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WO2022224955A1 - Feuille absorbante et article absorbant - Google Patents

Feuille absorbante et article absorbant Download PDF

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Publication number
WO2022224955A1
WO2022224955A1 PCT/JP2022/018162 JP2022018162W WO2022224955A1 WO 2022224955 A1 WO2022224955 A1 WO 2022224955A1 JP 2022018162 W JP2022018162 W JP 2022018162W WO 2022224955 A1 WO2022224955 A1 WO 2022224955A1
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WO
WIPO (PCT)
Prior art keywords
absorbent
sheet
fiber
fiber sheet
water
Prior art date
Application number
PCT/JP2022/018162
Other languages
English (en)
Japanese (ja)
Inventor
良寛 田中
健司 石黒
陽一 鈴木
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN202290000221.7U priority Critical patent/CN220327595U/zh
Publication of WO2022224955A1 publication Critical patent/WO2022224955A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent 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 outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS 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
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent 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
    • A61F13/534—Absorbent 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

Definitions

  • sheet-like articles containing water-absorbing polymers and absorbent articles comprising the same For the purpose of improving liquid absorbency, antibacterial properties, and deodorant properties, sheet-like articles containing water-absorbing polymers and absorbent articles comprising the same have been developed.
  • Patent Document 2 describes a hydrophobic nonwoven fabric having a water resistance of at least 150 mmH 2 O or more, a hydrophilic sheet having moisture diffusibility, and an average particle size interposed between the hydrophobic nonwoven fabric and the hydrophilic sheet.
  • a water-absorbing and water-resistant sheet having a three-layer structure is disclosed, which is composed of an SAP layer made of SAP particles having a diameter of 500 ⁇ m or less.
  • Patent Document 3 discloses a water-absorbent sheet structure having a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched from above and below the absorbent layer by nonwoven fabrics, wherein the water-absorbent resin is The content is 100 to 1000 g/m 2 , the weight average particle diameter of the water absorbent resin is 50 to 800 ⁇ m, and the particle diameter velocity index of the water absorbent resin is 0.12 sec/ ⁇ m or less, and the peel strength of the water absorbent sheet structure. is 0.05 to 3.0 N/7 cm. The document also describes that this water absorbent sheet structure can be applied to absorbent articles.
  • the present invention relates to absorbent sheets.
  • the absorbent sheet preferably comprises a first fibrous sheet, a second fibrous sheet, and an absorbent layer disposed between these fibrous sheets.
  • the first fiber sheet preferably contains at least one of a deodorant and an antibacterial agent.
  • the absorbent layer preferably contains water-absorbing polymer particles and does not contain water-absorbing fibers. It is preferable that the water retention rate of the second fibrous sheet is higher than that of the first fibrous sheet.
  • the present invention also relates to an absorbent article comprising the absorbent sheet.
  • FIG. 1 is a cross-sectional view schematically showing one embodiment of the absorbent sheet of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing another embodiment of the absorbent sheet of the present invention.
  • 3 is a perspective view schematically showing the absorbent sheet shown in FIG. 2.
  • FIG. 4(a) and 4(b) are cross-sectional views schematically showing one embodiment of the absorbent article of the present invention, respectively.
  • Patent Document 1 Since the absorbent article described in Patent Document 1 includes an antibacterial sheet, it is possible to fully exhibit antibacterial properties, but there is room for improvement in terms of allowing the sheet to exhibit both liquid absorbency and deodorant properties. was there.
  • FIG. 1 shows one embodiment of the absorbent sheet of the present invention.
  • the absorbent sheet 1 shown in FIG. 1 comprises a first fiber sheet 11, a second fiber sheet 12, and an absorbent layer 1A arranged between the fiber sheets 11,12.
  • the absorbent layer 1A contains particles of the water-absorbent polymer 13 and does not contain water-absorbent fibers.
  • a plurality of particles of the water absorbent polymer 13 are arranged in the sheet surface direction.
  • the absorbent sheet 1 shown in FIG. 1 is preferably open at its periphery. There are no other members on the outer surfaces of the first fiber sheet 11 and the second fiber sheet 12 shown in FIG. Arrangement on the outer surface of each fiber sheet 11, 12 is not prevented.
  • the first fiber sheet 11 and the second fiber sheet 12 are configured such that their water retention rates are different from each other. Specifically, the water retention rate of the second fiber sheet 12 is higher than the water retention rate of the first fiber sheet 11 . Since each fiber sheet has such physical properties, it becomes difficult for the first fiber sheet 11 side to retain body fluids, and the body fluids are easily transferred to the absorbent layer 1A and the second fiber sheet 12 side. At the same time, it is possible to reduce the generation of odors derived from bodily fluids. In addition, on the side of the second fiber sheet 12, the body fluid absorbed by the fiber sheet 12 can be retained, and the retained fluid can be gradually absorbed into the absorbent layer 1A.
  • the outer surface of the absorbent sheet 1 on the side of the first fiber sheet 11 is used as a liquid-receiving surface, which is the surface with which the absorbent sheet 1 first comes into contact with liquid.
  • the second fiber sheet 12 retains the body fluid while the water-absorbing polymer 13
  • the gel blocking caused by the swelling caused by the absorption of liquid it is possible to block the passage of air passing through the absorbent sheet 1 in the thickness direction. As a result, it is possible to effectively reduce the release of body fluid-derived odors to the outside while effectively exhibiting liquid absorbency.
  • the first fiber sheet 11 contains at least one deodorant and an antibacterial agent. Therefore, the above-mentioned effects are further exhibited.
  • liquid absorbency of the absorbent sheet as used herein mainly means that the amount of liquid returning to the absorbent article is reduced when the absorbent sheet is incorporated in the absorbent article.
  • the water retention rate C1 of the first fiber sheet 11 is preferably 10% by mass or more, more preferably 100% by mass or more, and still more preferably 200% by mass or more, It is preferably 300% by mass or less, more preferably 290% by mass or less, and even more preferably 280% by mass or less.
  • the water retention rate C2 of the second fiber sheet 12 is such that C1 ⁇ C2.
  • the water retention rates C1 and C2 of the fiber sheets 11 and 12 can be appropriately adjusted, for example, by changing the basis weight and thickness of the fiber sheets, or the material of the fibers forming the fiber sheets.
  • the difference (C2-C1) between the water retention rate C1 of the first fiber sheet 11 and the water retention rate C2 of the second fiber sheet 12 is, on the condition that C1 ⁇ C2, It is preferably 200% by mass or more, more preferably 250% by mass or more, still more preferably 350% by mass or more, preferably 900% by mass or less, more preferably 800% by mass or less, and still more preferably 700% by mass or less.
  • the water retention rate of the fiber sheet can be measured by the following method. Specifically, the fiber sheet to be measured is taken out from the absorbent sheet 1 while being careful not to change the thickness of the fiber sheet. When the fiber sheet to be measured is bonded to another member with an adhesive, the adhesive is solidified by cooling means such as cold spray and then taken out. When the water-absorbing polymer 13 is adhered to the fiber sheet to be measured, the water-absorbing polymer 13 is removed after solidifying the adhesive using a cold spray or the like. The extraction method up to this point is common to other measurement methods in this specification. Then, the fiber sheet to be measured is cut into a size of 100 mm square to obtain a sample, and the mass W1 (g) of this sample is measured. These procedures are performed in an environment of temperature 15 to 35° C. and humidity 20 to 70% RH.
  • the fiber sheets 11 and 12 used in the present invention are typically aggregates of fibers and have a thickness of 5 mm or less measured under a pressure of 1.7 kPa. Both of these fiber sheets 11 and 12 preferably do not contain a water-absorbent polymer, and are preferably composed only of aggregates of fibers. Each of the fiber sheets 11 and 12 is independently shape-retained by entangling, joining, or fusing the constituent fibers, or a combination thereof. The thickness of the fiber sheet can be measured using, for example, a laser displacement meter.
  • the fiber sheets 11 and 12 do not intentionally contain a water-absorbent polymer, but for example, fine particles of polymer derived from the water-absorbent polymer 13 are added to the fiber sheets 11 and 12. Unavoidable contamination means acceptance.
  • the fiber sheets 11 and 12 contain the water-absorbent polymer independently in each of the fiber sheets 11 and 12, preferably 10% by mass or less, more preferably 5% by mass or less, More preferably, it is handled as containing 3% by mass or less.
  • the constituent fibers of each of the fiber sheets 11 and 12 independently include, for example, wood pulp, natural pulp such as cotton and hemp, modified pulp such as mercerized pulp and chemically crosslinked pulp, polyolefin such as polyethylene and polypropylene, Synthetic fibers containing at least one type of resin among polyesters such as polyethylene terephthalate, regenerated fibers such as rayon, cupra and tencel, or fibers obtained by subjecting these fibers to hydrophilic treatment or hydrophobic treatment. fibers.
  • each of the fiber sheets 11 and 12 is paper, woven fabric, or non-woven fabric.
  • Each of the fiber sheets 11 and 12 may independently be a single layer or multiple layers.
  • Each of the fiber sheets 11 and 12 may be composed of only one fiber assembly (regardless of whether it is a single layer or multiple layers), or a first fiber assembly and a fiber assembly different from the first fiber assembly. It may have a multi-ply laminate structure in which sheet materials other than the body or fiber assembly are overlaid. From the viewpoint of improving the liquid absorbency of the absorbent sheet 1, each of the fiber sheets 11 and 12 is preferably a single-layer sheet.
  • the absorbent layer 1A is a layer that mainly absorbs and retains liquid in contact with the absorbent sheet 1.
  • the absorbent layer 1A contains particles of the absorbent polymer 13 and does not contain absorbent fibers. With such a configuration, it is possible to reduce the amount of free water derived from body fluids that remains without being absorbed by the water-absorbing polymer 13, so that the liquid absorbency can be improved.
  • a hydrogel material capable of absorbing and retaining water can generally be used for the water-absorbent polymer 13, and for example, a polymer or copolymer of acrylic acid or an alkali metal salt of acrylic acid can be used. Examples thereof include polyacrylic acid and its salts and polymethacrylic acid and its salts, specifically partial sodium salts of acrylic acid polymers.
  • the shape of the water-absorbing polymer 13 is not particularly limited, and may be, for example, spherical, tufted, massive, bale-shaped, fibrous, amorphous, or a combination of these particles.
  • “Not containing water-absorbent fibers” means that the absorbent layer 1A does not contain water-absorbent fibers intentionally, but water-absorbent fibers such as fibers derived from the fiber sheets 11 and 12 are inevitably mixed into the absorbent layer 1A. To do means to allow.
  • the absorbent layer 1A is treated as containing preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less of water-absorbing fibers.
  • the first fiber sheet 11 preferably contains at least one kind of deodorant and antibacterial agent.
  • deodorant and antibacterial agent By containing such an agent, it is possible to reduce the perception of unpleasant odors originating from body fluids and reduce the generation of odors.
  • the above-mentioned effect resulting from the inclusion works synergistically, and the deodorizing property can be further improved.
  • the outer surface of the first fiber sheet 11 is used as the liquid-receiving surface, body fluid comes into contact with the first fiber sheet 11 earlier, so that the effect of reducing unpleasant odors is efficiently achieved. be done.
  • a deodorant is a substance that can exert a deodorizing effect by directly acting on odors (odorous substances) by adsorbing, neutralizing, or decomposing them.
  • deodorants used in the present invention include water-insoluble deodorants such as porous particles and water-soluble deodorants such as water-soluble compounds. These can be used singly or in combination.
  • a porous particle as a deodorant is a particle having a large number of pores at least on the particle surface, and is capable of capturing, adsorbing and/or containing volatilizing odor components in the pores.
  • Materials for the porous particles include organic compounds, inorganic compounds, polymers thereof, and combinations thereof.
  • porous particles include acrylic polymers such as porous methacrylic acid polymers and porous acrylic acid polymers, aromatic polymers such as porous divinylbenzene polymers and porous pyridine copolymers, and copolymers thereof.
  • Synthetic porous polymers other than the above water-absorbing polymers such as polymers; Natural porous polymers such as chitin and chitosan; Zinc oxide, activated carbon, silica, silicon dioxide (silica gel), calcium silicate, aluminosilicate compounds, high silica Metal-supporting porous materials such as zeolite (hydrophobic zeolite), sepiolite, cancrinite, zeolite, and inorganic porous materials such as hydrated zirconium oxide can be used. These can be used singly or in combination. These porous particles can be carried, for example, on the surface or inside of the fibers that make up the fiber sheet, or held between the constituent fibers.
  • the water-soluble compound as a deodorant is an agent that neutralizes acidic or alkaline odorous components derived from body fluids, or exerts a deodorant effect due to pH buffering.
  • agents include water-soluble organic compounds such as weak acids, conjugate bases thereof, mixtures thereof or salts thereof, weak bases, conjugate acids thereof, or mixtures thereof, and salts thereof.
  • water-soluble compounds as deodorants include weak acids such as citric acid, and salts thereof such as water-soluble metal salts such as Na, K and Ca.
  • weak bases include polyhydroxyamine compounds such as tris(hydroxymethyl)aminomethane.
  • the antibacterial agent is an agent that suppresses or kills the growth and growth of bacteria that contribute to the generation of unpleasant odors caused by bodily fluids such as urine and menstrual blood. and the growth of intestinal bacteria, and the activity of enzymes derived from these bacteria.
  • antibacterial agents include inorganic antibacterial agents and organic antibacterial agents. These can be used singly or in combination.
  • inorganic antibacterial agents include fine particle powders and acicular crystals in which one or more kinds of ions and salts of antibacterial metals such as silver, zinc, copper, iron, magnesium, calcium, aluminum, antimony, and bismuth are supported on a carrier.
  • the carrier include one or more selected from zeolite, silica gel, low-molecular glass, calcium phosphate, zirconium phosphate, silicate, titanium oxide, and the like.
  • the organic antibacterial agent includes one or more selected from cationic antibacterial agents, anionic antibacterial agents and nonionic antibacterial agents. These organic antimicrobial agents are preferably water soluble.
  • Anionic antibacterial agents include piroctone olamine [1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridone monoethanolamine salt], potassium oleate, 1
  • piroctone olamine [1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridone monoethanolamine salt]
  • potassium oleate 1
  • nonionic antibacterial agents include one or more selected from chlorhexidine hydrochloride, chlorhexidine gluconate, triclocarban, triclosan, isopropylmethylphenol, halocarban, paraoxybenzoic acid ester, and the like. All of these are examples of water-soluble nonionic antibacterial agents.
  • Cationic antibacterial agents include those containing quaternary ammonium salts.
  • the quaternary ammonium salt can be used without any particular limitation.
  • Antimicrobial agents can be these quaternary ammonium salts. All of these are examples of water-soluble cationic antibacterial agents.
  • the first fiber sheet 11 contains at least a water-soluble antibacterial agent among at least one of the deodorant and the antibacterial agent described above.
  • the water-soluble antibacterial agent can be easily dissolved in the moisture of the body fluid when the first fiber sheet 11 and the body fluid come into contact with each other.
  • the growth of odor-causing bacteria can be efficiently suppressed, and the deodorizing properties can be further improved.
  • the outer surface of the first fiber sheet 11 is used as the liquid-receiving surface, body fluids come into contact with the first fiber sheet 11 earlier, so that the effect of reducing unpleasant odors is more pronounced. be done.
  • the first fiber sheet 11 contains the water-soluble antibacterial agent, for example, an aqueous solution of the antibacterial agent is carried on the first fiber sheet 11 by a method such as spraying, spraying, immersion, or dropping. good.
  • a method such as spraying, spraying, immersion, or dropping. good.
  • the above-mentioned deodorant and antibacterial agent may be contained in the second fiber sheet 12 in addition to the first fiber sheet 11, but the manufacturing cost is reduced.
  • the first fiber sheet 11 contains only the first fiber sheet 11 from the viewpoint of reducing the amount and improving the odor resistance and deodorant properties.
  • At least one of piroctone olamine and benzalkonium salts is more preferable as the water-soluble antibacterial agent that is suitably used in the present invention.
  • the content of the deodorant in the fiber sheets 11 and 12 is preferably 0.05 g/m 2 independently. Above, more preferably 0.1 g/m 2 or more, still more preferably 0.2 g/m 2 or more. From the same point of view, the content of the antibacterial agent in the fiber sheets 11 and 12 is preferably 0.05 g/m 2 or more, more preferably 0.1 g/m 2 or more, and still more preferably 0.2 g/m 2 or more. 2 or more.
  • the water retention rate of the second fiber sheet 12 is higher than that of the first fiber sheet 11, so that the second fiber sheet 12 can easily retain the liquid and absorb the liquid.
  • Liquid absorbency can be enhanced in combination with the layer.
  • the liquid since the liquid is less likely to be retained in the first fiber sheet 11, the liquid can be easily transferred to the absorbent layer 1A side, and the liquid absorbency can be improved, and the unpleasant odor caused by the residual liquid can be reduced.
  • gel blocking caused by swelling of the water-absorbing polymer accompanying the absorption of liquid, ventilation in the thickness direction of the sheet is likely to be inhibited. Also, it is possible to suppress the emission of unpleasant odors to the outside through the first fiber sheet 11 .
  • the odor of the body fluid itself and the unpleasant odor caused by the body fluid coming into contact with the first fiber sheet 11 can be eliminated. It is possible to suppress the generation and improve the deodorizing and deodorizing properties.
  • each of the advantages described above can be obtained when an absorbent article including the absorbent sheet 1 is formed, specifically, the outer surface of the absorbent sheet 1 on the side of the first fiber sheet 11 is the liquid receiving surface.
  • the absorbent sheet 1 is arranged as a constituent member of an absorbent article, the emission of unpleasant odors to the outside through the first fiber sheet 11 is suppressed, and the deodorizing and deodorizing properties are improved. It is advantageous in that it can be enhanced.
  • the first fiber sheet 11 is preferably paper.
  • Paper refers to a product made by agglutinating vegetable fibers such as pulp and other fibers, preferably by a wet process, in accordance with the provisions of JIS P0001.
  • the second fiber sheet 12 is preferably a nonwoven fabric, more preferably a nonwoven fabric containing hydrophilic fibers.
  • the absorbed liquid is easily retained in the second fiber sheet 12, so that the liquid absorbability and deodorant properties can be more effectively exhibited.
  • the water retention rate of the second fiber sheet 12 can be increased more easily.
  • the hydrophilic fibers that can be used in the second fiber sheet are preferably rayon, cupra, tencel, etc., from the viewpoint of enhancing the entanglement with other fibers during the production of the fiber sheet and from the viewpoint of expressing high liquid retention. regenerated fiber.
  • the second fiber sheet 12 is formed by fusing the constituent fibers from the viewpoint of improving the liquid retention property, further increasing the liquid absorption property of the absorbent sheet 1, and further reducing the release of unpleasant odors derived from the liquid. It is preferably a nonwoven fabric having a predetermined ratio or less of points, or a nonwoven fabric having no fusion points. Specifically, the second fiber sheet 12 is preferably a nonwoven fabric, and preferably has 30 or less fusion points between constituent fibers, more preferably 20 or less points, and still more preferably 10 or less points. Alternatively, the second fibrous sheet 12 is preferably a non-woven fabric having no fusing points.
  • the degree of freedom of movement of the constituent fibers can be increased, and water can be retained between the constituent fibers, so that the water retention rate of the second fiber sheet 12 can be further increased. can be done.
  • the liquid absorption and deodorant properties of the absorbent sheet 1 are further improved.
  • a nonwoven fabric for example, a spunlaced nonwoven fabric or an air-through nonwoven fabric may be used, or a nonwoven fabric containing two or more types of fibers, ie, a fiber containing a high melting point component and a fiber containing a low melting point component, may be used.
  • a heat-sealed nonwoven fabric may be used on the condition that the number of fusion points between the constituent fibers is equal to or less than the number described above.
  • a heat-sealing means an air-through method of blowing hot air or a heat embossing roll can be used.
  • Fibers containing a high melting point component include fibers containing a thermoplastic resin such as polyethylene terephthalate (PET).
  • Fibers containing a low-melting-point component include, for example, fibers containing a thermoplastic resin such as polyethylene (PE). Fibers using these thermoplastic resins may be used as single fibers or as composite fibers.
  • a core-sheath type composite fiber for example, a side-by-side composite fiber, or the like can be used.
  • core-sheath type conjugate fibers are used as constituent fibers of the nonwoven fabric. is preferably used.
  • the number of fusion points between fibers is the number of fusion points present in one fiber, and is defined in units of "points/fiber".
  • the number of fiber fusion points is measured by the following method. First, a measurement piece cut out by the same method as described above is placed on a sample stage of a scanning electron microscope (SEM) on which a carbon tape is placed and fixed. Next, from the SEM image obtained by enlarging the fiber by 150 times, the total number of portions where the intersection points of the fibers are fused together is counted. A fused portion is a portion where the boundary between fibers is unclear. Based on the same SEM image, the length of the displayed fiber is measured from all the displayed fibers. This operation is performed from five SEM images.
  • SEM scanning electron microscope
  • the air-through nonwoven fabric and rayon per se have excellent liquid holding power.
  • a nonwoven fabric containing rayon as a constituent fiber has a sufficiently high liquid holding power, so that a high water retention rate C2 can be maintained even when an external force such as body pressure is applied to the nonwoven fabric.
  • the first fiber sheet 11 is paper and the second fiber sheet 12 is an air-through nonwoven fabric, or rayon is used as a constituent fiber. It is preferable that the first fiber sheet 11 is paper and the second fiber sheet 12 is a spunlaced nonwoven fabric containing rayon as a constituent fiber.
  • the basis weight of the first fiber sheet 11 is preferably 10 g/m 2 or more, more preferably 13 g/m 2 or more, still more preferably 15 g/m 2 or more, preferably 25 g/m 2 or less, more preferably 20 g/m 2 or less, still more preferably 18 g/m 2 It is below.
  • the basis weight of the second fiber sheet 12 is preferably 25 g/m 2 or more, more preferably 30 g/m 2 or more, still more preferably 35 g/m 2 or more, and preferably 60 g/m 2 .
  • more preferably 50 g/m 2 or less still more preferably 45 g/m 2 or less.
  • FIGS. Another embodiment of the absorbent sheet 1 is shown in FIGS.
  • the same reference numerals are given to the same members as in the above-described embodiment.
  • the absorbent sheet 1 shown in FIGS. 2 and 3 comprises a first fiber sheet 11, a second fiber sheet 12, and an absorbent layer 1A arranged between the fiber sheets 11,12.
  • Absorbent layer 1A comprises a plurality of particles of water-absorbing polymer 13 .
  • the first fiber sheet 11 and the second fiber sheet 12 are bonded together with an adhesive 15 .
  • the adhesive 15 shown in FIG. 2 is placed on the surfaces of the fiber sheets 11 and 12 facing the water-absorbing polymer 13 . Both the outer surfaces of the first fiber sheet 11 and the second fiber sheet 12 shown in the figure are free of the adhesive 15 and other members.
  • the first fiber sheet 11 and the second fiber sheet 12 are bonded to each other without the absorbent polymer 13 in the absorbent layer 1A.
  • a portion 17 directly joined by 15 (hereinafter also simply referred to as “directly joined portion 17”), and a portion 18 where both fiber sheets 11 and 12 are joined by an adhesive 15 via a water-absorbent polymer 13. (Hereinafter, this is also referred to as “indirect bonding portion 18”.).
  • the water-absorbent polymer 13 can be held at a predetermined position on the absorbent sheet 1 , and unintended movement or uneven distribution of the water-absorbent polymer 13 can be further reduced. Liquid absorbency can be further enhanced.
  • the indirect joint site 18 includes the site where the adhesive 15 is applied on the first fiber sheet 11, the site where the water-absorbing polymer 13 exists, and the site where the water-absorbent polymer 13 exists. 2 are portions where the adhesive 15 is applied on the fiber sheet 12 and overlapped in the thickness direction.
  • the adhesive 15 it is preferable to use one having flexibility that can be stretched according to the swelling change accompanying the liquid absorption of the water-absorbent polymer 13.
  • raw materials include (co)polymers of vinyl monomers such as 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, cyanoacrylate, vinyl acetate, and methyl methacrylate (ethylene-vinyl acetate copolymers, etc.). ), etc., silicone adhesives containing polydimethylsiloxane polymer, etc., natural rubber adhesives including natural rubber, etc., polyisoprene, chloroprene, etc.
  • Isoprene adhesive styrene-butadiene copolymer (SBR), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer
  • SBR styrene-butadiene copolymer
  • SBS styrene-ethylene-butadiene-styrene block copolymer
  • SEBS styrene-based adhesives containing one or more polymers
  • SEPS styrene-ethylene-propylene-styrene block copolymers
  • the adhesive applied to the first fiber sheet 11 and The adhesive applied to the second fiber sheet 12 may be of the same type or of a different type.
  • the fiber sheets 11 and 12 are excellent in flexibility and stretchability, and the state in which the fiber sheets 11 and 12 are directly joined is maintained even after swelling of the water-absorbent polymer, and the shrinkage force is developed to make both the fiber sheets 11 , 12, it is preferable to use a rubber-based adhesive as the adhesive 15, and it is more preferable to use a styrene-based adhesive among the rubber-based adhesives.
  • the adhesive 15 is preferably a hot-melt adhesive.
  • Hot-melt adhesives include, for example, the various adhesives described above, tackifiers such as petroleum resins and polyterpene resins, plasticizers such as paraffin oils, and, if necessary, phenol-based, amine-based, phosphorus-based, Antioxidants such as benzimidazoles may be included.
  • adhesive 15 is applied to each of the surface of the first fiber sheet 11 facing the water-absorbing polymer 13 and the surface of the second fiber sheet 12 facing the water-absorbing polymer 13. It is preferable that With such a configuration, the adhesive applied to each of the fiber sheets 11 and 12 is bonded together to efficiently form the direct bonding portion 17 on the absorbent sheet 1, and the water absorbent polymer 13 can be supported at an appropriate position and securing a space in which the water-absorbent polymer 13 can swell. In addition, since the adhesive 15 can easily exist in the gaps between the fibers constituting the fiber sheets 11 and 12, peeling at the interfaces between the fiber sheets 11 and 12 and the adhesive 15 can be prevented. It also has the advantage of being less likely to occur.
  • the coating area of the adhesive 15 on the second fiber sheet 12 is larger than the coating area of the adhesive 15 on the first fiber sheet 11 .
  • the water-absorbing polymer 13 is uniformly held on the second fiber sheet 12 having a coating area of the adhesive 15 larger than that of the first fiber sheet 11, and the water-absorbing polymer While suppressing unintended movement and falling off of 13, the adhesive 15 coating area is secured from the side of the first fiber sheet 11 smaller than the second fiber sheet 12, liquid permeability is ensured, and liquid absorbency is improved. can be further enhanced.
  • the first fiber sheet 11 may be coated with a non-coated portion of the adhesive 15, such as spiral coating, summit coating, or omega coating.
  • a method such as spray coating or coater coating, which can continuously apply the adhesive 15 to the sheet surface, can be used.
  • the adhesive 15 is arranged so that the first fiber sheet 11 has a non-coated portion of the adhesive 15 on the surface facing the second fiber sheet 12.
  • the second fiber sheet 12 has an adhesive 15 distributed over the entire area of the opposing surface of the first fiber sheet 11 .
  • the adhesive coating areas of the above-described fiber sheets 11 and 12 are compared by laminating the fiber sheets 11 and 12 having the same shape and area so that no sheet overlaps. .
  • the coating area of the adhesive 15 for example, the area where the adhesive 15 is present is visualized using an ink toner or the like on the surfaces of the fiber sheets 11 and 12 on which the adhesive 15 is adhered. can be calculated using image processing software or the like. If it is difficult to distinguish, the measurement may be performed after peeling off both sheets using a cold spray or the like.
  • the first basis weight of the adhesive 15 applied to the first fiber sheet 11 is the same as that applied to the second fiber sheet 12 . It is preferably higher than the second basis weight of the applied adhesive 15 . With such a configuration, it is easy to form the direct bonding portion 17 with the second fiber sheet 12 via the adhesive 15 applied to the first fiber sheet 11, and the second Since the water-absorbent polymer 13 can be held in an appropriate position through the adhesive 15 applied to the fiber sheet 12, the liquid absorption performance can be further improved.
  • the first basis weight is preferably 400 g/m 2 or less, more preferably 250 g/m 2 or less, still more preferably 100 g/m 2 or less, and 20 g/m 2 or more is realistic.
  • the second basis weight is preferably 30 g/m 2 or less, more preferably 15 g/m 2 or less, still more preferably 10 g/m 2 or less, and more preferably 2 g/m 2 or more.
  • the above-described first basis weight and second basis weight are respectively measured and calculated for only the coated portions of the fiber sheets 11 and 12 where the adhesive 15 is coated. Specifically, after separating the fiber sheets 11 and 12 from the absorbent sheet 1, the mass A1 (g) of the first fiber sheet 11 with the adhesive 15 attached thereto is measured. Ink toner or the like is used to visualize the portion of the adhesive 15 on the side of the first fiber sheet 11 to which the adhesive 15 is attached, and in this state, image processing software is used. , the total area S (m 2 ) of the portion where the adhesive 15 is present is measured. Next, the first fiber sheet 11 is immersed in an organic solvent, and the mass A2 (g) of the fiber sheet after dissolving the adhering adhesive 15 is measured. The first basis weight (g/m 2 ) can be calculated from the formula “(A1 ⁇ A2)/S”. Similarly, the second basis weight (g/m 2 ) can be calculated for the second fiber sheet 12 in the same manner as described above.
  • the absorbent sheet 1 of the embodiment shown in FIGS. 1 and 2 and 3 described above may be used as it is.
  • one absorbent sheet 1 may be used, or a plurality of absorbent sheets may be used in a laminated state.
  • a plurality of absorbent sheets only the absorbent sheet 1 of the embodiment shown in FIG. 1 or only the absorbent sheet 1 of the embodiment shown in FIGS.
  • the absorbent sheet 1 of the above embodiment and the absorbent sheet 1 of the embodiment shown in FIGS. 2 and 3 may be used in combination.
  • the absorbent sheet 1 of the embodiment shown in FIGS. 1, 2 and 3 described above can be used as a constituent member of an absorbent article.
  • absorbent articles include, but are not limited to, disposable diapers, incontinence pads, sanitary napkins, panty liners, and the like. It broadly encompasses articles used to absorb liquids.
  • Absorbent articles typically have a longitudinal direction along the front-rear direction of the wearer and a width direction orthogonal to the longitudinal direction, and include a topsheet and a backsheet. A liquid-retaining absorber is provided between the sheets.
  • the absorbent article of the present invention can be provided with the absorbent sheet 1 described above as an absorbent body. Examples of absorbent articles include incontinence pads, sanitary napkins, and disposable diapers.
  • the absorbent sheet 1 When the absorbent sheet 1 is used as a constituent member of the absorbent article from the viewpoint of improving the liquid absorbency of the absorbent article, the absorbent sheet 1 may be used in one sheet or a plurality of sheets in a folded state. , a plurality of sheets may be used in a laminated state.
  • an absorbent body other than the absorbent sheet may be further laminated for use.
  • the absorbent sheet 1 is laminated with an absorbent body other than the absorbent sheet, the absorbent body is preferably arranged at least in the central region of the absorbent sheet 1 .
  • Other absorbents include, for example, a pile of hydrophilic fibers such as cellulose such as pulp, and a mixed pile of hydrophilic fibers and a water-absorbing polymer.
  • the surface sheet used for the absorbent article is the surface facing the skin of the wearer wearing the absorbent article when the absorbent article is worn in a proper position (hereinafter, this is also referred to as the "skin facing surface”. ) side, and the back sheet constitutes the side facing away from the skin of the wearer wearing the absorbent article (hereinafter also referred to as "non-skin facing side").
  • the topsheet and the backsheet used in absorbent articles those conventionally used in absorbent articles can be used without particular limitation.
  • the surface sheet for example, various liquid-permeable nonwoven fabrics, perforated films, and the like can be used.
  • As the back sheet a liquid-impermeable or water-repellent resin film, a laminate of a resin film and a non-woven fabric, or the like can be used.
  • leak-proof cuffs extending along the longitudinal direction are arranged on both sides along the longitudinal direction of the side facing the skin.
  • a leak-tight cuff generally has a proximal end and a free end.
  • the leak-proof cuff has a base end on the skin-facing side of the absorbent article and stands up from the skin-facing side.
  • the leak-tight cuff is constructed from a liquid-resistant or water-repellent and breathable material.
  • An elastic member made of rubber thread or the like may be arranged in a stretched state at or near the free end of the leak-proof cuff.
  • the contraction of the elastic member causes the leak-proof cuff to stand up toward the wearer's body, and the liquid excreted on the topsheet spreads across the width of the absorbent article.
  • Directionally outward leakage is effectively prevented.
  • the first fiber sheet 11 in the absorbent sheet 1 is arranged so as to include the liquid receiving surface. That is, it is preferable to arrange the absorbent sheet 1 so that the first fiber sheet 11 is arranged on the side facing the skin.
  • FIGS. 4(a) and 4(b) A cross-sectional view of an embodiment in which the absorbent sheet 1 is used as a constituent member of an absorbent article is schematically shown in FIGS. 4(a) and 4(b).
  • the absorbent article 50 includes a topsheet 51 arranged on the skin-facing side, a backsheet 52 arranged on the non-skin-facing side, and a topsheet 51 and a backsheet 52 . and an absorbent sheet 1 arranged between.
  • the absorbent article 50 is preferably arranged such that one absorbent sheet 1 is folded back so that the second fiber sheets 12 face each other.
  • one continuous first fiber sheet 11 constitutes the skin-facing surface and the non-skin-facing surface of the absorbent sheet 1 .
  • the second fiber sheet 12 holding the liquid can be arranged inside the absorbent article, so that the absorbed liquid can be confined inside.
  • the gel blocking caused by the swelling of the water-absorbing polymer 13 obstructs the flow path of the air passing through the absorbent sheet 1 in the thickness direction, thereby confining the odor.
  • the unpleasant odor originating from the liquid retained in the second fiber sheet 12 is effectively prevented from diffusing to the outside, further improving the deodorant property of the absorbent article.
  • the absorbent article 50 preferably has two absorbent sheets 1 arranged in a laminated state such that the second fiber sheets face each other.
  • the first fiber sheet 11 of one absorbent sheet 1 is arranged on the skin facing side
  • the first fiber sheet 11 of the other absorbent sheet 1 is arranged on the non-skin facing side.
  • the absorbent sheet 1 shown in FIG. 1 described above is formed by joining the fiber sheets 11 and 12 by a known joining method such as embossing, for example, in a state in which a water-absorbent polymer is placed between the fiber sheets 11 and 12. can be manufactured by This allows the particles of the water-absorbing polymer 13 to be retained between the two fiber sheets 11,12.
  • the absorbent sheet 1 shown in FIGS. An adhesive 15 is applied to each of the one surface of the .
  • particles of the water-absorbing polymer 13 are sprayed from the polymer spraying section 150 onto the surface of the second fiber sheet 12 coated with the adhesive 15 .
  • the fiber sheets 11 and 12 are overlapped so that the adhesive-coated surfaces of the fiber sheets 11 and 12 face each other to obtain a laminate.
  • This laminate may be subjected to a pressing process as necessary.
  • the absorbent sheet 1 in which the water absorbent polymer 13 is arranged between the fiber sheets 11 and 12 can be manufactured.
  • ⁇ 1> comprising a first fibrous sheet, a second fibrous sheet, and an absorbent layer disposed between the fibrous sheets;
  • the first fiber sheet contains at least one of a deodorant and an antibacterial agent,
  • the absorbent layer contains particles of a water-absorbent polymer and does not contain water-absorbent fibers, An absorbent sheet in which the water retention rate of the second fibrous sheet is higher than the water retention rate of the first fibrous sheet.
  • ⁇ 2> The absorbent sheet according to ⁇ 1> above, wherein the first fiber sheet is paper.
  • the second fiber sheet is a nonwoven fabric having 30 or less fusion points between constituent fibers per fiber, or a nonwoven fabric having no such fusion points.
  • ⁇ 4> The absorbent sheet according to any one of ⁇ 1> to ⁇ 3>, wherein the first fiber sheet contains a water-soluble antibacterial agent.
  • ⁇ 5> The absorbent sheet according to any one of ⁇ 1> to ⁇ 4> above, wherein the first fiber sheet has a water retention rate of 10% by mass or more and 300% by mass or less.
  • the first fibrous sheet and the second fibrous sheet are each independently a sheet whose shape is retained by entangling, joining or fusing the constituent fibers, or a combination thereof, the ⁇ 1> to ⁇ 9> The absorbent sheet according to any one of ⁇ 9>.
  • the water-absorbing polymer is at least one of polyacrylic acid and its salts and polymethacrylic acid and its salts,
  • the porous particles include at least one of synthetic porous polymers, natural porous polymers, and inorganic porous substances excluding the water-absorbing polymer
  • the synthetic porous polymer is one or more selected from porous methacrylic acid polymer, porous acrylic acid polymer, porous divinylbenzene polymer, porous pyridine copolymer, and copolymers thereof
  • the natural porous polymer is one or more selected from chitin and chitosan
  • the inorganic porous material includes zinc oxide, activated carbon, silica, silicon dioxide (silica gel), calcium silicate, aluminosilicate compounds, high silica zeolite (hydrophobic zeolite), sepiolite, cancrinite, zeolite, and hydrated zirconium oxide.
  • the absorbent sheet according to any one of ⁇ 1> to ⁇ 11>, which is one or more selected from:
  • the deodorant contains one or more selected from water-soluble organic compounds and salts thereof, The absorption according to any one of ⁇ 1> to ⁇ 12>, wherein the water-soluble organic compound is one or more selected from weak acids, weak acid conjugate bases, weak bases, weak base conjugate acids, and mixtures thereof.
  • ⁇ 14> Including an inorganic antibacterial agent as the antibacterial agent, Any one of the above ⁇ 1> to ⁇ 13>, wherein the inorganic antibacterial agent is one or more selected from fine particle powder and needle crystals in which one or more of antibacterial metal ions and antibacterial metal salts are supported on a carrier. 1. The absorbent sheet according to 1.
  • ⁇ 15> The absorbent sheet according to ⁇ 14> above, wherein the carrier is one or more selected from zeolite, silica gel, low-molecular-weight glass, calcium phosphate, zirconium phosphate, silicate and titanium oxide.
  • the organic antibacterial agent contains at least one selected from cationic antibacterial agents, anionic antibacterial agents and nonionic antibacterial agents.
  • the second fiber sheet is made of hydrophilic fibers
  • ⁇ 22> The absorbent sheet according to any one of ⁇ 1> to ⁇ 21>, wherein a spunlaced nonwoven fabric is used as the second fiber sheet.
  • ⁇ 23> Any one of ⁇ 1> to ⁇ 22> above, wherein the constituent fibers of the nonwoven fabric constituting the second fiber sheet include two or more types of fibers, ie, a high-melting-point component fiber and a low-melting-point component fiber. absorbent sheet.
  • ⁇ 24> The absorbent sheet according to any one of ⁇ 1> to ⁇ 23>, wherein the first fiber sheet and the second fiber sheet are bonded to each other with an adhesive.
  • the first fibrous sheet and the second fibrous sheet are divided into a portion in which both sheets are directly joined by the adhesive without passing through the water-absorbing polymer in the absorbent layer, and the above-mentioned
  • the absorbent sheet according to ⁇ 24> above which has a portion joined with an adhesive.
  • the portions of the first fiber sheet and the second fiber sheet that are directly bonded by the adhesive have regular or irregular scattered dots when the absorbent sheet is viewed in the plane direction of the sheet.
  • the absorbent sheet according to ⁇ 25> wherein a plurality of absorbent sheets are formed in a shape.
  • the portion where the first fiber sheet and the second fiber sheet are joined by the adhesive through the water-absorbent polymer is the adhesive in the first fiber sheet when the absorbent sheet is viewed in cross section.
  • the basis weight of the adhesive applied to the first fiber sheet is 20 g/m 2 or more and 400 g/m 2 or less
  • the fact that the second fiber sheet does not contain the water-absorbent polymer means that the water-absorbent polymer is contained in the second fiber sheet in an amount of 10% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less.
  • ⁇ 34> The method for producing an absorbent sheet according to any one of ⁇ 1> to ⁇ 33>, applying an adhesive to at least one of the first fiber sheet and the second fiber sheet; Sprinkling a water-absorbent polymer on the surface of the fiber sheet coated with the adhesive, A method for producing an absorbent sheet, wherein the two fiber sheets are superimposed such that the adhesive-coated surfaces of the two fiber sheets face each other.
  • ⁇ 35> applying the adhesive to each of one surface of the first fiber sheet and one surface of the second fiber sheet; The method for producing an absorbent sheet according to ⁇ 34> above, wherein particles of a water-absorbing polymer are dispersed on the adhesive-coated surface of the second fiber sheet.
  • ⁇ 36> An absorbent article comprising the absorbent sheet according to any one of ⁇ 1> to ⁇ 33>.
  • ⁇ 37> The absorbent article according to ⁇ 36> above, wherein the first fiber sheet in the absorbent sheet is arranged on the side facing the skin.
  • One absorbent sheet is arranged in a folded state so that the second fiber sheets face each other, or two absorbent sheets are arranged so that the second fiber sheets face each other.
  • Example 1 An absorbent sheet having the same basic structure as the absorbent sheet 1 shown in FIG. 1 was produced. Specifically, paper was used as the first fiber sheet. As the second fiber sheet, 80% of rayon fiber and core-sheath fiber having a core made of polypropylene (PP) and a sheath (fiber surface) made of PE (hereinafter also referred to as "PP/PE fiber") : A spunlaced nonwoven fabric was used which was blended at a mass ratio of 20%, entangled by a spunlace method, and fused by heat treatment by blowing hot air. A deodorant composed of an organic compound and an organic antibacterial agent were carried on the first fiber sheet by external addition treatment using a spray so that the content shown in Table 1 was obtained.
  • PP polypropylene
  • PE sheath fiber surface
  • a spunlaced nonwoven fabric was used which was blended at a mass ratio of 20%, entangled by a spunlace method, and fused by heat treatment by blowing hot air.
  • Example 1 was obtained by bonding both fiber sheets with a hot-melt adhesive.
  • the basis weight of the paper was 16 g/m 2 and the thickness was 0.1 mm.
  • the spunlace nonwoven fabric had a basis weight of 38 g/m 2 and a thickness of 0.4 mm. There were 15 fusion points between constituent fibers in the spunlace nonwoven fabric.
  • the water retention rate of the paper and the spunlace nonwoven fabric was measured according to the method described above, and the results obtained are shown in Table 1.
  • Example 1 The absorbent sheet obtained in Example 1 was placed horizontally so that the first fiber sheet faced vertically upward. From the side of the first fiber sheet, 20 g of artificial urine was injected into the central area of the fiber sheet using a funnel. As artificial urine, 1.940% by weight of urea, 0.795% by weight of sodium chloride, 0.111% by weight of magnesium sulfate, 0.062% by weight of calcium chloride, 0.198% by weight of potassium sulfate, water (96.887%) and polyoxyethylene lauryl ether (0.007% by mass) were mixed to adjust the surface tension to 53 ⁇ 1 dyne/cm (23° C.). The injection rate was 2 g/s.
  • a filter paper manufactured by Advantec Toyo Co., Ltd., No. 2, diameter 70 mm
  • a 1 kg weight is placed thereon. and pressurized for 5 seconds.
  • the weight, the acrylic plate and the filter paper were removed, and the mass of the filter paper was measured.
  • the mass of the filter paper before and after the test was calculated, and the value was defined as the liquid return amount.
  • the amount of liquid return is closely related to the absorption performance of the absorbent sheet, especially the dry feeling of the skin-facing surface (first fiber sheet), and the smaller the amount of liquid return, the higher the absorption performance of the absorbent sheet. means that
  • Example 3 The air-through nonwoven fabric obtained in Example 2 was further subjected to heat embossing.
  • An absorbent sheet was produced in the same manner as in Example 2, except that the obtained air-through nonwoven fabric was used as the first fiber sheet.
  • the air-through nonwoven fabric had a basis weight of 18 g/m 2 and a thickness of 0.15 mm.
  • the water retention rate of the air-through nonwoven fabric was measured according to the method described above.
  • the liquid return amount, deodorant property and deodorant property of the obtained absorbent sheet were evaluated. Table 1 shows the results obtained.
  • Example 4 Paper was used as the first fiber sheet. Also, a fiber web composed of 100% PET/PE fibers was subjected to an air-through treatment to form a non-woven fabric, thereby obtaining an air-through non-woven fabric. The obtained air-through nonwoven fabric was used as the second fiber sheet. An absorbent sheet was produced in the same manner as in Example 1 except for these. The basis weight of the paper was 14 g/m 2 and the thickness was 0.1 mm. The air-through nonwoven fabric had a basis weight of 25 g/m 2 and a thickness of 0.3 mm. In addition, the water retention rates of the paper and air-through nonwoven fabric were measured according to the method described above. Furthermore, according to the evaluation method similar to that of Example 1, the liquid return amount, deodorant property and deodorant property of the obtained absorbent sheet were evaluated. Table 1 shows the results obtained.
  • Example 1 A spunbond nonwoven fabric made of 100% PP fibers and a meltblown nonwoven fabric made of 100% PP fibers were laminated to obtain a spunbond-meltblown-meltblown-spunbond nonwoven fabric (hereinafter also referred to as "SMMS nonwoven fabric").
  • An absorbent sheet was produced in the same manner as in Example 1, except that the obtained SMMS nonwoven fabric was used as the second fiber sheet.
  • the SMMS nonwoven fabric had a basis weight of 15 g/m 2 and a thickness of 0.12 mm.
  • the water retention rate of the SMMS nonwoven fabric was measured according to the method described above.
  • the liquid return amount, deodorant property and deodorant property of the obtained absorbent sheet were evaluated. Table 1 shows the results obtained.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

La feuille absorbante (1) selon la présente invention est pourvue d'une première feuille de fibres (11), d'une seconde feuille de fibres (12), et d'une couche absorbante (1A) disposée entre ces feuilles de fibres (11), (12). La couche absorbante (1A) contient des particules d'un polymère absorbant l'eau (13) et ne contient pas de fibre absorbant l'eau. La première feuille de fibres (11) contient un déodorant et/ou un agent antibactérien. Le taux de rétention d'eau de la seconde feuille de fibres (12) est supérieur au taux de rétention d'eau de la première feuille de fibres (11). La présente invention concerne également un article absorbant qui est pourvu de la feuille absorbante (1).
PCT/JP2022/018162 2021-04-19 2022-04-19 Feuille absorbante et article absorbant WO2022224955A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313530A (ja) * 1996-05-29 1997-12-09 Shiseido Co Ltd 体液吸収性物品の吸収体
JP2003290281A (ja) * 2002-04-02 2003-10-14 Kao Corp 吸収性物品
JP2010194254A (ja) * 2009-02-27 2010-09-09 Kao Corp 吸収性物品
WO2019130591A1 (fr) * 2017-12-29 2019-07-04 花王株式会社 Absorbeur et article absorbant
JP2019118587A (ja) * 2017-12-29 2019-07-22 花王株式会社 吸収体及び吸収性物品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09313530A (ja) * 1996-05-29 1997-12-09 Shiseido Co Ltd 体液吸収性物品の吸収体
JP2003290281A (ja) * 2002-04-02 2003-10-14 Kao Corp 吸収性物品
JP2010194254A (ja) * 2009-02-27 2010-09-09 Kao Corp 吸収性物品
WO2019130591A1 (fr) * 2017-12-29 2019-07-04 花王株式会社 Absorbeur et article absorbant
JP2019118587A (ja) * 2017-12-29 2019-07-22 花王株式会社 吸収体及び吸収性物品

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