layer sheet 11 disposed on the non-skin side. The superabsorbent polymer 12 is disposed on the surface. Only the superabsorbent polymer 12 is interposed between the upper layer sheet 10 and the lower layer sheet 11 of the polymer sheet 4 and no fibrous absorbent such as pulp is interposed. For this reason, the thickness of the polymer sheet 4 is reduced, and the sanitary napkin 1 can be made thinner. The polymer sheet 4 will be described in detail later.

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

  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 menstrual blood and urine from penetrating or enhancing the feeling of touch, a water-repellent nonwoven fabric coated with a silicone, paraffin, or alkylchromic chloride water repellent may be used. It is desirable to use it. In addition, if importance is attached to menstrual blood and urine absorbability 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 synthetic fiber production process Or by treating the surface with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to make the synthetic fibers swell or porous, applying capillary action to make them hydrophilic It is desirable to use a hydrophilic treated non-woven fabric imparted with properties.

  As shown in FIG. 2, the inner side of the side nonwoven fabric 7 folds the side nonwoven fabric 7 almost double, and inside the double sheet, in the middle in the height direction, as appropriate at both ends or in the longitudinal direction. One or a plurality of, in the illustrated example, two thread-like elastic elastic members 8 and 8 are disposed, and the double sheet portion is erected on the skin side by the contraction force. Is formed.

[About polymer sheet 4]
Hereinafter, the polymer sheet 4 will be described in detail. As the upper layer sheet 10 and the lower layer sheet 11 constituting the polymer sheet 4, a porous or non-porous nonwoven fabric or a porous plastic sheet is used. As the raw material fibers constituting the nonwoven fabric, in the same manner as the liquid-permeable surface sheet 3, for example, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, cotton Natural fibers such as Although the processing method of the said nonwoven fabric is not ask | required, in order to prevent the superabsorbent polymer 12 from dropping off, such as an air-through method, a spunbond method, a melt blown method, a needle punch method, etc. It is preferable to do this. The pore diameter of the porous plastic sheet is preferably smaller than the outer shape of the superabsorbent polymer 12 in order to prevent the superabsorbent polymer 12 from falling off.

  Examples of the superabsorbent polymer 12 include polyacrylate cross-linked products, self-crosslinked polyacrylates, saponified acrylate-vinyl acetate copolymer cross-linked products, and isobutylene / maleic anhydride copolymer cross-linked products. , A crosslinked polysulfonate, and a partially crosslinked water-swellable polymer such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbing polymer having the water-absorbing performance, the water-absorbing force and the water-absorbing speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient.

  The sanitary napkin 1 has a multilayer structure in which a plurality of the polymer sheets 4 are laminated in the thickness direction of the sanitary napkin 1. The example shown in FIG. 2 has a two-layer structure including a polymer sheet 4A disposed on the skin side and a polymer sheet 4B disposed on the non-skin side, but may have a multilayer structure of three or more layers. . As the number of the polymer sheets 4 to be laminated, if the amount is too large, the thickness cannot be reduced and the production takes time, so 2 to 7 layers are preferable, and 2 to 4 layers are more preferable. It is not preferable that the laminated polymer sheets 4 are joined by a hot melt adhesive or the like at a portion where the superabsorbent polymer 12 is interposed, and the laminated polymer sheets 4 are left in a laminated state or the superabsorbent polymer 12 is not interposed. It is preferable to join at a portion, for example, the peripheral edge of the polymer sheet 4. Thereby, it can prevent that the diffusibility and permeability | transmittance of a bodily fluid fall by the said adhesive bond layer.

  Each polymer sheet 4 (4A, 4B) has a structure in which a superabsorbent polymer 12 is interposed between the upper layer sheet 10 and the lower layer sheet 11. Accordingly, the superabsorbent polymer 12 of each layer and the superabsorbent polymer 12 of the adjacent layer are separated by the sheets 10 and 11 of each polymer sheet 4, and the superabsorbent polymers 12 of each layer are in contact with each other. Arranged not to. That is, as shown in FIG. 3, the gap between the superabsorbent polymer 12 arranged on the skin-side polymer sheet 4 </ b> A and the superabsorbent polymer 12 arranged on the non-skin-side polymer sheet 4 </ b> B is on the skin side. The lower layer sheet 11 of the polymer sheet 4A and the upper layer sheet 10 of the non-skin side polymer sheet 4B are separated.

  In the sanitary napkin 1 having the above-described configuration, since the polymer sheet 4 has a multilayer structure, the amount of polymer per layer is ensured if the amount of polymer corresponding to the required amount of water absorption is secured as a whole. Since the total amount of polymer is divided by the number of layers, the amount of polymer per layer can be reduced. Therefore, when the superabsorbent polymer 12 absorbs water and swells, the superabsorbent polymer 12 easily flows between the two sheets 10 and 11 of each layer in the plane direction, and the swollen superabsorbent polymer 12 stays. Thus, gel blocking in which the superabsorbent polymers 12 are bonded to each other is less likely to occur.

  The polymer sheets 4 of each layer are preferably formed with substantially the same outer shape, and are preferably arranged so that the outlines of the polymer sheets 4 of each layer substantially coincide with each other in a laminated state. In the example shown in FIGS. 1 and 3, the planar shape of the polymer sheet 4 is formed in a rectangular shape that is long in the longitudinal direction of the sanitary napkin 1, but the physiological shape such as an ellipse, an oval, an oval, an hourglass, etc. It can be formed in a known outer shape as an absorber used for a medical napkin.

  In the sanitary napkin 1, each polymer sheet 4 is formed with a polymer arrangement region 13 where the superabsorbent polymer 12 is arranged and a polymer non-arrangement region 14 where the superabsorbent polymer 12 is not arranged. The polymer arrangement region 13 is a region where the superabsorbent polymer 12 is interposed between the two layers 10 and 11 with a predetermined basis weight or more. The polymer non-arrangement region 14 is a region other than the polymer arrangement region 13 adjacent to the polymer arrangement region 13, and the superabsorbent polymer 12 does not intervene between the two sheets 10 and 11, or the polymer arrangement Although the superabsorbent polymer 12 is slightly present due to spilling or the like when the superabsorbent polymer 12 is sprayed on the region 13, the amount thereof is an extremely small region as compared with the polymer arrangement region 13. The polymer arrangement region 13 is arranged in an intermediate region between the upper layer sheet 10 and the lower layer sheet 11 that does not reach the outer edges of the upper layer sheet 10 and the lower layer sheet 11.

  Moreover, in this sanitary napkin 1, in the state before water absorption shown in FIG. 4 (A), between each of the polymer sheets 4, 4 (4A, 4B) adjacent to each other in the laminating direction, The provided polymer arrangement regions 13 and 13 are provided at positions that do not overlap in the thickness direction of the sanitary napkin 1. That is, all of the polymer arrangement regions 13 provided on the skin-side polymer sheet 4A are positions that do not overlap with the polymer arrangement region 13 provided on the non-skin-side polymer sheet 4B in the thickness direction of the napkin. All of the non-skin-side polymer arrangement regions 13 are provided in positions overlapping with the arrangement region 14 and are not overlapped with the polymer arrangement region 13 provided on the skin-side polymer sheet 4A in the thickness direction of the napkin. It is provided at a position overlapping the non-arranged region 14. The polymer non-arrangement region 14 of each layer partially overlaps the polymer arrangement region 13 of the polymer sheet 4 adjacent in the stacking direction in the thickness direction of the napkin, and the remaining part of the polymer sheet 4 adjacent in the stacking direction. It is preferably provided so as to overlap the polymer non-arranged region 14.

  When the polymer sheet 4 has a multilayer structure in which three or more layers are laminated, the two polymer layers adjacent to each other in the laminating direction are used to prevent the polymer arrangement regions 13 and 13 from overlapping each other in the thickness direction of the napkin. It may be made only between the sheets 4, 4, or may be made between three or more polymer sheets 4, 4. For example, in the case of a three-layer structure in which three polymer sheets 4 are laminated, the polymer arrangement regions 13 and 13 of the first layer and the second layer, and the second layer and the third layer from the skin side are respectively As long as it is provided so as not to overlap in the thickness direction of the napkin, the polymer arrangement regions 13 and 13 of the first layer and the third layer may be provided at positions where they overlap each other in the thickness direction of the napkin. You may be provided in the position which should not be. In the case of the former, there exists an advantage which can form the polymer arrangement | positioning area | region 13 of the polymer sheet 4 of the 1st layer and the 3rd layer with the same pattern.

The basis weight of the superabsorbent polymer 12 arranged in the polymer arrangement region 13 is 10 to 300 g / m 2 , preferably 30 to 100 g / m 2 . The basis weight of the superabsorbent polymer 12 may be constant in the plurality of polymer arrangement regions 13 provided in each polymer sheet 4 or may be different depending on the part. Moreover, it is good also as the polymer sheet 4 laminated | stacked in multiple numbers, and you may make it differ in each layer. For example, by making the polymer sheet 4 of the non-skin side layer gradually higher than the skin side layer, when the superabsorbent polymer 12 absorbs water and swells, the bulge toward the skin side may be kept low. .

  As shown in FIG. 3, in each polymer sheet 4, the upper layer sheet 10 and the lower layer sheet 11 are joined by a compressed groove 15 formed in a portion where the superabsorbent polymer 12 is not disposed, and the upper layer The sheet 10 and the lower layer sheet 11 are joined by an outer peripheral seal portion 16 provided at the peripheral edge portion. Further, it is preferable that the superabsorbent polymer 12 is disposed at least in a portion partitioned by the pressing groove 15. As a result, when the superabsorbent polymer 12 is disposed between the upper layer sheet 10 and the lower layer sheet 11, the pressing groove 15 can be used without fixing the base sheet or the polymers with an adhesive or the like. The superabsorbent polymer 12 can be fixed in the partitioned area. Accordingly, it is possible to prevent a decrease in the permeability and diffusibility of body fluids that occur when fixed with an adhesive or the like, and it is possible to ensure the fluidity of the polymer when the superabsorbent polymer 12 absorbs water and swells, Gel blocking is less likely to occur.

  The pressing groove 15 is a seal portion in which the upper layer sheet 10 and the lower layer sheet 11 are pressed together and fused by heat or ultrasonic waves. Embossing for joining the upper layer sheet 10 and the lower layer sheet 11 may be performed from the upper layer sheet 10 side or from the lower layer sheet 11 side, but the diffusibility of the body fluid that has flowed into the pressing groove Is preferably performed from the upper sheet 10 side. The compressed groove 15 can be provided in the vicinity of the polymer arrangement region 13 continuously or intermittently. In the example shown in FIG. 3, continuous linear squeezing grooves along the longitudinal direction of the sanitary napkin 1 are respectively provided on both sides of the polymer arrangement region 13 provided in a strip shape along the longitudinal direction of the sanitary napkin 1. 15 is formed, and the front and rear end portions of the linear compressed groove 15 are connected to the outer peripheral seal portion 16, respectively. As a result, the superabsorbent polymer 12 is partitioned on both sides in the longitudinal direction of the sanitary napkin 1 by the compressed grooves 15, and both ends in the longitudinal direction of the sanitary napkin 1 are partitioned by the outer peripheral seal portion 16. Enclosed in the area.

  The said pressing groove 15 is good also as a continuous line in which the continuous pressing groove was formed as FIG. 3 shows, and good also as an intermittent line in which the pressing part and the non-squeezing part were formed in multiple numbers alternately. In order to prevent the superabsorbent polymer 12 from moving through the non-squeezed part, the length of the non-squeezed part in the case of the intermittent line (the distance between adjacent compressed parts) is 0.5 to It is preferably about 5 mm.

  The outer peripheral seal portion 16 is a seal portion in which the upper layer sheet 10 and the lower layer sheet 11 are bonded by adhesion using an adhesive such as hot melt, welding by heat sealing, ultrasonic sealing, or a combination thereof. The outer peripheral seal portion 16 is a linear seal portion that is provided continuously or intermittently along the circumferential direction slightly inside the outer edges of the upper layer sheet 10 and the lower layer sheet 11.

  The upper layer sheet 10 and the lower layer sheet 11 are not joined except the compressed groove 15 and the outer peripheral seal portion 16, and the upper layer sheet 10 and the lower layer sheet 11 are merely laminated in the polymer non-arranged region 14. Is preferred. Thereby, it becomes possible to prevent the diffusibility and permeability of the body fluid in the polymer non-arranged region 14 from being lowered by the hot melt adhesive or the like.

  As shown in FIG. 3, the compressed groove 15 and the outer peripheral seal portion 16 may be provided so as to be connected to each other, or may be provided so as to be separated from each other although not illustrated. In order to prevent the superabsorbent polymer 12 from moving through the separation portion, the separation distance in the case of separation is preferably about 0.5 to 8 mm.

  The bonding strength of the compressed groove 15 is such that all or part of the pressing groove 15 can be peeled off by the force acting in the direction in which the upper layer sheet 10 and the lower layer sheet 11 are separated when the superabsorbent polymer 12 absorbs water and swells. Is preferable. Further, the bonding strength of the outer peripheral seal portion 16 should be such that it does not peel off due to the force acting in the direction in which the upper layer sheet 10 and the lower layer sheet 11 are separated when the superabsorbent polymer 12 absorbs water and swells. preferable. That is, it is preferable that the bonding strength of the compressed groove 15 is set lower than the bonding strength of the outer peripheral seal portion 16. Accordingly, when the superabsorbent polymer 12 absorbs water and swells, the swollen superabsorbent polymer 12 can flow to a region outside the pressing groove 15, and the swollen superabsorbent polymers 12 are in contact with each other. Can prevent gel blocking of binding.

  The bonding strength of the compressed groove 15 is preferably about 0.2 to 2 N / 25 mm. The measurement of the bonding strength can be obtained from the tensile strength when a tensile test is performed in which the sheet material bonded by the bonding portion cut to a width of 25 mm is pulled at a speed of 300 mm / min.

  As shown in FIG. 3, the polymer arrangement region 13 preferably extends in the longitudinal direction of the sanitary napkin 1 and is arranged in parallel at intervals in the width direction. By arranging in a longitudinal stripe pattern extending in the longitudinal direction in this way, diffusion of body fluid along the polymer placement region 13 is likely to occur in the longitudinal direction of the sanitary napkin 1 so that side leakage of body fluid can be prevented. Become. Further, since the compressed groove 15 is formed so as to extend in the longitudinal direction of the sanitary napkin 1, the flow of body fluid along the compressed groove 15 is likely to occur in the longitudinal direction of the sanitary napkin 1.

  As shown in FIG. 3, the width S1 of the polymer arrangement region 13 formed in a band-like pattern extending in the longitudinal direction of the napkin is equal to the width S2 of the polymer non-arrangement region 14 (the separation width between the adjacent polymer arrangement regions 13 and 13). It is preferable to form with a smaller width. Thereby, when the polymer arrangement | positioning area | region 13 of the polymer sheet 4A of the skin side and the polymer arrangement | positioning area | region 13 of the polymer sheet 4B of the non-skin side are formed in substantially equal width, the polymer arrangement | positioning area | regions 13 and 13 are the thickness directions of a napkin It will be provided without overlapping.

  The width S1 of the polymer arrangement region 13 is preferably about 5 to 10 mm. The width S2 of the polymer non-arranged region 14 is preferably about 7 to 20 mm. The width S <b> 1 of the polymer arrangement region 13 may be set so that all of the plurality of polymer arrangement regions 13 provided in each polymer sheet 4 have a constant size, or may vary depending on the position. For example, in order to increase the amount of the superabsorbent polymer 12 provided in the central portion in the width direction, the width of the polymer arrangement region 13 in this portion can be increased. Further, the width S1 of the polymer arrangement region 13 may be a constant dimension for all the polymer sheets 4, or may be different for each polymer sheet 4. For example, the width of the polymer arrangement region 13 of the polymer sheet 4 arranged on the non-skin side can be gradually reduced from the skin side in order to suppress the bulge to the skin side due to the swelling of the superabsorbent polymer 12. The wider side of the polymer arrangement region 13 on the skin side is leveled over a wide range in the surface direction when the superabsorbent polymer 12 absorbs water and swells, so that the bulge toward the skin side can be suppressed.

  In addition, the number of the polymer arrangement regions 13 provided in each polymer sheet 4 is preferably 2 to 10, more preferably 2 to 5. If the number is less than 2, the amount of the superabsorbent polymer 12 disposed per one portion of the polymer disposition region 13 increases, and the fluidity of the superabsorbent polymer 12 that has swollen due to water absorption may decrease. On the other hand, when the number is more than 10, the distance between the polymer arrangement regions 13 becomes narrow and the manufacture becomes difficult.

  In a state where a plurality of the polymer sheets 4 are laminated, the polymer arrangement region 13 of the polymer sheet 4 in a certain layer and the polymer arrangement region adjacent to the polymer arrangement region 13 in a plan view in the polymer sheet 4 adjacent thereto. The separation width with respect to 13 is preferably about 1 to 10 mm. If the separation width is smaller than 1 mm, the polymer arrangement regions 13 and 13 may overlap with each other in the thickness direction of the napkin due to the bias of the superabsorbent polymer 12, and if larger than 10 mm, the superabsorbent polymer 12 and body fluid , The body fluid is less likely to be absorbed by the superabsorbent polymer 12.

  The procedure for absorbing body fluid by the polymer sheet 4 having the above configuration will be described with reference to FIG. 4A is a cross-sectional view of the laminated polymer sheet 4 before water absorption, FIG. 4B is a cross-sectional view of the laminated polymer sheet 4 after water absorption, and FIG. 4C is a cross-sectional view of the laminated polymer sheet 4 after further water absorption. FIG. As shown in FIG. 4 (A), since the polymer arrangement regions 13 are provided at positions where the laminated polymer sheets 4A and 4B do not overlap with each other in the thickness direction of the napkin, In the polymer sheet 4A, the non-skin-side polymer is absorbed in contact with the superabsorbent polymer 12 in the polymer arrangement region 13 and permeates the non-skin side while diffusing the polymer non-arrangement region 14 in the plane direction. The sheet 4B comes into contact with the superabsorbent polymer 12 in the polymer arrangement region 13 and is absorbed.

  Further, the superabsorbent polymer 12 which has swollen after absorbing water flows in a plane direction between the upper layer sheet 10 and the lower layer sheet 11 and spreads in a region surrounded by the compressed grooves 15 (FIG. 4). (B)). In this state, as shown in FIG. 4 (B), the superabsorbent polymer 12 absorbs water and swells, so that the gap between the polymer particles is reduced and the liquid permeability of the polymer arrangement region 13 is lowered. As shown by the arrows in the figure, the body fluid that has passed through the polymer non-arranged region 14 of the polymer sheet 4A on the skin side is between the superabsorbent polymer 12 on the skin side and the superabsorbent polymer 12 on the non-skin side. The laminated portion of the upper layer sheet 10 and the lower layer sheet 11 interposed in the sheet is diffused to reach the non-skin side polymer sheet 4B. Therefore, the water absorption / diffusibility of the body fluid does not decrease, and gel blocking hardly occurs.

  When the water absorption further proceeds, as shown in FIG. 4C, the compressed groove 15 is released by the pressure of the swollen superabsorbent polymer 12, and the superabsorbent polymer 12 is a two-layer sheet 10 of each polymer sheet 4. , 11 further flows in the plane direction so that most of the polymer non-arranged region 14 is filled with the superabsorbent polymer 12. Even in this state, since the body fluid diffuses through the laminated portion of the lower layer sheet 11 and the upper layer sheet 10 of each polymer sheet 4, the water absorption / diffusibility of the body fluid does not decrease, and gel blocking hardly occurs.

  When the band-shaped polymer arrangement region 13 extending in the longitudinal direction of the sanitary napkin 1 is formed as described above, the polymer arrangement region 13 is partitioned into a plurality of portions in the longitudinal direction of the sanitary napkin 1 as shown in FIG. It is preferable to form the compression part 17 for division. By providing the squeezing part 17 for partitioning, it is possible to prevent the superabsorbent polymer 12 from moving and being biased when the product is transported or mounted. The partitioning squeezing portion 17 does not completely partition the polymer arrangement region 13 in the longitudinal direction, but, as shown in FIG. 5, the width of the polymer arrangement region 13 is greater than the width of the polymer arrangement region 13. It is preferable to form by pressing parts, such as a linear form and a dot form, which have a small length. Thereby, it can prevent that the spreading | diffusion of the bodily fluid along the polymer arrangement | positioning area | region 13 is suppressed by the said pressing part 17 for division.

  Moreover, it is preferable to set the joint strength of the division pressing part 17 to be lower than the joint strength of the pressing groove 15 that joins the upper layer sheet 10 and the lower layer sheet 11. Thereby, when the superabsorbent polymer 12 absorbs water and swells, the compressed portion 17 for partitioning is peeled preferentially, and the fluidity of the superabsorbent polymer 12 is inhibited by the compressed portion 17 for partitioning. Can be prevented.

On the other hand, as another means for preventing the bias of the superabsorbent polymer 12, as shown in FIG. 6, the superabsorbent polymer that has absorbed about 5% of the maximum water absorption amount of the superabsorbent polymer 12 in advance. The layer 18 can be provided on the non-skin side of the superabsorbent polymer 12. By providing the water-absorbing polymer layer 18, it is possible to prevent the high water-absorbing polymer 12 from moving before water absorption, and the high water-absorbing polymer 12 is less likely to be biased. The basis weight of the water-absorbing polymer layer 18 is 5 to 100 g / m 2 , preferably about 5 to 10 g / m 2 .

  As another pattern of the polymer arrangement region 13, as shown in FIG. 7, the polymer arrangement region 13 ′ has a regular lattice shape with an interval in the longitudinal direction and the width direction of the sanitary napkin 1 (see FIG. )) Or a staggered pattern (FIG. 7B). In FIG. 7, the polymer sheet 4 has a two-layer structure, the polymer arrangement region 13 ′ disposed on the skin-side polymer sheet 4 is indicated by a solid line, and the polymer arrangement region 13 ′ disposed on the non-skin-side polymer sheet 4. Is indicated by a dotted line. In FIG. 7A, each of the polymer sheet 4 on the skin side and the non-skin side is provided with a polymer arrangement region 13 ′ arranged in a regular lattice shape, and four adjacent polymer arrangements of the polymer sheet 4 on the skin side are provided. It arrange | positions so that the polymer arrangement | positioning area | region 13 'of the said non-skin side polymer sheet 4 may be located in the center of area | region 13'. On the other hand, in FIG. 7 (B), the polymer sheet 4 on the skin side and the non-skin side is provided with polymer arrangement regions 13 ′ arranged in a staggered pattern, respectively. It arrange | positions so that the polymer arrangement | positioning area | region 13 'of the said non-skin side polymer sheet 4 may be located in the center of one polymer arrangement | positioning area | region 13'. The polymer arrangement region 13 'is formed in a circular shape in the illustrated example, but can be formed in an arbitrary shape such as a rectangular shape or an elliptical shape.

  By arranging the polymer arrangement region 13 ′ in a regular lattice shape or a staggered lattice shape, the body fluid is good to the lower layer side through the polymer non-arrangement region 14 in the longitudinal direction and the width direction of the sanitary napkin 1. Will be able to penetrate.

  Even in the form in which the polymer arrangement regions 13 ′ are arranged in a lattice shape, the two layers of sheets 10 and 11 are joined by the compressed grooves 15 formed in a portion where the superabsorbent polymer 12 is not arranged. In this embodiment, the compressed grooves 15 are formed in a lattice shape along the longitudinal direction and the width direction of the sanitary napkin 1, and the polymer arrangement region 13 ′ is provided in a portion surrounded by the compressed grooves 15. Can be. The joint strength of the compressed grooves 15 at this time may be all constant, but the joint strength of the compressed grooves 15 a formed along the width direction of the sanitary napkin 1 is formed along the longitudinal direction of the sanitary napkin 1. It is preferable to set it lower than the bonding strength of the compressed groove 15b. By making the bonding strength of the compressed groove 15a lower than the bonding strength of the compressed groove 15b, when the superabsorbent polymer 12 in the polymer arrangement region 13 ′ absorbs water and swells, it follows the width direction of the sanitary napkin 1. The compressed groove 15 a formed in this manner is preferentially peeled off, and the swollen superabsorbent polymer 12 is likely to flow along the longitudinal direction of the sanitary napkin 1. Along with this, diffusion of body fluid along the longitudinal direction of the sanitary napkin 1 can be promoted.

  In order to produce the polymer sheet 4, the superabsorbent polymer 12 is sprayed on a predetermined region of the lower layer sheet 11, coated with the upper layer sheet 10, and then passed between the embossing rolls to allow the pressing groove 15 and as necessary. The outer peripheral seal portion 16 is applied.

[Other examples]
(1) As shown in FIG. 8, a diffusible sheet 19 made of a hydrophilic nonwoven fabric or crepe paper may be disposed between the polymer sheets 4 and 4 having a multilayer structure. By disposing the diffusive sheet 19, body fluid can easily diffuse between the polymer sheets 4 and 4.
(2) Although not shown, a fiber assembly layer made of pulp or the like may be provided adjacent to the non-skin side of the polymer sheet 4 having a multilayer structure. Thereby, the body fluid which permeate | transmitted the said polymer sheet 4 to the non-skin side can be absorbed now by the said fiber assembly layer.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Polymer sheet, 7 ... Side nonwoven fabric, 8 ... Filament elastic elastic member, 10 ... Upper layer sheet, 11 ... Lower layer sheet, DESCRIPTION OF SYMBOLS 12 ... Super absorbent polymer, 13 ... Polymer arrangement | positioning area | region, 14 ... Polymer no arrangement | positioning area | region, 15 ... Squeeze groove, 16 ... Outer periphery seal part, 17 ... Squeeze part for division

Claims (5)

  1. An absorbent article comprising a polymer sheet in which a superabsorbent polymer is interposed between two layers of sheets,
    The polymer sheet has a multilayer structure in which a plurality of the polymer sheets are laminated, and each polymer sheet is formed with a polymer arrangement region in which the superabsorbent polymer is arranged and a polymer non-arrangement region in which the superabsorbent polymer is not arranged, At least between the polymer sheets adjacent to each other in the laminating direction, the compressed grooves formed in a portion where the polymer arrangement regions do not overlap in the thickness direction and the two-layer sheets are not arranged with the superabsorbent polymer Absorbent article characterized by being joined by.
  2.   The absorbent article according to claim 1, wherein the polymer arrangement regions extend in the longitudinal direction of the absorbent article and are arranged in parallel at intervals in the width direction.
  3.   A partition pressing part for partitioning the polymer arrangement region into a plurality of longitudinal directions of the absorbent article is formed, and the bonding strength of the partition pressing part is set lower than the bonding strength of the pressing groove for bonding the two layers of sheets. The absorbent article according to claim 2.
  4.   2. The absorbent article according to claim 1, wherein the polymer arrangement regions are arranged in a regular lattice pattern or a staggered lattice pattern with a gap in a longitudinal direction and a width direction of the absorbent article.
  5.   The compressed groove is formed in a lattice shape along the longitudinal direction and the width direction of the absorbent article, and the polymer arrangement region is provided in a portion surrounded by the compressed groove, and is formed along the width direction of the absorbent article. The absorbent article according to claim 4, wherein a bonding strength of the compressed groove formed is set lower than a bonding strength of the compressed groove formed along the longitudinal direction of the absorbent article.
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JP2004313580A (en) * 2003-04-18 2004-11-11 Livedo Corporation Disposable absorbent article
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JP2010529879A (en) * 2007-06-18 2010-09-02 ザ プロクター アンド ギャンブル カンパニー Disposable absorbent article with an improved capture system having a substantially continuously distributed absorbent particulate polymer material
JP3172565U (en) * 2010-10-13 2011-12-22 ロマノヴァ ベーフェーべーアー スターター Absorption structure
JP2014518749A (en) * 2011-06-10 2014-08-07 ザ プロクター アンド ギャンブル カンパニー Laminated absorbent core for use in absorbent articles

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JPS61204726U (en) * 1985-06-14 1986-12-24
JPH1142251A (en) * 1997-07-24 1999-02-16 Oji Paper Co Ltd Absorbing product
JP2004313580A (en) * 2003-04-18 2004-11-11 Livedo Corporation Disposable absorbent article
JP2010529879A (en) * 2007-06-18 2010-09-02 ザ プロクター アンド ギャンブル カンパニー Disposable absorbent article with an improved capture system having a substantially continuously distributed absorbent particulate polymer material
JP2010104523A (en) * 2008-10-29 2010-05-13 Uni Charm Corp Liquid absorbing structure of wearing article
JP3172565U (en) * 2010-10-13 2011-12-22 ロマノヴァ ベーフェーべーアー スターター Absorption structure
JP2014518749A (en) * 2011-06-10 2014-08-07 ザ プロクター アンド ギャンブル カンパニー Laminated absorbent core for use in absorbent articles

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WO2019065025A1 (en) * 2017-09-29 2019-04-04 大王製紙株式会社 Absorbent sheet, and disposable wearable article including absorbent sheet

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