WO2013099634A1 - 吸水シート構成体 - Google Patents
吸水シート構成体 Download PDFInfo
- Publication number
- WO2013099634A1 WO2013099634A1 PCT/JP2012/082381 JP2012082381W WO2013099634A1 WO 2013099634 A1 WO2013099634 A1 WO 2013099634A1 JP 2012082381 W JP2012082381 W JP 2012082381W WO 2013099634 A1 WO2013099634 A1 WO 2013099634A1
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- WIPO (PCT)
- Prior art keywords
- water
- absorbent
- sheet structure
- adhesive
- nonwoven fabric
- Prior art date
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- 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
- A61F13/45—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 shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
-
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—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
- A61F13/56—Supporting or fastening means
- A61F13/66—Garments, holders or supports not integral with absorbent pads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- 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
- A61F2013/530481—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 superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/53051—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 superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
- A61F2013/530547—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 superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged positioned in a separate layer or layers
Definitions
- the present invention relates to a water absorbent sheet structure that can be used in the fields of hygiene materials, agriculture, construction materials, and the like. Specifically, the present invention relates to a water-absorbent sheet structure that is thin and can be suitably used for absorbent articles such as incontinence pads. Furthermore, this invention relates to absorbent articles, such as an incontinence pad using this water absorbing sheet structure.
- Absorbent articles typified by incontinence pads, etc., have an absorbent body that absorbs liquids such as body fluids, a flexible liquid-permeable surface sheet (top sheet) placed on the side in contact with the body, and the opposite side in contact with the body And a liquid impervious back sheet (back sheet) disposed between the two.
- a flexible liquid-permeable surface sheet top sheet placed on the side in contact with the body, and the opposite side in contact with the body
- back sheet a liquid impervious back sheet
- a water absorbent sheet structure having a structure in which an absorbent layer containing a water absorbent resin and an adhesive is divided by a specific water permeable substrate (for example, see Patent Document 2). ), And an absorbent layer containing a water absorbent resin and an adhesive is divided into a primary absorbent layer and a secondary absorbent layer, and each of the primary absorbent layer and the secondary absorbent layer has a water absorbent property.
- a water-absorbent sheet structure see, for example, Patent Document 3 in which a resin has specific performance has also been proposed.
- the problem of the present invention is that even if it is thin, it has good shape retention, so that it does not lose its shape before or after absorption of liquid, and has excellent liquid permeability, absorption capacity such as a small amount of liquid reversion.
- the object is to provide a water absorbent sheet structure and an absorbent article using the structure.
- the present invention [1] A water absorbent sheet structure in which an absorbent layer containing a water absorbent resin and an adhesive is sandwiched from above and below the absorbent layer by a nonwoven fabric, wherein the absorbent layer is vertically moved by a fiber substrate.
- the water-absorbing resin content is 100 to 600 g / m 2 and the adhesive content is the water-absorbing resin content.
- the water-absorbing sheet structure which is less than [2] relates to an absorbent article in which the water-absorbing sheet structure described in [1] is sandwiched between a liquid-permeable sheet and a liquid-impermeable sheet.
- the water-absorbent sheet structure of the present invention is thin, its shape retention is good, so it does not lose its shape before or after liquid absorption, and has excellent liquid permeability, a small amount of liquid reversal, etc. Produces an excellent effect of sufficiently exhibiting the above. Therefore, by using the water absorbent sheet structure of the present invention as an absorbent body such as an incontinence pad, it is possible to provide an absorbent article that is thin and excellent in appearance design.
- FIG. 1 is a schematic cross-sectional view of an example of the water absorbent sheet structure of the present invention.
- FIG. 2 is a schematic cross-sectional view of another example of the water absorbent sheet structure of the present invention.
- Drawing 3 is a mimetic diagram showing the schematic structure of the instrument for measuring form maintenance nature of a water absorption sheet constituent.
- Drawing 4 is a mimetic diagram showing the schematic structure of the instrument for measuring the leak test in the inclination of a water absorption sheet constituent.
- the water absorbent sheet structure of the present invention is a water absorbent sheet structure having a structure in which an absorbent layer containing a water absorbent resin and an adhesive is sandwiched from above and below the absorbent layer by a nonwoven fabric, and the water absorbent resin and the adhesive An absorbent layer is formed between the nonwoven fabrics using a predetermined amount, and the absorbent layer is divided into a primary absorbent layer and a secondary absorbent layer vertically by a fiber substrate, and the primary absorbent layer and the secondary absorbent layer.
- the water absorbent sheet structure is characterized in that the ratio of the mass of the water absorbent resin of the primary absorbent layer to the total mass of the water absorbent resin of the layer is in a specific range.
- the water absorbent resin since the water absorbent resin is fixed to the nonwoven fabric by the adhesive, the water absorbent resin can be biased even if it does not substantially contain hydrophilic fibers such as pulp fibers. Dissipation can be prevented, and shape retention is also kept good.
- the amount of adhesive in a specific range, the entire surface of the water-absorbent resin is not covered with the adhesive, but a part of the surface is fixed, so that the water-absorbing performance of the water-absorbent resin is almost hindered. It is considered that the water-absorbent resin can sufficiently swell.
- the water absorbent sheet structure of the present invention may be an aspect in which hydrophilic fibers such as pulp fibers are mixed with the water absorbent resin between the nonwoven fabrics in such an amount that does not impair the effects of the present invention. From this point of view, it is preferable that the embodiment does not substantially contain hydrophilic fibers.
- water-absorbing resin in the water-absorbent sheet structure of the present invention commercially available water-absorbing resins can be used, for example, starch-acrylonitrile graft copolymer hydrolyzate, starch-acrylic acid graft polymer neutralized product. Saponified products of vinyl acetate-acrylic acid ester copolymers, cross-linked products of partially neutralized acrylic acid polymers, water-absorbing resins such as partially neutralized polyacrylic acid, and the like. Among these, a cross-linked product of a partially neutralized acrylic acid polymer is preferable from an industrial viewpoint such as supply capacity and cost. Examples of a method for synthesizing a crosslinked product of a partially neutralized acrylic acid polymer include a reverse phase suspension polymerization method and an aqueous solution polymerization method.
- the content of the water-absorbent resin in the water-absorbent sheet structure is sufficient to absorb liquid even when the water-absorbent sheet structure of the present invention is used in absorbent articles. From the viewpoint of obtaining performance, it is 100 to 600 g (that is, 100 to 600 g / m 2 ) per square meter of the water absorbent sheet structure, preferably 150 to 550 g / m 2 , more preferably 200 to 500 g / m 2 . is there.
- the content is 100 g / m 2 or more from the viewpoint of exhibiting sufficient liquid absorption performance as a water-absorbent sheet structure, particularly suppressing the amount of liquid reversal, and from the viewpoint of improving the liquid penetration rate, the content Is 600 g / m 2 or less.
- the ratio of the mass of the water absorbent resin of the primary absorbent layer to the total mass of the water absorbent resin of the primary absorbent layer and the secondary absorbent layer is 15% or more and less than 50%, preferably 20 to 45%, preferably 25 to 45%. % Is more preferable. From the viewpoint of increasing the liquid permeation rate, the ratio of the primary absorption layer is less than 50%, and from the viewpoint of increasing the dry feeling after liquid absorption and reducing the reversal of the liquid, the ratio of the primary absorption layer is 15% or more. It is.
- the liquid absorption performance of the water absorbent sheet structure of the present invention is affected by the water absorption performance of the water absorbent resin used. Therefore, it is preferable to select a water-absorbing resin that is suitable for water-absorbing performance in consideration of the structure of each component of the water-absorbing sheet structure, and the like. Moreover, the water absorbing resin of a primary absorption layer and a secondary absorption layer may be the same, or may differ.
- the water absorption capacity of the water absorbent resin is evaluated as the physiological saline water absorption capacity.
- the physiological saline water-absorbing ability of the water-absorbent resin is preferably 20 g / g or more, more preferably 20 to 80 g / g, from the viewpoint of absorbing more liquid and keeping the gel strong at the time of absorption to prevent the gel blocking phenomenon. 30 to 70 g / g is more preferable.
- the physiological saline water-absorbing ability of the water-absorbent resin is a value obtained by the measuring method described in the examples described later.
- the median particle diameter of the water absorbent resin is a viewpoint that prevents the water absorbent resin from dissipating in the water absorbent sheet structure and the gel blocking phenomenon at the time of water absorption, and reduces the jerky feel of the water absorbent sheet structure to improve the tactile sensation. Therefore, 100 to 600 ⁇ m is preferable, 150 to 550 ⁇ m is more preferable, and 200 to 500 ⁇ m is more preferable.
- the median particle diameter of the water-absorbent resin is a value obtained by the measurement method described in Examples described later.
- Examples of the adhesive used in the water absorbent sheet structure of the present invention include rubber adhesives such as natural rubber, butyl rubber and polyisoprene; styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene- Styrene elastomer adhesives such as styrene block copolymer (SBS), styrene-isobutylene-styrene block copolymer (SIBS), styrene-ethylene-butylene-styrene block copolymer (SEBS); ethylene-vinyl acetate copolymer Adhesive (EVA) adhesive; Ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid derivative copolymer adhesive such as ethylene-butyl acrylate copolymer (EBA); Ethylene-acrylic acid copolymer (EAA) adhesives; polyamide adhesive
- an ethylene-vinyl acetate copolymer adhesive, a styrene-based elastomer adhesive, a polyolefin is used from the viewpoint that the adhesive strength is strong and it is possible to prevent peeling of the nonwoven fabric and dissipation of the water-absorbent resin in the water-absorbent sheet structure.
- At least one selected from the group consisting of a system adhesive and a polyester adhesive is preferred. These adhesives may be used alone or in combination of two or more.
- the melting temperature or softening point of the adhesive is preferably 50 to 180 from the viewpoint of sufficiently fixing the water-absorbent resin to the nonwoven fabric and preventing thermal deterioration and deformation of the nonwoven fabric. ° C, more preferably 70 to 150 ° C.
- the content (multiplier) of the adhesive in the water absorbent sheet structure is 0.05 to 2.0 times, preferably 0.08 to 1.5 times, more preferably 0.1 to 1.5 times the content (mass basis) of the water absorbent resin. 1.0 times.
- the content of the adhesive is 0.05 times or more and water absorption due to excessive adhesion
- the content of the adhesive is 2.0 times or less.
- the non-woven fabric used in the present invention is not particularly limited as long as it is a non-woven fabric known in the art, but from the viewpoint of liquid permeability, flexibility and strength when used as a water-absorbent sheet structure, polyethylene (PE), polypropylene Polyolefin fibers such as (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polyamide fibers such as nylon, rayon fibers, and other non-woven fabrics made of synthetic fibers Nonwoven fabrics produced by mixing cotton, silk, hemp, pulp (cellulose) fibers and the like.
- PE polyethylene
- PP polypropylene Polyolefin fibers
- PET polyethylene terephthalate
- PET polytrimethylene terephthalate
- PEN polyethylene naphthalate
- polyamide fibers such as nylon, rayon fibers, and other non-woven fabrics made of synthetic fibers
- non-woven fabrics synthetic fiber non-woven fabrics are preferably used from the viewpoint of increasing the strength of the water-absorbent sheet structure, and particularly selected from the group consisting of rayon fiber non-woven fabrics, polyolefin fiber non-woven fabrics and polyester fiber non-woven fabrics. Preferably, at least one of them is selected.
- These non-woven fabrics may be a single non-woven fabric of the above fibers or a non-woven fabric combining two or more kinds of fibers.
- spunbond nonwoven fabric is more preferable, and from the viewpoint of further improving the liquid absorption performance and flexibility when forming the sheet, a spunlace nonwoven fabric mainly composed of rayon fibers and an air-through nonwoven fabric of polyolefin fibers are also included in the present invention.
- the nonwoven fabric used is more preferable.
- spunbond nonwoven fabrics a spunbond-meltblown-spunbond (SMS) nonwoven fabric and a spunbond-meltblown-meltblown-spunbond (SMMS) nonwoven fabric having a multilayer structure of polyolefin fibers are more preferably used, especially polypropylene. SMS nonwoven fabric and SMMS nonwoven fabric mainly composed of fibers are preferably used.
- spunlace nonwoven fabric those in which polyolefin fibers and / or polyester fibers are appropriately blended with the main component rayon fibers are preferably used, and among them, rayon / PET nonwoven fabric and rayon / PET / PE nonwoven fabric are preferably used.
- the nonwoven fabric may contain a small amount of pulp fiber to the extent that the thickness of the water-absorbent sheet structure is not increased.
- the hydrophilicity when measured according to the measurement method of “hydrophilicity of nonwoven fabric” described later is preferably 5 to 200, more preferably 8 to 150, and more preferably 10 to 100. More preferably, those of 12 to 80 are even more preferable.
- Such a non-woven fabric having hydrophilicity is not particularly limited.
- non-woven fabrics those using a material having an appropriate hydrophilicity such as rayon fibers may be used, and polyolefin fibers and polyester fibers may be used.
- a hydrophobic chemical fiber may be subjected to a hydrophilization treatment by a known method to give an appropriate degree of hydrophilicity.
- the hydrophilization treatment method include, for example, a method of obtaining a nonwoven fabric by a spunbond method in which a hydrophilic chemical agent is mixed with a hydrophobic chemical fiber in a spunbond nonwoven fabric, or a spunbond nonwoven fabric is prepared by using a hydrophobic chemical fiber.
- Examples of the method include a method in which a hydrophilizing agent is accompanied, or a method in which a spunbonded nonwoven fabric is obtained with hydrophobic chemical fibers and then impregnated with the hydrophilizing agent.
- Hydrophilic agents include anionic surfactants such as aliphatic sulfonates and higher alcohol sulfate esters, cationic surfactants such as quaternary ammonium salts, polyethylene glycol fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acids
- Nonionic surfactants such as esters, silicone surfactants such as polyoxyalkylene-modified silicones, and stain release agents composed of polyester, polyamide, acrylic, and urethane resins are used.
- the nonwoven fabric sandwiching the absorbent layer is preferably hydrophilic from the viewpoint of further improving the liquid absorption performance of the water absorbent sheet structure, but in particular, from the viewpoint of preventing liquid leakage, the nonwoven fabric used below the absorbent layer.
- the hydrophilicity is more preferably equal to or higher than the hydrophilicity of the nonwoven fabric used above.
- the upper side of the absorbent layer means the side to which the liquid to be absorbed is supplied when the absorbent article is produced using the resulting water absorbent sheet structure, and the lower side of the absorbent layer is the opposite side.
- the nonwoven fabric is moderately bulky from the viewpoint of imparting good liquid permeability, flexibility, form retention and cushioning properties to the water absorbent sheet structure of the present invention, and increasing the liquid penetration rate of the water absorbent sheet structure.
- a nonwoven fabric having a large basis weight is preferred.
- the basis weight is preferably 5 to 300 g / m 2 , more preferably 8 to 200 g / m 2 , further preferably 10 to 100 g / m 2 , and still more preferably 11 to 50 g / m 2. It is.
- the thickness of the nonwoven fabric is preferably 20 to 800 ⁇ m, more preferably 50 to 600 ⁇ m, and further preferably 80 to 450 ⁇ m.
- a method for measuring the thickness of the nonwoven fabric a method for measuring the thickness of the water-absorbent sheet structure described below in the dry state can be employed.
- the entire surface or a part of the absorbent layer of the water absorbent sheet structure is formed into an upper primary absorbent layer and a lower secondary absorbent layer in the vertical direction (sheet thickness direction) using a fiber substrate.
- a fiber substrate helps the diffusion of the liquid supplied to the water absorbent sheet structure, and is expected to have a temporary water retention effect until the water absorbent resin absorbs the liquid.
- the secondary absorbent layer cannot be used effectively, and liquid leakage may occur.
- the primary absorbent layer cannot be used effectively, and the liquid is rapidly distributed to the secondary absorbent layer, which may cause gel blocking.
- the hydrophilicity is preferably 8 to 100, more preferably 10 to 80, more preferably 12 to 60 is more preferred.
- Preferable specific examples of such a fiber substrate include sanitary paper, cellulose-containing synthetic fiber nonwoven fabric, rayon-containing synthetic fiber nonwoven fabric, and hydrophilic synthetic fiber nonwoven fabric.
- Examples of the sanitary paper include tissue paper, water absorbent paper, towel paper, and the like.
- Examples of the cellulose-containing synthetic fiber nonwoven fabric include airlaid nonwoven fabric made of pulp / PET / polyethylene (PE), pulp / PET / polypropylene (PP), and pulp / PE / PP.
- Examples of the rayon-containing synthetic fiber nonwoven fabric include spunlace nonwoven fabric made of rayon / PET, rayon / PE, and rayon / PET / PE.
- Examples of the hydrophilic synthetic fiber nonwoven fabric include PE, PP, PE / PP polyolefin air-through nonwoven fabric and spunbond nonwoven fabric, fatty acid ester type nonionic surfactant, polyglycerol fatty acid ester and other hydrophilic interfaces.
- Non-woven fabric coated with an activator may be mentioned.
- rayon-containing synthetic fiber nonwoven fabric and hydrophilized synthetic fiber nonwoven fabric from the viewpoint of the strength of the fiber substrate and various performance aspects (liquid reversal, shape retention, etc.) of the water absorbent sheet structure obtained.
- One type selected from the group consisting of is preferably used, and a synthetic fiber nonwoven fabric subjected to a hydrophilic treatment is more preferably used.
- These fiber substrates may be non-woven fabrics using single fibers or non-woven fabrics combining two or more types of fibers.
- the thickness of the fiber substrate is preferably 80 ⁇ m or more, more preferably 100 to 2000 ⁇ m, and still more preferably 150 to 1000 ⁇ m.
- the basis weight of the fiber substrate is preferably 10 g / m 2 or more, more preferably 12 to 200 g / m 2 . From the viewpoint of thinning the water absorbent sheet structure, the thickness of the fiber substrate is preferably 2000 ⁇ m or less, and the basis weight of the fiber substrate is preferably 200 g / m 2 or less.
- the thickness of the fiber substrate should be 80 ⁇ m or more, and the basis weight of the fiber substrate should be 10 g / m 2 or more preferable.
- a method for measuring the thickness of the fiber substrate a method for measuring the thickness of the water-absorbent sheet structure described below in the dry state can be employed.
- the water absorbent sheet structure of the present invention can be produced, for example, by the following method.
- a mixed powder of a water-absorbent resin and an adhesive is uniformly spread on the nonwoven fabric, the fiber substrate is stacked, and an intermediate is obtained by thermocompression bonding near the melting temperature of the adhesive.
- the mixed powder is sprayed on the intermediate in the same manner as described above, and the non-woven fabrics are stacked and heat-pressed.
- a mixed powder of a water-absorbent resin and an adhesive is uniformly sprayed on the nonwoven fabric, and fixed to such an extent that the powder does not dissipate through a heating furnace. After the fiber substrate is stacked, the mixed powder is again sprayed, and the stacked nonwoven fabrics are collectively heat-pressed.
- the bonding method of the primary absorption layer and the secondary absorption layer can be selected separately from the methods exemplified in (a) to (d) and can be produced in combination.
- embossing may be performed at the time of thermocompression bonding in the production of the water-absorbing sheet structure or after the water-absorbing sheet structure is manufactured.
- additives such as a deodorant, an antibacterial agent and a gel stabilizer may be appropriately blended in the water absorbent sheet structure of the present invention.
- the water absorbent sheet structure of the present invention has one feature in that it can be thinned, and considering the use for absorbent articles, the thickness of the water absorbent sheet structure is preferably in a dry state. It is 4 mm or less, more preferably 3 mm or less, and further preferably 1.0 to 2.5 mm.
- a dry state means the state before a water absorbing sheet structure body absorbs a liquid.
- the dry thickness of the water absorbent sheet structure is a value obtained by the measurement method described in the examples described later.
- the water absorbent sheet structure of the present invention has one feature in that the liquid permeation rate is fast, and considering the use for absorbent articles, the total liquid permeation rate of the water absorbent sheet structure is preferably It is 400 seconds or less, more preferably 350 seconds or less.
- the total liquid permeation rate of the water-absorbent sheet structure is a value obtained by the measurement method described in Examples described later.
- the water absorbent sheet structure of the present invention has one feature in that the amount of liquid reversal is small, and considering the use for absorbent articles, the liquid reversal amount of the water absorbent sheet structure is preferably 12 g. Or less, more preferably 10 g or less. In this specification, the liquid reversal amount of the water absorbent sheet structure is a value obtained by the measurement method described in the examples described later.
- the water absorbent sheet structure of the present invention has one feature in that there is less leakage in the inclination of the liquid, and considering the use for absorbent articles, the total amount of leakage due to the inclination of the water absorbent sheet structure is small. It is preferably 14 g or less, more preferably 12 g or less, and even more preferably 10 g or less. In this specification, the total amount of leakage due to the inclination of the water-absorbent sheet structure is a value obtained by the measurement method described in Examples described later.
- the water absorbent sheet structure of the present invention preferably has a dry state thickness, a total liquid permeation rate, a liquid reversal amount, and a total leakage amount due to inclination having predetermined characteristics.
- the water-absorbent sheet structure of the present invention has a very small amount of a naturally-derived material used, so that it has high performance in the above-described thickness, permeation rate, and liquid return amount, and has also been considered for the environment.
- the use ratio of the natural material is preferably 30% by mass or less, more preferably 20% by mass or less, and further preferably 15% by mass or less.
- the usage ratio of the natural material is calculated by dividing the total content of pulp, cotton, hemp, silk, and the like contained in a small amount in each component of the water absorbent sheet structure by the mass of the water absorbent sheet structure.
- FIG. 1 is an enlarged cross-sectional view schematically showing the structure of the water absorbent sheet structure of the present invention.
- a water absorbent sheet structure 10 shown in FIG. 1 includes a primary absorbent layer 13 containing a water absorbent resin 12 and an adhesive 11, and a secondary absorbent layer 14 containing a water absorbent resin 12 and an adhesive 11. And have.
- the primary absorbent layer refers to a side to which liquid to be absorbed is supplied when an absorbent article is produced using the water absorbent sheet structure, and the secondary absorbent layer sandwiches the fiber substrate 15. The opposite side of the primary absorption layer.
- the water absorbing sheet structure 10 is the primary absorption layer 13, the secondary absorption layer 14, the fiber matrix 15, And a five-layer structure composed of two layers of the front and back nonwoven fabrics 16 and 17 located on the outer surfaces of the primary absorbent layer 13 and the secondary absorbent layer 14, respectively. The structure is sandwiched from above and below the absorbent layer.
- the water absorbent sheet structure shown in FIG. 2 is also an example of another form of the water absorbent sheet structure of the present invention.
- FIG. 2 shows an example in which the adhesive 18 is melt-coated on the nonwoven fabric 17 or the like.
- the absorbent article of the present invention By sandwiching the water absorbent sheet structure of the present invention between a liquid permeable sheet and a liquid impermeable sheet, the absorbent article of the present invention can be obtained.
- the sheet is used in a form in which the sheet is disposed below.
- the liquid permeable sheet and the liquid impermeable sheet those known in the technical field of absorbent articles can be used without particular limitation.
- this absorbent article can be manufactured by a well-known method.
- absorbent article examples include paper diapers, incontinence pads, sanitary napkins, pet sheets, food drip sheets, and power cable waterproofing agents.
- the performance of the water absorbent resin was measured by the following method.
- ⁇ Saline water absorption capacity of water absorbent resin In a 500 mL beaker, 500 g of 0.9 mass% sodium chloride aqueous solution (physiological saline) is weighed, and while stirring at 600 r / min, 2.0 g of the water-absorbent resin is dispersed so as not to generate mako. Allow to stand for 60 minutes with stirring to fully swell the water-absorbent resin. Thereafter, the mass Wa (g) of a standard sieve having a mesh opening of 75 ⁇ m is measured in advance, and using this, the contents of the beaker are filtered so that the sieve has an inclination angle of about 30 degrees with respect to the horizontal.
- a lubricant 0.25 g of amorphous silica (Degussa Japan Co., Ltd., Siperant 200) is mixed with 50 g of the water absorbent resin.
- the mass of the water-absorbent resin remaining on each sieve is calculated as a percentage by mass with respect to the total amount, and the mass of the water-absorbent resin remaining on the sieve opening and the sieve is calculated by integrating in order from the larger particle size.
- the relationship between the percentage and the integrated value is plotted on a logarithmic probability paper. By connecting the plots on the probability paper with a straight line, the particle diameter corresponding to an integrated mass percentage of 50 mass% is defined as the median particle diameter.
- a test piece cut in a strip shape having a width ⁇ length of 10 cm ⁇ 30 cm and having a longitudinal direction in the longitudinal direction (machine direction) of the nonwoven fabric is attached to a test piece mounting apparatus having a 45 ° inclination. Adjust the burette cock opening to supply 10 g of distilled water per 30 seconds. Once the burette is dried, the tip of the burette is 5 mm above the top of the test piece attached to the inclined device. Secure to place. Approximately 60 g of distilled water is charged from the top of the burette, and the time (seconds) from when the liquid begins to drip onto the nonwoven fabric test piece from the burette tip until the liquid leaks from the bottom without holding the liquid is measured. The hydrophilicity of the nonwoven fabric. It is judged that the hydrophilicity is higher as the numerical value is larger.
- the nonwoven fabric material itself has hydrophilicity or has been subjected to a hydrophilic treatment, while the hydrophilicity value is 5 or more, while in a nonwoven fabric with low hydrophilicity, liquid runs near the surface and more There is a tendency for liquid to leak quickly from the bottom.
- SBS styrene-butadiene-styrene block copolymer
- a laminating machine Hashima Co., Ltd .: linear adhesive press HP-600LF
- the SBS was applied as an adhesive onto a non-woven fabric B, which is an intermediate product of the water-absorbing sheet, on a hot melt coater set at a heating temperature of 150 ° C. with a basis weight of 6 g / m 2 .
- a water-absorbing resin was charged into the charging port of the roller type spreader.
- a water absorbent sheet constituting intermediate was laid on the conveyor at the lower part of the spreader so that the adhesive application surface was the upper surface.
- the water-absorbing resin was uniformly laminated on the intermediate body of the water-absorbent sheet structure with a basis weight of 100 g / m 2 by operating the spreading roller and the lower conveyor.
- the obtained laminate was sandwiched by another nonwoven fabric B coated with SBS in the same manner as described above at a basis weight of 6 g / m 2 from the top, and then a laminating machine with a heating temperature set at 100 ° C. These were integrated by heat-sealing with a linear adhesive press HP-600LF manufactured by Hashima to obtain a water-absorbent sheet structure. If the cross section of the structure of the obtained water-absorbing sheet composition is schematically shown, the structure is as shown in FIG.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described later were performed so that the absorbent layer using the water-absorbent resin weight per unit area of 100 g / m 2 was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 2 a water-absorbent sheet structure was obtained by the same method as in Example 1 except that the water-absorbing resin used and the content of the adhesive were changed as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described below were performed so that the absorbent layer using the basis weight of 120 g / m 2 of the water-absorbent resin was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 4 a water-absorbent sheet structure was obtained by the same method as in Example 1 except that the water-absorbing resin used and the content of the adhesive were changed as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described later were performed so that the absorbent layer using the water-absorbent resin weight per unit area of 150 g / m 2 was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 5 105 parts by mass of an ethylene-vinyl acetate copolymer (EVA; melting temperature 95 ° C.) as an adhesive and 350 masses of a water-absorbing resin at the inlet of a roller-type spreader (manufactured by Hashima Co., Ltd .: Sinter Ace M / C) The product was mixed uniformly with the part. On the other hand, a non-woven fabric A having a width of 15 cm was laid on the conveyor at the bottom of the roller type spreader. Subsequently, the mixture was uniformly laminated on the nonwoven fabric with a basis weight of 455 g / m 2 by operating a spraying roller and a lower conveyor.
- EVA ethylene-vinyl acetate copolymer
- the obtained laminate was sandwiched from above by nonwoven fabric B as a fiber substrate, and then heat-sealed with a laminating machine (manufactured by HASHIMA Co., Ltd .: linear adhesive press HP-600LF) set at a heating temperature of 130 ° C. These were integrated to obtain a water absorbent sheet constituting intermediate.
- a laminating machine manufactured by HASHIMA Co., Ltd .: linear adhesive press HP-600LF
- the obtained laminate was sandwiched from above by the same nonwoven fabric B as above, and then heat-sealed with a laminating machine (manufactured by HASHIMA Co., Ltd .: linear adhesive press HP-600LF) set to a heating temperature of 130 ° C. These were integrated to obtain a water absorbent sheet structure. If the cross section of the structure of the obtained water-absorbing sheet composition is schematically shown, the structure is as shown in FIG.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described later were performed so that the absorbent layer using the water-absorbent resin weight per unit area of 150 g / m 2 was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 1 a water-absorbent sheet structure was obtained by the same method as in Example 1 except that the water-absorbing resin used and the content of the adhesive were changed as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described below were performed so that the absorbent layer using the basis weight of the water-absorbent resin was 140 g / m 2 was placed upward (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 2 (Comparative Example 2) In Example 5, the water absorbing sheet structure was obtained by the same method as Example 1 except having changed the content of the water absorbing resin to be used and the adhesive as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described below were performed so that the absorbent layer using the basis weight of the water-absorbent resin was 70 g / m 2 was placed upward (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 5 (Comparative Example 3) In Example 5, the water absorbing sheet structure was obtained by the same method as Example 1 except having changed the content of the water absorbing resin to be used and the adhesive as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described below were performed so that the absorbent layer using the basis weight of 320 g / m 2 of the water-absorbent resin was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 4 a water-absorbent sheet structure was obtained by the same method as in Example 1 except that the water-absorbing resin used and the content of the adhesive were changed as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described below were performed so that the absorbent layer using the water-absorbent resin weight per unit area of 20 g / m 2 was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 5 the water absorbing sheet structure was obtained by the same method as Example 1 except having changed the content of the water absorbing resin to be used and the adhesive as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described below were performed so that the absorbent layer using the basis weight of 120 g / m 2 of the water-absorbent resin was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- Example 6 the water absorbing sheet structure was obtained by the same method as Example 1 except having changed the content of the water absorbing resin to be used and the adhesive as described in Table 1.
- the obtained water-absorbent sheet structure was cut into a predetermined size, and various measurements described later were performed so that the absorbent layer using the water-absorbent resin weight per unit area of 150 g / m 2 was on the upper side (primary absorbent layer). Evaluation was performed. The results are shown in Table 1.
- the thickness of the water absorbent sheet structure obtained was measured using a thickness measuring instrument (manufactured by Ozaki Mfg. Co., Ltd., model number: JB). As the measurement locations, the left end, the center, and the right end are arbitrarily determined in the longitudinal direction. For example, in the case of 7.5 ⁇ 20 cm, 5 cm from the left is the left end, 10 cm is the center, and 15 cm is the right end. In the width direction, a uniform central portion was measured.
- Measured values of thickness were measured three times at each location and averaged. Furthermore, the values of the left end, the center, and the right end were averaged to obtain the thickness of the entire water absorbent sheet structure.
- ⁇ Form retention of water absorbent sheet structure The form retention of the water absorbent sheet structure was evaluated by the following method.
- the obtained water absorbent sheet structure was cut to a size of 10 ⁇ 10 cm.
- a double-sided tape was applied to the entire surface of each side of two 10 ⁇ 10 cm acrylic plates (mass: about 60 g). As shown in FIG. 3, the double-sided tape was sandwiched from above and below so that the diagonal lines of the acrylic plates 21 and 22 formed 45 degrees and the double-sided tape faced the water-absorbing sheet constituting body 23, and pressure-bonded so as not to move.
- the test piece of the water absorbent sheet structure thus prepared was put in a metal tray of a sieve used in the above ⁇ Medium particle diameter of water absorbent resin>, covered, and then shaken with a low tap. Tapping with a machine for 3 minutes (At this time, there may be several layers of mesh sieve as a spacer between the tray and the tapping machine). Based on the appearance after tapping, the shape retention of the water absorbent sheet structure was evaluated according to the following criteria.
- A The appearance does not change, and it does not move easily even if the acrylic plate is moved.
- B Although there is no change in appearance, when the acrylic plate is shifted, it peels off from the center of the water absorbent sheet structure.
- C The water absorbent sheet structure is split into two from the center, and the contents are scattered.
- a polyethylene air-through porous liquid permeable sheet having the same size as the sample (7.5 ⁇ 20 cm) and a basis weight of 22 g / m 2 was placed on top of the sample (water-absorbing sheet structure). Further, a polyethylene liquid-impermeable sheet having the same size and basis weight as this sheet was placed under the sample to prepare a simple absorbent article. Near the center of this absorbent article, an acrylic plate with a bottom area of 16.8cm 2 with a cylinder with an inner diameter of 1.9cm and a height of 20cm is placed in the center, and a weight is placed on the acrylic plate. Such a state was assumed.
- the time until the test solution completely penetrates into the absorbent article was measured and used as the first liquid permeation rate (second). Subsequently, the same operation was performed 3 minutes after the completion of the test liquid absorption, and the second liquid permeation rate (second) was measured. The total number of seconds of the first and second liquid penetration rates was taken as the total liquid penetration rate.
- the test solution is dropped onto the absorbent article 33 placed on the plate with a dropping funnel 34 from above vertically. This is a mechanism for measuring the amount of leakage with a balance 35. Detailed specifications are shown below.
- the acrylic plate 32 is 45 cm long in the direction of the inclined surface, and is fixed by the gantry 31 so that the angle formed with respect to the horizontal is 45 ⁇ 2 °.
- the acrylic plate 32 had a width of 100 cm and a thickness of 1 cm, and it was also possible to measure a plurality of water-absorbing sheet constituting bodies 33 in parallel. Since the surface of the acrylic plate 32 was smooth, no liquid stayed or was absorbed on the plate.
- the dropping funnel 34 was fixed vertically above the inclined acrylic plate 32 using the gantry 31.
- the dropping funnel 34 had a capacity of 100 mL, an inner diameter of the tip portion of about 4 mm, and the cock throttle was adjusted so that the liquid was introduced at 10 mL / second.
- a balance 35 on which a tray 36 was placed was installed under the acrylic plate 32. All the test liquids that flowed down as a leak were received, and the mass was recorded with an accuracy of 0.1 g.
- the leak test in the inclination using such an apparatus was performed according to the following procedure. After measuring the mass of a water-absorbent sheet structure that is 7.5 cm wide ⁇ 20 cm long and cut so that the longitudinal direction is the longitudinal direction of the nonwoven fabric (machine direction), the liquid permeability of air-through polyethylene of the same size A simple absorbent article 33 prepared by attaching a non-woven fabric (weight per unit area 22 g / m 2 ) from above, and further attaching a liquid impervious sheet made of polyethylene of the same size and weight per unit from below, (The lower end of the absorbent article 33 was not pasted on the acrylic plate 32 in order not to stop leakage intentionally).
- a mark was made at a location 2 cm below the upper end of the absorbent article 33, and the inlet of the dropping funnel 34 was fixed so that the distance vertically above the mark was 10 ⁇ 1 mm.
- test solution After starting the balance 35 and correcting the display to zero, 50 mL of the test solution was put into the dropping funnel 34 at a time. The test liquid flowed through the inclined acrylic plate 32 without being absorbed by the absorbent article 33, and the amount of liquid that entered the tray 36 was measured to obtain the first leakage amount (g).
- the second test solution was added in the same manner, and the second leakage amount (g) was measured.
- the total (g) of the first and second leaks was taken as the total leak in the slope.
- the water-absorbent sheet structures of Examples 1 to 5 have a higher liquid permeation rate, a smaller amount of liquid reversion, a smaller amount of leakage at the inclination, and a liquid absorption compared to those of Comparative Examples 1 to 6. It can be seen that the performance is good and the form retainability is also excellent.
- the ratio of the water-absorbing resin in the primary absorbent layer is 50% or more (Comparative Example 1)
- the ratio of the secondary absorbent layer is relatively small.
- the evaluation of the first leak rate is low.
- the proportion of the water-absorbing resin in the primary absorbent layer is less than 15% (Comparative Example 2)
- the ratio of the secondary absorbent layer is relatively increased, resulting in a gel blocking phenomenon, and the amount of leakage in the slope, particularly the second time.
- the evaluation of the amount of leakage and liquid return is low.
- the water-absorbent sheet structure of the present invention can be used for absorbent articles in the sanitary material field, agricultural field, building material field, etc., and in particular, it can be suitably used for absorbent articles such as incontinence pads in the sanitary material field. Can do.
Abstract
Description
〔1〕 吸水性樹脂及び接着剤を含有してなる吸収層が、不織布により該吸収層の上方及び下方から挟持された構造を有する吸水シート構成体であって、繊維基質により前記吸収層が上下に1次吸収層と2次吸収層とに分割されてなる構造を有し、前記吸水性樹脂の含有量が100~600g/m2であり、前記接着剤の含有量が吸水性樹脂の含有量(質量基準)に対して0.05~2.0倍であり、1次吸収層と2次吸収層の吸水性樹脂の合計質量に対する1次吸収層の吸水性樹脂の質量の割合が15%以上50%未満である吸水シート構成体、並びに
〔2〕 前記〔1〕記載の吸水シート構成体が、液体透過性シートと液体不透過性シートの間に挟持されている吸収性物品
に関する。
500mL容のビーカーに、0.9質量%塩化ナトリウム水溶液(生理食塩水)500gを量り取り、600r/minで撹拌させながら、吸水性樹脂2.0gを、ママコが発生しないように分散させる。撹拌させた状態で60分間放置し、吸水性樹脂を十分に膨潤させる。その後、あらかじめ目開き75μm標準篩の質量Wa(g)を測定しておき、これを用いて、前記ビーカーの内容物をろ過し、篩いを水平に対して約30度の傾斜角となるように傾けた状態で、30分間放置することにより余剰の水分をろ別する。膨潤した吸水性樹脂の入った篩いの質量Wb(g)を測定し、以下の式により、吸水性樹脂の生理食塩水吸水能を求める。
吸水性樹脂50gに、滑剤として、0.25gの非晶質シリカ(デグサジャパン(株)、Siperant 200)を混合する。
本明細書において、不織布の親水度は、紙パルプ試験方法No.68(2000)に記載の「はっ水性試験方法」に記載の装置を用いて測定する。
加熱温度を150℃に設定したホットメルト塗工機(株式会社ハリーズ製:マーシャル150)上に、幅15cmのスパンレース不織布(繊維:レーヨン/PET、目付量:35g/m2、厚み:300μm、親水度=38;「不織布A」とする)を敷いた後、接着剤としてスチレン-ブタジエン-スチレンブロック共重合体(SBS;軟化点85℃)を目付量15g/m2で当該不織布上に塗布した。
実施例1において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
実施例1において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
ローラー型散布機(株式会社ハシマ製:シンターエースM/C)の投入口に、接着剤としてのエチレン-酢酸ビニル共重合体(EVA;溶融温度95℃)105質量部と、吸水性樹脂350質量部とを均一混合させたものを仕込んだ。一方、ローラー型散布機下部のコンベアーに、幅15cmの不織布Aを敷いた。次いで、散布ローラーと下部コンベアーを稼動させることにより、前記混合物を目付量455g/m2で前記不織布上に均一に積層した。
実施例1において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
実施例5において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
実施例5において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
実施例1において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
実施例5において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
実施例5において、使用する吸水性樹脂並びに接着剤の含有量を、表1に記載された通りに変更した以外は、実施例1と同様の方法によって吸水シート構成体を得た。
得られた吸水シート構成体の厚みは、厚み測定器(株式会社尾崎製作所製、型番:J-B)を用いて測定した。測定箇所として、長手方向に左端、中央、右端の3箇所を任意に決め、例えば7.5×20cmの場合、左から5cmを左端、10cmを中央、15cmを右端とする。幅方向は均等な中央部を測定した。
吸水シート構成体の形態保持性は以下の方法によって評価した。
得られた吸水シート構成体を10×10cmの大きさにカットした。次いで2枚の10×10cmアクリル板(質量約60g)の各片面の全面に両面テープを貼り付けた。図3に示すように、アクリル板21、22の対角線が45度を成すように、かつ両面テープが吸水シート構成体23側を向くように上下から挟みこんで、動かないよう圧着した。
B:外観に変化無いが、アクリル板をずらすと、吸水シート構成体中央から剥がれる。
C:吸水シート構成体は中央から2つに分裂し、内容物が散乱する。
吸水シート構成体を7.5×20cmの短冊状で、長手方向が不織布の縦方向(機械方向)となるように切断したものを、サンプルとして使用した。
液体逆戻り量(g)=Wd-Wc(g)
傾斜における漏れ量は、図4に示す装置を用いて行った。
11 接着剤
12 吸水性樹脂
13 1次吸収層
14 2次吸収層
15 繊維基質
16 不織布
17 不織布
18 接着剤
21 アクリル板
22 アクリル板
23 吸水シート構成体
31 架台
32 アクリル板
33 吸収性物品
34 滴下ロート
35 天秤
36 トレイ
Claims (5)
- 吸水性樹脂及び接着剤を含有してなる吸収層が、不織布により該吸収層の上方及び下方から挟持された構造を有する吸水シート構成体であって、繊維基質により前記吸収層が上下に1次吸収層と2次吸収層とに分割されてなる構造を有し、前記吸水性樹脂の含有量が100~600g/m2であり、前記接着剤の含有量が吸水性樹脂の含有量(質量基準)に対して0.05~2.0倍であり、1次吸収層と2次吸収層の吸水性樹脂の合計質量に対する1次吸収層の吸水性樹脂の質量の割合が15%以上50%未満である吸水シート構成体。
- 繊維基質が、レーヨン含有合成繊維不織布及び親水化処理された合成繊維不織布からなる群より選ばれた少なくとも1種である、請求項1に記載の吸水シート構成体。
- 不織布が、レーヨン繊維製不織布、ポリオレフィン繊維製不織布及びポリエステル繊維製不織布からなる群より選ばれた少なくとも1種である、請求項1又は2に記載の吸水シート構成体。
- 接着剤が、エチレン-酢酸ビニル共重合体接着剤、スチレン系エラストマー接着剤、ポリオレフィン系接着剤及びポリエステル系接着剤からなる群より選ばれた少なくとも1種である、請求項1~3のいずれか1項に記載の吸水シート構成体。
- 請求項1~4のいずれか1項に記載の吸水シート構成体が、液体透過性シートと液体不透過性シートの間に挟持されている吸収性物品。
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Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105682624A (zh) * | 2013-07-03 | 2016-06-15 | 瑞德科技控股有限公司. | 吸收复合物、采用该吸收复合物的吸收制品、以及制造该吸收复合物和/或制品的方法、系统和装置 |
JP2017213222A (ja) * | 2016-05-31 | 2017-12-07 | 花王株式会社 | 吸収性物品 |
WO2018155591A1 (ja) | 2017-02-22 | 2018-08-30 | 株式会社日本触媒 | 吸水性シート、長尺状吸水性シートおよび吸収性物品 |
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JPWO2013099634A1 (ja) | 2015-05-07 |
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JP6053694B2 (ja) | 2016-12-27 |
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