WO2024057895A1 - Absorbent and sanitary material product - Google Patents

Absorbent and sanitary material product Download PDF

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Publication number
WO2024057895A1
WO2024057895A1 PCT/JP2023/030953 JP2023030953W WO2024057895A1 WO 2024057895 A1 WO2024057895 A1 WO 2024057895A1 JP 2023030953 W JP2023030953 W JP 2023030953W WO 2024057895 A1 WO2024057895 A1 WO 2024057895A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
water
absorbing polymer
layer
absorbent body
Prior art date
Application number
PCT/JP2023/030953
Other languages
French (fr)
Japanese (ja)
Inventor
賢一 境
裕隆 花之内
Original Assignee
東レ株式会社
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Publication date
Application filed by 東レ株式会社 filed Critical 東レ株式会社
Publication of WO2024057895A1 publication Critical patent/WO2024057895A1/en

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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
    • 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

  • the present invention relates to absorbent bodies and sanitary material products.
  • Sanitary material products such as disposable diapers and napkins are made of sheet-like absorbents that absorb and retain water-based liquids such as urine and menstrual blood (hereinafter sometimes referred to as urine), and are made of sheet-like absorbents placed on one side of the absorber. It has a top sheet and a back sheet placed on the other side of the absorbent body.
  • the above-mentioned top sheet has permeability to urine and the like, and the above-mentioned back sheet has leak-proof property to urine and the like.
  • the above-mentioned absorbent body has a structure in which a mixture of pulp fibers and a water-absorbing polymer is wrapped in a nonwoven fabric, tissue, or the like.
  • the absorbent body, the top sheet, and the back sheet are arranged in the order of the top sheet, the absorbent body, and the back sheet from the side closest to the wearer when the sanitary material product is worn.
  • an absorbent fabric composed of a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order. body is known (for example, see Patent Document 1).
  • the absorbent body described in Patent Document 1 does not use bulky pulp fibers in the absorbent body, and includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a This is an absorbent body constructed of three nonwoven fabrics in this order. Further, in this absorbent body, an air-through nonwoven fabric is used as the second nonwoven fabric.
  • the air-through nonwoven fabric has wide pores and the water-absorbing polymer easily enters into the air-through non-woven fabric, and when the water-absorbing polymer that enters absorbs water such as urine and swells, it impedes the liquid diffusivity in the air-through nonwoven fabric, resulting in the overall absorption properties of the absorbent body. There is an issue of insufficient capacity.
  • an object of the present invention to provide an absorbent body and sanitary material product that is thin and has excellent absorption characteristics due to the high utilization efficiency of the absorbent polymer arranged between the nonwoven fabrics. .
  • the present invention provides an absorbent body and sanitary material products as follows. That is, (1) An absorbent body comprising a first non-woven fabric, a first water-absorbing polymer group, a second non-woven fabric, a second water-absorbing polymer group and a third non-woven fabric in this order and having a thickness of 4.0 mm or less.
  • the first nonwoven fabric and the first water-absorbing polymer group form a first layer
  • the third nonwoven fabric and the second water-absorbing polymer group form a second layer
  • the first water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric
  • the second water-absorbing polymer group is directly or indirectly fixed to the third nonwoven fabric
  • the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric
  • the liquid diffusion area of the first layer is 40 to 90 cm 2
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
  • the absorbent body according to (1) wherein the hydrophilic fiber is a rayon fiber, (3) the second nonwoven fabric has a basis weight of 20 to 50 g/m 2 ; It is preferable that it is an absorber according to (1) or (2), (4) the first nonwoven fabric includes short fibers A having a single fiber strength of 0.15N or more, The content of the short fibers A is 5 to 40% by mass based on the entire first nonwoven fabric, It is preferable that the absorber is one of (1) to (3), (5) Preferably, the absorbent body according to any one of (1) to (4), wherein the first water-absorbing polymer group has a basis weight of 50 to 400 g/m 2 .
  • the absorber according to any one of (1) to (5) has a saturated absorption amount of the water-absorbing polymer included in the second water-absorbing polymer group of 25 to 70 g/g.
  • the sanitary material product includes the absorbent body according to any one of (1) to (6).
  • the absorbent body of the present invention includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order, and has a thickness of 4.0 mm or less. It is an absorbent material. Further, the first nonwoven fabric and the first water-absorbing polymer group form a first layer, and the third non-woven fabric and the second water-absorbing polymer group form a second layer. The first water-absorbing polymer group is directly or indirectly fixed to a first non-woven fabric, and the second water-absorbing polymer group is directly or indirectly fixed to a third non-woven fabric. There is.
  • the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric.
  • the liquid diffusion area of the first layer is 40 to 90 cm 2 , and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2. .0, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
  • the absorbent body of the present invention having all of these features is thin and has excellent absorption properties.
  • the absorbent of the present invention comprises a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order, the first nonwoven fabric and the first water-absorbing polymer group form a first layer, the third nonwoven fabric and the second water-absorbing polymer group form a second layer, the first water-absorbing polymer group is fixed directly or indirectly to the first nonwoven fabric, and the second water-absorbing polymer group is fixed directly or indirectly to the third nonwoven fabric, and further has the following characteristics: the liquid diffusion area of the first layer is 40 to 90 cm2 , the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
  • liquid such as urine can enter the absorbent body from the first layer side of the absorbent body, The first layer, the second nonwoven fabric, and the second layer proceed inside the absorbent body in this order.
  • the absorbent body having such a structure by making the liquid diffusion area of the second nonwoven fabric larger than the liquid diffusion area of the first layer and the liquid diffusion area of the second layer, the absorbent body of the present invention can be improved.
  • the absorption properties will be excellent.
  • the larger the value of the liquid diffusion area of a layer or nonwoven fabric the better the liquid diffusion property of that layer or nonwoven fabric.
  • the amount of liquid absorbed per passage time means the amount of liquid that a layer or nonwoven fabric can absorb while a liquid such as urine passes through the layer or nonwoven fabric.
  • the liquid that has reached the first layer of the absorbent body is diffused to some extent in the surface direction inside the first layer, and at the same time is absorbed to some extent by the first layer. Then, the liquid that is not absorbed in the first layer reaches the second nonwoven fabric and is widely diffused in the surface direction inside the second nonwoven fabric. Most of the liquid that has not been absorbed by the second nonwoven fabric will transfer to the second layer, and the remaining liquid will transfer to the first layer.
  • this transfer does not occur in the first layer or the second layer. It is carried out in a wide area of 2 layers.
  • the liquid diffusivity of the first layer or the second layer is inferior to that of the second nonwoven fabric, the liquid that migrates will be transferred to the surface of the first layer or the second layer.
  • the water will almost evenly reach the entire group of water-absorbing polymers that are spread out in this direction. Therefore, the water-absorbing polymer contained in the first layer and the second layer can be efficiently utilized.
  • the liquid diffusivity of the first layer and the second layer can be lower than that of the second nonwoven fabric. The amount of liquid absorbed per hour can be increased.
  • the absorbent body of the present invention can absorb a large amount of liquid, that is, has excellent absorption properties.
  • the water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric or the second nonwoven fabric.
  • the amount of absorbing polymer present inside will be extremely small. As a result, high liquid diffusivity of the second nonwoven fabric is ensured.
  • the fact that the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric also contributes to the high liquid diffusivity of the second nonwoven fabric. are doing.
  • the absorbent of the present invention has high absorption properties and does not need to contain bulky pulp fibers to ensure high absorption properties, and as a result, it can be made into a thin absorbent with a thickness of 4.0 mm or less.
  • the fibers constituting the first to third nonwoven fabrics include olefin fibers such as polyethylene fibers and polypropylene fibers, polyester fibers such as polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, and polybutylene terephthalate fibers, nylon fibers, and acrylonitrile fibers.
  • examples include acrylic fibers such as fibers, and cellulose fibers such as cotton, hemp, and rayon fibers.
  • hydrophilic fibers are preferable, and rayon fibers are more preferable because they have excellent liquid diffusion properties such as urine and can be easily made fine.
  • each of the first to third nonwoven fabrics contains rayon fibers in an amount of 50% by mass or more based on the total weight of each nonwoven fabric, from the viewpoint of diffusibility of liquids such as urine.
  • the basis weight of each of the first to third nonwoven fabrics is preferably 20 to 50 g/m 2 .
  • the water-absorbing polymer can be reliably supported by reducing the unevenness in the basis weight of the non-woven fabric, and by increasing the number of fibers, the dispersibility of liquids such as urine into the non-woven fabric can be improved.
  • the basis weight of the nonwoven fabric No. 3 is more preferably 30 g/m 2 or more.
  • the basis weight of the first to third nonwoven fabrics is 45 g/m 2 or less, since it is possible to suppress a decrease in water permeability of urine or the like into the nonwoven fabric.
  • first to third nonwoven fabrics include thermal bond nonwoven fabrics, spunbond nonwoven fabrics, and spunlace nonwoven fabrics.
  • the first to third types of nonwoven fabrics are spunlace because they can be made into nonwoven fabrics without a binder, reduce the risk of contamination with foreign substances such as needles, and are more suitable for sanitary materials.
  • it is a nonwoven fabric.
  • first to third nonwoven fabrics included in the absorbent body of the present invention may be the same or different.
  • the first nonwoven fabric is placed on the top sheet side of the sanitary material, quickly absorbs urine, etc., diffuses the urine etc. absorbed by the first nonwoven fabric, and reduces the amount of water absorbed by the first water absorbing polymer group.
  • the first nonwoven fabric contains short fibers A having a single fiber strength of 0.15N or more, and the short fibers A are added to the whole of the first nonwoven fabric.
  • the content of rayon fibers is preferably 5 to 40% by mass, and the content of rayon fibers is preferably 60 to 95% by mass based on the entire first nonwoven fabric.
  • the fiber length of the short fibers A is preferably 20 to 80 mm, the material of the short fibers A is preferably polyester short fibers or polyamide short fibers, and the short fibers A are preferably hollow fibers.
  • the first nonwoven fabric preferably contains short fibers A having a single fiber strength of 0.15 N or more, and preferably contains 5 to 40% by mass of short fibers A based on the entire first nonwoven fabric.
  • Short fibers are fibers with a fiber length in the range of 10 to 100 mm. From the viewpoint of passability through a card machine, which will be described later, it is more preferable that the fiber length of short fiber A is 20 to 80 mm.
  • the single fiber strength of short fibers refers to the maximum load on the elongation-load curve obtained when a single short fiber is subjected to a tensile test. More specifically, it refers to what is measured by the method described in the measurement method section of Examples.
  • the stiffness of the short fibers will cause the fiber axis of the entire first nonwoven fabric to thicken. This is because the nonwoven fabric becomes bulkier and the voids in the nonwoven fabric become larger, and as a result, the rate of absorption of urine, etc. into the first nonwoven fabric can be increased. It is more preferable that the nonwoven fabric contains short fibers A in an amount of 10% by mass or more based on the entire first nonwoven fabric.
  • the first nonwoven fabric is made of short fibers because it can suppress a decrease in the diffusion of liquids such as urine into the first nonwoven fabric and a decrease in flexibility that affects the feeling of wearing sanitary material products. It is more preferable that A is contained in an amount of 35% by mass or less based on the entire first nonwoven fabric.
  • Examples of the material of the short fiber A include polyolefin short fibers such as polyethylene and polypropylene, polyester short fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, polyamide short fibers, and acrylic fibers such as acrylonitrile. Can be done. Among these short fibers, polyester short fibers and polyamide short fibers are preferred because they have excellent strength, ease of handling, and productivity. Furthermore, polyethylene terephthalate staple fibers and nylon 6 and nylon 66 staple fibers are more preferred.
  • the short fibers A are hollow fibers.
  • the bulk of the short fibers A itself increases, making it easier to orient the fiber axis of the entire first nonwoven fabric in the thickness direction, and as a result, the absorption rate of the first nonwoven fabric can be increased. It is possible to improve the absorption characteristics of the absorber.
  • the first nonwoven fabric preferably contains 60 to 95% by mass of rayon fibers based on the entire first nonwoven fabric. It is more preferable that the first nonwoven fabric contains rayon fibers in an amount of 65% by mass or more based on the entire first nonwoven fabric, since the nonwoven fabric has good diffusibility of liquids such as urine. On the other hand, for the reason that water permeability can be improved by combining with short fibers A having a density of 0.15N or more, the first nonwoven fabric contains 90% rayon fiber by mass relative to the entire first nonwoven fabric. % or less is more preferable.
  • the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric.
  • the second nonwoven fabric is disposed between the first nonwoven fabric and the third nonwoven fabric, and by making the second nonwoven fabric more compatible with liquid diffusion properties such as urine and water permeability, the second nonwoven fabric
  • the second nonwoven fabric By increasing the amount of water absorbed by the water-absorbing polymer on the side and improving the utilization efficiency of the water-absorbing polymer on the first non-woven fabric side, the water-absorbing polymer on the third non-woven fabric side is It can be used efficiently and the absorber has excellent absorption properties.
  • the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric, and the hydrophilic fibers are rayon fibers.
  • the second nonwoven fabric preferably has a basis weight of 20 to 50 g/m 2 .
  • the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric. It is preferable that the second nonwoven fabric contains hydrophilic fibers in an amount of 80% by mass or more based on the entire second nonwoven fabric, since the nonwoven fabric can improve the dispersibility of liquids such as urine and water retention. More preferably, it is 95% by mass or more.
  • hydrophilic fibers include cellulose fibers such as cotton, linen, and rayon fibers. Among these, it is preferable that the hydrophilic fibers contained in the second nonwoven fabric are rayon fibers because they are easy to make finely sized to have excellent dispersibility in liquids such as urine, and are easy to handle. .
  • the second nonwoven fabric preferably has a three-dimensional arithmetic mean roughness of at least one surface of 50 to 300 ⁇ m.
  • Three-dimensional arithmetic mean roughness is an extension of the surface roughness parameter from two-dimensional to three-dimensional. More specifically, it refers to what is measured by the method described in the measurement method section of Examples.
  • the three-dimensional arithmetic mean roughness of at least one surface of the second nonwoven fabric is more preferably 80 ⁇ m or more because uneven placement of the water-absorbing polymer on the nonwoven fabric can be suppressed.
  • the three-dimensional arithmetic mean roughness of at least one surface of the second nonwoven fabric was set to 200 ⁇ m because smoothing the surface can improve the dispersibility of liquids such as urine in the surface direction. It is more preferable that it is below.
  • the means for making the three-dimensional arithmetic mean roughness of at least one surface of the second nonwoven fabric within the above range include the type of fibers constituting the nonwoven fabric, the basis weight of the nonwoven fabric, the type of nonwoven fabric, and the entanglement conditions in making the nonwoven fabric. , adjusting the web manufacturing method, the type of adhesive, and the amount of adhesive used.
  • the third nonwoven fabric used in the absorbent body of the present invention will be explained in detail.
  • the third nonwoven fabric further diffuses urine and the like that have passed through the second nonwoven fabric, thereby improving the amount of water absorbed by the second water absorbing polymer group.
  • the third nonwoven fabric preferably contains rayon fibers in an amount of 80% by mass or more, more preferably 95% by mass or more based on the entire third nonwoven fabric. . When the content of hydrophilic rayon fibers increases, the diffusion of liquids such as urine into the nonwoven fabric becomes better.
  • the short fibers used to obtain the first to third nonwoven fabrics of the present invention are put into a card machine, mixed and opened, and then shaped into a uniform web using a waver.
  • the first to third nonwoven fabrics of the present invention are spunlace nonwoven fabrics
  • the webs are then fed into a water jet type nonwoven fabric forming apparatus and entangled with high-pressure water jets to form nonwoven fabrics. Thereafter, the nonwoven fabric is dried in a hot air oven to obtain a spunlace nonwoven fabric.
  • the constituent fibers are oriented in the longitudinal direction, because in a rectangular absorbent body, the utilization efficiency of the water-absorbing polymer is improved by improving the dispersibility of liquids such as urine in the longitudinal direction.
  • a parallel web or a criss-cross web including a parallel web in which constituent fibers are oriented in the longitudinal direction is preferred.
  • Nonwoven fabrics obtained from these webs have a high degree of fiber orientation in the longitudinal direction of the constituent fibers.
  • the criss-cross web is formed by laminating a parallel web and a cross web in which the parallel web is oriented in the short side direction using a cross layer or the like.
  • the absorbent body of the present invention includes a first water-absorbing polymer group and a second water-absorbing polymer group (hereinafter sometimes simply referred to as a "water-absorbing polymer group").
  • the water-absorbing polymer group is composed of water-absorbing polymers.
  • water-absorbing polymers used in the present invention include starch, crosslinked carboxymethylated cellulose, polymers of acrylic acid or alkali metal salts of acrylic acid, or copolymers thereof, polyacrylates such as sodium polyacrylate, and polyacrylic acid.
  • polyacrylates such as sodium polyacrylate, and polyacrylic acid.
  • acid salt graft polymers include acid salt graft polymers. Among these, sodium polyacrylate is preferred from the viewpoint of productivity.
  • the water-absorbing polymer is preferably in the form of particles from the viewpoint of ease of handling during the manufacturing process.
  • the particle size is preferably 50 to 800 ⁇ m.
  • the particle size of the water-absorbing polymer is the diameter obtained by circular approximation. More specifically, it refers to what is measured by the method described in the measurement method section of Examples.
  • the particle size of the water-absorbing polymer by setting the particle size of the water-absorbing polymer to 50 ⁇ m or more, the water-absorbing polymer penetrates into the inside of each of the first to third nonwoven fabrics, and when the infiltrated water-absorbing polymer absorbs urine, etc. and swells, the nonwoven fabric absorbs urine, etc.
  • water-absorbing polymers having such particle sizes include NS300 (particle size: 212-500 ⁇ m) manufactured by SDP Global and SA60S (particle size: 212-500 ⁇ m) manufactured by Sumitomo Seika.
  • the basis weight of the first and second water-absorbing polymer groups is preferably 50 to 400 g/m 2 .
  • the basis weight of the first and second water-absorbing polymer groups is more preferably 100 g/m 2 or more, since the amount of urine etc. absorbed by the absorber can be improved.
  • the first and third methods are effective because they reduce breathability and prevent the water-absorbing polymer that has absorbed urine etc. from leaking out of the absorbent body due to its weight.
  • the basis weight of the second water-absorbing polymer group is more preferably 300 g/m 2 or less.
  • the ratio of the basis weight of the first water-absorbing polymer group and the second water-absorbing polymer group is preferably from 20:80 to 45:55.
  • the ratio of the basis weight of the first water-absorbing polymer group and the second water-absorbing polymer group is within the above range, the urine etc. absorbed by the second water-absorbing polymer group is absorbed by the second water-absorbing polymer group.
  • the ratio of the basis weight of the first water-absorbing polymer group and the second water-absorbing polymer group is from 30:70 to 40:60.
  • the gel passing rate of the water-absorbing polymer included in the first water-absorbing polymer group is preferably 50 to 350 ml/min.
  • the gel passing rate is the rate at which physiological saline passes between water-absorbing polymers swollen and gelled by physiological saline under load. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. It is possible to improve the dispersibility of liquids such as urine in the first water-absorbing polymer group, and the amount of liquids such as urine sent to the second nonwoven fabric side can be improved. Also, it can be used in sanitary material products such as diapers.
  • the gel passing rate of the water-absorbing polymer included in the first water-absorbing polymer group is 100 ml/min or more because the absorption position can be improved when the water-absorbing polymer is used.
  • the reason is that it is possible to suppress the leakage of liquid such as urine from the first layer containing the first water-absorbing polymer group while the first water-absorbing polymer is insufficiently absorbed.
  • the gel passing rate of the water-absorbing polymer included in the water-absorbing polymer group 1 is more preferably 250 ml/min or less.
  • the saturated absorption amount of the water-absorbing polymer included in the second water-absorbing polymer group is preferably 25 to 70 g/g.
  • the saturated absorption amount is measured by the tea bag method specified in JIS K7223 (1996). More specifically, it refers to what is measured by the method described in the measurement method section of Examples.
  • the saturated absorption amount of the water-absorbing polymer included in the second water-absorbing polymer group is more preferably 30 g/g or more, and more preferably 35 g/g or more. It is even more preferable.
  • the saturated absorption amount of the water-absorbing polymers included in the second water-absorbing polymer group is as follows: More preferably, it is 60 g/g or less.
  • the water-absorbing polymer included in the second water-absorbing polymer group includes spherical particles or aggregates of spherical particles, and the spherical particles or aggregates of spherical particles are added to the entire water-absorbing polymer included in the second water-absorbing polymer group.
  • the content is preferably 60% by mass or more. It is possible to suppress liquids such as urine from being sent to the third non-woven fabric, and leakage of liquids such as urine from the third non-woven fabric occurs before the first water-absorbing polymer and the second water-absorbing polymer are insufficiently absorbed. For the reason that it is possible to suppress % or more is more preferable.
  • the absorbent body of the present invention includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order, and has a thickness of 4.0 mm or less. It is. Further, the first nonwoven fabric and the first water-absorbing polymer group form a first layer, and the third non-woven fabric and the second water-absorbing polymer group form a second layer. Further, the first water-absorbing polymer group is directly or indirectly fixed to the first non-woven fabric, and the second water-absorbing polymer group is directly or indirectly fixed to the third non-woven fabric.
  • the liquid diffusion area of the first layer is 40 to 90 cm2
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
  • the absorbent body of the present invention includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order.
  • the absorber of the present invention has a thickness of 4.0 mm or less. Since the thickness of the absorbent body is 4.0 mm or less, when the absorbent body of the present invention is used in sanitary material products such as diapers, the sanitary material product using the absorbent body of the present invention becomes flexible and does not have a stiff feeling. This suppresses the wear and tear, and provides an excellent feeling of wearing. For the reason that the sanitary material product is more comfortable to wear, the absorber is preferably thinner, and the thickness of the absorber is preferably 3 mm or less. On the other hand, the thickness of the absorber is preferably 1 mm or more in order to improve the absorption characteristics of the absorber. In addition, the thickness of the absorber referred to herein refers to the thickness measured based on JIS L1913 (1998) 6.1.2 A method.
  • the first nonwoven fabric and the first water-absorbing polymer group form the first layer
  • the third non-woven fabric and the second water-absorbing polymer group form the second layer.
  • the first water-absorbing polymer group is directly or indirectly fixed to the first non-woven fabric
  • the second water-absorbing polymer group is directly or indirectly fixed to the third non-woven fabric.
  • the first layer formed of the first nonwoven fabric and the first water-absorbing polymer group may be simply referred to as "the first layer.”
  • the second layer formed of the third nonwoven fabric and the second water-absorbing polymer group may be simply referred to as "the second layer”.
  • the absorbent body of the present invention is used in a sanitary material product, the first layer side becomes the surface to be used on the skin side, and the second layer side becomes the surface opposite to the surface to be used on the skin side.
  • the liquid diffusion area of the first layer is 40 to 90 cm 2 .
  • the liquid diffusion area means that after passing 5 ml of physiological saline from the first nonwoven fabric side to the other side in the vertical direction from the first nonwoven fabric to the third nonwoven fabric of the absorber, This refers to the diffusion area of physiological saline on the surface of the nonwoven fabric No. 3 on the first nonwoven fabric side in the vertical direction. More specifically, it refers to what is measured by the method described in the measurement method section of Examples.
  • the second nonwoven fabric in contact with the first layer can improve the diffusivity of liquids such as urine, and also improve the efficiency of absorbing urine and the like of the first water-absorbing polymer forming the first layer.
  • the liquid diffusion area of the first layer is preferably 45 cm 2 or more, more preferably 50 cm 2 or more.
  • the first layer The liquid diffusion area is more preferably 85 cm 2 or less, and even more preferably 80 cm 2 or less.
  • the types of fibers constituting the first nonwoven fabric, the basis weight of the first nonwoven fabric, the type of the first nonwoven fabric, the entanglement conditions in the process, manufacturing method of the first web, type of the first water-absorbing polymer, particle diameter of the first water-absorbing polymer, basis weight of the first water-absorbing polymer group, gel passing rate of the first water-absorbing polymer examples include adjusting the type of adhesive and the amount of adhesive used.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0, and the liquid diffusion area of the second nonwoven fabric is divided by the liquid diffusion area of the first layer.
  • the value divided by the liquid diffusion area is 1.1 to 2.5.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is set to 1.1 to 2.0, and the liquid diffusion area of the second nonwoven fabric is divided by the liquid diffusion area of the second layer.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is preferably 1.2 or more, and 1.8 or less. It is preferable that Further, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is preferably 1.4 or more, and preferably 2.0 or less. Furthermore, since liquid flows from top to bottom due to gravity, the amount of liquid that transfers from the second nonwoven fabric to the second layer is greater than the amount of liquid that transfers from the second nonwoven fabric to the first layer. Become. Therefore, by making the liquid diffusion area of the first layer larger than the liquid diffusion area of the second layer, the absorption characteristics of the absorbent body of the present invention become more excellent.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is more preferably 1.3 or more, and more preferably 1.5 or less. Further, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is more preferably 1.6 or more, and more preferably 1.8 or less. In addition, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer are calculated as follows.
  • the means for determining the range include the type of fibers constituting the nonwoven fabric, the basis weight of the nonwoven fabric, the type of nonwoven fabric, the entangling conditions for forming the nonwoven fabric, the manufacturing method of the web, the type of water-absorbing polymer, the particle size of the water-absorbing polymer, and the basis weight of the water-absorbing polymer group. Examples include adjusting the gel flow rate of the first water-absorbing polymer, the saturated absorption amount of the second water-absorbing polymer, the shape of the second water-absorbing polymer, the type of adhesive, and the amount of adhesive used.
  • examples of the material for fixing the water-absorbing polymer group necessary to form the first layer and the second layer to the nonwoven fabric include hot melt adhesives and heat-fusible resin powders.
  • the hot melt adhesive styrene hot melt adhesives or olefin hot melt adhesives suitable for sanitary material products can be suitably used.
  • the heat-fusible resin powder polyethylene powder or ethylene-vinyl acetate copolymer powder can be preferably used from the viewpoint that heat-fusion can be performed at a relatively low temperature. .
  • a hot melt adhesive is more preferable because it can be fixed with a low basis weight.
  • the amount of hot melt adhesive to be sprayed in each layer of the first layer and the second layer is preferably 0.5 to 10.0 g/m 2 . Since the water-absorbing polymer can be fixed on the nonwoven fabric, it is more preferable that the amount of hot melt adhesive to be sprayed is 1.0 g/m 2 or more. On the other hand, the amount of hot melt adhesive to be sprayed is preferably 4.0 g/m 2 or less, and 3.0 g/m It is more preferably 2 or less, particularly preferably 2.5 g/m 2 or less.
  • the absorbent body of the present invention is preferably in the form of a substantially rectangular sheet, similar to the absorbent body used in known sanitary material products such as diapers.
  • the absorption amount is 125 g or more.
  • the amount of absorption in the present invention refers to the weight of saline absorbed by the absorber until it leaks out from the side surface of the lower end of the sample when saline is dropped at an angle of 45°. More specifically, it refers to what is measured by the method described in the measurement method section of Examples.
  • the absorption amount of the absorber is more preferably 150 g or more, and even more preferably 175 g or more.
  • Examples of means for obtaining such an absorbent body include using the materials described in Example 1 and the like and employing the manufacturing method described in Example 1.
  • one or more types selected from the group consisting of the liquid diffusion area of the first layer, the liquid diffusion area of the second nonwoven fabric, the liquid diffusion area of the second layer, and the content of hydrophilic fibers in the second nonwoven fabric may be selected as appropriate.
  • the absorption amount of the absorber can be adjusted to fall within the above range.
  • An absorbent body is obtained by fixing a water-absorbing polymer group between the first nonwoven fabric and the second nonwoven fabric, and between the second nonwoven fabric and the third nonwoven fabric.
  • a hot melt adhesive is uniformly spread on one surface of the third nonwoven fabric in a spray form or a spiral form.
  • the second water-absorbing polymer is uniformly sprinkled thereon.
  • one side of the second nonwoven fabric is crimped onto it.
  • the first water-absorbing polymer is uniformly sprayed on the other surface of the second nonwoven fabric (the surface on which the second water-absorbing polymer is not sprayed).
  • a hot melt adhesive is sprayed or spirally distributed on one surface of the first nonwoven fabric.
  • the second non-woven fabric is spread over the first water-absorbing polymer group.
  • the second non-woven fabric is covered with a heat-fusible resin powder and a second water-absorbing polymer, which is uniformly mixed in advance.
  • a third nonwoven fabric may be placed over the second water-absorbing polymer group, heated to a temperature equal to or higher than the melting point of the heat-fusible powder, and bonded by thermocompression.
  • the absorbent body of the present invention cut into a rectangular shape is sandwiched and fixed between a top sheet and a back sheet, which are also rectangular in shape and have a larger area than the absorbent body.
  • the top sheet side is the surface to be used on the skin side
  • the back sheet is the surface on the opposite side from the surface to be used on the skin side.
  • the absorbent body is sandwiched between the top sheet and the back sheet so that the first nonwoven fabric of the absorbent body is in contact with the top sheet.
  • the first nonwoven fabric has a feature that allows water-based liquids to easily permeate from one surface of the first nonwoven fabric to the other surface.
  • the liquid quickly passes through the first nonwoven fabric, is absorbed by the water-absorbing polymer, and is easily retained. Therefore, the absorption characteristics of the absorber can be improved.
  • Methods for fixing the parts where the top sheet and the absorber, the back sheet and the absorber, and the top sheet and the back sheet are in direct contact include methods using hot melt adhesives and methods using heat-fusible resin powder. Can be done.
  • a nonwoven fabric as the surface sheet used when making the absorbent body of the present invention into a sanitary material product, from the viewpoint of better liquid permeability and tactility.
  • a wet nonwoven fabric or In addition to resin bond dry nonwoven fabrics, thermal bond dry nonwoven fabrics, spunbond dry nonwoven fabrics, needle punch dry nonwoven fabrics, water jet punch dry nonwoven fabrics, flash spinning dry nonwoven fabrics, etc., paper making with uniform basis weight and thickness is possible.
  • Nonwoven fabrics produced by this method can also be preferably used.
  • the back sheet used when the absorbent body of the present invention is used as a sanitary material product is selected from the viewpoints of providing comfort to the wearer by releasing water vapor accumulated inside the sanitary material product to the outside, and waterproofing.
  • a laminated sheet of a moisture-permeable waterproof film and a nonwoven fabric is preferred from the viewpoint of providing excellent properties and texture.
  • the above-mentioned moisture-permeable waterproof film include porous polyethylene film, moisture-permeable urethane film, and moisture-permeable polyester elastomer film.
  • nonwoven fabric a nonwoven fabric similar to that of the top sheet can be used, but a spunbond type dry nonwoven fabric is preferable from the viewpoint of cost and strength.
  • the gripping portion of this sample was attached to the grips of a tensile tester (Tensilon Universal Testing Machine Model RTG-1210, manufactured by Orientech Co., Ltd.) and pulled at a gripping interval of 10mm and a tensile speed of 10mm/min.
  • the maximum load in the load (N) curve was defined as the single fiber strength (N). Measurements were performed on 10 samples for each sample, and the average value was calculated.
  • the presence of the water-absorbing polymer is determined for the sieve with the largest opening among the sieves in which the presence of the water-absorbing polymer is confirmed in an amount of 5% or more of the charged amount of 5.00 g.
  • the opening of the sieve whose first stage opening was larger than that of the sieve was taken as the upper limit of the particle size of the water-absorbing polymer.
  • the largest opening of the sieve is 425 ⁇ m.
  • the upper limit of the particle size of the water-absorbing polymer is set to 500 ⁇ m, which is the first stage opening larger than that of the sieve, and the particle size of the water-absorbing polymer is 500 ⁇ m or less.
  • the opening of the sieve is set to the particle size of the water-absorbing polymer. This was taken as the lower limit.
  • the tray was considered to be a sieve with an opening of 0 ⁇ m.
  • the smallest opening of the sieve is 106 ⁇ m.
  • the lower limit of the particle size of the water-absorbing polymer is 106 ⁇ m, and the particle size of the water-absorbing polymer exceeds 106 ⁇ m.
  • the area (cm 2 ) of the blue portion was calculated by relative comparison from the scale of the ruler in the photograph. Then, the average value of the areas of the five samples was calculated and defined as the liquid diffusion area (cm 2 ) in the present invention. Note that the temperature of the physiological saline used and the measurement atmosphere was 25 ⁇ 2°C.
  • Thickness of absorber Based on JIS L1913 (1998) 6.1.2 A method, measure the thickness of the sample using a thickness measuring device (TECLOCK constant pressure thickness measuring device, model: PG11J) did. The measurement was performed on each test piece (5 pieces), and the average value was calculated, which was taken as the thickness (mm) of the absorber.
  • TECLOCK constant pressure thickness measuring device model: PG11J
  • Example 1 (First nonwoven fabric) Short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 20 g/m 2 using a waver. .
  • 70% by mass of short fibers made of the above rayon and hollow short fibers made of polyethylene terephthalate (fiber diameter: 30 ⁇ m, fiber length: 51 mm, single fiber strength: 0.30 N, hereinafter sometimes referred to as "short fiber A”) ) 30% by mass was mixed with a card, opened, and then made into a cross web with a basis weight of 20 g/m 2 using a Weber.
  • the obtained parallel web and cross web are overlapped (cris cross web), and a high pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 40 g/ m2 .
  • a first nonwoven fabric a was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric a was 15% by mass with respect to the entire first nonwoven fabric a. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric a was 85% by mass with respect to the entire first nonwoven fabric a.
  • styrene hot melt is sprayed onto the first surface at a concentration of 2 g/ m2 , and the first water absorbing polymer (SDP Global NS300) was uniformly sprinkled to give a basis weight of 100 g/m 2 .
  • SDP Global NS300 the first water absorbing polymer
  • one side of the second nonwoven fabric was placed thereon and crimped.
  • styrene-based hot melt was sprayed on one side of the third nonwoven fabric at a rate of 2 g/m 2 , and a second water-absorbing polymer (SA60S manufactured by Sumitomo Seika Chemical Co., Ltd.) was applied thereon with a basis weight of 150 g.
  • the other surface of the second nonwoven fabric (the surface opposite to the surface on which the first water-absorbing polymer was sprayed) was placed on the third non-woven fabric so that it was in contact with the second water-absorbing polymer that had been sprayed, and the third non-woven fabric was crimped.
  • the first water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric.
  • the second water-absorbing polymer group is directly or indirectly fixed to the third nonwoven fabric.
  • the obtained product was cut into a rectangular shape with a long side of 20 cm and a short side of 10 cm to obtain a rectangular absorbent body. Table 1 shows the structure and performance of this absorber. The thickness of this absorber was 2.0 mm, the absorption amount was 175 g, and it was thin and had excellent absorption characteristics.
  • Example 2 (First nonwoven fabric) Short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 10 g/m 2 using a waver. . In addition, 40% by mass of the above-mentioned short fibers made of rayon and 60% by mass of short fibers made of short fiber A were mixed with a card, opened, and then made into a cross web with a basis weight of 10 g/m 2 using a waver.
  • the obtained parallel web and cross web are overlapped (cris cross web), and a high-pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 20 g/ m2 .
  • a first nonwoven fabric b was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric b was 30% by mass with respect to the entire first nonwoven fabric b. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric b was 70% by mass with respect to the entire first nonwoven fabric b.
  • Example 3 (First nonwoven fabric) Short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 25 g/m 2 using a waver. . In addition, 80% by mass of the above-mentioned short fibers made of rayon and 20% by mass of short fibers made of short fiber A were mixed with a card, opened, and then made into a cross web with a basis weight of 25 g/m 2 using a waver.
  • the obtained parallel web and cross web are overlapped (cris cross web), and a high-pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 50 g/ m2 .
  • a first nonwoven fabric c was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric c was 10% by mass with respect to the entire first nonwoven fabric c. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric c was 90% by mass with respect to the entire first nonwoven fabric c.
  • Example 4 (Third nonwoven fabric) Short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a fabric weight of 25 g/m 2 using a Weber. A cross web with an amount of 25 g/m 2 was prepared. The obtained parallel web and cross web were overlapped, entangled by applying a high-pressure water stream, and dried at 150°C for 3 minutes to obtain a third nonwoven fabric d, which becomes a spunlace nonwoven fabric with a basis weight of 50 g/m 2 . .
  • Example 5 (Third nonwoven fabric) After mixing 70% by mass of short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51mm, single fiber strength: 0.04N) and 30% by mass of short fibers made of short fiber A with a card, and opening the fibers.
  • a parallel web with a basis weight of 10 g/m 2 and a cross web with a basis weight of 10 g/m 2 were prepared using Weber.
  • the obtained parallel web and cross web were layered, entangled by applying a high-pressure water stream, and dried at 150°C for 3 minutes to obtain a third nonwoven fabric e, which becomes a spunlace nonwoven fabric with a basis weight of 20 g/m 2 . .
  • Example 6 An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 20 g/m 2 . Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 1.9 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
  • Example 7 An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 50 g/m 2 .
  • Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 2.2 mm, the absorption amount was 160 g, and it was thin and had excellent absorption characteristics.
  • Example 8 An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 15 g/m 2 .
  • Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 140 g, and it was thin and had excellent absorption characteristics.
  • Example 9 An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 60 g/m 2 .
  • Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 2.3 mm, the absorption amount was 145 g, and it was thin and had excellent absorption characteristics.
  • Example 10 The proportion of short fibers A contained in the first nonwoven fabric is changed to 5% by mass with respect to the whole of the first nonwoven fabric, and the proportion of short fibers made of rayon contained in the first nonwoven fabric is changed to 5% by mass with respect to the whole of the first nonwoven fabric.
  • An absorber was obtained in the same manner as in Example 1 except that the content was changed to 95% by mass. Table 2 shows the structure and performance of this absorber. The thickness of this absorbent body was 1.9 mm, the absorption amount was 165 g, and it was thin and had excellent absorption characteristics.
  • Example 11 The proportion of short fibers A contained in the first nonwoven fabric is changed to 40% by mass with respect to the whole of the first nonwoven fabric, and the proportion of short fibers made of rayon contained in the first nonwoven fabric is changed to 40% by mass with respect to the whole of the first nonwoven fabric.
  • An absorber was obtained in the same manner as in Example 1 except that the amount was changed to 60% by mass. Table 2 shows the structure and performance of this absorber. The thickness of this absorbent body was 2.2 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
  • Example 12 An absorber was prepared in the same manner as in Example 1, except that the proportion of short fibers made of rayon contained in the first nonwoven fabric was changed to 100% by mass (not including short fibers A) based on the entire first nonwoven fabric. Obtained. Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
  • Example 13 The proportion of short fibers A contained in the first nonwoven fabric is changed to 50% by mass with respect to the whole of the first nonwoven fabric, and the proportion of short fibers made of rayon contained in the first nonwoven fabric is changed to 50% by mass with respect to the whole of the first nonwoven fabric.
  • An absorber was obtained in the same manner as in Example 1 except that the amount was changed to 50% by mass. Table 3 shows the structure and performance of this absorber. The thickness of this absorbent body was 2.4 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
  • Example 14 An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the first water-absorbing polymer was changed to 50 g/m 2 . Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
  • Example 15 An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the first water-absorbing polymer was changed to 25 g/m 2 . Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.7 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
  • Example 16 (First nonwoven fabric) Short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 15 g/m 2 using a waver. . In addition, 40% by mass of the above-mentioned short fibers made of rayon and 60% by mass of short fibers made of short fiber A were mixed with a card, opened, and then made into a cross web with a basis weight of 15 g/m 2 using a waver.
  • the obtained parallel web and cross web are layered (cris cross web), and a high-pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 30 g/ m2 .
  • a first nonwoven fabric p was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric p was 30% by mass with respect to the entire first nonwoven fabric p. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric p was 70% by mass with respect to the entire first nonwoven fabric p.
  • Example 17 An absorbent body was obtained in the same manner as in Example 7 except that the first nonwoven fabric was changed to the first nonwoven fabric p. Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 2.1 mm, the absorption amount was 145 g, and it was thin and had excellent absorption characteristics.
  • Example 1 An absorbent body was obtained in the same manner as in Example 1, except that the second nonwoven fabric was changed to an air-through nonwoven fabric (made of polypropylene, basis weight 50 g/m 2 , thickness 4.0 mm). Table 4 shows the structure and performance of this absorber. The thickness of this absorbent body was 5.0 mm, the absorption amount was 95 g, and it was bulky (thick) and had poor absorption characteristics.
  • a first nonwoven fabric ca was obtained by calendering the first nonwoven fabric c (cylinder pressure: 4 kgf/cm 2 , roller temperature: 20° C., speed: 1 m/min).
  • Example 18 An absorbent body was obtained in the same manner as in Example 1, except that the amount of hot melt sprayed on the first nonwoven fabric and the third nonwoven fabric was changed to 4 g/m 2 .
  • Table 5 shows the structure and performance of this absorber. The thickness of this absorber was 1.9 mm, the absorption amount was 160 g, and it was thin and had excellent absorption characteristics.
  • Example 19 An absorbent body was obtained in the same manner as in Example 1, except that the amount of hot melt sprayed on the first nonwoven fabric and the third nonwoven fabric was changed to 10 g/m 2 .
  • Table 5 shows the structure and performance of this absorber. The thickness of this absorber was 1.7 mm, the absorption amount was 130 g, and it was thin and had excellent absorption characteristics.
  • Example 20 (Second nonwoven fabric) Short fibers made of rayon (fiber diameter: 13 ⁇ m, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 30 g/m 2 using a waver. . The obtained parallel web was entangled with a high-pressure water stream and dried at 150° C. for 3 minutes to obtain a second nonwoven fabric f, which is a spunlace nonwoven fabric with a basis weight of 30 g/m 2 .
  • the absorbers of Examples 1 to 20 and the absorbers of Comparative Examples 1 to 2 were compared.
  • the second nonwoven fabric was composed only of hydrophilic fibers
  • the absorbers of Comparative Examples 1 to 2 were composed only of hydrophobic fibers. It was to be done.
  • the absorbers of Comparative Examples 1 to 2 the liquid diffusivity of the second nonwoven fabric was inferior to that of the first layer and the second layer, whereas the absorbers of Examples 1 to 20 had The liquid diffusibility of the second nonwoven fabric was superior to that of the first layer and the second layer.
  • the absorption properties of the absorbers of Examples 1 to 20 were superior to those of Comparative Examples 1 and 2.
  • the thickness of the absorber of Examples 1 to 20 is significantly thinner than that of Comparative Example 1.
  • the absorbers of Examples 1 to 20 and the absorber of Comparative Example 3 were compared. Focusing on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, the absorber of Comparative Example 3 shows that the liquid diffusion area of the first layer is smaller than the liquid diffusion area of the second nonwoven fabric. was extremely small, whereas in the absorbers of Examples 1 to 20, the liquid diffusion area of the first layer was appropriately small compared to the liquid diffusion area of the second nonwoven fabric. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of the absorber of Comparative Example 3.
  • the absorbers of Examples 1 to 20 and the absorber of Comparative Example 4 were compared. Focusing on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, it is found that in the absorber of Comparative Example 4, the liquid diffusion area of the second nonwoven fabric is larger than the liquid diffusion area of the first layer. In contrast, in the absorbers of Examples 1 to 20, the liquid diffusion area of the second nonwoven fabric was superior to that of the first layer. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of the absorber of Comparative Example 4.
  • the absorbers of Examples 1 to 20 and the absorber of Comparative Example 5 were compared. Focusing on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer, the absorber of Comparative Example 5 has a liquid diffusion area of the second layer that is smaller than the liquid diffusion area of the second nonwoven fabric. In contrast, in the absorbers of Examples 1 to 20, the liquid diffusion area of the second layer was appropriately small compared to the liquid diffusion area of the second nonwoven fabric. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of the absorber of Comparative Example 5.
  • the liquid diffusion area of the first layer of the absorber of Example 1 is larger than that of the first layer of the absorber of Example 2, and the liquid diffusion area of the second nonwoven fabric is larger than that of the first layer of the absorber of Example 2.
  • the value divided by the liquid diffusion area of the first layer is appropriately smaller in the absorber of Example 1 than in the absorber of Example 2.
  • the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 2.
  • the absorber of Example 1 and the absorber of Example 3 were compared.
  • the liquid diffusion area of the first layer included in the absorber of Example 1 is moderately smaller than the liquid diffusion area of the first layer included in the absorber of Example 3. It was possible to further suppress liquid leakage from the layer. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 3.
  • the absorbent body of Example 1 and the absorbent body of Example 4 were compared.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is moderately larger for the absorber of Example 1 than for the absorber of Example 4. In this case, it was possible to further suppress liquid leakage from the second layer. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 4.
  • the absorbent body of Example 1 and the absorbent body of Example 5 were compared.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is moderately smaller for the absorber of Example 1 than for the absorber of Example 5.
  • the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 5.
  • the absorber of Example 1 and the absorbers of Examples 16 and 17 were compared.
  • the absorbers of Examples 16 and 17 had the following values: the liquid diffusion area of the second nonwoven fabric divided by the liquid diffusion area of the first layer, and the liquid diffusion area of the second nonwoven fabric divided by the liquid diffusion area of the second layer.
  • the liquid diffusion area of the second nonwoven fabric was greater than the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer.
  • the value divided by the liquid diffusion area of the first layer is smaller.
  • the absorption properties of the absorber of Example 1 were superior to those of the absorbers of Examples 16 and 17.
  • the absorber of Example 1 and the absorbers of Examples 18 and 19 were compared.
  • the amount of adhesive sprayed in each of the first layer and the second layer is appropriately smaller in the absorbent body of Example 1 than in the absorbent bodies of Examples 18-19.
  • the liquid diffusion area of the first layer included in the absorbent body of Example 1 is moderately larger than the liquid diffusion area of the first layer included in the absorbent body of Examples 18 to 19. It was possible to improve the absorption amount of urine, etc. of the water-absorbing polymer in the first layer and the first nonwoven fabric itself. Further, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is appropriately smaller in the absorbent body of Example 1 than in the absorbent bodies of Examples 18 and 19.
  • the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is appropriately smaller in the absorbent body of Example 1 than in the absorbent bodies of Examples 18 and 19.
  • the absorption properties of the absorber of Example 1 were superior to those of the absorbers of Examples 18-19.
  • the absorbent body of the present invention is an absorbent body with excellent absorption properties, and can be suitably used as various sanitary material products such as tape-type disposable diapers, pants-type disposable diapers, sanitary napkins, and urine absorbing pads.

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  • Absorbent Articles And Supports Therefor (AREA)

Abstract

In order to obtain an absorbent and a sanitary material product that are thin and have excellent absorbing characteristics due to high utilizing efficiency of absorbent polymer provided between non-woven fabrics, the absorbent of the present invention comprises, in the following order: a first non-woven fabric; first water-absorbing polymers; a second non-woven fabric; second water-absorbing polymers; and a third non-woven fabric, and has a thickness of 4.0 mm or less, first water-absorbing polymers are fixed to the first non-woven fabric to form a first layer, the second water-absorbing polymers are fixed to the third non-woven fabric to form a second layer, the second non-woven fabric contains 60% by mass or more hydrophilic fibers relative to the entire second non-woven fabric, the first layer has a liquid diffusion area of 40-90 cm2, the result of the liquid diffusion area of the second non-woven fabric divided by the liquid diffusion area of the first layer is 1.1-2.0, and the result of the liquid diffusion area of the second non-woven fabric divided by the liquid diffusion area of the second layer is 1.1-2.5.

Description

吸収体および衛生材料製品Absorbent and sanitary material products
　本発明は、吸収体および衛生材料製品に関する。 The present invention relates to absorbent bodies and sanitary material products.
　紙おむつやナプキン等の衛生材料製品は、尿や経血等（以下、尿等と称することがある）の水系液体を吸収し保水するシート状の吸収体、吸収体の一方の面に配置された表面シートおよび吸収体の他方の面に配置された裏面シートを有している。上記の表面シートは尿等の透過性を有し、上記の裏面シートは尿等の防漏性を有する。また、上記の吸収体は、パルプ繊維と吸水ポリマーの混合物が不織布またはティッシュ等で包まれた構成となっている。 Sanitary material products such as disposable diapers and napkins are made of sheet-like absorbents that absorb and retain water-based liquids such as urine and menstrual blood (hereinafter sometimes referred to as urine), and are made of sheet-like absorbents placed on one side of the absorber. It has a top sheet and a back sheet placed on the other side of the absorbent body. The above-mentioned top sheet has permeability to urine and the like, and the above-mentioned back sheet has leak-proof property to urine and the like. Moreover, the above-mentioned absorbent body has a structure in which a mixture of pulp fibers and a water-absorbing polymer is wrapped in a nonwoven fabric, tissue, or the like.
　そして、衛生材料製品において、吸収体、表面シートおよび裏面シートは、上記の衛生材料製品の着用時に、着用者に近い方から表面シート、吸収体および裏面シートの順に配置されている。 In the sanitary material product, the absorbent body, the top sheet, and the back sheet are arranged in the order of the top sheet, the absorbent body, and the back sheet from the side closest to the wearer when the sanitary material product is worn.
　ここで、近年、紙おむつやナプキン等の衛生材料製品の普及に伴い、衛生材料製品は薄型化による着用感の向上が望まれるようになってきているが、従来のパルプ繊維を用いる吸収体では嵩高になって薄くできないという問題があった。 In recent years, with the spread of sanitary material products such as disposable diapers and napkins, there has been a desire for sanitary material products to be thinner and more comfortable to wear, but conventional absorbent materials using pulp fibers are bulky. There was a problem that it could not be made thinner.
　そこで、吸収体にパルプ繊維を用いない薄型化吸収体として、第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布の順に構成された吸収体が知られている（例えば、特許文献１参照）。 Therefore, as a thin absorbent body that does not use pulp fibers in the absorbent body, an absorbent fabric composed of a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order. body is known (for example, see Patent Document 1).
国際公開第２０１９／１９８８２１号公報International Publication No. 2019/198821
　しかしながら、従来の吸収体には以下の課題があることを本発明者らは見出した。上記のとおり、特許文献１に記載の吸収体は、吸収体に嵩高いパルプ繊維を用いず、第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布の順に構成された吸収体である。また、この吸収体は、第２の不織布にエアスルー不織布が用いられている。しかし、エアスルー不織布は空隙が広く吸水ポリマーがエアスルー不織布内に入り込み易く、入り込んだ吸水ポリマーが尿等を吸水し膨潤すると、エアスルー不織布における液拡散性を阻害し、結果として吸収体の全体の吸収特性が不十分であるとの課題がある。また、第１の不織布と第１の吸水ポリマー群で形成される第１の層および第３の不織布と第２の吸水ポリマー群で形成される第２の層のそれぞれの液拡散性と第２の不織布の液拡散性との関係性について何ら考慮されておらず、吸収体の全体の吸収特性が不十分であるとの課題がある。 However, the present inventors have discovered that conventional absorbers have the following problems. As described above, the absorbent body described in Patent Document 1 does not use bulky pulp fibers in the absorbent body, and includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a This is an absorbent body constructed of three nonwoven fabrics in this order. Further, in this absorbent body, an air-through nonwoven fabric is used as the second nonwoven fabric. However, the air-through nonwoven fabric has wide pores and the water-absorbing polymer easily enters into the air-through non-woven fabric, and when the water-absorbing polymer that enters absorbs water such as urine and swells, it impedes the liquid diffusivity in the air-through nonwoven fabric, resulting in the overall absorption properties of the absorbent body. There is an issue of insufficient capacity. In addition, the liquid diffusivity of each of the first layer formed of the first nonwoven fabric and the first water-absorbing polymer group and the second layer formed of the third non-woven fabric and the second water-absorbing polymer group and the second However, there is no consideration given to the relationship between the nonwoven fabric and the liquid diffusivity of the nonwoven fabric, and there is a problem that the overall absorption characteristics of the absorbent body are insufficient.
　そこで、本発明は、上記の事情に鑑み、薄型であり、かつ、不織布間に配置された吸収ポリマーの高い活用効率により吸収特性に優れた吸収体および衛生材料製品を提供することを課題とする。 Therefore, in view of the above-mentioned circumstances, it is an object of the present invention to provide an absorbent body and sanitary material product that is thin and has excellent absorption characteristics due to the high utilization efficiency of the absorbent polymer arranged between the nonwoven fabrics. .
　本発明は、前記課題を解決するために、本発明の吸収体および衛生材料製品は次のようなものである。
すなわち、
（１）第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布を、この順に備え、かつ、厚さが４．０ｍｍ以下の吸収体であり、
前記第１の不織布および前記第１の吸水ポリマー群は、第１の層を形成しており、
前記第３の不織布および前記第２の吸水ポリマー群は、第２の層を形成しており、
前記第１の吸水ポリマー群は、第１の不織布に直接的または間接的に固定されており、
前記第２の吸水ポリマー群は、第３の不織布に直接的または間接的に固定されており、
前記第２の不織布は、親水性繊維を前記第２の不織布の全体に対して６０質量％以上、含有しており、
前記第１の層の液拡散面積は、４０～９０ｃｍ２であり、
前記第２の不織布の液拡散面積を前記第１の層の液拡散面積で除した値は、１．１～２．０であり、
前記第２の不織布の液拡散面積を前記第２の層の液拡散面積で除した値は、１．１～２．５である、
吸収体であり、
（２）前記親水性繊維がレーヨン繊維である、（１）の吸収体であることが好ましく、
（３）前記第２の不織布の目付量が、２０～５０ｇ／ｍ２であり、
（１）または（２）の吸収体であることが好ましく、
（４）前記第１の不織布は、単繊維強度が０．１５Ｎ以上である短繊維Ａを含み、
前記短繊維Ａの含有量が、前記第１の不織布の全体に対し５～４０質量％である、
（１）～（３）のいずれかの吸収体であることが好ましく、
（５）前記第１の吸水ポリマー群の目付量が、５０～４００ｇ／ｍ２である、（１）～（４）のいずれかの吸収体であることが好ましく、
（６）前記第２の吸水ポリマー群に含まれる吸水ポリマーの飽和吸収量が、２５～７０ｇ／ｇである、（１）～（５）のいずれかの吸収体であることが好ましく
（７）（１）～（６）のいずれかの吸収体を備える、衛生材料製品であることが好ましい。 In order to solve the above problems, the present invention provides an absorbent body and sanitary material products as follows.
That is,
(1) An absorbent body comprising a first non-woven fabric, a first water-absorbing polymer group, a second non-woven fabric, a second water-absorbing polymer group and a third non-woven fabric in this order and having a thickness of 4.0 mm or less. can be,
The first nonwoven fabric and the first water-absorbing polymer group form a first layer,
The third nonwoven fabric and the second water-absorbing polymer group form a second layer,
The first water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric,
The second water-absorbing polymer group is directly or indirectly fixed to the third nonwoven fabric,
The second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric,
The liquid diffusion area of the first layer is 40 to 90 cm 2 ,
The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0,
The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
It is an absorber,
(2) Preferably, the absorbent body according to (1), wherein the hydrophilic fiber is a rayon fiber,
(3) the second nonwoven fabric has a basis weight of 20 to 50 g/m 2 ;
It is preferable that it is an absorber according to (1) or (2),
(4) the first nonwoven fabric includes short fibers A having a single fiber strength of 0.15N or more,
The content of the short fibers A is 5 to 40% by mass based on the entire first nonwoven fabric,
It is preferable that the absorber is one of (1) to (3),
(5) Preferably, the absorbent body according to any one of (1) to (4), wherein the first water-absorbing polymer group has a basis weight of 50 to 400 g/m 2 .
(6) Preferably, the absorber according to any one of (1) to (5) has a saturated absorption amount of the water-absorbing polymer included in the second water-absorbing polymer group of 25 to 70 g/g. Preferably, the sanitary material product includes the absorbent body according to any one of (1) to (6).
　本発明によれば、薄型であり、かつ、吸収特性に優れる吸収体および衛生材料製品を提供することができる。 According to the present invention, it is possible to provide an absorbent body and sanitary material product that is thin and has excellent absorption properties.
　以下、本発明の実態の形態について詳細に説明する。 Hereinafter, the actual form of the present invention will be explained in detail.
　本発明の吸収体は、第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布を、この順に備え、かつ、厚さが４．０ｍｍ以下の吸収体である。また、前記第１の不織布および前記第１の吸水ポリマー群は、第１の層を形成しており、前記第３の不織布および前記第２の吸水ポリマー群は、第２の層を形成しており、前記第１の吸水ポリマー群は、第１の不織布に直接的または間接的に固定されており、前記第２の吸水ポリマー群は、第３の不織布に直接的または間接的に固定されている。また、前記第２の不織布は、親水性繊維を前記第２の不織布の全体に対して６０質量％以上、含有している。また、前記第１の層の液拡散面積は、４０～９０ｃｍ２であり、前記第２の不織布の液拡散面積を前記第１の層の液拡散面積で除した値は、１．１～２．０であり、前記第２の不織布の液拡散面積を前記第２の層の液拡散面積で除した値は、１．１～２．５である。そして、これらの特長の全てを具備する本発明の吸収体は、薄型であり、かつ、吸収特性に優れるものとなる。 The absorbent body of the present invention includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order, and has a thickness of 4.0 mm or less. It is an absorbent material. Further, the first nonwoven fabric and the first water-absorbing polymer group form a first layer, and the third non-woven fabric and the second water-absorbing polymer group form a second layer. The first water-absorbing polymer group is directly or indirectly fixed to a first non-woven fabric, and the second water-absorbing polymer group is directly or indirectly fixed to a third non-woven fabric. There is. Further, the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric. The liquid diffusion area of the first layer is 40 to 90 cm 2 , and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2. .0, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5. The absorbent body of the present invention having all of these features is thin and has excellent absorption properties.
　上記の効果が得られるメカニズムについては、以下のとおりと推測する。すなわち、本発明の吸収体は、第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布を、この順に備え、前記第１の不織布および前記第１の吸水ポリマー群が、第１の層を形成しており、前記第３の不織布および前記第２の吸水ポリマー群が、第２の層を形成しており、前記第１の吸水ポリマー群が、第１の不織布に直接的または間接的に固定されており、前記第２の吸水ポリマー群が、第３の不織布に直接的または間接的に固定されている構成であり、さらに、前記第１の層の液拡散面積が、４０～９０ｃｍ２であり、前記第２の不織布の液拡散面積を前記第１の層の液拡散面積で除した値が、１．１～２．０であり、前記第２の不織布の液拡散面積を前記第２の層の液拡散面積で除した値が、１．１～２．５であるとの特徴を備える。 The mechanism by which the above-mentioned effects are obtained is presumed to be as follows. That is, the absorbent of the present invention comprises a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order, the first nonwoven fabric and the first water-absorbing polymer group form a first layer, the third nonwoven fabric and the second water-absorbing polymer group form a second layer, the first water-absorbing polymer group is fixed directly or indirectly to the first nonwoven fabric, and the second water-absorbing polymer group is fixed directly or indirectly to the third nonwoven fabric, and further has the following characteristics: the liquid diffusion area of the first layer is 40 to 90 cm2 , the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
　このような吸収体が、第１の層側が衛生材料製品の着用者側となるように配置されることで、尿等の液体は、吸収体の第１の層側から吸収体に浸入し、第１の層、第２の不織布および第２の層の順に吸収体の内部を進行することになる。このような構成の吸収体において、第２の不織布の液拡散面積が第１の層の液拡散面積や第２の層の液拡散面積よりも大きいものとすることで、本発明の吸収体の吸収特性は優れたものとなる。ここで、層または不織布の液拡散面積の値が大きいほど、その層または不織布の液拡散性はより優れたものとなる。また、層または不織布の液拡散性と、層または不織布の通過時間あたりの液吸収量とはトレードオフの関係にある。ここで、通過時間あたりの液吸収量とは、層または不織布を尿等の液体が透過する間に層または不織布が吸収することができる液体の量を意味する。 By arranging such an absorbent body so that the first layer side faces the wearer of the sanitary material product, liquid such as urine can enter the absorbent body from the first layer side of the absorbent body, The first layer, the second nonwoven fabric, and the second layer proceed inside the absorbent body in this order. In the absorbent body having such a structure, by making the liquid diffusion area of the second nonwoven fabric larger than the liquid diffusion area of the first layer and the liquid diffusion area of the second layer, the absorbent body of the present invention can be improved. The absorption properties will be excellent. Here, the larger the value of the liquid diffusion area of a layer or nonwoven fabric, the better the liquid diffusion property of that layer or nonwoven fabric. Further, there is a trade-off relationship between the liquid diffusivity of the layer or nonwoven fabric and the amount of liquid absorbed per passage time of the layer or nonwoven fabric. Here, the amount of liquid absorbed per passage time means the amount of liquid that a layer or nonwoven fabric can absorb while a liquid such as urine passes through the layer or nonwoven fabric.
　つまり、吸収体の第１の層に到達した液体は、第１の層の内部にて、その面方向に、ある程度拡散されると同時に、第１の層にて、ある程度吸収される。そして、第１の層にて吸収されなかった液体は、第２に不織布に到達し、第２の不織布の内部にて、その面方向に広く拡散される。そして、第２の不織布で吸収されなかった液体の多くは第２の層に移行し、残りの液体は第１の層に移行することになる。ここで、第２の不織布から第１の層や第２の層に移行する液体は、第２の不織布の内部で充分に拡散された上で移行するため、この移行は第１の層や第２の層の広域で行われる。このことにより、第１の層や第２の層の液拡散性が第２の不織布の液拡散性に劣るものであっても、移行する液体は、第１の層や第２の層の面方向に広がって存在する吸水ポリマー群の全体に、ほぼ均等に到達することになる。よって、第１の層や第２の層が有する吸水ポリマーを効率的に利用できるのである。一方で、上記の事情により、第１の層や第２の層の液拡散性は、第２の不織布の液拡散性よりも低くできるため、代わりに第１の層や第２の層の通過時間あたりの液吸収量を高いものとすることができる。 In other words, the liquid that has reached the first layer of the absorbent body is diffused to some extent in the surface direction inside the first layer, and at the same time is absorbed to some extent by the first layer. Then, the liquid that is not absorbed in the first layer reaches the second nonwoven fabric and is widely diffused in the surface direction inside the second nonwoven fabric. Most of the liquid that has not been absorbed by the second nonwoven fabric will transfer to the second layer, and the remaining liquid will transfer to the first layer. Here, since the liquid that transfers from the second nonwoven fabric to the first layer or the second layer is sufficiently diffused inside the second nonwoven fabric, this transfer does not occur in the first layer or the second layer. It is carried out in a wide area of 2 layers. As a result, even if the liquid diffusivity of the first layer or the second layer is inferior to that of the second nonwoven fabric, the liquid that migrates will be transferred to the surface of the first layer or the second layer. The water will almost evenly reach the entire group of water-absorbing polymers that are spread out in this direction. Therefore, the water-absorbing polymer contained in the first layer and the second layer can be efficiently utilized. On the other hand, due to the above-mentioned circumstances, the liquid diffusivity of the first layer and the second layer can be lower than that of the second nonwoven fabric. The amount of liquid absorbed per hour can be increased.
　すなわち、本発明の吸収体が有する、これらの特徴により、本発明の吸収体は、多くの液体を吸収することができる、すなわち、吸収特性に優れたものとなる。 That is, due to these features of the absorbent body of the present invention, the absorbent body of the present invention can absorb a large amount of liquid, that is, has excellent absorption properties.
　ここで、第１の層および第２の層において、吸水ポリマー群は第１の不織布または第２の不織布に、直接的または間接的に固定されているため、吸収体において、第２の不織布の内部に存在する吸収ポリマーの量は極めて少量となる。その結果、第２の不織布の高い液拡散性が担保される。 Here, in the first layer and the second layer, the water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric or the second nonwoven fabric. The amount of absorbing polymer present inside will be extremely small. As a result, high liquid diffusivity of the second nonwoven fabric is ensured.
　また、前記第２の不織布が、親水性繊維を前記第２の不織布の全体に対して６０質量％以上含有していることも、第２の不織布の液拡散性を高いものとすることに寄与している。 Furthermore, the fact that the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric also contributes to the high liquid diffusivity of the second nonwoven fabric. are doing.
　以上のことから、本発明の吸収体は高い吸収特性を備えるため、高い吸収特性を担保するための嵩高いパルプ繊維を含む必要がなく、結果として、厚さが４．０ｍｍ以下の薄型の吸収体とすることができる。 As a result of the above, the absorbent of the present invention has high absorption properties and does not need to contain bulky pulp fibers to ensure high absorption properties, and as a result, it can be made into a thin absorbent with a thickness of 4.0 mm or less.
　（第１～３の不織布）
　本発明の吸収体が備える第１～３の不織布について説明する。 (1st to 3rd nonwoven fabric)
The first to third nonwoven fabrics included in the absorbent body of the present invention will be explained.
　ここで、第１～３の不織布を構成する繊維としては、ポリエチレン繊維、ポリプロピレン繊維等のオレフィン繊維、ポリエチレンテレフタレート繊維、ポリトリメチレンテレフタレート繊維、ポリブチレンテレフタレート繊維等のポリエステル繊維、ナイロン繊維、アクリルニトリル繊維等のアクリル繊維、綿、麻、レーヨン繊維等のセルロース系繊維を挙げることができる。これらの中でも、親水性繊維であることが好ましく、尿等の液拡散性に優れる細繊度化が容易なレーヨン繊維がより好ましい。また、第１～３の不織布は、何れも、尿等の液拡散性の観点からレーヨン繊維を各不織布の全体に対し５０質量％以上含有することが好ましい。 Here, the fibers constituting the first to third nonwoven fabrics include olefin fibers such as polyethylene fibers and polypropylene fibers, polyester fibers such as polyethylene terephthalate fibers, polytrimethylene terephthalate fibers, and polybutylene terephthalate fibers, nylon fibers, and acrylonitrile fibers. Examples include acrylic fibers such as fibers, and cellulose fibers such as cotton, hemp, and rayon fibers. Among these, hydrophilic fibers are preferable, and rayon fibers are more preferable because they have excellent liquid diffusion properties such as urine and can be easily made fine. Further, it is preferable that each of the first to third nonwoven fabrics contains rayon fibers in an amount of 50% by mass or more based on the total weight of each nonwoven fabric, from the viewpoint of diffusibility of liquids such as urine.
　第１～３の不織布の目付量は、何れも、２０～５０ｇ／ｍ２であることが好ましい。不織布の目付量ムラの軽減によって吸水ポリマーを確実に担持することができる、また、繊維本数が増えることによって不織布への尿等の液拡散性を向上することができるとの理由から、第１～３の不織布の目付量は、３０ｇ／ｍ２以上であることがより好ましい。一方で、不織布への尿等の透水性が低下するのを抑制できるとの理由から、第１～３の不織布の目付量は４５ｇ／ｍ２以下であることがより好ましい。 The basis weight of each of the first to third nonwoven fabrics is preferably 20 to 50 g/m 2 . The water-absorbing polymer can be reliably supported by reducing the unevenness in the basis weight of the non-woven fabric, and by increasing the number of fibers, the dispersibility of liquids such as urine into the non-woven fabric can be improved. The basis weight of the nonwoven fabric No. 3 is more preferably 30 g/m 2 or more. On the other hand, it is more preferable that the basis weight of the first to third nonwoven fabrics is 45 g/m 2 or less, since it is possible to suppress a decrease in water permeability of urine or the like into the nonwoven fabric.
　また、第１～３の不織布の種類として、具体的にはサーマルボンド不織布、スパンボンド不織布およびスパンレース不織布を挙げることができる。これらの中でも、バインダーレスで不織布化が可能で、針などの異物混入のリスクを抑えることができ、より衛生材料に適しているとの理由から、第１～３の不織布の種類は、スパンレース不織布であることが好ましい。 Further, specific examples of the types of the first to third nonwoven fabrics include thermal bond nonwoven fabrics, spunbond nonwoven fabrics, and spunlace nonwoven fabrics. Among these, the first to third types of nonwoven fabrics are spunlace because they can be made into nonwoven fabrics without a binder, reduce the risk of contamination with foreign substances such as needles, and are more suitable for sanitary materials. Preferably, it is a nonwoven fabric.
　また、本発明の吸収体が有する第１～３の不織布は、各々同じものであってもよく、異なるものであってもよい。 Further, the first to third nonwoven fabrics included in the absorbent body of the present invention may be the same or different.
　（第１の不織布）
　本発明の吸収体に用いられる第１の不織布について詳述する。 (First nonwoven fabric)
The first nonwoven fabric used in the absorbent body of the present invention will be described in detail.
　ここで、第１の不織布は、衛生材料の表面シート側に配置され、尿等を迅速に吸収させ、第１の不織布で吸収した尿等を拡散させ、第１の吸水ポリマー群の吸水量を向上させる。上記の効果を得ることができるとの観点から、第１の不織布は、単繊維強度が０．１５Ｎ以上である短繊維Ａを含むことが好ましく、短繊維Ａを第１の不織布全体に対して５～４０質量％含有することが好ましく、レーヨン繊維を第１の不織布全体に対して６０～９５質量％含有することが好ましい。短繊維Ａの繊維長は２０～８０ｍｍであることが好ましく、短繊維Ａの素材はポリエステル短繊維およびポリアミド短繊維が好ましく、短繊維Ａは中空繊維であることが好ましい。 Here, the first nonwoven fabric is placed on the top sheet side of the sanitary material, quickly absorbs urine, etc., diffuses the urine etc. absorbed by the first nonwoven fabric, and reduces the amount of water absorbed by the first water absorbing polymer group. Improve. From the viewpoint of being able to obtain the above effects, it is preferable that the first nonwoven fabric contains short fibers A having a single fiber strength of 0.15N or more, and the short fibers A are added to the whole of the first nonwoven fabric. The content of rayon fibers is preferably 5 to 40% by mass, and the content of rayon fibers is preferably 60 to 95% by mass based on the entire first nonwoven fabric. The fiber length of the short fibers A is preferably 20 to 80 mm, the material of the short fibers A is preferably polyester short fibers or polyamide short fibers, and the short fibers A are preferably hollow fibers.
　また、第１の不織布は、単繊維強度が０．１５Ｎ以上である短繊維Ａを含むことが好ましく、短繊維Ａを第１の不織布全体に対して５～４０質量％含有することが好ましい。短繊維とは、繊維長が１０～１００ｍｍの範囲である繊維のことである。後述するカードマシンの通過性の観点から、短繊維Ａの繊維長は２０～８０ｍｍであることがより好ましい。短繊維の単繊維強度とは、短繊維１本について引張試験を行った際に得られる伸び－荷重曲線の最大荷重のことである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。第１の不織布の製造時において、ウォータージェットやカレンダーなどの短繊維を面方向に圧し潰す力が働く工程を経ても、当該短繊維の剛性による反発で、第１の不織布全体の繊維軸を厚さ方向に配向させ易くなることで、不織布が嵩高く、不織布の空隙が大きくなり、結果として、第１の不織布への尿等の吸収速度を速くすることができるとの理由から、第１の不織布は、短繊維Ａを第１の不織布全体に対して１０質量％以上含有することがより好ましい。一方で、第１の不織布への尿等の液拡散性の低下や衛生材料製品における着用感に影響する柔軟性の低下を抑制することができるとの理由から、第１の不織布は、短繊維Ａを第１の不織布全体に対して３５質量％以下含有することがより好ましい。 Further, the first nonwoven fabric preferably contains short fibers A having a single fiber strength of 0.15 N or more, and preferably contains 5 to 40% by mass of short fibers A based on the entire first nonwoven fabric. Short fibers are fibers with a fiber length in the range of 10 to 100 mm. From the viewpoint of passability through a card machine, which will be described later, it is more preferable that the fiber length of short fiber A is 20 to 80 mm. The single fiber strength of short fibers refers to the maximum load on the elongation-load curve obtained when a single short fiber is subjected to a tensile test. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. During the production of the first nonwoven fabric, even if a force is applied to crush the short fibers in the plane direction, such as by water jetting or calendering, the stiffness of the short fibers will cause the fiber axis of the entire first nonwoven fabric to thicken. This is because the nonwoven fabric becomes bulkier and the voids in the nonwoven fabric become larger, and as a result, the rate of absorption of urine, etc. into the first nonwoven fabric can be increased. It is more preferable that the nonwoven fabric contains short fibers A in an amount of 10% by mass or more based on the entire first nonwoven fabric. On the other hand, the first nonwoven fabric is made of short fibers because it can suppress a decrease in the diffusion of liquids such as urine into the first nonwoven fabric and a decrease in flexibility that affects the feeling of wearing sanitary material products. It is more preferable that A is contained in an amount of 35% by mass or less based on the entire first nonwoven fabric.
　また、短繊維Ａの素材としては、ポリエチレン、ポリプロピレン等のポリオレフィン短繊維、ポリエチレンテレフタレート、ポリトリメチレンテレフタレート、ポリブチレンテレフタレート等のポリエステル短繊維、ポリアミド短繊維、アクリルニトリル等のアクリル繊維、を挙げることができる。これらの短繊維の中でも、強度、取扱い性、生産性に優れるとの理由から、ポリエステル短繊維およびポリアミド短繊維が好ましい。さらに、ポリエチレンテレフタレート短繊維およびナイロン６やナイロン６６短繊維がより好ましい。 Examples of the material of the short fiber A include polyolefin short fibers such as polyethylene and polypropylene, polyester short fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, polyamide short fibers, and acrylic fibers such as acrylonitrile. Can be done. Among these short fibers, polyester short fibers and polyamide short fibers are preferred because they have excellent strength, ease of handling, and productivity. Furthermore, polyethylene terephthalate staple fibers and nylon 6 and nylon 66 staple fibers are more preferred.
　また、短繊維Ａは、中空繊維であることが好ましい。中空繊維とすることで、短繊維Ａ自体の嵩が大きくなり、第１の不織布全体の繊維軸を厚さ方向に配向させ易くなり、結果として、第１の不織布の吸収速度を速くすることができ、吸収体の吸収特性を向上させることができる。 Moreover, it is preferable that the short fibers A are hollow fibers. By using hollow fibers, the bulk of the short fibers A itself increases, making it easier to orient the fiber axis of the entire first nonwoven fabric in the thickness direction, and as a result, the absorption rate of the first nonwoven fabric can be increased. It is possible to improve the absorption characteristics of the absorber.
　次に、第１の不織布は、レーヨン繊維を第１の不織布全体に対して６０～９５質量％含有することが好ましい。不織布への尿等の液拡散性が良好なものとなるとの理由から、第１の不織布は、レーヨン繊維を第１の不織布全体に対して６５質量％以上含有することがより好ましい。一方で、上記０．１５Ｎ以上である短繊維Ａと組合せることで透水性を向上させることができるとの理由から、第１の不織布は、レーヨン繊維を第１の不織布全体に対して９０質量％以下であることがより好ましい。 Next, the first nonwoven fabric preferably contains 60 to 95% by mass of rayon fibers based on the entire first nonwoven fabric. It is more preferable that the first nonwoven fabric contains rayon fibers in an amount of 65% by mass or more based on the entire first nonwoven fabric, since the nonwoven fabric has good diffusibility of liquids such as urine. On the other hand, for the reason that water permeability can be improved by combining with short fibers A having a density of 0.15N or more, the first nonwoven fabric contains 90% rayon fiber by mass relative to the entire first nonwoven fabric. % or less is more preferable.
　（第２の不織布）
　次に、本発明の吸収体に用いられる第２の不織布について詳述する。第２の不織布は、親水性繊維を第２の不織布の全体に対して６０質量％以上含有している。 (Second nonwoven fabric)
Next, the second nonwoven fabric used in the absorbent body of the present invention will be described in detail. The second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric.
　ここで、第２の不織布は、第１の不織布と第３の不織布の中間に配置され、第２の不織布での尿等の液拡散性と透水性を一層両立することで、第１の不織布側の吸水ポリマーにおける吸水量を向上させ、第１の不織布側の吸水ポリマーの活用効率を向上させるとともに、第３の不織布側へ尿等を透水させることで、第３の不織布側の吸水ポリマーを効率的に活用でき、吸収体の吸収特性が優れたものとなる。上記の効果を得ることができるとの観点から、第２の不織布は、親水性繊維を第２の不織布の全体に対して６０質量％以上含有しており、前記親水性繊維は、レーヨン繊維であることが好ましく、第２の不織布の目付量は、２０～５０ｇ／ｍ２であることが好ましい。 Here, the second nonwoven fabric is disposed between the first nonwoven fabric and the third nonwoven fabric, and by making the second nonwoven fabric more compatible with liquid diffusion properties such as urine and water permeability, the second nonwoven fabric By increasing the amount of water absorbed by the water-absorbing polymer on the side and improving the utilization efficiency of the water-absorbing polymer on the first non-woven fabric side, the water-absorbing polymer on the third non-woven fabric side is It can be used efficiently and the absorber has excellent absorption properties. From the viewpoint of being able to obtain the above effects, the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric, and the hydrophilic fibers are rayon fibers. The second nonwoven fabric preferably has a basis weight of 20 to 50 g/m 2 .
　また、第２の不織布は、親水性繊維を第２の不織布の全体に対して６０質量％以上含有している。不織布の尿等の液拡散性や保水性を向上できるとの理由から、第２の不織布は、親水性繊維を第２の不織布の全体に対して８０質量％以上含有していることが好ましく、９５質量％以上であることがより好ましい。親水性繊維としては、綿、麻、レーヨン繊維等のセルロース系繊維を挙げることができる。これらの中でも、尿等の液拡散性に優れる細繊度化が容易で、かつ、取扱い性に優れるとの理由から、第２の不織布に含有される親水性繊維は、レーヨン繊維であることが好ましい。 Further, the second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric. It is preferable that the second nonwoven fabric contains hydrophilic fibers in an amount of 80% by mass or more based on the entire second nonwoven fabric, since the nonwoven fabric can improve the dispersibility of liquids such as urine and water retention. More preferably, it is 95% by mass or more. Examples of hydrophilic fibers include cellulose fibers such as cotton, linen, and rayon fibers. Among these, it is preferable that the hydrophilic fibers contained in the second nonwoven fabric are rayon fibers because they are easy to make finely sized to have excellent dispersibility in liquids such as urine, and are easy to handle. .
　また、第２の不織布は、少なくとも一方の面の三次元算術平均粗さは、５０～３００μｍであることが好ましい。三次元算術平均粗さとは、表面粗さパラメーターを二次元から三次元に拡張したものである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。吸水ポリマーの不織布上への載置ムラを抑制できるとの理由から、第２の不織布の少なくとも一方の面の三次元算術平均粗さは、８０μｍ以上であることがより好ましい。一方で、表面を平滑にすることで面方向への尿等の液拡散性を向上させることができるとの理由から、第２の不織布の少なくとも一方の面の三次元算術平均粗さは、２００μｍ以下であることがより好ましい。また、第２の不織布の少なくとも一方の面の三次元算術平均粗さを上記の範囲とする手段としては、不織布を構成する繊維の種類、不織布の目付量、不織布の種類、不織布化における交絡条件、ウエッブの製法、接着剤の種類、接着剤の使用量を調整すること等が挙げられる。 Furthermore, the second nonwoven fabric preferably has a three-dimensional arithmetic mean roughness of at least one surface of 50 to 300 μm. Three-dimensional arithmetic mean roughness is an extension of the surface roughness parameter from two-dimensional to three-dimensional. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. The three-dimensional arithmetic mean roughness of at least one surface of the second nonwoven fabric is more preferably 80 μm or more because uneven placement of the water-absorbing polymer on the nonwoven fabric can be suppressed. On the other hand, the three-dimensional arithmetic mean roughness of at least one surface of the second nonwoven fabric was set to 200 μm because smoothing the surface can improve the dispersibility of liquids such as urine in the surface direction. It is more preferable that it is below. In addition, the means for making the three-dimensional arithmetic mean roughness of at least one surface of the second nonwoven fabric within the above range include the type of fibers constituting the nonwoven fabric, the basis weight of the nonwoven fabric, the type of nonwoven fabric, and the entanglement conditions in making the nonwoven fabric. , adjusting the web manufacturing method, the type of adhesive, and the amount of adhesive used.
　（第３の不織布）
　本発明の吸収体に用いられる第３の不織布について詳述する。第３の不織布は、第２の不織布を通過した尿等をさらに第３の不織布で拡散させ、第２の吸水ポリマー群での吸収量を向上させる。上記の効果を得ることができるとの観点から、第３の不織布は、レーヨン繊維を第３の不織布全体に対して８０質量％以上含有することが好ましく、９５質量％以上含有することがより好ましい。親水性であるレーヨン繊維の含有量が高くなると、不織布への尿等の液拡散性が良好なものとなる。 (Third nonwoven fabric)
The third nonwoven fabric used in the absorbent body of the present invention will be explained in detail. The third nonwoven fabric further diffuses urine and the like that have passed through the second nonwoven fabric, thereby improving the amount of water absorbed by the second water absorbing polymer group. From the viewpoint of being able to obtain the above effects, the third nonwoven fabric preferably contains rayon fibers in an amount of 80% by mass or more, more preferably 95% by mass or more based on the entire third nonwoven fabric. . When the content of hydrophilic rayon fibers increases, the diffusion of liquids such as urine into the nonwoven fabric becomes better.
　（第１～３の不織布の製造方法）
　次に、本発明の吸収体に用いる第１～３の不織布を製造する方法について具体的に説明するが、本発明の吸収体で用いる第１～３の不織布の製造方法はこれらに限定されるものではない。また、第１～３の不織布の製造方法は、各々異なるものであってもよい。 (First to third nonwoven fabric manufacturing methods)
Next, methods for manufacturing the first to third nonwoven fabrics used in the absorbent body of the present invention will be specifically explained, but the manufacturing methods for the first to third nonwoven fabrics used in the absorbent body of the present invention are limited to these. It's not a thing. Further, the manufacturing methods of the first to third nonwoven fabrics may be different from each other.
　本発明の第１～３の不織布を得るために用いる短繊維をカードマシンに投入し、混繊および開繊維を行った後、ウエーバーで均一なウエッブを成形する。本発明の第１～３の不織布が、スパンレース不織布である場合、続いてウエッブをウォータージェット式の不織布化装置に投入し、高圧水流により交絡させて不織布とする。その後、熱風オーブンで不織布を乾燥させスパンレース不織布を得る。 The short fibers used to obtain the first to third nonwoven fabrics of the present invention are put into a card machine, mixed and opened, and then shaped into a uniform web using a waver. When the first to third nonwoven fabrics of the present invention are spunlace nonwoven fabrics, the webs are then fed into a water jet type nonwoven fabric forming apparatus and entangled with high-pressure water jets to form nonwoven fabrics. Thereafter, the nonwoven fabric is dried in a hot air oven to obtain a spunlace nonwoven fabric.
　また、上記のウエッブは、長方形状である吸収体においては長手方向への尿等の液拡散性を向上させることで吸水ポリマーの利用効率が向上するとの理由から、構成繊維が長手方向に配向したパラレルウエッブ、または、構成繊維が長手方向に配向したパラレルウエッブを含むクリスクロスウエッブであることが好ましい。これらのウエッブから得られる不織布では、構成繊維の長手方向への繊維配向度が高くなる。なお、クリスクロスウエッブは、パラレルウエッブをクロスレイヤー等で短辺方向に配向させたクロスウエッブとパラレルウエッブとを積層してなるものである。 In addition, in the above-mentioned web, the constituent fibers are oriented in the longitudinal direction, because in a rectangular absorbent body, the utilization efficiency of the water-absorbing polymer is improved by improving the dispersibility of liquids such as urine in the longitudinal direction. A parallel web or a criss-cross web including a parallel web in which constituent fibers are oriented in the longitudinal direction is preferred. Nonwoven fabrics obtained from these webs have a high degree of fiber orientation in the longitudinal direction of the constituent fibers. Note that the criss-cross web is formed by laminating a parallel web and a cross web in which the parallel web is oriented in the short side direction using a cross layer or the like.
　（第１および第２の吸水ポリマー群）
　本発明の吸収体は、第１の吸水ポリマー群および第２の吸水ポリマー群（以下、単に「吸水ポリマー群」と称することがある。）を含む。吸水ポリマー群は吸水ポリマーから構成される。 (First and second water-absorbing polymer groups)
The absorbent body of the present invention includes a first water-absorbing polymer group and a second water-absorbing polymer group (hereinafter sometimes simply referred to as a "water-absorbing polymer group"). The water-absorbing polymer group is composed of water-absorbing polymers.
　本発明に用いられる吸水ポリマーとしては、例えば、デンプンや架橋カルボキシメチル化セルロース、アクリル酸又はアクリル酸アルカリ金属塩の重合体又はその共重合体、ポリアクリル酸ナトリウムなどのポリアクリル酸塩やポリアクリル酸塩グラフト重合体等が挙げられる。これらの中でも、生産性の観点から、ポリアクリル酸ナトリウムであることが好ましい。 Examples of water-absorbing polymers used in the present invention include starch, crosslinked carboxymethylated cellulose, polymers of acrylic acid or alkali metal salts of acrylic acid, or copolymers thereof, polyacrylates such as sodium polyacrylate, and polyacrylic acid. Examples include acid salt graft polymers. Among these, sodium polyacrylate is preferred from the viewpoint of productivity.
　また、吸水ポリマーは、製造工程などにおける取り扱い性の観点から粒子状であることが好ましい。吸水ポリマーが粒子状である場合において、その粒子径は、５０～８００μｍであることが好ましい。吸水ポリマーの粒子径は、円形近似を行うことで得られた直径のことである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。ここで、吸水ポリマーの粒子径を５０μｍ以上とすることで、吸水ポリマーが第１～３の不織布それぞれ内部へ浸入し、浸入した吸水ポリマーが尿等を吸収・膨潤した際に、不織布の尿等の液拡散性が阻害されるのを抑制することができる。一方で、吸水ポリマーの粒子径を８００μｍ以下とすることで、吸水ポリマーの吸水能力の低下を抑制することができる。このような粒子径を有する吸水ポリマーの市販品としては、ＳＤＰグローバル製のＮＳ３００（粒子径：２１２－５００μｍ）、住友精化製のＳＡ６０Ｓ（粒子径：２１２－５００μｍ）等が挙げられる。 Furthermore, the water-absorbing polymer is preferably in the form of particles from the viewpoint of ease of handling during the manufacturing process. When the water-absorbing polymer is in the form of particles, the particle size is preferably 50 to 800 μm. The particle size of the water-absorbing polymer is the diameter obtained by circular approximation. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. Here, by setting the particle size of the water-absorbing polymer to 50 μm or more, the water-absorbing polymer penetrates into the inside of each of the first to third nonwoven fabrics, and when the infiltrated water-absorbing polymer absorbs urine, etc. and swells, the nonwoven fabric absorbs urine, etc. It is possible to suppress the liquid diffusivity of the liquid from being inhibited. On the other hand, by setting the particle size of the water-absorbing polymer to 800 μm or less, a decrease in the water-absorbing ability of the water-absorbing polymer can be suppressed. Commercially available water-absorbing polymers having such particle sizes include NS300 (particle size: 212-500 μm) manufactured by SDP Global and SA60S (particle size: 212-500 μm) manufactured by Sumitomo Seika.
　第１および第２の吸水ポリマー群の目付量は、５０～４００ｇ／ｍ２であることが好ましい。吸収体の尿等の吸収量を向上することができるとの理由から、第１および第２の吸水ポリマー群の目付量は、１００ｇ／ｍ２以上であることがより好ましい。一方で、衛生材料製品に用いた場合に通気性が低下したり、尿等を吸収した吸水ポリマーが重みで吸収体から漏れ出したりするのを抑制することができるとの理由から、第１および第２の吸水ポリマー群の目付量は、３００ｇ／ｍ２以下であることがより好ましい。 The basis weight of the first and second water-absorbing polymer groups is preferably 50 to 400 g/m 2 . The basis weight of the first and second water-absorbing polymer groups is more preferably 100 g/m 2 or more, since the amount of urine etc. absorbed by the absorber can be improved. On the other hand, when used in sanitary material products, the first and third methods are effective because they reduce breathability and prevent the water-absorbing polymer that has absorbed urine etc. from leaking out of the absorbent body due to its weight. The basis weight of the second water-absorbing polymer group is more preferably 300 g/m 2 or less.
　また、第１の吸水ポリマー群と第２の吸水ポリマー群との目付量の比率は、２０：８０から４５：５５であることが好ましい。吸水ポリマーが密に存在した状態で尿等と接した際に吸水膨張した吸水ポリマー同士が接触して、他の未吸水・未膨張の吸水ポリマーと水系液体の接触を阻害するゲルブロック現象が起こることが知られているが、第１の吸水ポリマー群と第２の吸水ポリマー群との目付量の比率が上記の範囲であることにより、第２の吸水ポリマー群で吸収された尿等が第１の吸水ポリマー群や第２の不織布へ逆戻りすることを抑制し、ゲルブロック現象を抑制することができ、結果的に吸収体全体の吸収特性を向上させることができる。上記の観点より、第１の吸水ポリマー群と第２の吸水ポリマー群との目付量の比率は、３０：７０から４０：６０であることがさらに好ましい。 Further, the ratio of the basis weight of the first water-absorbing polymer group and the second water-absorbing polymer group is preferably from 20:80 to 45:55. When water-absorbing polymers are densely present and come into contact with urine, etc., the swollen water-absorbing polymers come into contact with each other, causing a gel block phenomenon that inhibits contact between other unabsorbed and unswollen water-absorbing polymers and water-based liquids. However, since the ratio of the basis weight of the first water-absorbing polymer group and the second water-absorbing polymer group is within the above range, the urine etc. absorbed by the second water-absorbing polymer group is absorbed by the second water-absorbing polymer group. It is possible to suppress the return to the first water-absorbing polymer group and the second nonwoven fabric, suppress the gel block phenomenon, and as a result, improve the absorption characteristics of the entire absorbent body. From the above viewpoint, it is more preferable that the ratio of the basis weight of the first water-absorbing polymer group and the second water-absorbing polymer group is from 30:70 to 40:60.
　また、第１の吸水ポリマー群に含まれる吸水ポリマーのゲル通液速度は、５０～３５０ｍｌ／分であることが好ましい。ゲル通液速度とは、荷重下において、生理食塩水によって膨潤ゲル化した吸水ポリマー間を生理食塩水が通過する速度のことである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。第１の吸水ポリマー群における尿等の液拡散性を向上することができ、第２の不織布側への尿等の液送り出し量が向上することができ、また、おむつなどの衛生材料製品に使用した場合の吸収位置を改善することができるとの理由から、第１の吸水ポリマー群に含まれる吸水ポリマーのゲル通液速度は、１００ｍｌ／分以上であることがより好ましい。一方で、第１の吸水ポリマーの吸収が不十分なうちに第１の吸水ポリマー群を含む第１の層から尿等の液漏れが発生するのを抑制することができるとの理由から、第１の吸水ポリマー群に含まれる吸水ポリマーのゲル通液速度は、２５０ｍｌ／分以下であることがより好ましい。 Furthermore, the gel passing rate of the water-absorbing polymer included in the first water-absorbing polymer group is preferably 50 to 350 ml/min. The gel passing rate is the rate at which physiological saline passes between water-absorbing polymers swollen and gelled by physiological saline under load. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. It is possible to improve the dispersibility of liquids such as urine in the first water-absorbing polymer group, and the amount of liquids such as urine sent to the second nonwoven fabric side can be improved. Also, it can be used in sanitary material products such as diapers. It is more preferable that the gel passing rate of the water-absorbing polymer included in the first water-absorbing polymer group is 100 ml/min or more because the absorption position can be improved when the water-absorbing polymer is used. On the other hand, the reason is that it is possible to suppress the leakage of liquid such as urine from the first layer containing the first water-absorbing polymer group while the first water-absorbing polymer is insufficiently absorbed. The gel passing rate of the water-absorbing polymer included in the water-absorbing polymer group 1 is more preferably 250 ml/min or less.
　また、第２の吸水ポリマー群に含まれる吸水ポリマーの飽和吸収量は、２５～７０ｇ／ｇであることが好ましい。飽和吸収量とは、ＪＩＳＫ７２２３（１９９６）に規定されたティーバック法で測定されたものである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。吸収体の吸収特性を向上させることができるとの理由から、第２の吸水ポリマー群に含まれる吸水ポリマーの飽和吸収量は、３０ｇ／ｇ以上であることがより好ましく、３５ｇ／ｇ以上であることがさらに好ましい。一方で、吸収体の形態が保持できなくなって吸水ポリマー自体が吸収体から漏れ出すのを抑制することができるとの理由から、第２の吸水ポリマー群に含まれる吸水ポリマーの飽和吸収量は、６０ｇ／ｇ以下であることがより好ましい。 Furthermore, the saturated absorption amount of the water-absorbing polymer included in the second water-absorbing polymer group is preferably 25 to 70 g/g. The saturated absorption amount is measured by the tea bag method specified in JIS K7223 (1996). More specifically, it refers to what is measured by the method described in the measurement method section of Examples. For the reason that the absorption characteristics of the absorber can be improved, the saturated absorption amount of the water-absorbing polymer included in the second water-absorbing polymer group is more preferably 30 g/g or more, and more preferably 35 g/g or more. It is even more preferable. On the other hand, the saturated absorption amount of the water-absorbing polymers included in the second water-absorbing polymer group is as follows: More preferably, it is 60 g/g or less.
　また、第２の吸水ポリマー群に含まれる吸水ポリマーは、球状の粒子または球状粒子の凝集物を含み、球状の粒子または球状粒子の凝集物を第２の吸水ポリマー群に含まれる吸水ポリマー全体に対して６０質量％以上含有することが好ましい。第３の不織布への尿等の液の送り出しを抑えることができ、第１の吸水ポリマーや第２の吸水ポリマーの吸収が不十分なうちに第３の不織布から尿等の液漏れが発生するのを抑制することができるとの理由から、球状の粒子または球状粒子の凝集物を第２の吸水ポリマー群に含まれる吸水ポリマー全体に対して８０質量％以上含有することがより好ましく、９５質量％以上含有することがさらに好ましい。 Further, the water-absorbing polymer included in the second water-absorbing polymer group includes spherical particles or aggregates of spherical particles, and the spherical particles or aggregates of spherical particles are added to the entire water-absorbing polymer included in the second water-absorbing polymer group. The content is preferably 60% by mass or more. It is possible to suppress liquids such as urine from being sent to the third non-woven fabric, and leakage of liquids such as urine from the third non-woven fabric occurs before the first water-absorbing polymer and the second water-absorbing polymer are insufficiently absorbed. For the reason that it is possible to suppress % or more is more preferable.
　（吸収体）
　本発明の吸収体は、第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布を、この順に備え、かつ、厚さが４．０ｍｍ以下である。また、第１の不織布および第１の吸水ポリマー群が、第１の層を形成しており、第３の不織布および前記第２の吸水ポリマー群が、第２の層を形成している。また、第１の吸水ポリマー群は、第１の不織布に直接的または間接的に固定されており、第２の吸水ポリマー群は、第３の不織布に直接的または間接的に固定されている。さらに、第１の層の液拡散面積は、４０～９０ｃｍ２であり、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値は、１．１～２．０であり、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、１．１～２．５である。 (Absorber)
The absorbent body of the present invention includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order, and has a thickness of 4.0 mm or less. It is. Further, the first nonwoven fabric and the first water-absorbing polymer group form a first layer, and the third non-woven fabric and the second water-absorbing polymer group form a second layer. Further, the first water-absorbing polymer group is directly or indirectly fixed to the first non-woven fabric, and the second water-absorbing polymer group is directly or indirectly fixed to the third non-woven fabric. Furthermore, the liquid diffusion area of the first layer is 40 to 90 cm2 , and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0. The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
　本発明の吸収体は、第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布を、この順に備える。このような構成とすることで、本発明の吸収体をおむつなどの衛生材料製品に用いた場合に、着用者から発せられた尿等が迅速に吸収体の内部に浸透し、吸水ポリマーに迅速に吸収され、保水される。よって、着用時の不快感がなく尿等の液漏れの少ない衛生材料製品とすることができる。 The absorbent body of the present invention includes a first nonwoven fabric, a first water-absorbing polymer group, a second nonwoven fabric, a second water-absorbing polymer group, and a third nonwoven fabric in this order. With this structure, when the absorbent body of the present invention is used in sanitary products such as diapers, urine etc. emitted by the wearer quickly penetrates into the absorbent body and is quickly absorbed into the water-absorbing polymer. is absorbed and retains water. Therefore, it is possible to obtain a sanitary material product that does not cause discomfort when worn and has little leakage of liquids such as urine.
　ここで、本発明の吸収体は、厚さが４．０ｍｍ以下である。吸収体の厚さが４．０ｍｍ以下であることで、本発明の吸収体をおむつなどの衛生材料製品に用いた場合に、本発明の吸収体を用いた衛生材料製品が柔軟となり、ごわつき感が抑制され、さらに、着用感に優れたものとすることができる。衛生材料製品の着用感をより良くするとの理由から、吸収体は薄いほうが好ましく、吸収体の厚さは３ｍｍ以下であることが好ましい。一方で、吸収体の吸収特性をより優れたものとするとの理由から、吸収体の厚さは１ｍｍ以上であることが好ましい。なお、ここで言う吸収体の厚さとはＪＩＳ　Ｌ１９１３（１９９８）　６．１．２　Ａ法に基づいて測定したものをいう。 Here, the absorber of the present invention has a thickness of 4.0 mm or less. Since the thickness of the absorbent body is 4.0 mm or less, when the absorbent body of the present invention is used in sanitary material products such as diapers, the sanitary material product using the absorbent body of the present invention becomes flexible and does not have a stiff feeling. This suppresses the wear and tear, and provides an excellent feeling of wearing. For the reason that the sanitary material product is more comfortable to wear, the absorber is preferably thinner, and the thickness of the absorber is preferably 3 mm or less. On the other hand, the thickness of the absorber is preferably 1 mm or more in order to improve the absorption characteristics of the absorber. In addition, the thickness of the absorber referred to herein refers to the thickness measured based on JIS L1913 (1998) 6.1.2 A method.
　また、本発明の吸収体は、第１の不織布および第１の吸水ポリマー群が、第１の層を形成しており、第３の不織布および前記第２の吸水ポリマー群が、第２の層を形成している。また、第１の吸水ポリマー群は、第１の不織布に直接的または間接的に固定されており、第２の吸水ポリマー群は、第３の不織布に直接的または間接的に固定されている。以下、「第１の不織布および第１の吸水ポリマー群により形成されてなる第１の層」を単に「第１の層」と称することがある。また、以下、「第３の不織布および第２の吸水ポリマー群により形成されてなる第２の層」を単に「第２の層」と称することがある。ここで、本発明の吸収体を衛生材料製品に使用する場合、第１の層側が肌側の使用面となり、第２の層側が肌側使用面の反対の面となる。 Further, in the absorbent body of the present invention, the first nonwoven fabric and the first water-absorbing polymer group form the first layer, and the third non-woven fabric and the second water-absorbing polymer group form the second layer. is formed. Further, the first water-absorbing polymer group is directly or indirectly fixed to the first non-woven fabric, and the second water-absorbing polymer group is directly or indirectly fixed to the third non-woven fabric. Hereinafter, "the first layer formed of the first nonwoven fabric and the first water-absorbing polymer group" may be simply referred to as "the first layer." Further, hereinafter, "the second layer formed of the third nonwoven fabric and the second water-absorbing polymer group" may be simply referred to as "the second layer". Here, when the absorbent body of the present invention is used in a sanitary material product, the first layer side becomes the surface to be used on the skin side, and the second layer side becomes the surface opposite to the surface to be used on the skin side.
　ここで、第１の層の液拡散面積は、４０～９０ｃｍ２である。液拡散面積とは、吸収体の第１の不織布から第３の不織布の垂直方向において第１不織布側の面から他方の面に生理食塩水５ｍｌを通水させた後、第１の不織布から第３の不織布の垂直方向において第１不織布側の面上における生理食塩水の拡散面積のことである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。吸収体において第１の層と接する第２の不織布の尿等の液拡散性を向上することができ、また、第１の層を形成する第１の吸水ポリマーの尿等を吸収する効率を向上することができ、また、第１の層を形成する第１の不織布自体の尿等の吸収量を向上することができ、結果的に吸収体全体の吸収特性を優れたものにできるとの理由から、第１の層の液拡散面積は、４５ｃｍ２以上であることが好ましく、５０ｃｍ２以上であることがより好ましい。一方で、第２の不織布への透水量が低下するのを抑制でき、また、第１の層から尿等の液漏れが発生するのを抑制することができるとの理由から、第１の層の液拡散面積は、８５ｃｍ２以下であることがより好ましく、８０ｃｍ２以下であることがさらに好ましい。また、第１の層の液拡散面積を上記の範囲とする手段としては、第１の不織布を構成する繊維の種類、第１の不織布の目付量、第１の不織布の種類、第１の不織布化における交絡条件、第１のウエッブの製法、第１の吸水ポリマーの種類、第１の吸水ポリマーの粒子径、第１の吸水ポリマー群の目付量、第１の吸水ポリマーのゲル通液速度、接着剤の種類、接着剤の使用量を調整すること等が挙げられる。 Here, the liquid diffusion area of the first layer is 40 to 90 cm 2 . The liquid diffusion area means that after passing 5 ml of physiological saline from the first nonwoven fabric side to the other side in the vertical direction from the first nonwoven fabric to the third nonwoven fabric of the absorber, This refers to the diffusion area of physiological saline on the surface of the nonwoven fabric No. 3 on the first nonwoven fabric side in the vertical direction. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. In the absorber, the second nonwoven fabric in contact with the first layer can improve the diffusivity of liquids such as urine, and also improve the efficiency of absorbing urine and the like of the first water-absorbing polymer forming the first layer. The reason is that it is possible to improve the amount of urine etc. absorbed by the first nonwoven fabric itself forming the first layer, and as a result, the absorption characteristics of the entire absorbent body can be made excellent. Therefore, the liquid diffusion area of the first layer is preferably 45 cm 2 or more, more preferably 50 cm 2 or more. On the other hand, since it is possible to suppress a decrease in the amount of water permeation to the second nonwoven fabric, and also to suppress leakage of liquid such as urine from the first layer, the first layer The liquid diffusion area is more preferably 85 cm 2 or less, and even more preferably 80 cm 2 or less. In addition, as means for setting the liquid diffusion area of the first layer within the above range, the types of fibers constituting the first nonwoven fabric, the basis weight of the first nonwoven fabric, the type of the first nonwoven fabric, the entanglement conditions in the process, manufacturing method of the first web, type of the first water-absorbing polymer, particle diameter of the first water-absorbing polymer, basis weight of the first water-absorbing polymer group, gel passing rate of the first water-absorbing polymer, Examples include adjusting the type of adhesive and the amount of adhesive used.
　次に、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値は、１．１～２．０であり、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、１．１～２．５である。第２の不織布の液拡散面積を第１の層の液拡散面積で除した値を、１．１～２．０とし、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値を、１．１～２．５とすることで、第２の不織布の内部を通って拡散した尿等の液が第１の層や第２の層へ浸入し、第１の層の第１の吸水ポリマーや第２の層の第２の吸水ポリマーの尿等を吸収する効率を向上させることができることや、第２の層の第２の吸水ポリマーでの吸収が不十分なうちに第１の層から尿等の液漏れが発生するのを抑制することができることや、第１の層の第１の吸水ポリマーでの吸収が不十分なうちに第２の層から尿等の液漏れが発生するのを抑制することができること、などを調整することが可能となり、吸収体の吸収特性を優れたものとすることが可能となる。上記の効果を得ることができるとの観点から、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値は、１．２以上であることが好ましく、１．８以下であることが好ましい。また、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、１．４以上であることが好ましく、２．０以下であることが好ましい。さらに、重力により液体は上から下へ流れるため、第２の不織布から第２の層に移行する液体の量は、第２の不織布から第１の層に移行する液体の量よりも大きいものとなる。よって、第１の層の液拡散面積が第２の層の液拡散面積よりも大きいものとすることで、本発明の吸収体の吸収特性はより優れたものとなる。上記の理由により、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値は、１．３以上であることがより好ましく、１．５以下であることがより好ましい。また、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、１．６以上であることがより好ましく、１．８以下であることがより好ましい。また、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値、および、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値を上記の範囲とする手段としては、不織布を構成する繊維の種類、不織布の目付量、不織布の種類、不織布化における交絡条件、ウエッブの製法、吸水ポリマーの種類、吸水ポリマーの粒子径、吸水ポリマー群の目付量、第１の吸水ポリマーのゲル通液速度、第２の吸水ポリマーの飽和吸収量、第２の吸水ポリマーの形状、接着剤の種類、接着剤の使用量を調整すること等が挙げられる。 Next, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0, and the liquid diffusion area of the second nonwoven fabric is divided by the liquid diffusion area of the first layer. The value divided by the liquid diffusion area is 1.1 to 2.5. The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is set to 1.1 to 2.0, and the liquid diffusion area of the second nonwoven fabric is divided by the liquid diffusion area of the second layer. By setting the value divided by 1.1 to 2.5, liquid such as urine that has diffused through the inside of the second nonwoven fabric can infiltrate into the first layer and the second layer, and the first layer It is possible to improve the efficiency of absorbing urine, etc. of the first water-absorbing polymer of the first water-absorbing polymer of the second layer and the second water-absorbing polymer of the second layer, and that it is possible to improve the efficiency of absorbing urine etc. by the second water-absorbing polymer of the second layer. It is possible to prevent liquids such as urine from leaking from the first layer, and to prevent liquids such as urine from leaking from the second layer before the absorption by the first water-absorbing polymer in the first layer is insufficient. It becomes possible to control the occurrence of liquid leakage, etc., and it becomes possible to improve the absorption characteristics of the absorber. From the viewpoint of being able to obtain the above effects, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is preferably 1.2 or more, and 1.8 or less. It is preferable that Further, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is preferably 1.4 or more, and preferably 2.0 or less. Furthermore, since liquid flows from top to bottom due to gravity, the amount of liquid that transfers from the second nonwoven fabric to the second layer is greater than the amount of liquid that transfers from the second nonwoven fabric to the first layer. Become. Therefore, by making the liquid diffusion area of the first layer larger than the liquid diffusion area of the second layer, the absorption characteristics of the absorbent body of the present invention become more excellent. For the above reasons, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is more preferably 1.3 or more, and more preferably 1.5 or less. Further, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is more preferably 1.6 or more, and more preferably 1.8 or less. In addition, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer are calculated as follows. The means for determining the range include the type of fibers constituting the nonwoven fabric, the basis weight of the nonwoven fabric, the type of nonwoven fabric, the entangling conditions for forming the nonwoven fabric, the manufacturing method of the web, the type of water-absorbing polymer, the particle size of the water-absorbing polymer, and the basis weight of the water-absorbing polymer group. Examples include adjusting the gel flow rate of the first water-absorbing polymer, the saturated absorption amount of the second water-absorbing polymer, the shape of the second water-absorbing polymer, the type of adhesive, and the amount of adhesive used.
　また、第１の層および第２の層を形成するために必要とする吸水ポリマー群を不織布に固定する材料としては、ホットメルト接着剤や熱融着性の樹脂パウダーが挙げられる。ホットメルト接着剤としては、衛生材料製品用途に適したスチレン系ホットメルトやオレフィン系ホットメルト接着剤を好適なものとして用いることができる。また、熱融着性の樹脂パウダーとしては、比較的、低温で熱融着を可能とすることができるとの観点から、ポリエチレンパウダーやエチレン－酢酸ビニル共重合体パウダーを好適に用いることができる。吸水ポリマー群を不織布に固定する材料としては、低目付量で固定することができるとの理由から、ホットメルト接着剤がより好ましい。 In addition, examples of the material for fixing the water-absorbing polymer group necessary to form the first layer and the second layer to the nonwoven fabric include hot melt adhesives and heat-fusible resin powders. As the hot melt adhesive, styrene hot melt adhesives or olefin hot melt adhesives suitable for sanitary material products can be suitably used. Further, as the heat-fusible resin powder, polyethylene powder or ethylene-vinyl acetate copolymer powder can be preferably used from the viewpoint that heat-fusion can be performed at a relatively low temperature. . As the material for fixing the water-absorbing polymer group to the nonwoven fabric, a hot melt adhesive is more preferable because it can be fixed with a low basis weight.
　第１の層および第２の層の各層におけるホットメルト接着剤の散布量は、０．５～１０．０ｇ／ｍ２であることが好ましい。不織布上に吸水ポリマーを固定することができるとの理由から、ホットメルト接着剤の散布量は１．０ｇ／ｍ２以上であることがより好ましい。一方で、ホットメルトによる吸水ポリマーの膨張阻害を抑制することができるとの理由から、ホットメルト接着剤の散布量は、４．０ｇ／ｍ２以下であることがより好ましく、３．０ｇ／ｍ２以下であることがさらに好ましく、２．５ｇ／ｍ２以下であることが特に好ましい。 The amount of hot melt adhesive to be sprayed in each layer of the first layer and the second layer is preferably 0.5 to 10.0 g/m 2 . Since the water-absorbing polymer can be fixed on the nonwoven fabric, it is more preferable that the amount of hot melt adhesive to be sprayed is 1.0 g/m 2 or more. On the other hand, the amount of hot melt adhesive to be sprayed is preferably 4.0 g/m 2 or less, and 3.0 g/m It is more preferably 2 or less, particularly preferably 2.5 g/m 2 or less.
　本発明の吸収体は、公知のおむつなどの衛生材料製品に用いられている吸収体と同様に、略長方形のシート状であることが好ましい。 The absorbent body of the present invention is preferably in the form of a substantially rectangular sheet, similar to the absorbent body used in known sanitary material products such as diapers.
　本発明の吸収体の吸収特性は、吸収量が１２５ｇ以上であることが好ましい。本発明における吸収量とは、４５°の傾斜状態で生理食塩水を滴下し、試料の下端側面から生理食塩水が漏れ出すまでに吸収体が吸収した生理食塩水の重量のことである。より詳細には、実施例の測定方法の項に記載の方法で測定されるものをいう。上記の吸収体を衛生材料製品に用いることで、液漏れ防止性に優れたものとなり、着用状態で寝位を取った際など衛生材料製品が傾斜状態になるときの漏れを抑制することができる。上記の観点から、吸収体の吸収量は、１５０ｇ以上であることがより好ましく、１７５ｇ以上であることがさらに好ましい。このような吸収体を得る手段としては、例えば、実施例１等で記載の材料を用い、実施例１で記載の製造方法を採用することを挙げることができる。なお、第１の層の液拡散面積、第２の不織布の液拡散面積、第２の層の液拡散面積、第２の不織布における親水性繊維の含有量からなる群より選ばれる一種以上を適宜調整することで吸収体の吸収量を上記の範囲とすることができる。 Regarding the absorption characteristics of the absorbent body of the present invention, it is preferable that the absorption amount is 125 g or more. The amount of absorption in the present invention refers to the weight of saline absorbed by the absorber until it leaks out from the side surface of the lower end of the sample when saline is dropped at an angle of 45°. More specifically, it refers to what is measured by the method described in the measurement method section of Examples. By using the above-mentioned absorbent material in sanitary material products, it has excellent leakage prevention properties, and can suppress leakage when the sanitary material product is tilted, such as when sleeping while wearing it. . From the above viewpoint, the absorption amount of the absorber is more preferably 150 g or more, and even more preferably 175 g or more. Examples of means for obtaining such an absorbent body include using the materials described in Example 1 and the like and employing the manufacturing method described in Example 1. In addition, one or more types selected from the group consisting of the liquid diffusion area of the first layer, the liquid diffusion area of the second nonwoven fabric, the liquid diffusion area of the second layer, and the content of hydrophilic fibers in the second nonwoven fabric may be selected as appropriate. The absorption amount of the absorber can be adjusted to fall within the above range.
　（吸収体の製造方法）
　本発明の吸収体を製造する方法について具体的に説明するが、本発明の吸収体の製造方法は下記のものに限定されるものではない。 (Manufacturing method of absorber)
The method for manufacturing the absorbent body of the present invention will be specifically explained, but the method for manufacturing the absorbent body of the present invention is not limited to the following method.
　第１の不織布と第２の不織布、および第２の不織布と第３の不織布との間に吸水ポリマー群を固定して吸収体を得る。吸水ポリマー群を固定する方法としては、（１）第３の不織布の一方の面にホットメルト接着剤をスプレー状やスパイラル状に均一に散布する。次に、その上に第２の吸水ポリマーを均一に散布する。次に、その上に第２の不織布の一方の面を圧着する。次に、上記第２の不織布の他方の面（第２の吸水ポリマーを散布していない面）に、第１の吸水ポリマーを均一に散布する。また、第１の不織布の一方の面にホットメルト接着剤をスプレー状やスパイラル状に散布する。そして、上記第２の不織布の他方の面（第１の吸水ポリマーを散布した面）と、上記第１の不織布の一方の面（ホットメルト接着剤を散布した面）とを圧着する方法や、（２）熱融着性の樹脂パウダーと第１の吸水ポリマーを予め均一混合したものを第１の不織布の一方の面に散布した後に、第２の不織布を第１の吸水ポリマー群の上から被せて熱融着性パウダーの融点以上の温度に加熱して熱圧着させ、さらに第２の不織布の他方の面に熱融着性の樹脂パウダーと第２の吸水ポリマーを予め均一混合したものを散布した後に、第３の不織布を第２の吸水ポリマー群の上から被せて熱融着性パウダーの融点以上の温度に加熱して熱圧着させる方法が挙げられる。 An absorbent body is obtained by fixing a water-absorbing polymer group between the first nonwoven fabric and the second nonwoven fabric, and between the second nonwoven fabric and the third nonwoven fabric. As a method for fixing the water-absorbing polymer group, (1) a hot melt adhesive is uniformly spread on one surface of the third nonwoven fabric in a spray form or a spiral form. Next, the second water-absorbing polymer is uniformly sprinkled thereon. Next, one side of the second nonwoven fabric is crimped onto it. Next, the first water-absorbing polymer is uniformly sprayed on the other surface of the second nonwoven fabric (the surface on which the second water-absorbing polymer is not sprayed). Further, a hot melt adhesive is sprayed or spirally distributed on one surface of the first nonwoven fabric. and a method of press-bonding the other surface of the second nonwoven fabric (the surface sprayed with the first water-absorbing polymer) and one surface of the first nonwoven fabric (the surface sprayed with hot melt adhesive); (2) After spraying a homogeneous mixture of heat-fusible resin powder and the first water-absorbing polymer on one side of the first non-woven fabric, the second non-woven fabric is spread over the first water-absorbing polymer group. The second non-woven fabric is covered with a heat-fusible resin powder and a second water-absorbing polymer, which is uniformly mixed in advance. After being spread, a third nonwoven fabric may be placed over the second water-absorbing polymer group, heated to a temperature equal to or higher than the melting point of the heat-fusible powder, and bonded by thermocompression.
　（衛生材料製品の製造方法）
　本発明の吸収体を使用した、紙おむつやナプキン等の衛生材料製品の製造方法について説明する。長方形状に断裁された本発明の吸収体を、この吸収体と同じく長方形状であり、かつ、この吸収体よりも面積の大きい表面シートおよび裏面シートの間に吸収体を挟持して固定する。なお、表面シート側が肌側の使用面となり、裏面シートが肌側の使用面とは逆側の面となる。ここで、吸収体の第１の不織布が表面シートと接するように吸収体を表面シートと裏面シートとで挟持することが好ましい。第１の不織布は、第１の不織布の一方の面から他方の面に水系液体は透過し易くする特徴を有するため、表面シートが第１の不織布と接することにより、表面シート内部に浸透した水系液体は第１の不織布を迅速に透過し、吸水ポリマーに吸水され、保水されやすくなる。よって、吸収体の吸収特性を向上することができるものとなる。表面シートと吸収体、裏面シートと吸収体、および表面シートと裏面シートが、直接接する部分を固定する方法は、ホットメルト接着剤を用いる方法や熱融着性の樹脂パウダーを用いる方法を挙げることができる。 (Method for manufacturing sanitary material products)
A method for manufacturing sanitary material products such as disposable diapers and napkins using the absorbent body of the present invention will be explained. The absorbent body of the present invention cut into a rectangular shape is sandwiched and fixed between a top sheet and a back sheet, which are also rectangular in shape and have a larger area than the absorbent body. Note that the top sheet side is the surface to be used on the skin side, and the back sheet is the surface on the opposite side from the surface to be used on the skin side. Here, it is preferable that the absorbent body is sandwiched between the top sheet and the back sheet so that the first nonwoven fabric of the absorbent body is in contact with the top sheet. The first nonwoven fabric has a feature that allows water-based liquids to easily permeate from one surface of the first nonwoven fabric to the other surface. The liquid quickly passes through the first nonwoven fabric, is absorbed by the water-absorbing polymer, and is easily retained. Therefore, the absorption characteristics of the absorber can be improved. Methods for fixing the parts where the top sheet and the absorber, the back sheet and the absorber, and the top sheet and the back sheet are in direct contact include methods using hot melt adhesives and methods using heat-fusible resin powder. Can be done.
　また、本発明の吸収体を衛生材料製品とする際に用いる表面シートとしては、通液性や触感がより優れたものとなるとの観点から、不織布を採用することが好ましく、例えば、湿式不織布やレジンボンド式乾式不織布、サーマルボンド式乾式不織布、スパンボンド式乾式不織布、ニードルパンチ式乾式不織布、ウォータージェットパンチ式乾式不織布またはフラッシュ紡糸式乾式不織布等のほか、目付量や厚さが均一にできる抄紙法により製造された不織布も好ましく使用できる。中でも、人肌に触れる場所に位置するという観点から、触感に優れるサーマルボンド式乾式不織布を表面シートとして用いることが好ましい。 In addition, it is preferable to use a nonwoven fabric as the surface sheet used when making the absorbent body of the present invention into a sanitary material product, from the viewpoint of better liquid permeability and tactility. For example, a wet nonwoven fabric or In addition to resin bond dry nonwoven fabrics, thermal bond dry nonwoven fabrics, spunbond dry nonwoven fabrics, needle punch dry nonwoven fabrics, water jet punch dry nonwoven fabrics, flash spinning dry nonwoven fabrics, etc., paper making with uniform basis weight and thickness is possible. Nonwoven fabrics produced by this method can also be preferably used. Among these, it is preferable to use a thermal bond type dry nonwoven fabric with excellent feel as the top sheet from the viewpoint of being located in a place that comes into contact with human skin.
　また、本発明の吸収体を衛生材料製品とする際に用いる裏面シートとしては、衛生材料製品内部に蓄積した水蒸気を外部に逃がして着用者に快適性を与えることができるとの観点と、防水性や触感を優れたものとすることができるとの観点とから、透湿防水性フィルムと不織布との積層シートであることが好ましい。上記の透湿防水性フィルムとしては多孔質ポリエチレンフィルム、透湿性ウレタンフィルムや透湿性ポリエステルエラストマーフィルム等が挙げられる。また上記の不織布としては表面シートと同様の不織布を用いることができるが、コストと強度の観点からスパンボンド式乾式不織布が好ましい。 In addition, the back sheet used when the absorbent body of the present invention is used as a sanitary material product is selected from the viewpoints of providing comfort to the wearer by releasing water vapor accumulated inside the sanitary material product to the outside, and waterproofing. A laminated sheet of a moisture-permeable waterproof film and a nonwoven fabric is preferred from the viewpoint of providing excellent properties and texture. Examples of the above-mentioned moisture-permeable waterproof film include porous polyethylene film, moisture-permeable urethane film, and moisture-permeable polyester elastomer film. Further, as the above-mentioned nonwoven fabric, a nonwoven fabric similar to that of the top sheet can be used, but a spunbond type dry nonwoven fabric is preferable from the viewpoint of cost and strength.
　以下、実施例に基づいて本発明を詳細に説明するが、本発明はこれらに限定されるものではない。また、実施例中の性能は次の方法で測定した。 Hereinafter, the present invention will be explained in detail based on Examples, but the present invention is not limited thereto. Moreover, the performance in the examples was measured by the following method.
　［測定方法］
　（１）不織布を構成する繊維の含有量
　ＪＩＳ　Ｌ　１０３０－１（２０１２）「繊維製品の混用率試験方法－第１部：繊維識別」、およびＪＩＳ　Ｌ　１０３０－２（２０１２）「繊維製品の混用率試験方法－第２部：繊維混用率」に基づいて、正量混用率（標準状態における各繊維の質量比）を測定し、これを、不織布を構成する繊維の含有量（質量％）とした。 [Measuring method]
(1) Content of fibers constituting non-woven fabrics JIS L 1030-1 (2012) “Test method for mixing ratio of textile products - Part 1: Fiber identification” and JIS L 1030-2 (2012) “Mixing ratio of textile products” Based on "Fiber Mixing Ratio - Part 2: Fiber Mixing Ratio", measure the correct mixing ratio (mass ratio of each fiber in standard state) and calculate this as the content (mass %) of the fibers constituting the nonwoven fabric. did.
　（２）不織布の目付量   
　ＪＩＳ　Ｌ１９１３（２０１０）　６．２に基づき、試料の単位面積（１ｍ２）当たりの質量（ｇ／ｍ２）を求めた。  (2) Fabric weight of nonwoven fabric
The mass (g/m 2 ) per unit area (1 m 2 ) of the sample was determined based on JIS L1913 (2010) 6.2.
　（３）不織布の三次元算術粗さ
　３Ｄ形状測定機（キーエンス社製、ＶＲ－３２００）を用いて、ＩＳＯ　２５１７８（２０１０）に定められた評価方法により、１０枚の試験片について、それぞれの試験片の一方の面および他方の面の三次元算術平均粗さ（μｍ）を測定した。そして、得られた２０点の測定値の平均値を算出し本発明における三次元算術平均粗さ（μｍ）とした。三次元算術平均粗さ（μｍ）の測定には、１２倍の倍率（低倍率カメラ）で、モードはファインモードとし、フィルターの処理設定は、フィルター種別を「ガウシアン」、Ｓ－フィルターを「なし」、Ｆ－オペレーションを「なし」、Ｌ－フィルターを「なし」、終端効果の補正を「ＯＮ」とした。 (3) Three-dimensional arithmetic roughness of nonwoven fabric Using a 3D shape measuring machine (manufactured by Keyence Corporation, VR-3200), each test was performed on 10 test pieces according to the evaluation method specified in ISO 25178 (2010). The three-dimensional arithmetic mean roughness (μm) of one side and the other side of the piece was measured. Then, the average value of the obtained 20 measurement values was calculated and defined as the three-dimensional arithmetic mean roughness (μm) in the present invention. To measure the three-dimensional arithmetic mean roughness (μm), use 12x magnification (low magnification camera), set the mode to fine mode, and set the filter processing settings to ``Gaussian'' as the filter type and ``None'' as the S-filter. ”, F-operation was set to “None”, L-filter was set to “None”, and end effect correction was set to “ON”.
　（４）短繊維の単繊維強度
　ＪＩＳ　Ｌ１０１５（２０１０）８．７．１に準じて単繊維強度を測定した。具体的には繊維一本を緩く伸ばした状態で繊維の両端をそれぞれ接着剤で紙に貼り付け、紙を貼り付けた部分をつかみ部とした試料を作成した。このときつかみ部分間の繊維のみの領域を２０ｍｍ確保するようにした。この試料のつかみ部分を引張試験器（オリエンテック社製　テンシロン万能試験機　型式ＲＴＧ－１２１０）のつかみに取り付け、つかみ間隔１０ｍｍ、引張速度１０ｍｍ／分の速度で引っ張り、得られた伸び（ｍｍ）－荷重（Ｎ）曲線における最大荷重を単繊維強度（Ｎ）とした。測定は各試料１０本について行いその平均値を算出した。 (4) Single fiber strength of short fiber Single fiber strength was measured according to JIS L1015 (2010) 8.7.1. Specifically, a sample was created in which a single fiber was loosely stretched and both ends of the fiber were attached to paper using an adhesive, and the paper-attached portion was used as a gripping part. At this time, a 20 mm area of only fibers was secured between the gripping parts. The gripping portion of this sample was attached to the grips of a tensile tester (Tensilon Universal Testing Machine Model RTG-1210, manufactured by Orientech Co., Ltd.) and pulled at a gripping interval of 10mm and a tensile speed of 10mm/min.The obtained elongation (mm) - The maximum load in the load (N) curve was defined as the single fiber strength (N). Measurements were performed on 10 samples for each sample, and the average value was calculated.
　（５）吸水ポリマー群の目付量
　標準状態で２４時間以上静置した吸収体の試料（１０ｃｍ×１０ｃｍ）１０点について、各試料の吸水ポリマー群から吸水ポリマーを採取した。次に、それぞれの標準状態における質量（ｇ）を量り、１ｍ２当たりの質量（ｇ／ｍ２）を求め、１０点の平均値を算出し、本発明における吸水ポリマー群の目付量（ｇ／ｍ２）とした。 (5) Fabric weight of water-absorbing polymer group Water-absorbing polymer was collected from the water-absorbing polymer group of each sample of 10 absorbent samples (10 cm x 10 cm) that had been allowed to stand for 24 hours or more under standard conditions. Next, the mass (g) in each standard state was measured, the mass per 1 m 2 (g/m 2 ) was calculated, and the average value of the 10 points was calculated. m2 ).
　（６）吸水ポリマーの飽和吸収量
　ＪＩＳ　Ｋ７２２３（１９９６）に規定されたティーバック法に準じて飽和吸収量を測定した。試験液は生理食塩水（０．９０質量％塩化ナトリウム水溶液）とし、浸漬時間は２４時間とした。測定は各試料を入れたティーバック（５枚）について行い、平均値を算出し、吸水ポリマーの飽和吸収量（ｇ／ｇ）とした。なお、使用する生理食塩水及び測定雰囲気の温度は２５±２℃であった。 (6) Saturated absorption amount of water-absorbing polymer The saturated absorption amount was measured according to the tea bag method specified in JIS K7223 (1996). The test solution was physiological saline (0.90% by mass aqueous sodium chloride solution), and the immersion time was 24 hours. The measurement was performed on tea bags (5 pieces) containing each sample, and the average value was calculated, which was taken as the saturated absorption amount (g/g) of the water-absorbing polymer. Note that the temperature of the physiological saline used and the measurement atmosphere was 25±2°C.
　（７）吸水ポリマーのゲル通液速度
　試料０．０５ｇを１５０ｍｌ生理食塩水（０．９０質量％塩化ナトリウム水溶液）に３０分間浸漬して含水ゲル粒子を調製した。次に、垂直に立てた円筒（内径：２５．４ｍｍ、長さ５６ｃｍ、底部から４０ｍｌの位置及び６０ｍｌの位置に目盛り線有り）の底部に、金網（目開き１０６μｍ）と、開閉自在のコックを閉鎖した状態で、調製した含水ゲル粒子を生理食塩水とともに移した後、この含水ゲル粒子の上に円形金網（目開き１５０μｍ）が金属面に対して垂直に結合する加圧軸（重さ５８．５ｇ、長さ７０ｃｍ）を金網と含水ゲル粒子とが接触するように載せた。次に、加圧軸に錘（５０．５ｇ）を載せ、１分間静置する。続けて、上記コックを開き、濾過円筒管内の液面が６０ｍｌ目盛り線から４０ｍｌ目盛り線になるのに要する時間（Ｔ：秒）を計測し、以下の式により、本発明におけるゲル通液速度（ｍｌ／分）を算出した。なお、使用する生理食塩水及び測定雰囲気の温度は２５±２℃であった。
ゲル通液速度（ｍｌ／分）＝２０ｍｌ×６０／Ｔ秒
　（８）吸水ポリマーの粒子径
　受け皿およびＪＩＳ　Ｚ８８０１に準拠した公称目開き１０６μｍ、２１２μｍ、３００μｍ、４２５μｍ、５００μｍ、１ｍｍ（１０００μｍ）、及び１．４ｍｍのふるいを、下からこの順に重ねて、１．４ｍｍのふるいに吸水ポリマー５．００ｇを置き、自動振とう機（アズワン製水平旋回ふるい　ＳＫＨ－０１）を用いてメモリ設定値３で１０分間振とうし、各ふるいおよび受け皿上での吸水ポリマーの有無と質量を確認した。ただし、各ふるいもしくは受け皿上において、存在が確認できる吸水ポリマーが仕込み量５．００ｇの５％未満である場合には、当該ふるいもしくは受け皿上には吸水ポリマーが無いものとみなす。 (7) Gel passing rate of water-absorbing polymer Hydrogel particles were prepared by immersing 0.05 g of a sample in 150 ml of physiological saline (0.90% by mass aqueous sodium chloride solution) for 30 minutes. Next, a wire mesh (opening 106 μm) and a cock that can be opened and closed were placed on the bottom of a vertical cylinder (inner diameter: 25.4 mm, length 56 cm, with scale lines at 40 ml and 60 ml from the bottom). After the prepared hydrogel particles were transferred together with physiological saline in a closed state, a circular wire mesh (opening 150 μm) was placed on top of the hydrogel particles with a pressure shaft (weighing 58 μm) connected perpendicularly to the metal surface. .5 g, length 70 cm) was placed so that the wire mesh and the hydrous gel particles were in contact with each other. Next, a weight (50.5 g) was placed on the pressure shaft and left standing for 1 minute. Next, open the cock, measure the time (T: seconds) required for the liquid level in the filtration cylindrical tube to go from the 60 ml scale line to the 40 ml scale line, and calculate the gel flow rate (T: seconds) in the present invention using the following formula. ml/min) was calculated. Note that the temperature of the physiological saline used and the measurement atmosphere was 25±2°C.
Gel flow rate (ml/min) = 20 ml x 60/T seconds (8) Particle size of water-absorbing polymer Receiver and nominal opening according to JIS Z8801: 106 μm, 212 μm, 300 μm, 425 μm, 500 μm, 1 mm (1000 μm), Layer 1.4 mm sieves in this order from the bottom, place 5.00 g of water-absorbing polymer on the 1.4 mm sieves, and use an automatic shaker (Horizontal rotating sieve SKH-01 manufactured by As One) at a memory setting of 3. After shaking for 10 minutes, the presence and mass of the water-absorbing polymer on each sieve and saucer were confirmed. However, if the presence of water-absorbing polymer that can be confirmed to exist on each sieve or saucer is less than 5% of the charged amount of 5.00 g, it is assumed that there is no water-absorbing polymer on the sieve or saucer.
　得られた結果から、吸水ポリマーの粒子径の上限値に関しては、吸水ポリマーの存在が仕込み量５．００ｇの５％以上の量で確認されるふるいのうち目開きが一番大きいものについて、そのふるいよりも１段目開きが大きいふるいの目開きを吸水ポリマーの粒子径の上限値とした。例えば、吸水ポリマーをふるいにかけた結果、吸水ポリマーの存在が仕込み量５．００ｇの５％以上の量で確認されるふるいのうち目開きが一番大きいものが４２５μｍの目開きのものである場合は、そのふるいより１段目開きが大きい５００μｍを吸水ポリマーの粒子径の上限値とし、吸水ポリマーの粒子径は５００μｍ以下となる。 From the obtained results, regarding the upper limit of the particle size of the water-absorbing polymer, the presence of the water-absorbing polymer is determined for the sieve with the largest opening among the sieves in which the presence of the water-absorbing polymer is confirmed in an amount of 5% or more of the charged amount of 5.00 g. The opening of the sieve whose first stage opening was larger than that of the sieve was taken as the upper limit of the particle size of the water-absorbing polymer. For example, when the water-absorbing polymer is sieved and the presence of the water-absorbing polymer is confirmed in an amount of 5% or more of the charged amount of 5.00 g, the largest opening of the sieve is 425 μm. The upper limit of the particle size of the water-absorbing polymer is set to 500 μm, which is the first stage opening larger than that of the sieve, and the particle size of the water-absorbing polymer is 500 μm or less.
　また下限値に関しては、吸水ポリマーの存在が仕込み量５．００ｇの５％以上の量で確認されるふるいのうち目開きが一番小さいものについて、そのふるいの目開きを吸水ポリマーの粒子径の下限値とした。なお、吸水ポリマーが目開き１０６μｍの振るいを通過し、受け皿にも仕込み量５．００ｇの５％以上の量で確認された場合には、受け皿を目開き０μｍのふるいと見なした。例えば、吸水ポリマーをふるいにかけた結果、吸水ポリマーの存在が仕込み量５．００ｇの５％以上の量で確認されるふるいのうち目開きが一番小さいものが１０６μｍの目開きのものである場合は、１０６μｍを吸水ポリマーの粒子径の下限値とし、吸水ポリマーの粒子径は１０６μｍを超えるということになる。 In addition, regarding the lower limit value, for the sieve with the smallest opening among the sieves in which the presence of the water-absorbing polymer is confirmed in an amount of 5% or more of the charged amount of 5.00 g, the opening of the sieve is set to the particle size of the water-absorbing polymer. This was taken as the lower limit. In addition, when the water-absorbing polymer passed through a sieve with an opening of 106 μm and was confirmed in the tray in an amount of 5% or more of the charged amount of 5.00 g, the tray was considered to be a sieve with an opening of 0 μm. For example, when the water-absorbing polymer is sieved and the presence of the water-absorbing polymer is confirmed in an amount of 5% or more of the charged amount of 5.00 g, the smallest opening of the sieve is 106 μm. The lower limit of the particle size of the water-absorbing polymer is 106 μm, and the particle size of the water-absorbing polymer exceeds 106 μm.
　（９）液拡散面積
　通液度試験機（Ｌｅｎｚｉｎｇ　Ｉｎｓｔｒｕｍｅｎｔｓ社製、型式：ＬＩＳＴＥＲ　ＡＣ）を用いて、試料５点について、それぞれ液拡散性を測定した。より詳細には、試験機の試料セット位置に、下から濾紙（日本製紙クレシア製、キムタオル４つ折り）、金網（目開き１．５ｍｍ）、試料（１０ｃｍ×１０ｃｍ）の順に置いた。なお、金網に接する試料の面は、本発明における吸収体の第１の層においては第１の不織布側の面であり、第２の不織布においては吸収体としたときに第２の吸水ポリマーが配置される側の面であり、第２の層においては第３の不織布側の面である。次に、生理食塩水５ｍｌ（０．９０質量％塩化ナトリウム水溶液を青色染料で着色したもの）を試験機上部の液投入口へ投入した後、試験を開始した。その後、生理食塩水５ｍｌが試料表面に滴下され、試験機の通液検知プレートおよび通液検知電極によって通液終了が検知された。続けて、通液終了から５秒以内に、試料の生理食塩水によって青色となった部分と定規の目盛りが同じ写真内に納まるように写真を撮影した。写真内の定規の目盛りから相対比較で、上記青色となった部分の面積（ｃｍ２）を算出した。そして、試料５点の面積の平均値を算出し、本発明における液拡散面積（ｃｍ２）とした。なお、使用する生理食塩水及び測定雰囲気の温度は２５±２℃であった。 (9) Liquid Diffusion Area Using a liquid permeability tester (manufactured by Lenzing Instruments, model: LISTER AC), the liquid diffusivity of each of the five samples was measured. More specifically, a filter paper (manufactured by Nippon Paper Crecia Co., Ltd., Kim Towel, folded in four), a wire mesh (mesh opening 1.5 mm), and a sample (10 cm x 10 cm) were placed in this order from the bottom to the sample setting position of the test machine. Note that the surface of the sample in contact with the wire mesh is the surface on the first nonwoven fabric side in the first layer of the absorbent body in the present invention, and the surface on the second nonwoven fabric side when used as the absorbent body in the second nonwoven fabric. This is the surface on the side where the nonwoven fabric is placed, and in the second layer, the surface on the third nonwoven fabric side. Next, after putting 5 ml of physiological saline (0.90% by mass aqueous sodium chloride solution colored with blue dye) into the liquid inlet at the top of the test machine, the test was started. Thereafter, 5 ml of physiological saline was dropped onto the sample surface, and the end of the liquid passage was detected by the liquid passage detection plate and the liquid passage detection electrode of the testing machine. Subsequently, within 5 seconds from the end of the liquid passage, a photograph was taken so that the portion of the sample that turned blue due to the physiological saline and the scale of the ruler were within the same photograph. The area (cm 2 ) of the blue portion was calculated by relative comparison from the scale of the ruler in the photograph. Then, the average value of the areas of the five samples was calculated and defined as the liquid diffusion area (cm 2 ) in the present invention. Note that the temperature of the physiological saline used and the measurement atmosphere was 25±2°C.
　（１０）吸収体の厚さ
　ＪＩＳ　Ｌ１９１３（１９９８）　６．１．２　Ａ法に基づき、厚さ測定器（ＴＥＣＬＯＣＫ社製定圧厚さ測定器、型式：ＰＧ１１Ｊ）を用いて試料の厚さを測定した。測定は各試験片（５枚）について行い、平均値を算出し、吸収体の厚さ（ｍｍ）とした。 (10) Thickness of absorber Based on JIS L1913 (1998) 6.1.2 A method, measure the thickness of the sample using a thickness measuring device (TECLOCK constant pressure thickness measuring device, model: PG11J) did. The measurement was performed on each test piece (5 pieces), and the average value was calculated, which was taken as the thickness (mm) of the absorber.
　（１１）吸収体の吸収量
　４５°の傾斜角度を有したステンレス製の傾斜台上に、裏面シート、吸収体（試料）の順に固定した。なお、試料は長手方向が傾斜方向と一致するように、また、第３の不織布側の面が裏面シートに接するように、また、皺をなくすため伸ばした状態で固定した。ここで、裏面シートには、多孔質ポリエチレンフィルムを用いた。次に、試料の上端１ｃｍ下方の位置で、あらかじめビーカーに準備した生理食塩水（０．９０質量％塩化ナトリウム水溶液を青色染料で着色したもの）を、マイクロチューブポンプから、１．５ｇ／秒の速度で滴下し、試料の下側端面から生理食塩水の漏出が観測されるまで、生理食塩水の滴下を継続した。より詳細には、ビーカーに５００ｇの生理食塩水を準備し、上記傾斜状態で生理食塩水を滴下し、試料の下側端面から生理食塩水の漏出が観測された時点で滴下を終了した。滴下されずにビーカーに残った生理食塩水の重量（ｇ）を測定し、以下の式により吸収体の吸収量を算出した。なお、使用する生理食塩水及び測定雰囲気の温度は２５±２℃であった。
吸収体の吸収量（ｇ）＝５００ｇ－Ｑ
Ｑ（ｇ）：滴下されずにビーカーに残った生理食塩水の量
なお、吸収量は高い値を示すほど、液漏れ防止性に優れている。 (11) Absorption amount of absorber The back sheet and the absorber (sample) were fixed in this order on a stainless steel inclined table having an inclination angle of 45°. Note that the sample was fixed in a stretched state so that the longitudinal direction coincided with the inclination direction, and so that the surface on the third nonwoven fabric side was in contact with the back sheet, and in order to eliminate wrinkles. Here, a porous polyethylene film was used for the back sheet. Next, at a position 1 cm below the upper edge of the sample, physiological saline (0.90 mass% sodium chloride aqueous solution colored with blue dye) prepared in advance in a beaker was pumped from a microtube pump at a rate of 1.5 g/sec. Dropping of the saline was continued at a speed until leakage of saline was observed from the lower end surface of the sample. More specifically, 500 g of physiological saline was prepared in a beaker, and the physiological saline was dropped in the above-mentioned inclined state, and the dropping was stopped when leakage of the physiological saline was observed from the lower end face of the sample. The weight (g) of the physiological saline remaining in the beaker without being dropped was measured, and the amount absorbed by the absorber was calculated using the following formula. Note that the temperature of the physiological saline used and the measurement atmosphere was 25±2°C.
Absorption amount of absorber (g) = 500g - Q
Q(g): Amount of physiological saline remaining in the beaker without being dropped. The higher the absorbed amount, the better the leakage prevention property.
　（１２）総合評価
　得られた吸収体の総合評価を以下の基準で実施した。
Ａ：吸収量が１５０ｇ以上であり、厚さが４．０ｍｍ以下であるもの。
Ｂ：吸収量が１２５ｇ以上であり、厚さが４．０ｍｍ以下であるもの。
Ｃ：吸収量が１２５ｇ未満、厚さが４．０ｍｍを超える、の少なくともどちらか一方を満たすもの。 (12) Comprehensive evaluation Comprehensive evaluation of the obtained absorbent body was performed based on the following criteria.
A: Absorption amount is 150g or more and thickness is 4.0mm or less.
B: Absorption amount is 125 g or more and thickness is 4.0 mm or less.
C: Absorption amount is less than 125 g and thickness is more than 4.0 mm.
　［実施例１］
　（第１の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量２０ｇ／ｍ２のパラレルウエッブとした。また上記のレーヨンからなる短繊維７０質量％と、ポリエチレンテレフタレートからなる中空短繊維（繊維径：３０μｍ、繊維長：５１ｍｍ、単繊維強度：０．３０Ｎ、以降「短繊維Ａ」と称することがある）３０質量％をカードで混繊し、開繊した後、ウエーバーで目付量２０ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて（クリスクロスウエッブ）、クロスウエッブ側から高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量４０ｇ／ｍ２のスパンレース不織布となる第１の不織布ａを得た。なお、第１の不織布ａに含まれる短繊維Ａの割合は、第１の不織布ａの全体に対し１５質量％であった。また、第１の不織布ａに含まれるレーヨンからなる短繊維の割合は、第１の不織布ａの全体に対し８５質量％であった。 [Example 1]
(First nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 20 g/m 2 using a waver. . In addition, 70% by mass of short fibers made of the above rayon and hollow short fibers made of polyethylene terephthalate (fiber diameter: 30 μm, fiber length: 51 mm, single fiber strength: 0.30 N, hereinafter sometimes referred to as "short fiber A") ) 30% by mass was mixed with a card, opened, and then made into a cross web with a basis weight of 20 g/m 2 using a Weber. The obtained parallel web and cross web are overlapped (cris cross web), and a high pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 40 g/ m2 . A first nonwoven fabric a was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric a was 15% by mass with respect to the entire first nonwoven fabric a. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric a was 85% by mass with respect to the entire first nonwoven fabric a.
　（第２の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量１５ｇ／ｍ２のパラレルウエッブと目付量１５ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて、高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量３０ｇ／ｍ２のスパンレース不織布となる第２の不織布ａを得た。 (Second nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a fabric weight of 15 g/m 2 using a Weber. A cross web with an amount of 15 g/m 2 was prepared. The obtained parallel web and cross web were overlapped, entangled by applying a high-pressure water stream, and dried at 150°C for 3 minutes to obtain a second nonwoven fabric a, which becomes a spunlace nonwoven fabric with a basis weight of 30 g/m 2 . .
　（第３の不織布）
　第２の不織布と同じものを用いた。 (Third nonwoven fabric)
The same nonwoven fabric as the second nonwoven fabric was used.
　（吸収体）
　第１の不織布のパラレルウエッブ側を第１の面として、第１の面にスチレン系ホットメルトを２ｇ／ｍ２となるようにスプレー状に散布し、その上に第１の吸水ポリマー（ＳＤＰグローバル製ＮＳ３００）を目付量１００ｇ／ｍ２となるように均一に散布した。次に、その上に第２の不織布の一方の面を被せて圧着した。次に、第３の不織布の一方の面にスチレン系ホットメルトを２ｇ／ｍ２となるようにスプレー状に散布し、その上に第２の吸水ポリマー（住友精化製ＳＡ６０Ｓ）を目付量１５０ｇ／ｍ２となるように均一に散布した。次に、第２の不織布の他方の面（第１の吸水ポリマー散布面とは反対の面）が第３の不織布上に散布した第２吸水ポリマーと接するように被せて圧着した。ここで、第１の吸水ポリマー群は、第１の不織布に直接的または間接的に固定されている。また、第２の吸水ポリマー群は、第３の不織布に直接的または間接的に固定されている。得られたものを長辺２０ｃｍ×短辺１０ｃｍの長方形状にカットすることで長方形状の吸収体を得た。この吸収体の構成および性能を表１に示す。この吸収体の厚さは２．０ｍｍであり、吸収量は１７５ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
With the parallel web side of the first nonwoven fabric as the first surface, styrene hot melt is sprayed onto the first surface at a concentration of 2 g/ m2 , and the first water absorbing polymer (SDP Global NS300) was uniformly sprinkled to give a basis weight of 100 g/m 2 . Next, one side of the second nonwoven fabric was placed thereon and crimped. Next, styrene-based hot melt was sprayed on one side of the third nonwoven fabric at a rate of 2 g/m 2 , and a second water-absorbing polymer (SA60S manufactured by Sumitomo Seika Chemical Co., Ltd.) was applied thereon with a basis weight of 150 g. / m2 . Next, the other surface of the second nonwoven fabric (the surface opposite to the surface on which the first water-absorbing polymer was sprayed) was placed on the third non-woven fabric so that it was in contact with the second water-absorbing polymer that had been sprayed, and the third non-woven fabric was crimped. Here, the first water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric. Further, the second water-absorbing polymer group is directly or indirectly fixed to the third nonwoven fabric. The obtained product was cut into a rectangular shape with a long side of 20 cm and a short side of 10 cm to obtain a rectangular absorbent body. Table 1 shows the structure and performance of this absorber. The thickness of this absorber was 2.0 mm, the absorption amount was 175 g, and it was thin and had excellent absorption characteristics.
　［実施例２］
　（第１の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量１０ｇ／ｍ２のパラレルウエッブとした。また上記のレーヨンからなる短繊維４０質量％と、短繊維Ａからなる短繊維６０質量％をカードで混繊し、開繊した後、ウエーバーで目付量１０ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて（クリスクロスウエッブ）、クロスウエッブ側から高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量２０ｇ／ｍ２のスパンレース不織布となる第１の不織布ｂを得た。なお、第１の不織布ｂに含まれる短繊維Ａの割合は、第１の不織布ｂの全体に対し３０質量％であった。また、第１の不織布ｂに含まれるレーヨンからなる短繊維の割合は、第１の不織布ｂの全体に対し７０質量％であった。 [Example 2]
(First nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 10 g/m 2 using a waver. . In addition, 40% by mass of the above-mentioned short fibers made of rayon and 60% by mass of short fibers made of short fiber A were mixed with a card, opened, and then made into a cross web with a basis weight of 10 g/m 2 using a waver. The obtained parallel web and cross web are overlapped (cris cross web), and a high-pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 20 g/ m2 . A first nonwoven fabric b was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric b was 30% by mass with respect to the entire first nonwoven fabric b. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric b was 70% by mass with respect to the entire first nonwoven fabric b.
　（吸収体）
　第１の不織布を第１の不織布ｂに変更し、第１の吸水ポリマーの目付量を１２５ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表１に示す。この吸収体の厚さは１．９ｍｍであり、吸収量は１６０ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
An absorbent body was obtained in the same manner as in Example 1, except that the first nonwoven fabric was changed to the first nonwoven fabric b, and the basis weight of the first water-absorbing polymer was changed to 125 g/m 2 . Table 1 shows the structure and performance of this absorber. The thickness of this absorber was 1.9 mm, the absorption amount was 160 g, and it was thin and had excellent absorption characteristics.
　［実施例３］
　（第１の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量２５ｇ／ｍ２のパラレルウエッブとした。また上記のレーヨンからなる短繊維８０質量％と、短繊維Ａからなる短繊維２０質量％をカードで混繊し、開繊した後、ウエーバーで目付量２５ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて（クリスクロスウエッブ）、クロスウエッブ側から高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量５０ｇ／ｍ２のスパンレース不織布となる第１の不織布ｃを得た。なお、第１の不織布ｃに含まれる短繊維Ａの割合は、第１の不織布ｃの全体に対し１０質量％であった。また、第１の不織布ｃに含まれるレーヨンからなる短繊維の割合は、第１の不織布ｃの全体に対し９０質量％であった。 [Example 3]
(First nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 25 g/m 2 using a waver. . In addition, 80% by mass of the above-mentioned short fibers made of rayon and 20% by mass of short fibers made of short fiber A were mixed with a card, opened, and then made into a cross web with a basis weight of 25 g/m 2 using a waver. The obtained parallel web and cross web are overlapped (cris cross web), and a high-pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 50 g/ m2 . A first nonwoven fabric c was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric c was 10% by mass with respect to the entire first nonwoven fabric c. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric c was 90% by mass with respect to the entire first nonwoven fabric c.
　（第２の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量２２．５ｇ／ｍ２のパラレルウエッブと目付量２２．５ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて、高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量４５ｇ／ｍ２のスパンレース不織布となる第２の不織布ｃを得た。 (Second nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 22.5 g/m 2 using a waver. A cross web with a basis weight of 22.5 g/m 2 was prepared. The obtained parallel web and cross web were overlapped, entangled by applying a high-pressure water stream, and dried at 150°C for 3 minutes to obtain a second nonwoven fabric c, which becomes a spunlace nonwoven fabric with a basis weight of 45 g/m 2 . .
　（吸収体）
　第１の不織布を第１の不織布ｃに変更し、第２の不織布を第２の不織布ｃに変更し、第１の吸水ポリマーの目付量を７５ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表１に示す。この吸収体の厚さは２．２ｍｍであり、吸収量は１５０ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
Example 1 except that the first nonwoven fabric was changed to the first nonwoven fabric c, the second nonwoven fabric was changed to the second nonwoven fabric c, and the basis weight of the first water absorbing polymer was changed to 75 g/m 2 An absorber was obtained in the same manner. Table 1 shows the structure and performance of this absorber. The thickness of this absorbent body was 2.2 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
　［実施例４］
　（第３の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量２５ｇ／ｍ２のパラレルウエッブと目付量２５ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて、高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量５０ｇ／ｍ２のスパンレース不織布となる第３の不織布ｄを得た。 [Example 4]
(Third nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a fabric weight of 25 g/m 2 using a Weber. A cross web with an amount of 25 g/m 2 was prepared. The obtained parallel web and cross web were overlapped, entangled by applying a high-pressure water stream, and dried at 150°C for 3 minutes to obtain a third nonwoven fabric d, which becomes a spunlace nonwoven fabric with a basis weight of 50 g/m 2 . .
　（吸収体）
　第３の不織布を第３の不織布ｄに変更し、第２の吸水ポリマーをＳＤＰグローバル製ＮＳ３００に変更し、第２の吸水ポリマーの目付量を１２５ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表１に示す。この吸収体の厚さは２．１ｍｍであり、吸収量は１５０ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
Example 1 except that the third non-woven fabric was changed to third non-woven fabric d, the second water-absorbing polymer was changed to NS300 manufactured by SDP Global, and the basis weight of the second water-absorbing polymer was changed to 125 g/ m2 . An absorber was obtained in the same manner. Table 1 shows the structure and performance of this absorber. The thickness of this absorber was 2.1 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
　［実施例５］
　（第３の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）７０質量％と、短繊維Ａからなる短繊維３０質量％をカードで混繊し、開繊した後、ウエーバーで目付量１０ｇ／ｍ２のパラレルウエッブと目付量１０ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて、高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量２０ｇ／ｍ２のスパンレース不織布となる第３の不織布ｅを得た。 [Example 5]
(Third nonwoven fabric)
After mixing 70% by mass of short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51mm, single fiber strength: 0.04N) and 30% by mass of short fibers made of short fiber A with a card, and opening the fibers. A parallel web with a basis weight of 10 g/m 2 and a cross web with a basis weight of 10 g/m 2 were prepared using Weber. The obtained parallel web and cross web were layered, entangled by applying a high-pressure water stream, and dried at 150°C for 3 minutes to obtain a third nonwoven fabric e, which becomes a spunlace nonwoven fabric with a basis weight of 20 g/m 2 . .
　（吸収体）
　第３の不織布を第３の不織布ｅに変更し、第２の吸水ポリマーの目付量を１７５ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表１に示す。この吸収体の厚さは２．０ｍｍであり、吸収量は１６０ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
An absorbent body was obtained in the same manner as in Example 1, except that the third nonwoven fabric was changed to third nonwoven fabric e, and the basis weight of the second water-absorbing polymer was changed to 175 g/m 2 . Table 1 shows the structure and performance of this absorber. The thickness of this absorbent body was 2.0 mm, the absorption amount was 160 g, and it was thin and had excellent absorption characteristics.
　［実施例６］
　第２の不織布の目付量を２０ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表２に示す。この吸収体の厚さは１．９ｍｍであり、吸収量は１５０ｇであり、薄型で吸収特性に優れるものであった。 [Example 6]
An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 20 g/m 2 . Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 1.9 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
　［実施例７］
　第２の不織布の目付量を５０ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表２に示す。この吸収体の厚さは２．２ｍｍであり、吸収量は１６０ｇであり、薄型で吸収特性に優れるものであった。 [Example 7]
An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 50 g/m 2 . Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 2.2 mm, the absorption amount was 160 g, and it was thin and had excellent absorption characteristics.
　［実施例８］
　第２の不織布の目付量を１５ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表２に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は１４０ｇであり、薄型で吸収特性に優れるものであった。 [Example 8]
An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 15 g/m 2 . Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 140 g, and it was thin and had excellent absorption characteristics.
　［実施例９］
　第２の不織布の目付量を６０ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表２に示す。この吸収体の厚さは２．３ｍｍであり、吸収量は１４５ｇであり、薄型で吸収特性に優れるものであった。 [Example 9]
An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the second nonwoven fabric was changed to 60 g/m 2 . Table 2 shows the structure and performance of this absorber. The thickness of this absorber was 2.3 mm, the absorption amount was 145 g, and it was thin and had excellent absorption characteristics.
　［実施例１０］
　第１の不織布に含まれる短繊維Ａの割合を第１の不織布の全体に対し５質量％に変更し、第１の不織布に含まれるレーヨンからなる短繊維の割合を第１の不織布の全体に対し９５質量％に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表２に示す。この吸収体の厚さは１．９ｍｍであり、吸収量は１６５ｇであり、薄型で吸収特性に優れるものであった。 [Example 10]
The proportion of short fibers A contained in the first nonwoven fabric is changed to 5% by mass with respect to the whole of the first nonwoven fabric, and the proportion of short fibers made of rayon contained in the first nonwoven fabric is changed to 5% by mass with respect to the whole of the first nonwoven fabric. An absorber was obtained in the same manner as in Example 1 except that the content was changed to 95% by mass. Table 2 shows the structure and performance of this absorber. The thickness of this absorbent body was 1.9 mm, the absorption amount was 165 g, and it was thin and had excellent absorption characteristics.
　［実施例１１］
　第１の不織布に含まれる短繊維Ａの割合を第１の不織布の全体に対し４０質量％に変更し、第１の不織布に含まれるレーヨンからなる短繊維の割合を第１の不織布の全体に対し６０質量％に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表２に示す。この吸収体の厚さは２．２ｍｍであり、吸収量は１５０ｇであり、薄型で吸収特性に優れるものであった。 [Example 11]
The proportion of short fibers A contained in the first nonwoven fabric is changed to 40% by mass with respect to the whole of the first nonwoven fabric, and the proportion of short fibers made of rayon contained in the first nonwoven fabric is changed to 40% by mass with respect to the whole of the first nonwoven fabric. An absorber was obtained in the same manner as in Example 1 except that the amount was changed to 60% by mass. Table 2 shows the structure and performance of this absorber. The thickness of this absorbent body was 2.2 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
　［実施例１２］
　第１の不織布に含まれるレーヨンからなる短繊維の割合を第１の不織布の全体に対し１００質量％（短繊維Ａを含まない）に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表３に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は１３５ｇであり、薄型で吸収特性に優れるものであった。 [Example 12]
An absorber was prepared in the same manner as in Example 1, except that the proportion of short fibers made of rayon contained in the first nonwoven fabric was changed to 100% by mass (not including short fibers A) based on the entire first nonwoven fabric. Obtained. Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
　［実施例１３］
　第１の不織布に含まれる短繊維Ａの割合を第１の不織布の全体に対し５０質量％に変更し、第１の不織布に含まれるレーヨンからなる短繊維の割合を第１の不織布の全体に対し５０質量％に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表３に示す。この吸収体の厚さは２．４ｍｍであり、吸収量は１３５ｇであり、薄型で吸収特性に優れるものであった。 [Example 13]
The proportion of short fibers A contained in the first nonwoven fabric is changed to 50% by mass with respect to the whole of the first nonwoven fabric, and the proportion of short fibers made of rayon contained in the first nonwoven fabric is changed to 50% by mass with respect to the whole of the first nonwoven fabric. An absorber was obtained in the same manner as in Example 1 except that the amount was changed to 50% by mass. Table 3 shows the structure and performance of this absorber. The thickness of this absorbent body was 2.4 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
　［実施例１４］
　第１の吸水ポリマーの目付量を５０ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表３に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は１５０ｇであり、薄型で吸収特性に優れるものであった。 [Example 14]
An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the first water-absorbing polymer was changed to 50 g/m 2 . Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 150 g, and it was thin and had excellent absorption characteristics.
　［実施例１５］
　第１の吸水ポリマーの目付量を２５ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表３に示す。この吸収体の厚さは１．７ｍｍであり、吸収量は１３５ｇであり、薄型で吸収特性に優れるものであった。 [Example 15]
An absorbent body was obtained in the same manner as in Example 1 except that the basis weight of the first water-absorbing polymer was changed to 25 g/m 2 . Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.7 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
　［実施例１６］
　（第１の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量１５ｇ／ｍ２のパラレルウエッブとした。また上記のレーヨンからなる短繊維４０質量％と、短繊維Ａからなる短繊維６０質量％をカードで混繊し、開繊した後、ウエーバーで目付量１５ｇ／ｍ２のクロスウエッブとした。得られたパラレルウエッブとクロスウエッブを重ねて（クリスクロスウエッブ）、クロスウエッブ側から高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量３０ｇ／ｍ２のスパンレース不織布となる第１の不織布ｐを得た。なお、第１の不織布ｐに含まれる短繊維Ａの割合は、第１の不織布ｐの全体に対し３０質量％であった。また、第１の不織布ｐに含まれるレーヨンからなる短繊維の割合は、第１の不織布ｐの全体に対し７０質量％であった。 [Example 16]
(First nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 15 g/m 2 using a waver. . In addition, 40% by mass of the above-mentioned short fibers made of rayon and 60% by mass of short fibers made of short fiber A were mixed with a card, opened, and then made into a cross web with a basis weight of 15 g/m 2 using a waver. The obtained parallel web and cross web are layered (cris cross web), and a high-pressure water stream is applied from the cross web side to entangle them, and then dried at 150°C for 3 minutes to form a spunlace nonwoven fabric with a basis weight of 30 g/ m2 . A first nonwoven fabric p was obtained. Note that the proportion of short fibers A contained in the first nonwoven fabric p was 30% by mass with respect to the entire first nonwoven fabric p. Further, the proportion of short fibers made of rayon contained in the first nonwoven fabric p was 70% by mass with respect to the entire first nonwoven fabric p.
　（吸収体）
　第１の不織布を第１の不織布ｐに変更した以外は、実施例６と同様にして吸収体を得た。この吸収体の構成および性能を表３に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は１３５ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
An absorbent body was obtained in the same manner as in Example 6 except that the first nonwoven fabric was changed to the first nonwoven fabric p. Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 1.8 mm, the absorption amount was 135 g, and it was thin and had excellent absorption characteristics.
　［実施例１７］
　第１の不織布を第１の不織布ｐに変更した以外は、実施例７と同様にして吸収体を得た。この吸収体の構成および性能を表３に示す。この吸収体の厚さは２．１ｍｍであり、吸収量は１４５ｇであり、薄型で吸収特性に優れるものであった。 [Example 17]
An absorbent body was obtained in the same manner as in Example 7 except that the first nonwoven fabric was changed to the first nonwoven fabric p. Table 3 shows the structure and performance of this absorber. The thickness of this absorber was 2.1 mm, the absorption amount was 145 g, and it was thin and had excellent absorption characteristics.
　［比較例１］
　第２の不織布をエアスルー不織布（ポリプロピレン製、目付量５０ｇ／ｍ２、厚さ４．０ｍｍ）に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表４に示す。この吸収体の厚さは５．０ｍｍであり、吸収量は９５ｇであり、嵩高（厚く）で、吸収特性に劣るものであった。 [Comparative example 1]
An absorbent body was obtained in the same manner as in Example 1, except that the second nonwoven fabric was changed to an air-through nonwoven fabric (made of polypropylene, basis weight 50 g/m 2 , thickness 4.0 mm). Table 4 shows the structure and performance of this absorber. The thickness of this absorbent body was 5.0 mm, the absorption amount was 95 g, and it was bulky (thick) and had poor absorption characteristics.
　［比較例２］
　第２の不織布をスパンボンド不織布（ポリプロピレン製、目付量１０ｇ／ｍ２）に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表４に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は１１０ｇであり、薄型ではあるが、吸収特性に劣るものであった。 [Comparative example 2]
An absorbent body was obtained in the same manner as in Example 1, except that the second nonwoven fabric was changed to a spunbond nonwoven fabric (made of polypropylene, basis weight: 10 g/m 2 ). Table 4 shows the structure and performance of this absorber. The thickness of this absorbent body was 1.8 mm, and the absorption amount was 110 g. Although it was thin, it had poor absorption characteristics.
　［比較例３］
　第１の不織布をスパンボンド不織布（ポリプロピレン製、目付量１０ｇ／ｍ２）に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表４に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は６０ｇであり、薄型ではあるが吸収特性に劣るものであった。 [Comparative example 3]
An absorbent body was obtained in the same manner as in Example 1, except that the first nonwoven fabric was changed to a spunbond nonwoven fabric (made of polypropylene, basis weight 10 g/m 2 ). Table 4 shows the structure and performance of this absorber. This absorbent body had a thickness of 1.8 mm and an absorption amount of 60 g, and although it was thin, its absorption characteristics were poor.
　［比較例４］
　（第１の不織布）
　第１の不織布ｃをカレンダー加工（シリンダー圧力：４ｋｇｆ／ｃｍ２、ローラー温度：２０℃、速度：１ｍ／分）させた第１の不織布ｃａを得た。 [Comparative example 4]
(First nonwoven fabric)
A first nonwoven fabric ca was obtained by calendering the first nonwoven fabric c (cylinder pressure: 4 kgf/cm 2 , roller temperature: 20° C., speed: 1 m/min).
　（吸収体）
　第１の不織布を第１の不織布ｃａに変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表４に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は５０ｇであり、薄型ではあるが吸収特性に劣るものであった。 (Absorber)
An absorbent body was obtained in the same manner as in Example 1 except that the first nonwoven fabric was changed to the first nonwoven fabric ca. Table 4 shows the structure and performance of this absorber. The thickness of this absorbent body was 1.8 mm, and the absorption amount was 50 g. Although it was thin, it had poor absorption characteristics.
　［比較例５］
　第３の不織布をスパンボンド不織布（ポリプロピレン製、目付量１０ｇ／ｍ２）に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表４に示す。この吸収体の厚さは１．８ｍｍであり、吸収量は８０ｇであり、薄型ではあるが吸収特性に劣るものであった。 [Comparative example 5]
An absorbent body was obtained in the same manner as in Example 1, except that the third nonwoven fabric was changed to a spunbond nonwoven fabric (made of polypropylene, basis weight 10 g/m 2 ). Table 4 shows the structure and performance of this absorber. The thickness of this absorbent body was 1.8 mm, and the absorption amount was 80 g, and although it was thin, it had poor absorption characteristics.
　［実施例１８］
　第１の不織布および第３の不織布へのホットメルト散布量をそれぞれ４ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表５に示す。この吸収体の厚さは１．９ｍｍであり、吸収量は１６０ｇであり、薄型で吸収特性に優れるものであった。 [Example 18]
An absorbent body was obtained in the same manner as in Example 1, except that the amount of hot melt sprayed on the first nonwoven fabric and the third nonwoven fabric was changed to 4 g/m 2 . Table 5 shows the structure and performance of this absorber. The thickness of this absorber was 1.9 mm, the absorption amount was 160 g, and it was thin and had excellent absorption characteristics.
　［実施例１９］
　第１の不織布および第３の不織布へのホットメルト散布量をそれぞれ１０ｇ／ｍ２に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表５に示す。この吸収体の厚さは１．７ｍｍであり、吸収量は１３０ｇであり、薄型で吸収特性に優れるものであった。 [Example 19]
An absorbent body was obtained in the same manner as in Example 1, except that the amount of hot melt sprayed on the first nonwoven fabric and the third nonwoven fabric was changed to 10 g/m 2 . Table 5 shows the structure and performance of this absorber. The thickness of this absorber was 1.7 mm, the absorption amount was 130 g, and it was thin and had excellent absorption characteristics.
　［実施例２０］
　（第２の不織布）
　レーヨンからなる短繊維（繊維径：１３μｍ、繊維長：５１ｍｍ、単繊維強度：０．０４Ｎ）からなる短繊維を、カードで開繊した後、ウエーバーで目付量３０ｇ／ｍ２のパラレルウエッブとした。得られたパラレルウエッブに高圧水流をあてて絡合させ、１５０℃で３分間乾燥することにより目付量３０ｇ／ｍ２のスパンレース不織布となる第２の不織布ｆを得た。 [Example 20]
(Second nonwoven fabric)
Short fibers made of rayon (fiber diameter: 13 μm, fiber length: 51 mm, single fiber strength: 0.04 N) were opened with a card, and then made into a parallel web with a basis weight of 30 g/m 2 using a waver. . The obtained parallel web was entangled with a high-pressure water stream and dried at 150° C. for 3 minutes to obtain a second nonwoven fabric f, which is a spunlace nonwoven fabric with a basis weight of 30 g/m 2 .
　（吸収体）
　第２の不織布及び第３の不織布をそれぞれ第２の不織布ｆに変更し、第２の吸水ポリマーをＳＤＰグローバル製ＮＳ３００に変更した以外は、実施例１と同様にして吸収体を得た。この吸収体の構成および性能を表５に示す。この吸収体の厚さは２．１ｍｍであり、吸収量は１６５ｇであり、薄型で吸収特性に優れるものであった。 (Absorber)
An absorbent body was obtained in the same manner as in Example 1, except that the second nonwoven fabric and the third nonwoven fabric were each changed to the second nonwoven fabric f, and the second water-absorbing polymer was changed to NS300 manufactured by SDP Global. Table 5 shows the structure and performance of this absorber. The thickness of this absorber was 2.1 mm, the absorption amount was 165 g, and it was thin and had excellent absorption characteristics.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
　ここで、実施例１～２０の吸収体と比較例１～２の吸収体とを対比した。実施例１～２０の吸収体は第２の不織布が親水性繊維のみから構成されるものであったのに対し、比較例１～２の吸収体は第２の不織布が疎水性繊維のみから構成されるものであった。また、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値および、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値に着目すると、比較例１～２の吸収体は第２の不織布の液拡散性が第１の層および第２の層の液拡散性より劣るものであったのに対し、実施例１～２０の吸収体は第２の不織布の液拡散性が第１の層および第２の層の液拡散性より優れるものであった。このことにより、実施例１～２０の吸収体の吸収特性は、比較例１～２の吸収特性よりも優れていた。さらに、吸収体の厚さは、比較例１の吸収体と比べ実施例１～２０の吸収体の方が大幅に薄いといえる。 Here, the absorbers of Examples 1 to 20 and the absorbers of Comparative Examples 1 to 2 were compared. In the absorbers of Examples 1 to 20, the second nonwoven fabric was composed only of hydrophilic fibers, whereas in the absorbers of Comparative Examples 1 to 2, the second nonwoven fabric was composed only of hydrophobic fibers. It was to be done. Also, if we focus on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, and the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer, In the absorbers of Comparative Examples 1 to 2, the liquid diffusivity of the second nonwoven fabric was inferior to that of the first layer and the second layer, whereas the absorbers of Examples 1 to 20 had The liquid diffusibility of the second nonwoven fabric was superior to that of the first layer and the second layer. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of Comparative Examples 1 and 2. Furthermore, it can be said that the thickness of the absorber of Examples 1 to 20 is significantly thinner than that of Comparative Example 1.
　実施例１～２０の吸収体と比較例３の吸収体とを対比した。第２の不織布の液拡散面積を第１の層の液拡散面積で除した値に着目すると、比較例３の吸収体は第２の不織布の液拡散面積に対し第１の層の液拡散面積が極端に小さいものであったのに比べ、実施例１～２０の吸収体は第２の不織布の液拡散面積に対し第１の層の液拡散面積が適度に小さいものであった。このことにより、実施例１～２０の吸収体の吸収特性は、比較例３の吸収体の吸収特性よりも優れていた。 The absorbers of Examples 1 to 20 and the absorber of Comparative Example 3 were compared. Focusing on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, the absorber of Comparative Example 3 shows that the liquid diffusion area of the first layer is smaller than the liquid diffusion area of the second nonwoven fabric. was extremely small, whereas in the absorbers of Examples 1 to 20, the liquid diffusion area of the first layer was appropriately small compared to the liquid diffusion area of the second nonwoven fabric. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of the absorber of Comparative Example 3.
　実施例１～２０の吸収体と比較例４の吸収体とを対比した。第２の不織布の液拡散面積を第１の層の液拡散面積で除した値に着目すると、比較例４の吸収体は第２の不織布の液拡散面積が第１の層の液拡散面積より劣るものであったのに対し、実施例１～２０の吸収体は第２の不織布の液拡散面積が第１の層の液拡散面積より優れるものであった。このことにより、実施例１～２０の吸収体の吸収特性は、比較例４の吸収体の吸収特性よりも優れていた。 The absorbers of Examples 1 to 20 and the absorber of Comparative Example 4 were compared. Focusing on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer, it is found that in the absorber of Comparative Example 4, the liquid diffusion area of the second nonwoven fabric is larger than the liquid diffusion area of the first layer. In contrast, in the absorbers of Examples 1 to 20, the liquid diffusion area of the second nonwoven fabric was superior to that of the first layer. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of the absorber of Comparative Example 4.
　実施例１～２０の吸収体と比較例５の吸収体とを対比した。第２の不織布の液拡散面積を第２の層の液拡散面積で除した値に着目すると、比較例５の吸収体は第２の不織布の液拡散面積に対し第２の層の液拡散面積が極端に小さいものであったのに比べ、実施例１～２０の吸収体は第２の不織布の液拡散面積に対し第２の層の液拡散面積が適度に小さいものであった。このことにより、実施例１～２０の吸収体の吸収特性は、比較例５の吸収体の吸収特性よりも優れていた。 The absorbers of Examples 1 to 20 and the absorber of Comparative Example 5 were compared. Focusing on the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer, the absorber of Comparative Example 5 has a liquid diffusion area of the second layer that is smaller than the liquid diffusion area of the second nonwoven fabric. In contrast, in the absorbers of Examples 1 to 20, the liquid diffusion area of the second layer was appropriately small compared to the liquid diffusion area of the second nonwoven fabric. As a result, the absorption properties of the absorbers of Examples 1 to 20 were superior to those of the absorber of Comparative Example 5.
　次に、実施例１の吸収体と実施例２の吸収体とを対比した。実施例２の吸収体が備える第１の層の液拡散面積よりも実施例１の吸収体が備える第１の層の液拡散面積の方が大きく、また、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値は、実施例２の吸収体よりも実施例１の吸収体の方が適度に小さい。このことにより、実施例１の吸収体の吸収特性は、実施例２の吸収体の吸収特性よりも優れていた。 Next, the absorber of Example 1 and the absorber of Example 2 were compared. The liquid diffusion area of the first layer of the absorber of Example 1 is larger than that of the first layer of the absorber of Example 2, and the liquid diffusion area of the second nonwoven fabric is larger than that of the first layer of the absorber of Example 2. The value divided by the liquid diffusion area of the first layer is appropriately smaller in the absorber of Example 1 than in the absorber of Example 2. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 2.
　実施例１の吸収体と実施例３の吸収体とを対比した。実施例３の吸収体が備える第１の層の液拡散面積よりも実施例１の吸収体が備える第１の層の液拡散面積の方が適度に小さく、実施例１の吸収体では第１の層からの液漏れをより抑制することができた。このことにより、実施例１の吸収体の吸収特性は、実施例３の吸収体の吸収特性よりも優れていた。 The absorber of Example 1 and the absorber of Example 3 were compared. The liquid diffusion area of the first layer included in the absorber of Example 1 is moderately smaller than the liquid diffusion area of the first layer included in the absorber of Example 3. It was possible to further suppress liquid leakage from the layer. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 3.
　実施例１の吸収体と実施例４の吸収体とを対比した。第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、実施例４の吸収体よりも実施例１の吸収体の方が適度に大きく、実施例１の吸収体では第２の層からの液漏れをより抑制することができた。このことにより、実施例１の吸収体の吸収特性は、実施例４の吸収体の吸収特性よりも優れていた。 The absorbent body of Example 1 and the absorbent body of Example 4 were compared. The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is moderately larger for the absorber of Example 1 than for the absorber of Example 4. In this case, it was possible to further suppress liquid leakage from the second layer. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 4.
　実施例１の吸収体と実施例５の吸収体とを対比した。第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、実施例５の吸収体よりも実施例１の吸収体の方が適度に小さく、実施例１の吸収体では第２の不織布からの液漏れをより抑制することができた。このことにより、実施例１の吸収体の吸収特性は、実施例５の吸収体の吸収特性よりも優れていた。 The absorbent body of Example 1 and the absorbent body of Example 5 were compared. The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is moderately smaller for the absorber of Example 1 than for the absorber of Example 5. In this case, it was possible to further suppress liquid leakage from the second nonwoven fabric. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorber of Example 5.
　また、実施例１の吸収体と実施例１６～１７の吸収体とを対比した。実施例１６～１７の吸収体は第２の不織布の液拡散面積を第１の層の液拡散面積で除した値と第２の不織布の液拡散面積を第２の層の液拡散面積で除した値とが同じであるのに対し、実施例１の吸収体は第２の不織布の液拡散面積を第２の層の液拡散面積で除した値よりも第２の不織布の液拡散面積を第１の層の液拡散面積で除した値の方が小さい。このことにより、実施例１の吸収体の吸収特性は、実施例１６～１７の吸収体の吸収特性よりも優れていた。 Additionally, the absorber of Example 1 and the absorbers of Examples 16 and 17 were compared. The absorbers of Examples 16 and 17 had the following values: the liquid diffusion area of the second nonwoven fabric divided by the liquid diffusion area of the first layer, and the liquid diffusion area of the second nonwoven fabric divided by the liquid diffusion area of the second layer. On the other hand, in the absorber of Example 1, the liquid diffusion area of the second nonwoven fabric was greater than the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer. The value divided by the liquid diffusion area of the first layer is smaller. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorbers of Examples 16 and 17.
　また、実施例１の吸収体と実施例１８～１９の吸収体とを対比した。第１の層および第２の層のそれぞれにおける接着剤の散布量は、実施例１８～１９の吸収体よりも実施例１の吸収体の方が適度に小さい。実施例１８～１９の吸収体が備える第１の層の液拡散面積より実施例１の吸収体が備える第１の層の液拡散面積の方が適度に大きく、実施例１の吸収体では第１の層における吸水ポリマーや第１の不織布自体の尿等の吸収量を向上することができた。また、第２の不織布の液拡散面積を第１の層の液拡散面積で除した値は、実施例１８～１９の吸収体よりも実施例１の吸収体の方が適度に小さい。また、第２の不織布の液拡散面積を第２の層の液拡散面積で除した値は、実施例１８～１９の吸収体よりも実施例１の吸収体の方が適度に小さい。このことにより、実施例１の吸収体の吸収特性は、実施例１８～１９の吸収体の吸収特性よりも優れていた。 Additionally, the absorber of Example 1 and the absorbers of Examples 18 and 19 were compared. The amount of adhesive sprayed in each of the first layer and the second layer is appropriately smaller in the absorbent body of Example 1 than in the absorbent bodies of Examples 18-19. The liquid diffusion area of the first layer included in the absorbent body of Example 1 is moderately larger than the liquid diffusion area of the first layer included in the absorbent body of Examples 18 to 19. It was possible to improve the absorption amount of urine, etc. of the water-absorbing polymer in the first layer and the first nonwoven fabric itself. Further, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is appropriately smaller in the absorbent body of Example 1 than in the absorbent bodies of Examples 18 and 19. Furthermore, the value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is appropriately smaller in the absorbent body of Example 1 than in the absorbent bodies of Examples 18 and 19. As a result, the absorption properties of the absorber of Example 1 were superior to those of the absorbers of Examples 18-19.
　本発明の吸収体は、吸収特性に優れる吸収体であり、テープタイプ紙おむつ、パンツタイプ紙おむつ、生理用ナプキン、尿取りパッド等の種々の衛生材料製品として好適に用いることができる。  The absorbent body of the present invention is an absorbent body with excellent absorption properties, and can be suitably used as various sanitary material products such as tape-type disposable diapers, pants-type disposable diapers, sanitary napkins, and urine absorbing pads.​

Claims (7)

  1. 第１の不織布、第１の吸水ポリマー群、第２の不織布、第２の吸水ポリマー群および第３の不織布を、この順に備え、かつ、厚さが４．０ｍｍ以下の吸収体であり、
    前記第１の不織布および前記第１の吸水ポリマー群は、第１の層を形成しており、
    前記第３の不織布および前記第２の吸水ポリマー群は、第２の層を形成しており、
    前記第１の吸水ポリマー群は、第１の不織布に直接的または間接的に固定されており、
    前記第２の吸水ポリマー群は、第３の不織布に直接的または間接的に固定されており、
    前記第２の不織布は、親水性繊維を前記第２の不織布の全体に対して６０質量％以上、含有しており、
    前記第１の層の液拡散面積は、４０～９０ｃｍ２であり、
    前記第２の不織布の液拡散面積を前記第１の層の液拡散面積で除した値は、１．１～２．０であり、
    前記第２の不織布の液拡散面積を前記第２の層の液拡散面積で除した値は、１．１～２．５である、
    吸収体。     An absorbent body comprising a first non-woven fabric, a first water-absorbing polymer group, a second non-woven fabric, a second water-absorbing polymer group and a third non-woven fabric in this order, and having a thickness of 4.0 mm or less,
    The first nonwoven fabric and the first water-absorbing polymer group form a first layer,
    The third nonwoven fabric and the second water-absorbing polymer group form a second layer,
    The first water-absorbing polymer group is directly or indirectly fixed to the first nonwoven fabric,
    The second water-absorbing polymer group is directly or indirectly fixed to the third nonwoven fabric,
    The second nonwoven fabric contains hydrophilic fibers in an amount of 60% by mass or more based on the entire second nonwoven fabric,
    The liquid diffusion area of the first layer is 40 to 90 cm 2 ,
    The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the first layer is 1.1 to 2.0,
    The value obtained by dividing the liquid diffusion area of the second nonwoven fabric by the liquid diffusion area of the second layer is 1.1 to 2.5.
    Absorber.
  2. 前記親水性繊維がレーヨン繊維である、請求項１に記載の吸収体。 The absorbent body according to claim 1, wherein the hydrophilic fiber is a rayon fiber.
  3. 前記第２の不織布の目付量が、２０～５０ｇ／ｍ２であり、請求項１または２に記載の吸収体。 The absorbent body according to claim 1 or 2, wherein the second nonwoven fabric has a basis weight of 20 to 50 g/m 2 .
  4. 前記第１の不織布は、単繊維強度が０．１５Ｎ以上である短繊維Ａを含み、
    前記短繊維Ａの含有量が、前記第１の不織布の全体に対し５～４０質量％である、請求項１～３のいずれかに記載の吸収体。     The first nonwoven fabric includes short fibers A having a single fiber strength of 0.15N or more,
    The absorbent body according to any one of claims 1 to 3, wherein the content of the short fibers A is 5 to 40% by mass based on the entire first nonwoven fabric.
  5. 前記第１の吸水ポリマー群の目付量が、５０～４００ｇ／ｍ２である、請求項１～４のいずれかに記載の吸収体。 The absorbent body according to any one of claims 1 to 4, wherein the first water-absorbing polymer group has a basis weight of 50 to 400 g/m 2 .
  6. 前記第２の吸水ポリマー群に含まれる吸水ポリマーの飽和吸収量が、２５～７０ｇ／ｇである、請求項１～５のいずれかに記載の吸収体。 The absorbent body according to any one of claims 1 to 5, wherein the water absorbing polymer included in the second water absorbing polymer group has a saturated absorption amount of 25 to 70 g/g.
  7. 請求項１～６のいずれかに記載の吸収体を備える、衛生材料製品。 A sanitary material product comprising the absorbent body according to any one of claims 1 to 6.
PCT/JP2023/030953 2022-09-13 2023-08-28 Absorbent and sanitary material product WO2024057895A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076857A1 (en) * 2008-12-29 2010-07-08 住友精化株式会社 Water-absorbent sheet composition
JP2018166876A (en) * 2017-03-30 2018-11-01 大王製紙株式会社 Absorbent article
JP2019041867A (en) * 2017-08-30 2019-03-22 大王製紙株式会社 Absorbent article
JP2021010625A (en) * 2019-07-08 2021-02-04 東レ株式会社 Absorber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076857A1 (en) * 2008-12-29 2010-07-08 住友精化株式会社 Water-absorbent sheet composition
JP2018166876A (en) * 2017-03-30 2018-11-01 大王製紙株式会社 Absorbent article
JP2019041867A (en) * 2017-08-30 2019-03-22 大王製紙株式会社 Absorbent article
JP2021010625A (en) * 2019-07-08 2021-02-04 東レ株式会社 Absorber

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