WO2015012399A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2015012399A1 WO2015012399A1 PCT/JP2014/069743 JP2014069743W WO2015012399A1 WO 2015012399 A1 WO2015012399 A1 WO 2015012399A1 JP 2014069743 W JP2014069743 W JP 2014069743W WO 2015012399 A1 WO2015012399 A1 WO 2015012399A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- superabsorbent polymer
- layer
- sheet
- nonwoven fabric
- liquid
- Prior art date
Links
- 239000002250 absorbent Substances 0.000 title claims abstract description 52
- 230000002745 absorbent Effects 0.000 title claims abstract description 51
- 238000010521 absorption reaction Methods 0.000 claims abstract description 54
- 239000006096 absorbing agent Substances 0.000 claims abstract description 37
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 35
- 229920000642 polymer Polymers 0.000 claims abstract description 22
- 238000004049 embossing Methods 0.000 claims abstract description 9
- 229920000247 superabsorbent polymer Polymers 0.000 claims description 94
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000002504 physiological saline solution Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 7
- 241001122767 Theaceae Species 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 230000000704 physical effect Effects 0.000 claims description 5
- 239000004677 Nylon Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 210000001124 body fluid Anatomy 0.000 abstract description 30
- 239000010839 body fluid Substances 0.000 abstract description 25
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 21
- 238000000034 method Methods 0.000 description 16
- -1 polyethylene Polymers 0.000 description 15
- 239000004698 Polyethylene Substances 0.000 description 8
- 239000011230 binding agent Substances 0.000 description 8
- 239000012530 fluid Substances 0.000 description 8
- 238000002844 melting Methods 0.000 description 8
- 229920000573 polyethylene Polymers 0.000 description 8
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 206010021639 Incontinence Diseases 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000007666 vacuum forming Methods 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 241000692870 Inachis io Species 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000002998 adhesive polymer Substances 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002175 menstrual effect Effects 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000955 prescription drug Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Images
Classifications
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Definitions
- the present invention relates to a thin absorbent sanitary napkin, panty liner, incontinence pad and the like using an airlaid pulp nonwoven fabric as an absorbent.
- a cotton-like shape is formed between a liquid-impermeable 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.
- a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet laminated nonwoven fabric
- a liquid-permeable surface sheet such as a nonwoven fabric.
- a micro-opened polymer web (hereinafter referred to as a three-dimensional aperture mesh sheet) showing a soft silk-like feel is disclosed in Patent Document 1 below.
- this mesh sheet is a micro-opened polymer web 110 having a soft silk-like touch on at least one surface.
- the silk-like touch surface of the web is formed between the web and the eyes of an observer.
- the vertical distance between them is at least about 30.5 cm (12 inches)
- a pattern of discontinuous surface deformations 120 with top openings that are not individually identifiable to the normal eye is shown.
- At least one minute opening 125 is formed at the end of each surface deformation portion 120 substantially coincident with the maximum height point, and has a height substantially perpendicular to the surface on which the surface deformation portion 120 is formed.
- the openings 125 are relatively thin irregularities that reduce the compression and shear resistance of each of the surface deformations 120 and the degree of contact with the viewer's skin so that the web feel is generally soft and silky.
- a fine crater-like opening with a petal-like part It is an opening of polymeric web.
- the bottom surfaces of these macroscopic debosses are formed. It is disclosed that the fluid passage hole is an opening (see FIG. 7 of the same document).
- Patent Document 1 in order to cause the absorbent body to quickly absorb bodily fluid so that the bodily fluid does not remain on the upper surface of the three-dimensionally open mesh sheet, in the Patent Document 1, forming macroscopic debosses separately from the micro openings, and Although it is described that the bottom surface of these macroscopic debosses is an opening as a fluid passage hole, in the case of an airlaid absorber with an increased amount of the superabsorbent polymer, the superabsorbent polymer deviates from the fluid passage hole. There is.
- the main problem of the present invention is that in the absorbent article according to the combination of the three-dimensional aperture mesh sheet and the airlaid absorbent, the three-dimensional aperture mesh sheet has a relatively open area that is separate from the micropores. It is possible to quickly absorb the body fluid on the upper surface of the three-dimensional open mesh sheet without forming a large fluid passage hole, and to increase the body fluid absorption amount of the absorber, and also to absorb a high amount. It is intended to prevent gel blocking due to an adhesive polymer, bias, deviation and loss of shape of the superabsorbent polymer.
- the liquid-permeable surface sheet uses a three-dimensional aperture mesh sheet in which a large number of minute projections projecting to the skin side are formed and a top surface of these minute projections is opened.
- the absorbent body has an airlaid absorption of a five-layer structure of an airlaid pulp nonwoven fabric layer, a superabsorbent polymer A layer, an airlaid pulp nonwoven fabric layer, a superabsorbent polymer B layer, and an airlaid pulp nonwoven fabric layer in order from the liquid-permeable surface sheet side.
- the superabsorbent polymer constituting the superabsorbent polymer A layer has a property value with a relatively higher absorption rate than the superabsorbent polymer constituting the superabsorbent polymer B layer.
- the superabsorbent polymer constituting the superabsorbent polymer B layer has a physical property value having a relatively higher absorption capacity than the superabsorbent polymer constituting the superabsorbent polymer A layer.
- the liquid-permeable surface sheet As the liquid-permeable surface sheet, a large number of minute convex portions protruding to the skin side are formed, and a three-dimensional aperture mesh sheet having the top surfaces of these minute convex portions as openings is provided. Used, a number of recesses that are recessed on the non-skin surface side are formed by mechanical embossing on the three-dimensionally open mesh sheet.
- the discharged body fluid passes through the minute holes and moves to the absorber side.
- the concave portion temporarily serves as a tank, the body fluid easily flows out from the minute holes.
- the body fluid since the body fluid is relatively quickly removed from the portion of the convex portion, the feeling of wetness to the skin is also eliminated early.
- the superabsorbent polymer does not deviate outside.
- the absorber is an airlaid absorption of a five-layer structure of an airlaid pulp nonwoven fabric layer, a superabsorbent polymer A layer, an airlaid pulp nonwoven fabric layer, a superabsorbent polymer B layer, and an airlaid pulp nonwoven fabric layer in order from the liquid-permeable surface sheet side.
- the superabsorbent polymer A layer has a property value with a relatively high absorption rate
- the superabsorbent polymer B layer has a property value with a relatively high absorption capacity. ing.
- the body fluid that has flowed in from the top sheet can be quickly drawn into the absorber. Moreover, even if the body fluid is a thin air laid absorber by the superabsorbent polymer B layer, a lot of body fluid can be retained, and the amount of absorption can be increased. Since the superabsorbent polymer is divided into the A layer and the B layer and arranged in layers, the superabsorbent polymer is not arranged unevenly, and it is difficult to cause a loss of shape.
- the superabsorbent polymer constituting the superabsorbent polymer A layer has an absorption rate of less than 40 (s) according to the following ⁇ Water absorption rate test>. .
- ⁇ Water absorption rate test> (1) Place 50 ml of physiological saline and a stirrer chip in a 100 ml beaker, and place the beaker on a magnetic stirrer. (2) Adjust the rotation speed of the magnetic stirrer to 600 ⁇ 60 times, generate vortex in physiological saline, and quickly add 2.0 g to the beaker. (3) Using a stopwatch, measure the time (s) from the addition of the polymer to the point of time when the vortex on the liquid surface converges to obtain the absorption rate (s).
- the water absorption rate characteristic of the superabsorbent polymer constituting the superabsorbent polymer A layer is defined numerically.
- the superabsorbent polymer constituting the superabsorbent polymer B layer has a water absorption of 70 (g) or more according to the following ⁇ Water Absorption Test>.
- the absorbent article as described.
- ⁇ Water absorption test> (1) Place 0.5 g of polymer in a tea bag (200 mesh nylon bag) and 100 ml of physiological saline in a 200 ml beaker. (2) Immerse for 30 minutes, hang for 5 minutes after immersion, drain the water, and measure the mass Wa (g). (3) The same operation is performed on a tea bag without a polymer, and the mass Wb (g) is measured. (4) The amount of water absorption (g) is obtained from Wa (g) -Wb (g) / mass of polymer (g).
- the invention according to claim 3 numerically defines the water absorption characteristics of the superabsorbent polymer constituting the superabsorbent polymer B layer.
- an absorbent article according to any one of claims 1 to 3, wherein an air-through nonwoven fabric is interposed between the liquid-permeable surface sheet and the absorbent body.
- body fluid is easily transferred to the absorber side by interposing an air-through nonwoven fabric between the liquid-permeable surface sheet and the absorber. That is, when an air-through nonwoven fabric that tends to be bulky is used as the second sheet, a gap is not formed between the liquid-permeable surface sheet and the absorbent body, and continuity is ensured, so that the body fluid easily moves to the absorbent body side.
- the absorbent body has a basis weight of 150 to 200 g / m 2 , and the blending weight of the superabsorbent polymer with respect to the total weight of the absorbent body is 30 to 50% by weight.
- the weight ratio of the superabsorbent polymer constituting the absorbent polymer A layer to the superabsorbent polymer constituting the superabsorbent polymer B layer is 1 to 1.5, and the total thickness is 2 mm or less. 4.
- An absorbent article according to any one of 4 is provided.
- the basis weight of the absorber is desirably 150 to 200 g / m 2
- the blending weight of the superabsorbent polymer with respect to the total weight of the absorber is desirably 30 to 50% by weight.
- the weight ratio of the superabsorbent polymer constituting the superabsorbent polymer A layer to the superabsorbent polymer constituting the superabsorbent polymer B layer is 1 to 1.5, and both are arranged in the same amount.
- the superabsorbent polymer constituting the superabsorbent polymer A layer is disposed in a slightly larger amount within 100 to 150% by weight in order to increase the absorbability of body fluid.
- the thickness of the absorber is preferably 2 mm or less.
- the three-dimensionally-opened mesh sheet is relatively open, apart from the micropores. Without forming a fluid passage hole having a large area, the body fluid on the upper surface of the three-dimensionally open mesh sheet can be quickly absorbed by the absorbent body, and the body fluid absorption amount of the absorbent body can be increased. Furthermore, it is possible to prevent gel blocking due to the superabsorbent polymer, unevenness of the superabsorbent polymer, deviation and loss of shape.
- FIG. 6 is a perspective view of a main part of a three-dimensionally open mesh sheet 110 according to a conventional example.
- the sanitary napkin 1 is mainly used for applications such as panty liners, sanitary napkins, and incontinence pads.
- a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like
- a liquid-permeable surface sheet 3 that allows permeation of menstrual blood, cages, etc.
- an airlaid absorber 4 interposed between the two sheets 2 and 3
- a crepe paper such as a tissue surrounding the absorber 4 5 and a second sheet 6 disposed between the liquid-permeable surface sheet 3 and the absorbent body 4.
- the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 are bonded by a bonding means such as a hot melt adhesive.
- the crepe paper 5 may be omitted.
- 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.
- 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.
- 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.
- the liquid-permeable surface sheet 3 is formed with a large number of minute convex portions 7, 7... Projecting toward the skin side, and the top surfaces of these minute convex portions 7, 7.
- a three-dimensional aperture mesh sheet 3A having a three-dimensional surface structure (three-dimensional micropores) having holes 8, 8...
- a plurality of concave portions 9, 9... Recessed on the non-skin surface side are used.
- the diameter of the minute convex portions 7, 7... Of the three-dimensional aperture mesh sheet 3A is 0.1 to 0.3 mm, preferably 0.13 to 0.27 mm, and the height is 0.05 to 0.4 mm.
- the thickness is preferably 0.15 to 0.3 mm.
- the interval between the minute projections 7, 7,... Is 0.3 to 0.7 mm.
- the hole forming method can be formed by a method such as hydroforming (high pressure liquid jet), vacuum forming, needle punching or the like. Of these hole forming methods, it is desirable to employ hydroforming (high pressure liquid jet) and vacuum forming in that the periphery of the micropores becomes fluffy (petal shape).
- the hydroforming impinges a high-pressure liquid jet on the exposed surface of a flat polymer film web when the film is supported on a fine mesh woven wire support or on a support with a large number of micropores.
- the three-dimensional micropores are formed by forming the three-dimensional micropores, and the vacuum forming is performed while the film is on the fine mesh woven wire support member or on the support body on which a large number of micropores are formed.
- This is a method in which a three-dimensional micropore is formed by suctioning from the side and applying a vacuum pressure to suck the film into the micropore, inflating the film in the micropore, and finally rupturing at the tip.
- an olefin-based or polyester-based film such as polyethylene or polypropylene is preferably used.
- the basis weight of the film is desirably 20 to 30 g / m 2 .
- a large number of recesses 9, 9... Recessed on the non-skin surface side are formed on the three-dimensional aperture mesh sheet 3 ⁇ / b> A by mechanical embossing.
- the mechanical embossing process allows the three-dimensionally apertured mesh sheet 3A to pass between an embossing roll formed with a large number of convex portions and an anvil roll formed with concave portions corresponding to the convex portions.
- a large number of recesses 9, 9... Recessed on the side are formed.
- the recesses 9, 9... May be arranged in a grid pattern or a staggered pattern.
- the shape of the recess may be such that the cross-sectional shape between the embosses is an arc, and the inverted conical recesses 9, 9... However, as shown in FIG. 3B, recesses 9, 9... Recessed in a circular or elliptical shape may be formed.
- the air-laid absorbent body 4 of the present invention has an air-laid pulp nonwoven fabric layer 10 ⁇ / b> A, a superabsorbent polymer A layer 12, an air-laid pulp nonwoven fabric layer 10 ⁇ / b> B, a superabsorbent in order from the liquid-permeable surface sheet 3 side.
- the air-laid absorbent body has a five-layer structure of the conductive polymer B layer 13 and the air-laid pulp nonwoven fabric layer 10C.
- the airlaid nonwoven fabric 10A to 10C is an airlaid method in which fibers of a predetermined length are defibrated and transported in a flow of air, passed through a screen having a wire mesh or pores, and then dropped and deposited on a wire mesh.
- a sheet-like absorbent body formed by forming a web and thermally bonding the intersections of the fibers in the web with binder fibers, or bonding the fiber intersections with an emulsion binder.
- fibers constituting the air-laid pulp nonwoven fabric short fibers of thermoplastic fibers are used in addition to pulp fibers.
- thermoplastic fiber examples include polypropylene, low density polyethylene, low density polyethylene, linear low density polyethylene, olefins such as a crystalline propylene copolymer composed of propylene and ⁇ -olefin, polyamides, and polyethylene terephthalate.
- examples include various synthetic fibers such as polybutylene terephthalate, low melting point polyester copolymerized with diol and terephthalic acid / isophthalic acid, and polyesters such as polyester elastomer.
- a heat-fusible composite fiber composed of a low-melting resin and a high-melting resin having different melting points and in which the low-melting resin forms at least a part of the fiber surface is preferably used.
- any 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 used.
- emulsion binder either an aqueous emulsion binder or an organic solvent-based emulsion binder can be used, but an aqueous emulsion binder is preferably used from the viewpoints of handleability and safety.
- binder component acrylic resin, vinyl acetate resin, styrene butadiene resin, and the like can be used.
- the airlaid absorber 4 preferably has a basis weight of 150 to 200 g / m 2 , the blending weight of the superabsorbent polymer with respect to the total weight of the airlaid absorber 4 is preferably 30 to 50% by weight, and has a total thickness. It is desirable that it is 2 mm or less.
- the weight ratio of the superabsorbent polymer constituting the superabsorbent polymer A layer 12 to the superabsorbent polymer constituting the superabsorbent polymer B layer 13 is 1 to 1.5, and both are arranged in the same amount.
- it is desirable that the superabsorbent polymer constituting the superabsorbent polymer A layer 12 is disposed in a slightly larger amount within 100 to 150% by weight in order to increase the absorbability of body fluid.
- Examples of the superabsorbent polymer used for the superabsorbent polymer A layer 12 and the superabsorbent polymer B layer 13 include polyacrylate cross-linked products, self-crosslinked polyacrylates, and acrylate-vinyl acetate copolymers.
- Examples include cross-linked saponified products, cross-linked isobutylene / maleic anhydride copolymers, cross-linked polysulfonate salts, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide.
- those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred.
- the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient.
- the superabsorbent polymer constituting the superabsorbent polymer A layer 12 has a physical property value having a relatively higher absorption rate than the superabsorbent polymer constituting the superabsorbent polymer B layer 13.
- the superabsorbent polymer that constitutes the superabsorbent polymer B layer 13 has a physical property value that has a relatively higher absorption capacity than the superabsorbent polymer that constitutes the superabsorbent polymer A layer 12. What has is used.
- the superabsorbent polymer constituting the superabsorbent polymer A layer 12 has an absorption rate of less than 40 (s), preferably 1 to 30 (s), more preferably according to the following ⁇ Water absorption rate test>. Is 25 to 30 (s).
- ⁇ Absorption rate test> (1) Place 50 ml of physiological saline and a stirrer chip in a 100 ml beaker, and place the beaker on a magnetic stirrer. (2) Adjust the rotation speed of the magnetic stirrer to 600 ⁇ 60 times, generate vortex in physiological saline, and quickly add 2.0 g to the beaker. (3) Using a stopwatch, measure the time (s) from the addition of the polymer to the point of time when the vortex on the liquid surface converges to obtain the absorption rate (s).
- the superabsorbent polymer constituting the superabsorbent polymer B layer 13 has a water absorption of 70 (g) or more, preferably 70 to 80 (g), more preferably 70 to 75 (g) is used.
- ⁇ Water absorption test> (1) Place 0.5 g of polymer in a tea bag (200 mesh nylon bag) and 100 ml of physiological saline in a 200 ml beaker. (2) Immerse for 30 minutes, hang for 5 minutes after immersion, drain the water, and measure the mass Wa (g). (3) The same operation is performed on a tea bag without a polymer, and the mass Wb (g) is measured. (4) The amount of water absorption (g) is obtained from Wa (g) -Wb (g) / mass of polymer (g).
- physiological saline used in both tests is a saline containing 0.9 w / v% sodium chloride (“physiological saline solution” in Japanese Pharmacopoeia and prescription drugs).
- the second sheet 6 may be any sheet having hydrophilicity with respect to the body fluid. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc.
- Non-woven fabrics that have been surface treated with a hydrophilizing agent to impart hydrophilicity can be used, and can be obtained by appropriate processing methods such as the spunlace method, spunbond method, thermal bond method, melt blown method, needle punch method, and air through method. Produced nonwoven fabrics can be used.
- the basis weight of the second sheet 6 is preferably 15 to 30 g / m 2 .
- the bodily fluid U discharged to the upper surface of the liquid-permeable surface sheet 3 passes through the micropores 8 and is on the absorber 4 side.
- the concave portion 9 temporarily serves as a tank, the body fluid U easily flows out of the minute hole 8 quickly.
- the body fluid U disappears earlier at the relatively convex portion, the feeling of moistness on the skin is also eliminated earlier.
- the superabsorbent polymer does not deviate outside.
- the superabsorbent polymer A layer 12 has a property value with a relatively high absorption rate
- the superabsorbent polymer B layer 13 has a property value with a relatively high absorption capacity. . Therefore, the bodily fluid U that has flowed from the top sheet 3 can be quickly drawn into the absorber. Further, the body fluid U can hold a large amount of body fluid even if it is a thin airlaid absorber by the superabsorbent polymer B layer 13, so that the amount of absorption can be increased. Since the superabsorbent polymer is divided into the A layer 12 and the B layer 13 and arranged in a layered form, it is not arranged unevenly, and it is difficult to cause a loss of shape.
- the superabsorbent polymer A layer 12 is uniformly formed. However, in order to prevent gel blocking, portions where the superabsorbent polymer is not present may be scattered.
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Abstract
Description
(1)立体開孔メッシュシートの上面に体液を残留させないようにするには、吸収体が十分な体液吸収能を備える必要があるところ、前記エアレイドを吸収体として用いた薄型の吸収性物品の場合は、従来のフラップパルプ吸収体よりも体液の吸収量が少ない。この欠点を補うためには、(1)目付けを上げる、(2)高吸収性ポリマーの混合量を増加するなどの方法が考えられるが、目付けを上げた場合は吸収体が厚くなり、エアレイド吸収体を用いた意義が失われてしまう。また、高吸収性ポリマーの配合量を上げすぎると、膨潤した吸水ポリマー間の空隙が極端に低下する、所謂「ゲルブロッキング」が発生し、所望の吸水力を発現できなくなる、高吸収性ポリマーが偏って配置され易く、型崩れを起こしやすくなるなどの問題が発生してしまう。
(2)立体開孔メッシュシートの上面に体液を残留させないように吸収体に素早く体液を吸収させるために、前記特許文献1では、前記微小開口とは別に、巨視的デボスを形成すること、そしてこれら巨視的デボスの底面を流体通過孔として開口とするが記載されているが、高吸収性ポリマーの配合量を上げたエアレイド吸収体の場合、前記流体通過孔から高吸収性ポリマーが逸脱する場合がある。
前記透液性表面シートは、肌側に突出する多数の微小凸部が形成されるとともに、これら微小凸部の頂面を開孔とした立体開孔メッシュシートを用い、この立体開孔メッシュシートに対して機械的エンボス処理によって、非肌面側に窪む多数の凹部が形成されており、
前記吸収体は、前記透液性表面シート側から順に、エアレイドパルプ不織布層、高吸収性ポリマーA層、エアレイドパルプ不織布層、高吸収性ポリマーB層、エアレイドパルプ不織布層の5層構造のエアレイド吸収体とされ、前記高吸収性ポリマーA層を構成する高吸収性ポリマーは前記高吸収性ポリマーB層を構成する高吸収性ポリマーよりも相対的に吸収速度の高い物性値を有するものが使用されており、前記高吸収性ポリマーB層を構成する高吸収性ポリマーは前記高吸収性ポリマーA層を構成する高吸収性ポリマーよりも相対的に吸収容量が高い物性値を有するものが使用されていることを特徴とする吸収性物品が提供される。
(1)100mlビーカーに生理食塩水50mlとスターラーチップを入れ、ビーカーをマグネチックスターラーに載せる。
(2)マグネチックスターラーの回転数を600±60回に合わせ、生理食塩水に渦を発生させた後に2.0gをビーカーに素早く添加する。
(3)ストップウォッチを用いて、ポリマー添加後から液面の渦が収束する時点までの時間(s)を計測し、吸収速度(s)とする。
<吸水量試験>
(1)ポリマー0.5gをティーバッグ(200メッシュナイロン製袋)を、200mlビーカーに生理食塩水100mlを入れる。
(2)30分間浸漬し、浸漬後5分間吊して水切りし、質量Wa(g)を測定する。
(3)ポリマーを入れていないティーバッグも同様の操作を行い、質量Wb(g)を測定する。
(4)Wa(g)-Wb(g)/ポリマーの質量(g)より、吸水量(g)を求める。
生理用ナプキン1は、主にはパンティライナー、生理用ナプキン、失禁パッドなどの用途に供されるもので、例えば図1に示されるように、ポリエチレンシートなどからなる不透液性裏面シート2と、経血やおりものなどを速やかに透過させる透液性表面シート3と、これら両シート2,3間に介装されたエアレイド吸収体4と、前記吸収体4を囲繞するテッシュなどのクレープ紙5と、前記透液性表面シート3と吸収体4との間に配置されるセカンドシート6とから主に構成されている。前記吸収体4の周囲においては、前記不透液性裏面シート2と透液性表面シート3とがホットメルト接着剤等の接合手段によって接合されている。前記クレープ紙5は省略してもよい。
(1)100mlビーカーに生理食塩水50mlとスターラーチップを入れ、ビーカーをマグネチックスターラーに載せる。
(2)マグネチックスターラーの回転数を600±60回に合わせ、生理食塩水に渦を発生させた後に2.0gをビーカーに素早く添加する。
(3)ストップウォッチを用いて、ポリマー添加後から液面の渦が収束する時点までの時間(s)を計測し、吸収速度(s)とする。
(1)ポリマー0.5gをティーバッグ(200メッシュナイロン製袋)を、200mlビーカーに生理食塩水100mlを入れる。
(2)30分間浸漬し、浸漬後5分間吊して水切りし、質量Wa(g)を測定する。
(3)ポリマーを入れていないティーバッグも同様の操作を行い、質量Wb(g)を測定する。
(4)Wa(g)-Wb(g)/ポリマーの質量(g)より、吸水量(g)を求める。
(1)上記形態例では高吸収性ポリマーA層12を一様に形成したが、ゲルブロッキングを防止するため、高吸収性ポリマーの存在しない部分を点在させるようにしてもよい。
Claims (5)
- 透液性表面シートと裏面シートとの間に吸収体が介在された吸収性物品において、
前記透液性表面シートは、肌側に突出する多数の微小凸部が形成されるとともに、これら微小凸部の頂面を開孔とした立体開孔メッシュシートを用い、この立体開孔メッシュシートに対して機械的エンボス処理によって、非肌面側に窪む多数の凹部が形成されており、
前記吸収体は、前記透液性表面シート側から順に、エアレイドパルプ不織布層、高吸収性ポリマーA層、エアレイドパルプ不織布層、高吸収性ポリマーB層、エアレイドパルプ不織布層の5層構造のエアレイド吸収体とされ、前記高吸収性ポリマーA層を構成する高吸収性ポリマーは前記高吸収性ポリマーB層を構成する高吸収性ポリマーよりも相対的に吸収速度の高い物性値を有するものが使用されており、前記高吸収性ポリマーB層を構成する高吸収性ポリマーは前記高吸収性ポリマーA層を構成する高吸収性ポリマーよりも相対的に吸収容量が高い物性値を有するものが使用されていることを特徴とする吸収性物品。 - 前記高吸収性ポリマーA層を構成する高吸収性ポリマーは、下記<吸水速度試験>による吸収速度が40(s)未満である請求項1記載の吸収性物品。
<吸水速度試験>
(1)100mlビーカーに生理食塩水50mlとスターラーチップを入れ、ビーカーをマグネチックスターラーに載せる。
(2)マグネチックスターラーの回転数を600±60回に合わせ、生理食塩水に渦を発生させた後に2.0gをビーカーに素早く添加する。
(3)ストップウォッチを用いて、ポリマー添加後から液面の渦が収束する時点までの時間(s)を計測し、吸収速度(s)とする。 - 前記高吸収性ポリマーB層を構成する高吸収性ポリマーは、下記<吸水量試験>による吸水量が70(g)以上である請求項1,2いずれかに記載の吸収性物品。
<吸水量試験>
(1)ポリマー0.5gをティーバッグ(200メッシュナイロン製袋)を、200mlビーカーに生理食塩水100mlを入れる。
(2)30分間浸漬し、浸漬後5分間吊して水切りし、質量Wa(g)を測定する。
(3)ポリマーを入れていないティーバッグも同様の操作を行い、質量Wb(g)を測定する。
(4)Wa(g)-Wb(g)/ポリマーの質量(g)より、吸水量(g)を求める。 - 前記透液性表面シートと吸収体との間に、エアスルー不織布を介在させている請求項1~3いずれかに記載の吸収性物品。
- 前記吸収体は、目付けが150~200g/m2であり、吸収体の全重量に対する高吸収性ポリマーの配合重量が30~50重量%であり、前記高吸収性ポリマーA層を構成する高吸収性ポリマー/前記高吸収性ポリマーB層を構成する高吸収性ポリマーの重量比率が1~1.5であり、全体の厚みが2mm以下である請求項1~4いずれかに記載の吸収性物品。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/906,364 US10327965B2 (en) | 2013-07-26 | 2014-07-25 | Absorbent article |
RU2016106375A RU2660303C2 (ru) | 2013-07-26 | 2014-07-25 | Впитывающее изделие |
JP2015528362A JP5945075B2 (ja) | 2013-07-26 | 2014-07-25 | 吸収性物品 |
CN201480042234.0A CN105407846B (zh) | 2013-07-26 | 2014-07-25 | 吸收性物品 |
BR112016001652-1A BR112016001652B1 (pt) | 2013-07-26 | 2014-07-25 | Artigo absorvente |
EP14828864.0A EP3025687B1 (en) | 2013-07-26 | 2014-07-25 | Absorbent article |
KR1020167004350A KR102329570B1 (ko) | 2013-07-26 | 2014-07-25 | 흡수성 물품 |
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JP2013-155558 | 2013-07-26 |
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WO2015012399A1 true WO2015012399A1 (ja) | 2015-01-29 |
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PCT/JP2014/069743 WO2015012399A1 (ja) | 2013-07-26 | 2014-07-25 | 吸収性物品 |
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US (1) | US10327965B2 (ja) |
EP (1) | EP3025687B1 (ja) |
JP (1) | JP5945075B2 (ja) |
KR (1) | KR102329570B1 (ja) |
CN (1) | CN105407846B (ja) |
BR (1) | BR112016001652B1 (ja) |
RU (1) | RU2660303C2 (ja) |
TR (1) | TR201904318T4 (ja) |
WO (1) | WO2015012399A1 (ja) |
Cited By (4)
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JP2017192714A (ja) * | 2016-03-30 | 2017-10-26 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | 超薄型流体吸収性製品 |
WO2017184744A1 (en) | 2016-04-19 | 2017-10-26 | Tredegar Film Products Corporation | Contoured film with micro-protrusions |
CN108778214A (zh) * | 2016-03-24 | 2018-11-09 | 大王制纸株式会社 | 吸收性物品 |
KR101927109B1 (ko) | 2016-03-23 | 2018-12-10 | 유니 참 코포레이션 | 흡수성 물품 |
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EP3207906A1 (en) * | 2014-01-31 | 2017-08-23 | Ontex BVBA | Multi-layer absorbent material |
BR112018009148A8 (pt) * | 2015-12-11 | 2019-02-26 | Tredegar Film Prod Corp | ?película hidroformada com microaberturas tridimensionais? |
US10813797B2 (en) | 2017-06-22 | 2020-10-27 | The Procter & Gamble Company | Laminate webs and absorbent articles having the same |
WO2021112212A1 (ja) * | 2019-12-04 | 2021-06-10 | 東レ株式会社 | 吸収体および衛生材料製品 |
CN113397420B (zh) * | 2021-05-10 | 2022-08-16 | 泉州尧盛纸品有限公司 | 一种婴幼儿用环保型湿巾及湿巾盒 |
CN113786284B (zh) * | 2021-08-31 | 2022-06-10 | 福建恒安集团有限公司 | 一种纸尿裤芯体制作工艺 |
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- 2014-07-25 JP JP2015528362A patent/JP5945075B2/ja active Active
- 2014-07-25 BR BR112016001652-1A patent/BR112016001652B1/pt not_active IP Right Cessation
- 2014-07-25 EP EP14828864.0A patent/EP3025687B1/en active Active
- 2014-07-25 CN CN201480042234.0A patent/CN105407846B/zh not_active Expired - Fee Related
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Cited By (12)
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KR101927109B1 (ko) | 2016-03-23 | 2018-12-10 | 유니 참 코포레이션 | 흡수성 물품 |
CN108778214A (zh) * | 2016-03-24 | 2018-11-09 | 大王制纸株式会社 | 吸收性物品 |
CN108778214B (zh) * | 2016-03-24 | 2021-06-11 | 大王制纸株式会社 | 吸收性物品 |
JP2017192714A (ja) * | 2016-03-30 | 2017-10-26 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | 超薄型流体吸収性製品 |
JP7267670B2 (ja) | 2016-03-30 | 2023-05-02 | ビーエーエスエフ ソシエタス・ヨーロピア | 超薄型流体吸収性製品 |
WO2017184744A1 (en) | 2016-04-19 | 2017-10-26 | Tredegar Film Products Corporation | Contoured film with micro-protrusions |
KR20180136978A (ko) * | 2016-04-19 | 2018-12-26 | 트레데가르 필름 프로덕츠 코포레이션 | 미세 돌출부가 있는 윤곽화된 필름 |
JP2019513496A (ja) * | 2016-04-19 | 2019-05-30 | トレデガー フィルム プロダクツ コーポレーション | 微小突起を有する起伏形成フィルム |
EP3445303A4 (en) * | 2016-04-19 | 2019-11-06 | Tredegar Film Products Corporation | MICRO-PROJECTED PROFILE FILM |
US11167522B2 (en) | 2016-04-19 | 2021-11-09 | Fitesa Film Products Llc | Contoured film with micro-protrusions |
KR102384042B1 (ko) * | 2016-04-19 | 2022-04-07 | 피테사 필름 프로덕츠 엘엘씨 | 미세 돌출부가 있는 윤곽화된 필름 |
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Also Published As
Publication number | Publication date |
---|---|
BR112016001652A2 (pt) | 2017-11-28 |
RU2016106375A (ru) | 2017-08-29 |
KR102329570B1 (ko) | 2021-11-19 |
JP5945075B2 (ja) | 2016-07-05 |
US10327965B2 (en) | 2019-06-25 |
EP3025687A4 (en) | 2017-03-08 |
RU2660303C2 (ru) | 2018-07-05 |
EP3025687A1 (en) | 2016-06-01 |
BR112016001652B1 (pt) | 2021-11-23 |
CN105407846B (zh) | 2019-12-06 |
TR201904318T4 (tr) | 2019-05-21 |
KR20160048778A (ko) | 2016-05-04 |
CN105407846A (zh) | 2016-03-16 |
JPWO2015012399A1 (ja) | 2017-03-02 |
US20160158074A1 (en) | 2016-06-09 |
EP3025687B1 (en) | 2019-02-06 |
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