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WO2018179957A1 - Feuille pour article absorbant, et article absorbant - Google Patents

Feuille pour article absorbant, et article absorbant Download PDF

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Publication number
WO2018179957A1
WO2018179957A1 PCT/JP2018/005236 JP2018005236W WO2018179957A1 WO 2018179957 A1 WO2018179957 A1 WO 2018179957A1 JP 2018005236 W JP2018005236 W JP 2018005236W WO 2018179957 A1 WO2018179957 A1 WO 2018179957A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
water
sheet
fibers
repellent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/005236
Other languages
English (en)
Japanese (ja)
Inventor
有貴 中畑
恵介 内海
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daiwabo Holdings Co Ltd
Daiwabo Polytec Co Ltd
Original Assignee
Daiwabo Holdings Co Ltd
Daiwabo Polytec Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daiwabo Holdings Co Ltd, Daiwabo Polytec Co Ltd filed Critical Daiwabo Holdings Co Ltd
Priority to JP2018526733A priority Critical patent/JP6366892B1/ja
Priority to TW107105771A priority patent/TW201836564A/zh
Publication of WO2018179957A1 publication Critical patent/WO2018179957A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5412—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sheath-core
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • 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
    • A61F13/537—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 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5418—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/559—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5414—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres side-by-side
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
    • D04H1/5416—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sea-island

Definitions

  • This disclosure relates to an absorbent article sheet and an absorbent article.
  • Nonwoven fabrics having various configurations have been proposed as sheets constituting absorbent articles such as sanitary napkins, disposable diapers, and incontinence pads, that is, sheets for absorbent articles.
  • Patent Document 1 discloses that in an absorbent article in which an intermediate layer is provided between a back sheet and a liquid-permeable top sheet, at least a part of the top sheet is made of hydrophilic fibers and water-repellent fibers. It is proposed to form a liquid-permeable non-woven fabric mixed with.
  • Patent Document 2 discloses an absorbent article having an absorbent body between a water-permeable top sheet and a water-impermeable back sheet, and is disposed on the top sheet side as a second sheet disposed between the top sheet and the absorbent body.
  • the absorbent article generally has a surface sheet, a back sheet, an absorbent body disposed between the surface sheet and the back sheet, and further includes other members as necessary. Depending on the mode in which the absorbent article sheet is used, it may be required to have a higher liquid absorption speed, a higher liquid return prevention property, and a higher liquid retention prevention property.
  • Liquid return means that the liquid that has once passed through the surface sheet exudes to the surface of the surface sheet again.
  • the amount of liquid that exudes to the surface by this liquid return that is, the more the liquid return amount, the more the user I feel more uncomfortable. Therefore, “high liquid return preventing property” means that the liquid return amount is smaller.
  • Liquid holding means that the sheet itself holds the liquid. If the sheet holds more liquid on the surface or inside, the held liquid is likely to ooze out to the surface of the surface sheet due to pressurization or the like, causing liquid return. Therefore, “high liquid retention prevention” means that the sheet has a small ability to hold liquid.
  • the present disclosure is intended to provide a sheet for absorbent articles having a well-balanced liquid absorption rate, liquid return prevention property, and liquid holding prevention property.
  • the present disclosure is a nonwoven fabric including a first fiber layer and a second fiber layer located on one main surface of the first fiber layer,
  • the first fiber layer includes a synthetic fiber containing a water-repellent fiber treatment agent (hereinafter “water-repellent fiber”), and a fiber having a lower water repellency than the water-repellent fiber (hereinafter “first fiber”).
  • water-repellent fiber a synthetic fiber containing a water-repellent fiber treatment agent
  • first fiber a fiber having a lower water repellency than the water-repellent fiber
  • the second fiber layer includes fibers having a lower water repellency than the water-repellent fibers (hereinafter referred to as “second fibers”);
  • the fiber diameter of the water repellent fiber is 23.5 ⁇ m or more and 42 ⁇ m or less,
  • the fiber diameter of the first fiber is smaller than the fiber diameter of the water repellent fiber,
  • the ratio (mass%) of the second fibers contained in the second fiber layer is greater than the percentage (mass%) of the water-repellent fibers contained in the first fiber layer.
  • an absorbent article sheet having a well-balanced liquid absorption rate, liquid return prevention property, and liquid holding prevention property can be obtained. Therefore, when this absorbent article sheet is used as, for example, an intermediate sheet disposed between the top sheet and the absorbent body, the liquid can be moved to the absorbent body more quickly and is being used. The liquid return can be reduced.
  • FIG. 7 It is the electron micrograph which image
  • FIG. 7 It is the electron micrograph which image
  • FIG. It is a schematic diagram explaining the measuring method of a contact angle.
  • the absorbent article sheet is used as an intermediate sheet (also referred to as ADL (Absorption Distribution Layer) or second sheet) disposed between the top sheet and the absorber, the liquid absorption speed, the liquid return prevention property, and the absorber.
  • ADL Absorption Distribution Layer
  • the intermediate sheet is also desired to have a characteristic that allows the liquid to be efficiently absorbed by the absorber.
  • the liquid has a small viscosity like urine (for example, a viscosity of 0.6 mPa ⁇ s to 0.9 mPa ⁇ s) and the amount of excretion per time is relatively large
  • the property of diffusing the liquid that has passed through the sheet is required.
  • the liquid has a large viscosity (for example, a viscosity of 7 mPa ⁇ s to 9 mPa ⁇ s) like menstrual blood and has a color, a colored region that is recognized by the user after being absorbed by the absorber Therefore, the intermediate sheet is required to have the property of suppressing the spread of the liquid and quickly transferring the liquid to the absorber.
  • the concealability (invisibility) of the absorbed liquid is required, and the concealability is higher as the spread of menstrual blood that can be recognized by the eyes is smaller.
  • the present inventors examined the configuration of an intermediate sheet that satisfies these requirements.
  • the present inventors considered that a sheet satisfying these requirements can be obtained by combining fibers having different degrees of water repellency.
  • the desired liquid absorption performance cannot be achieved simply by mixing these fibers, and the liquid absorption performance tends to be lowered particularly when the liquid is absorbed repeatedly.
  • the present inventors have a non-woven fabric having a two-layer structure, one fiber layer (first fiber layer) containing more fibers having a higher degree of water repellency, and the other fiber layer (second fiber layer) having water repellency.
  • a configuration containing more of the lesser fibers was studied.
  • the liquid return amount is reduced, the liquid is diffused in the case of a liquid having a low viscosity, and the liquid is spread in the case of a liquid having a high viscosity. It was found that the liquid can be quickly transferred to the absorber.
  • the fiber diameter of the fibers constituting the second fiber layer when the viscosity of the liquid is small, the diffusion is further promoted, and the liquid return prevention property is also improved.
  • the first fiber layer is configured to include a synthetic fiber (water repellent fiber) containing a water repellent fiber treatment agent, and a fiber (first fiber) having a lower water repellency than the water repellent fiber, -The fiber diameter of the water-repellent fiber should be within a predetermined range, -By making the fiber diameter of the first fiber smaller than the fiber diameter of the water repellent fiber, moderately large inter-fiber voids are formed between the water repellent fibers and between the water repellent fibers and the first fibers, thereby absorbing liquid It has been found that the balance of performance becomes better.
  • the absorbent article sheet of the present embodiment and the absorbent article using the same will be described.
  • the sheet for absorbent articles of the present embodiment is a nonwoven fabric including a first fiber layer and a second fiber layer located on one main surface of the first fiber layer,
  • the first fiber layer includes a water-repellent fiber that is a synthetic fiber containing a water-repellent fiber treatment agent, and a first fiber that is a fiber having a lower water repellency than the water-repellent fiber
  • the second fiber layer includes a second fiber that is a fiber having a lower water repellency than the water-repellent fiber;
  • the fiber diameter of the water repellent fiber is 23.5 ⁇ m or more and 42 ⁇ m or less,
  • the fiber diameter of the first fiber is smaller than the fiber diameter of the water repellent fiber, It is a sheet
  • the water-repellent fiber contained in the first fiber layer is a synthetic fiber containing a water-repellent fiber treatment agent.
  • the synthetic fiber with the water-repellent fiber treatment agent attached to the surface or the water-repellent fiber treatment agent is a fiber. Synthetic fibers dispersed in it. Since the synthetic fiber itself has a certain degree of water repellency, the degree of water repellency can be further increased by further containing a water-repellent fiber treatment agent.
  • the degree of water repellency of the water-repellent fiber can be known from, for example, the contact angle.
  • the contact angle refers to an angle formed by the water surface and the fiber surface at a place where the free surface of water contacts the fiber (takes an angle inside the water).
  • the contact angle of the water-repellent fiber may be, for example, 100 ° to 135 °, particularly 100 ° to 130 °, and more particularly 100 ° to 125 °. .
  • the greater the contact angle the higher the water repellency.
  • the contact angle of the water-repellent fiber is too small, the liquid return preventing property of the nonwoven fabric is lowered.
  • the contact angle is measured by the following method.
  • a measuring unit to which a zoom lens (manufactured by Keyence Corporation, model number: VH-Z100R) is attached to a microscope VHX-1000 manufactured by Keyence Corporation, is fixed in a state where it is tilted horizontally.
  • a non-woven fabric containing fibers that are objects of contact angle measurement is cut so that the length (MD direction) ⁇ width (CD direction) is 50 mm ⁇ 10 mm, and a measurement sample is prepared. With the measurement surface of the measurement sample facing upward, test the measurement sample so that the CD direction of the nonwoven fabric is perpendicular to the lens surface of the zoom lens (that is, the observation direction is parallel to the CD direction). Place it on the table and fix both ends with tape.
  • observation direction (the direction in which the object is viewed through the zoom lens) is not particularly limited as long as the fiber is selected so as to extend in a direction orthogonal to the observation direction.
  • the viewing direction may be a direction that forms an angle of 45 ° with the CD direction of the nonwoven fabric, for example.
  • the contact angle was an angle formed by drawing a tangent line on the water droplet at a position where the surface of the water droplet contacting the air and the fiber contacted, and the tangent line and the fiber.
  • the contact angle is measured by image analysis processing software (for example, two-dimensional image analysis software “MicroMeasure” available from SCARA Co., Ltd.) or a protractor.
  • the contact angle is measured in each of the selected images, and the average value (arithmetic average value) of them is obtained to obtain the contact angle of the fiber to be measured.
  • the contact angle may be measured by a method in which a target constituent fiber is taken out from the measurement surface and water droplets are sprayed on the constituent fiber without measuring using a nonwoven fabric.
  • the “contact angle” is obtained in consideration of the movement situation. Less than 40% of the total number of measurements (total number of measurement points where shooting of water droplets was attempted, total when water droplets moved during shooting and when they did not move) before reaching 20 contact angle measurement points.
  • 10 or more images in which the fibers are horizontal are selected and the measured values are averaged to obtain the contact angle. If the water droplets move at 40% or more of the total number of measurements before the contact angle is measured at 20 points, the contact angle is 20 ° or less.
  • the synthetic fiber containing the water repellent fiber treatment agent is made of a thermoplastic resin.
  • the thermoplastic resin is not particularly limited, and polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate and copolymers thereof; polypropylene, polyethylene (high density polyethylene) , Low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, and propylene copolymers mainly containing propylene (including propylene-ethylene copolymers and propylene-butene-1-ethylene copolymers) ), And polyolefin resins such as ethylene-vinyl acetate copolymer; polyamide resins such as nylon 6, nylon 12 and nylon 66; acrylic resins; polycarbonate, polyacetal, polystyrene and rings Engineering plastics, such as polyolefins, as well as selected arbitrari
  • the synthetic fiber may be a single fiber made of one or a plurality of thermoplastic resins selected from the above. When a single fiber is used, fibrillation and fine powder due to interfacial delamination between components, which are seen when a composite fiber is used, are less likely to occur. More specifically, the synthetic fiber may be a single fiber made of one or more resins selected from the group consisting of the polyolefin resin, the polyester resin, the polyamide resin, and the acrylic resin. In particular, polypropylene single fibers are preferably used because they have high water repellency per se, and polyethylene terephthalate single fibers have a high Young's modulus (compared with polypropylene) and make the nonwoven fabric bulky. Preferably used.
  • the synthetic fiber may be a composite fiber composed of two or more components (also referred to as “sections”). Generally, two or more components are composed of thermoplastic resins having different melting points. In the synthetic fiber, each component may be composed of one thermoplastic resin, or may be a mixture of two or more thermoplastic resins.
  • the composite fiber may be, for example, a core-sheath composite fiber, a sea-island composite fiber, a split composite fiber, or a side-by-side composite fiber.
  • the core-sheath type composite fiber may be an eccentric core-sheath type composite fiber in which the center of the core component does not coincide with the center of the sheath component in the fiber cross section, and the center of the core component coincides with the center of the sheath component in the fiber cross section. It may be a sheath type composite fiber.
  • the synthetic fiber is a composite fiber
  • two or more components may be arranged so that the thermoplastic resin having the lowest melting point constitutes a part of the fiber surface.
  • the low melting point component in the process of producing the nonwoven fabric, if heat is applied under the condition that the component consisting of the thermoplastic resin having the lowest melting point (hereinafter referred to as “low melting point component”) is melted or softened, the low melting point component becomes the adhesive component, and the fiber It contributes to the adhesion to each other or to other members.
  • thermoplastic resins constituting the composite fiber include, for example, combinations of polyolefin resins such as polyethylene / polyethylene terephthalate, polypropylene / polyethylene terephthalate, and propylene copolymer / polyethylene terephthalate, and polyester resins, and polyethylene / polypropylene, A combination of two types of polyolefin-based thermoplastic resins such as propylene copolymer / polypropylene, and a combination of two types of polyester-based resins having different melting points.
  • polyolefin resins such as polyethylene / polyethylene terephthalate, polypropylene / polyethylene terephthalate, and propylene copolymer / polyethylene terephthalate
  • polyester resins and polyethylene / polypropylene
  • polyethylene / polypropylene A combination of two types of polyolefin-based thermoplastic resins such as propylene copolymer / polypropylene, and a combination of two types of
  • thermoplastic resin exemplified as a constituent component of a single fiber or a composite fiber may contain other components as long as it contains 50 mass% or more of the specifically shown thermoplastic resin.
  • the specifically indicated thermoplastic resin may be contained in an amount of 80% by mass or more, may be contained in an amount of 90% by mass or more, or the constituent component is substantially composed of the specifically indicated thermoplastic resin.
  • the term “substantially” is usually used in consideration that various additives are contained in the thermoplastic resin.
  • polyethylene may contain other thermoplastic resins and additives as long as it contains 50% by mass or more of polyethylene. This also applies in the following examples.
  • the core / sheath combination includes, for example, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, and polyethylene terephthalate / propylene. It may be a polymer, polytrimethylene terephthalate / polyethylene, polybutylene terephthalate / polyethylene, polyethylene terephthalate / copolyester (for example, polyethylene terephthalate copolymerized with isophthalic acid).
  • the core-sheath type composite fiber whose sheath is polyethylene (for example, high density polyethylene, low density polyethylene, or linear low density polyethylene) or copolymer polyester is heat-treated at a temperature equal to or higher than the melting point of the thermoplastic resin constituting the sheath. By doing so, the sheath melts or softens and has a property of bonding the fibers together.
  • polyethylene for example, high density polyethylene, low density polyethylene, or linear low density polyethylene
  • copolymer polyester is heat-treated at a temperature equal to or higher than the melting point of the thermoplastic resin constituting the sheath.
  • the composite ratio (mass ratio, core / sheath) of the core and the sheath may be, for example, 80/20 to 20/80, particularly 60/40 to 40/60. It may be.
  • the water-repellent fiber may be one in which a component constituting the water-repellent fiber does not function as a component that bonds the fibers (that is, an adhesive component). More specifically, the water repellent fiber may be one in which a component constituting the water repellent fiber does not function as an adhesive component by melting or softening due to the action of heat, for example. Whether or not the component constituting the water-repellent fiber functions as an adhesive component depends on the type of the thermoplastic resin constituting the water-repellent fiber and the production conditions of the nonwoven fabric. When the component constituting the water-repellent fiber does not function as an adhesive component, the number of adhesion points in the nonwoven fabric can be reduced, and the tactile feel of the nonwoven fabric becomes better.
  • the adhesion point provides a hard tactile sensation and a tingling sensation
  • the smaller the amount the softer the tactile sensation of the nonwoven fabric.
  • the water-repellent fiber has a larger fiber diameter as will be described later, when the component constituting the water-repellent fiber functions as an adhesive component, an adhesive point having a large area or volume is formed, thereby reducing the touch of the nonwoven fabric. Sometimes.
  • the component of the first fiber functions as an adhesive component and the melting point of the adhesive component is 100 ° C. or higher and 140 ° C. or lower
  • the component constituting the water-repellent fiber particularly the repellent property.
  • the melting point of the component constituting the surface of the aqueous fiber may be, for example, 145 ° C. or higher and 270 ° C. or lower, particularly 147 ° C. or higher and 250 ° C. or lower, and more particularly 150 ° C. or higher and 220 ° C. or lower.
  • any value specifically shown as the melting point of the thermoplastic resin is the melting point after spinning unless otherwise specified.
  • the melting point after spinning was increased from room temperature to 300 ° C. at a heating rate of 10 ° C./min using a differential scanning calorimeter (manufactured by Seiko Instruments Inc.) with a fiber amount (sample amount) of 5.0 mg.
  • the fiber can be melted by heating, and can be obtained from the obtained heat of fusion curve.
  • the content of the water repellent fiber treatment agent is not particularly limited.
  • the water-repellent fiber treatment agent may adhere to the surface of the synthetic fiber or may be dispersed in the fiber.
  • the water-repellent fiber treatment agent can be attached to the surface of the synthetic fiber by spraying the surface of the synthetic fiber with a spray or the like, or by applying it to the surface of the synthetic fiber by any method.
  • the water-repellent fiber treatment agent can be dispersed in the fiber by melt spinning the thermoplastic resin kneaded with the water-repellent fiber treatment agent.
  • the type of the water repellent fiber treatment agent is not particularly limited.
  • the water repellent fiber treatment agent may be a known one.
  • the water-repellent fiber treatment agent includes, for example, an alkali metal salt, an alkaline earth metal salt, an ammonium salt, or an amine salt of an alkyl phosphate having an alkyl group having an average carbon number of 14 or more, preferably 16 to 22 carbon atoms.
  • Fiber treatment agents fiber treatment agents containing carboxy-modified polyethylene wax having a molecular weight of 1000 to 10,000 and an acid value of 5 to 50, water-soluble fluorine-based surfactants such as perfluoroalkylcarboxylates and perfluoroalkyltrimethylammonium salts, Oil-soluble fluorosurfactants such as perfluoroalkyl-containing oligomers, perfluoroalkylethylene oxide adducts, fluorine-containing fiber treatment agents containing water- and oil-repellent finishing agents polymerized with fluorine-containing vinyl monomers, polydimethylsiloxane, methylhydrogen Polysiloxane, amino modification , Epoxy-modified, carboxyl-modified, quaternary ammonium salt-modified, higher alkyl-modified, fluorine-modified and other modified silicones, and silicone-containing fiber treatment agents containing silicone-based surfactants in which silicone and hydrophilic groups are bonded, and also known Hydrophobizing
  • the content of the water repellent fiber treatment agent may be 0.1% by mass or more and 2.0% by mass or less when the fiber mass (the mass of the fiber excluding the fiber treatment agent) is 100% by mass.
  • the content of the water-repellent fiber treatment agent may be particularly 0.15% by mass or more and 1.0% by mass or less, and more particularly 0.2% by mass or more and 0.6% by mass or less.
  • the water-repellent fiber has a fiber diameter of 23.5 ⁇ m or more and 42 ⁇ m or less.
  • a relatively wide interfiber gap can be formed in the first fiber layer.
  • a wide inter-fiber gap in particular, a wide gap formed by a water-repellent fiber and another fiber, and a wide gap formed between the water-repellent fibers, it is difficult to hold the liquid. Therefore, the use of the water-repellent fiber having the fiber diameter within the predetermined range facilitates improving the liquid wetting prevention property of the nonwoven fabric.
  • the fiber diameter of the water-repellent fiber may be 26.5 ⁇ m or more and 37.6 ⁇ m or less, and more particularly 28.0 ⁇ m or more and 33.6 ⁇ m or less.
  • the fiber diameter of the water repellent fiber may be 30.8 ⁇ m or more and 41.3 ⁇ m or less.
  • the fiber diameter is a method of measuring the fiber diameter of an arbitrary 100 fibers by using a scanning electron microscope (SEM, magnification 50 to 500 times), observing the fiber side surface, and calculating an average value thereof. Ask for.
  • SEM scanning electron microscope
  • the fiber cross section is observed with a scanning electron microscope (magnification 50 to 500 times), and a straight line connecting any two points on the outer periphery of the fiber Of these, the fiber diameter is the one having the maximum length.
  • the method for obtaining the fiber diameter of the other fibers is the same as the method for obtaining the fiber diameter described herein.
  • the fiber length of the water-repellent fiber is not particularly limited, and may be appropriately selected according to the method for producing the nonwoven fabric.
  • the water-repellent fiber may be a short fiber.
  • the fiber length may be, for example, 20 mm or more and 80 mm or less, particularly 28 mm or more and 75 mm or less, and more particularly 30 mm or more and 65 mm or less.
  • the first fiber is a fiber having a lower water repellency than the water-repellent fiber.
  • the degree of water repellency can be known from, for example, the contact angle.
  • the first fiber has a smaller contact angle than the contact angle of the water-repellent fiber.
  • the contact angle of the first fibers may be, for example, 30 ° to 75 °, particularly 35 ° to 70 °, and more particularly 40 ° to 65 °. Further, the contact angle of the first fiber may be 35 ° or more smaller than that of the water-repellent fiber, preferably 40 ° or smaller, and more preferably 45 ° or smaller. It's okay. If the difference in the contact angle between the water-repellent fiber and the first fiber is small, it is difficult to obtain the effect (improved balance of liquid absorption performance) by using two types of fibers.
  • the first fiber may be a synthetic fiber containing a hydrophilic fiber treating agent, for example.
  • a hydrophilic fiber treating agent for example.
  • the thermoplastic resin constituting the synthetic fiber is as described above in relation to the water-repellent fiber.
  • the synthetic fiber containing the hydrophilic fiber treating agent may be a single fiber or a composite fiber, and examples thereof are as described above in relation to the water-repellent fiber.
  • the component having the lowest melting point constitutes at least a part of the fiber surface, and the melting point of the low melting point component is the water repellent fiber. It may be lower than the melting point of the component constituting at least the surface.
  • the first fiber layer is obtained by melting or softening the low melting point component of the first fiber, for example, by heating, without causing the component constituting the water-repellent fiber to function as an adhesive component. Can be bonded to each other.
  • the low melting point component of the first fiber functions as an adhesive component, the area or volume of the adhesion point can be reduced because the fiber diameter is smaller than that of the water-repellent fiber as described later.
  • the non-woven fabric is less likely to feel harder and has a tingling feeling compared to the case where the constituent component of the thick water-repellent fiber is the adhesive component. Since it is difficult, the touch of a nonwoven fabric can be made more favorable.
  • the melting point of the low melting point component of the first fiber may be 5 ° C. or more lower than the melting point of the component constituting at least the surface of the water repellent fiber, particularly 7 ° C. or more, and more particularly 10 ° C. or more lower. It may be even lower, more particularly 20 ° C. or lower.
  • the melting point difference is small, when the low melting point component functions as an adhesive component by heating, for example, the water repellent fiber component may also melt or soften to function as the adhesive component.
  • the melting point of the low melting point component of the first fiber may be, for example, 100 ° C. or more and 150 ° C. or less, particularly 100 ° C. or more and 145 ° C. or less, more particularly 100 ° C. or more and 140 ° C. or less. Good.
  • the low melting point component of the first fiber may be, for example, polyethylene, more specifically, high density polyethylene, low density polyethylene, or linear low density polyethylene.
  • Polyethylene has a relatively low melting point and exhibits adhesiveness when heated at a relatively low temperature. Therefore, if the low melting point component of the first fiber is polyethylene, the component constituting at least the surface of the water repellent fiber can be selected from more thermoplastic resins.
  • the resin combined with polyethylene is not particularly limited as long as the resin has a higher melting point than polyethylene, and examples thereof include polypropylene, polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate.
  • the fibers constituting at least a part of the fiber surface of polyethylene include, specifically, a core-sheath type composite fiber in which polyethylene is a sheath component, a sea-island type composite fiber having polyethylene as a sea part, and a split type having polyethylene as one component
  • a core-sheath type composite fiber in which polyethylene is a sheath component a sea-island type composite fiber having polyethylene as a sea part
  • a split type having polyethylene as one component examples include composite fibers and side-by-side composite fibers containing polyethylene as one component.
  • the composite ratio (mass ratio, low melting point component / other component) of the low melting point component and other components is 80/20 to 65/35, particularly 60 / 40 to 50/50.
  • the ratio of the low melting point component is small, the adhesion between the fibers may be insufficient.
  • the form of the hydrophilic fiber treatment agent is not particularly limited.
  • the hydrophilic fiber treatment agent may be attached to the surface of the synthetic fiber or may be dispersed in the fiber.
  • the hydrophilic fiber treating agent can be attached to the surface of the synthetic fiber by spraying the surface of the synthetic fiber with a spray or the like, or by applying it to the surface of the synthetic fiber by any method. By melt spinning the thermoplastic resin kneaded with the hydrophilic fiber treatment agent, the hydrophilic fiber treatment agent can be dispersed in the fiber.
  • the type of hydrophilic fiber treatment agent is not particularly limited.
  • the hydrophilic fiber treating agent may be a known one.
  • the fiber processing agent containing surfactant is mentioned, for example.
  • the surfactant anionic, cationic, zwitterionic and nonionic surfactants can be used.
  • anionic surfactants examples include alkyl phosphate sodium salt, alkyl ether phosphate sodium salt, dialkyl phosphate sodium salt, dialkyl sulfosuccinate sodium salt, alkylbenzene sulfonate sodium salt, alkyl sulfonate sodium salt, and alkyl sulfate sodium salt. Can do.
  • any alkyl preferably has 6 to 22 carbon atoms.
  • other alkali metal salts such as potassium salts and alkaline earth metal salts (for example, magnesium salts) can be used instead of sodium salts.
  • Examples of the cationic surfactant include alkyl (or alkenyl) trimethyl ammonium halide, dialkyl (or alkenyl) dimethyl ammonium halide, alkyl (or alkenyl) pyridinium halide, and the like.
  • the cationic surfactant preferably has an alkyl group or alkenyl group having 6 to 18 carbon atoms.
  • Examples of the halogen in the halide compound include chlorine and bromine.
  • Examples of the zwitterionic surfactant include betaine-type amphoteric surfactants such as alkyldimethylbetaine, amino acid-type amphoteric surfactants, and aminosulfonic acid-type amphoteric surfactants.
  • examples of nonionic surfactants include polyhydric alcohol fatty acid esters such as glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, alkylene oxide adducts of polyhydric alcohol fatty acid esters, polyoxyalkylene-modified silicones, amino-modified Examples include silicone.
  • the content of the hydrophilic fiber treatment agent may be 0.1% by mass or more and 2.0% by mass or less when the fiber mass (the mass of the fiber excluding the fiber treatment agent) is 100% by mass.
  • the content of the hydrophilic fiber treating agent may be particularly 0.15% by mass or more and 1.0% by mass or less, and more particularly 0.2% by mass or more and 0.6% by mass or less.
  • the first fiber has a lower water repellency than that of the water-repellent fiber
  • natural fibers such as cotton, silk, wool, hemp, and pulp, and rayon and polynosic obtained by the viscose method, copper Semi-synthesis of cupra obtained by the ammonia method, cellulose fibers obtained by the solvent spinning method (Lentzing Griyocel (registered trademark) and Tencel (registered trademark), etc.), cellulose fibers obtained by the melt spinning method, and acetate fibers.
  • It may be one or more fibers selected from hydrophilic fibers such as fibers.
  • These fibers may contain a hydrophilic fiber treatment agent or a water repellent fiber treatment agent as long as the degree of water repellency is lower than that of the water repellent fiber.
  • the first fiber has a fiber diameter smaller than that of the water repellent fiber.
  • the fiber diameter of the first fiber may be, for example, 9.5 ⁇ m or more and 29.6 ⁇ m or less, particularly 11.1 ⁇ m or more and 26 ⁇ m or less, and more particularly 12.1 ⁇ m or more and 23.5 ⁇ m or less. .
  • the fiber length of the first fiber is not particularly limited, and may be appropriately selected according to the method for manufacturing the nonwoven fabric.
  • a 1st fiber may be a short fiber.
  • the fiber length may be, for example, 20 mm or more and 80 mm or less, particularly 28 mm or more and 75 mm or less, and more particularly 30 mm or more and 65 mm or less.
  • the second fiber contained in the second fiber layer is a fiber having a lower water repellency than the water repellent fiber.
  • the contact angle of the second fiber may be, for example, 30 ° or more and 75 ° or less, particularly 35 ° or more and 70 ° or less, more particularly 40 ° or more and 65 ° or less, similar to that of the first fiber. Good.
  • the contact angle of the second fiber may be 35 ° or more smaller than that of the water repellent fiber, preferably 40 ° or less, and more preferably 45 ° or less. It's okay.
  • the second fiber layer has a low degree of water repellency, when it is contained in the second fiber layer, the liquid drawn into the first fiber layer can be strongly drawn into the second fiber layer. Drain the liquid immediately. When the difference between the contact angle of the water repellent fiber and the contact angle of the second fiber is small, it becomes difficult to draw the liquid in the second fiber layer.
  • the second fiber may be a synthetic fiber containing a hydrophilic fiber treating agent, for example.
  • a hydrophilic fiber treating agent for example.
  • the thermoplastic resin constituting the synthetic fiber is as described above in relation to the water-repellent fiber.
  • the synthetic fiber containing the hydrophilic fiber treating agent may be a single fiber or a composite fiber, and examples thereof are as described above in relation to the water-repellent fiber.
  • the component having the lowest melting point constitutes at least a part of the fiber surface
  • the melting point of the low melting point component constitutes at least the surface of the water repellent fiber. It may be lower than the melting point of the component.
  • the component of the water repellent fiber does not function as an adhesive component
  • the low melting point component can be melted or softened, for example, by heating.
  • the low melting-point component of a 2nd fiber can be functioned as an adhesive component which adhere
  • an adhesive point having a large area or volume is not formed, and the adhesive point can be reduced. The touch of the nonwoven fabric becomes softer.
  • the specific configuration of the composite fiber in which the low melting point component constitutes at least part of the fiber surface, and the melting point of the low melting point component is lower than the melting point of the component constituting at least the surface of the water repellent fiber is related to the first fiber As described above. Therefore, detailed description thereof is omitted here.
  • the form of the hydrophilic fiber treatment agent is not particularly limited.
  • the example of the containing form of a hydrophilic fiber processing agent is as having demonstrated regarding the 1st fiber. Therefore, detailed description thereof is omitted here.
  • hydrophilic fiber treatment agent is not particularly limited. Examples of the hydrophilic fiber treatment agent and the content of the hydrophilic treatment agent are as described in relation to the first fiber. Therefore, detailed description thereof is omitted here.
  • the second fiber may be a fiber other than the synthetic fiber as long as the degree of water repellency is lower than that of the water repellent fiber.
  • fibers other than synthetic fibers are as described in connection with the first fibers. Therefore, detailed description thereof is omitted here.
  • the fiber diameter of the second fiber is not particularly limited.
  • the fiber diameter of the second fiber may be larger or smaller than the fiber diameter of the water repellent fiber.
  • the fiber diameter of the second fiber may be the same as the fiber diameter of the water repellent fiber.
  • the fiber diameter of the second fiber may be larger or smaller than the fiber diameter of the first fiber.
  • the fiber diameter of the second fiber may be the same as the fiber diameter of the first fiber.
  • the liquid return preventing property is further improved.
  • the fiber diameter of the second fiber having a small degree of water repellency is small, the fine void formed by the second fiber functions as a capillary, so that a liquid having a low viscosity is more easily diffused in the second fiber layer.
  • a liquid with a high viscosity is difficult to diffuse in the second fiber layer, which rather improves the concealability in an article that absorbs a colored viscous liquid such as menstrual blood. .
  • the fiber diameter of the second fiber may be, for example, 9.5 ⁇ m or more and 29.6 ⁇ m or less, particularly 11.1 ⁇ m or more and 26 ⁇ m or less, and more particularly 12.1 ⁇ m or more and 23.5 ⁇ m or less. .
  • the fiber diameter of the second fibers is preferably 21.0 ⁇ m or less. If the fiber diameter of the second fiber is too large, the inter-fiber gap becomes large and the area where the liquid comes into contact with the fiber decreases, and coupled with the high viscosity of the liquid, it becomes difficult for the liquid to migrate to the absorber. As a result, liquid tends to remain on the non-woven fabric, and the concealability tends to decrease.
  • the fiber length of the second fiber is not particularly limited. Similar to the first fiber, the second fiber may be a short fiber.
  • the example of the specific fiber length in case the 2nd fiber is a short fiber is as having demonstrated in relation to the 1st fiber. Therefore, detailed description thereof is omitted here.
  • the absorbent article sheet of the present embodiment is a nonwoven fabric in which a second fiber layer containing second fibers is located on one main surface of a first fiber layer containing water-repellent fibers and first fibers, It is a nonwoven fabric in which the proportion (mass%) of the second fibers contained in the two-fiber layer is larger than the proportion (mass%) of the water-repellent fibers contained in the first fiber layer.
  • the liquid is first drawn into the containing first fiber layer, and then the second fiber layer strongly draws the liquid.
  • the second fiber layer is pulled in while diffusing the liquid, and when the viscosity of the liquid is large, the second fiber layer is pulled in without spreading the liquid. That is, a two-stage drawing force acts on the liquid in contact with the nonwoven fabric, and the liquid passes from the surface of the first fiber layer through the first fiber layer, through the second fiber layer, and further to the second fiber. It will be moved to another member located below the layer.
  • the first fiber layer and the second fiber layer will be described first.
  • the first fiber layer includes water-repellent fibers and first fibers.
  • the proportion of the water-repellent fibers in the first fiber layer may be, for example, 5% by mass or more and 50% by mass or less, particularly 10% by mass or more and 50% by mass or less, and more particularly 20% by mass or more and 45% by mass or less. It may be less than mass%. If the ratio of the water-repellent fiber is too small, the effect (particularly, liquid retention prevention property) due to the inclusion of the water-repellent fiber may not be obtained. If it is too large, the entire first fiber layer will repel the liquid, It may be difficult to pass along the thickness direction of the nonwoven fabric.
  • the proportion of the first fibers in the first fiber layer may be, for example, 50% by mass to 95% by mass, particularly 50% by mass to 90% by mass, and more particularly 55% by mass to 80% by mass. It may be less than mass%. If the ratio of the first fibers is too small, the effect of including the first fibers (particularly the effect of drawing in the liquid and improving the liquid absorption speed) may not be obtained. It may become small and the effect by including a water-repellent fiber may not be acquired.
  • the first fiber layer may contain two or more types of water repellent fibers.
  • the first fiber layer may include two or more types of water-repellent fibers having different degrees of water repellency and / or fiber diameter.
  • the first fiber is selected to have a lower water repellency than a water-repellent fiber having a lower water repellency.
  • each water repellent fiber is selected so that the fiber diameter is within the predetermined range.
  • the first fiber layer may include two or more types of first fibers having different water repellency and / or fiber diameters.
  • the first fiber layer may be composed of two or more layers having different fiber types and / or mixing ratios.
  • the first fiber layer may contain water-repellent fibers and fibers other than the first fibers.
  • the other fibers are, for example, fibers having the same water repellency as that of the water repellant fiber but having a fiber diameter not within the predetermined range, and fibers having a water repellency lower than that of the water repellent fiber.
  • the fiber diameter is larger than that of the water-repellent fiber.
  • the proportion of the other fibers in the first fiber layer may be, for example, 30% by mass or less, particularly 20% by mass or less, and more particularly 10% by mass or less. It's okay.
  • the second fiber layer includes second fibers.
  • the second fibers are included in the second fiber layer at a ratio (%) that is greater than the ratio (% by mass) of the water-repellent fibers in the first fiber layer.
  • the proportion of the second fibers may be, for example, 50% by mass or more, particularly 80% by mass or more, and more particularly 95% by mass or more.
  • the 2nd fiber layer may consist only of 2nd fiber.
  • the second fiber layer may include two or more types of second fibers having different degrees of water repellency and / or fiber diameter.
  • the second fiber layer may be composed of two or more layers each including fibers having different water repellency and / or fiber diameter.
  • the second fiber may be a fiber made of the same fiber as the first fiber or a combination of the same thermoplastic resins.
  • the adhesive component is common.
  • the degree of adhesion can be the same between the first fiber layer and the second fiber layer, and a more uniform nonwoven fabric can be obtained.
  • the other fibers may be the water-repellent fibers described in relation to the first fiber layer.
  • the ratio of the water-repellent fibers may be, for example, 15% by mass or less, particularly 10% by mass or less, and more particularly 5% by mass or less. Good.
  • the water-repellent fibers may be the same as or different from those contained in the first fiber layer.
  • the other fibers included in the second fiber layer have a greater degree of water repellency than the second fibers, and the fiber diameter is smaller or larger than the fiber diameter of the water-repellent fibers included in the first fiber layer. There may be.
  • the nonwoven fabric of this embodiment is a laminated nonwoven fabric laminated so that the second fiber layer is located on one main surface of the first fiber layer.
  • the nonwoven fabric of this embodiment may have a two-layer structure consisting of only the first fiber layer and the second fiber layer. Or the nonwoven fabric of this embodiment is the 3 or more layers which laminated
  • a laminated nonwoven fabric having The other fiber layer may be, for example, a fiber layer made of only the first fiber, or a fiber layer made of only the second fiber, or the first and second fiber layers included in the first and second fiber layers.
  • the fiber layer may include a fiber having a water repellency lower than that of the water repellent fiber, which is different from the second fiber.
  • the mode of integration of the fibers is not particularly limited.
  • the fibers may be entangled and integrated by an entanglement method using a high-pressure fluid flow or a needle punch method, or may be integrated by bonding the fibers together.
  • Adhesion between fibers may be realized by causing at least one component of at least one kind of fibers constituting the nonwoven fabric to function as an adhesive component, or may be realized by applying a binder (adhesive).
  • the fibers may be bonded together by a component constituting the first fiber and a component constituting the second fiber.
  • attachment can be implemented by melting or softening the component which comprises a 1st fiber, and the component which comprises a 2nd fiber by heating.
  • attachment by the component which comprises a 1st fiber, and the component which comprises a 2nd fiber by irradiation, such as an electron beam, or ultrasonic welding.
  • the first fiber layer is formed by using a fiber that includes two or more components as the first fiber and in which the component having the lowest melting point (low melting point component) forms part of the fiber surface. It is preferable to bond the fibers together with a low melting point component.
  • the fiber which comprises a 2nd fiber layer is used using the fiber which contains two or more components, and the component (low melting-point component) with the lowest melting
  • the low melting point component of the first and second fibers functions as an adhesive component by heating, if the melting point of the low melting point component of the first and second fibers is lower than the melting point of the component constituting at least the surface of the water repellent fiber,
  • the water repellent fiber does not function as a component that bonds the fibers together. That is, the water-repellent fiber is present in the first fiber layer while maintaining the fiber form without being melted or softened by heating.
  • the water-repellent fiber is not melted or softened and does not function as an adhesive component, the number of adhesion points in the nonwoven fabric can be reduced, and an adhesion point having a large area or volume is not formed. Tactile feeling can be improved.
  • the first fiber layer and the second fiber layer may be integrated as a whole, or may be partially joined and integrated.
  • the integration of the first fiber layer and the second fiber layer as a whole is performed by stacking the first fiber web to be the first fiber layer and the second fiber web to be the second fiber layer, as will be described later. It can be realized by producing a fiber web and subjecting this laminated fiber web to an entanglement process (for example, an entanglement process by a high-pressure fluid flow) or an adhesion process (for example, a thermal bonding process).
  • the partial joining of the first fiber layer and the second fiber layer can be realized by, for example, an adhesive, sewing, entanglement, or thermocompression bonding.
  • the first fiber layer and the second fiber layer are not joined as long as the nonwoven fabric of the present embodiment is provided in a form in which the second fiber layer is located on one main surface of the first fiber layer, They may simply be superimposed.
  • the basis weight of the nonwoven fabric of the present embodiment is not particularly limited, and is appropriately selected according to its use.
  • the basis weight of the nonwoven fabric of the present embodiment may be, for example, 10 g / m 2 or more and 80 g / m 2 , particularly 12 g / m 2 to 70 g / m 2 , more particularly 18 g / m 2 to 60 g / m 2. m 2 . If the non-woven fabric is too small, the non-woven fabric may be easily torn, twisted, or damaged. If it is too large, the anti-wetting property may decrease (hold more liquid), or Breathability may be reduced.
  • the basis weights of the first fiber layer and the second fiber layer are appropriately selected so that the basis weight of the entire nonwoven fabric is desired.
  • the basis weight of the two fiber layers is that the ratio of the first fiber layer to the second fiber layer is 80 : 20 to 20:80, particularly 70:30 to 30:70. If the ratio of the basis weight of the first fiber layer is too small, the force with which the first fiber layer draws liquid may be reduced, or the second fiber layer may retain more liquid and the liquid return prevention property may be reduced. Sometimes. Moreover, when the ratio of the fabric weight of a 2nd fiber layer is too small, the force in which a 2nd fiber layer draws in the liquid from a 1st fiber layer may fall.
  • the basis weight of the first fiber layer may be, for example, 10 g / m 2 to 40 g / m 2 , particularly 15 g / m 2 to 35 g / m 2 , more particularly 20 g / m 2 to 30 g / m 2
  • the basis weight of the second fiber layer may be, for example, 10 g / m 2 to 40 g / m 2 , in particular 15 g / m 2. It may be 2 to 35 g / m 2 , more particularly 20 g / m 2 to 30 g / m 2 .
  • the specific volume of the nonwoven fabric of this embodiment is not specifically limited, It selects suitably according to the use etc.
  • the specific volume of the nonwoven fabric of the present embodiment may be, for example, 8 cm 3 / g to 80 cm 3 / g, particularly 10 cm 3 / g to 75 cm 3 / g, and more particularly 20 cm 3 / g to 65 cm. It may be 3 / g.
  • the specific volume can be determined from the basis weight and thickness of the nonwoven fabric, and here, the thickness of the nonwoven fabric is measured with a load of 2.94 cN applied per 1 cm 2 of the sample. As the specific volume of the nonwoven fabric is larger, the breathability and cushioning properties of the nonwoven fabric tend to be improved. However, when the nonwoven fabric is too large, the liquid retention prevention property may be lowered and the liquid return prevention property may be lowered.
  • the nonwoven fabric of this embodiment is, for example, Mixing a water repellent fiber and a first fiber to produce a first fiber web; Producing a second fiber web comprising second fibers; Laminating a first fiber web and a second fiber web to produce a laminated fiber web;
  • the laminated fiber web can be manufactured by a manufacturing method including subjecting the fibers to a process for integrating the fibers.
  • the first fiber web and the second fiber web can be produced by a known method.
  • the form of each fiber web may be, for example, a card web such as a parallel web, a cross web, a semi-random web, and a random web.
  • the form of the first fiber web and the second fiber web may be different from each other.
  • the first fiber web and the second fiber web are overlapped to form a laminated fiber web.
  • the laminated fiber web is subjected to a treatment for integrating the fibers.
  • the process for integrating the fibers may be a process for integrating the fibers by entanglement, for example, an entanglement process using a high-pressure fluid or a needle punch process, or a thermal bonding process or an adhesive process. Or the like.
  • the nonwoven fabric of the present embodiment may be bonded by the component constituting the first fiber and the component constituting the second fiber.
  • the laminated fiber web is preferably subjected to a heat treatment.
  • the component constituting the first fiber for example, the low melting point component of the composite fiber
  • the component constituting the second fiber for example, the low melting point component of the composite fiber
  • the heat treatment is, for example, hot air processing for blowing hot air, hot roll processing (hot embossing roll processing), or heat treatment using infrared rays.
  • the nonwoven fabric of this embodiment is preferably manufactured by performing hot air processing. According to the hot air processing, a decrease in specific volume can be relatively suppressed.
  • the heat treatment temperature (for example, the temperature of the hot air) is a component that constitutes the first fiber and the component that constitutes the second fiber, and among those that function as an adhesive component, the temperature at which the component having the highest melting point is softened or melted Good.
  • the heat treatment temperature may be a temperature equal to or higher than the melting point of the component.
  • the heat treatment temperature is preferably set to a temperature at which components constituting at least the surface of the water-repellent fiber do not melt or soften. This is because the component constituting at least the surface of the water-repellent fiber does not function as an adhesive component.
  • the heat treatment temperature may be 130 ° C. to 150 ° C.
  • seat for absorbent articles of this embodiment can be used as a member which comprises an absorbent article.
  • the absorbent article sheet of the present embodiment is a surface sheet (also referred to as a top sheet) of the absorbent article, an intermediate sheet, a sheet that covers the absorbent core (also referred to as an SAP sheet or a core wrap sheet), It can be used as a member constituting a back sheet or the like.
  • the absorbent article sheet of the present embodiment is an intermediate in that excretory body fluids such as urine and menstrual blood absorbed from the topsheet can be quickly transferred to the absorber, and liquid return from the absorber can be prevented. It is preferable to use it for a sheet.
  • Absorbent articles include, for example, disposable diapers (including infants and nursing care), sanitary napkins, puerperal pads, incontinence pads, etc., but absorbent articles are not limited to these,
  • seat for absorbent articles of this embodiment can be used for the arbitrary articles
  • the absorbent article sheet of the present embodiment when used as a top sheet or an intermediate sheet, the absorbent article sheet is arranged such that the first fiber layer thereof is disposed on the side close to the user's skin. It is preferable to be used for.
  • the surface sheet or the intermediate sheet needs to quickly transfer excretory fluid (liquid) to the absorber.
  • it is preferable to dispose the first fiber layer on the skin side which includes water-repellent fibers and contributes to the improvement of liquid retention prevention.
  • the absorbent article of the present embodiment includes a top sheet, a back sheet, an absorbent body disposed between the top sheet and the back sheet, and an intermediate sheet disposed between the top sheet and the absorbent body.
  • An absorbent article having an intermediate sheet which is the absorbent article sheet according to the embodiment described above.
  • the top sheet is a liquid-permeable non-woven fabric or an apertured film, and has a role of capturing excretory fluid and quickly moving the captured excretory fluid to the absorber side.
  • the top sheet when the absorbent article sheet of the previous embodiment is used as an intermediate sheet, the top sheet is made of fibers having a fiber diameter smaller than the fiber diameter of the water-repellent fibers contained in the intermediate sheet (for convenience). (Referred to as “small-diameter fibers”).
  • small-diameter fibers By combining with such a surface sheet, the combination of the surface sheet and the intermediate sheet has a fiber diameter gradient, and the liquid can be easily transferred from the surface sheet to the intermediate sheet.
  • the small diameter fiber may have, for example, a fiber diameter smaller than the fiber diameter of the water-repellent fiber by 5.0 ⁇ m or more, especially 7.0 ⁇ m or more, more particularly 10.0 ⁇ m or more.
  • the difference in fiber diameter between the small-diameter fiber and the water-repellent fiber may be, for example, 20.0 ⁇ m or less, particularly 17.0 ⁇ m or less, and more particularly 15.0 ⁇ m or less. Two or more fibers having different fiber diameters may be included as the small diameter fibers.
  • the top sheet may further include a fiber having a fiber diameter smaller than that of the first fiber included in the intermediate sheet (referred to as a “small diameter fiber” for convenience) in addition to the small diameter fiber.
  • a fiber diameter smaller than that of the first fiber included in the intermediate sheet referred to as a “small diameter fiber” for convenience
  • the small-diameter fiber may have, for example, a fiber diameter that is 0.5 ⁇ m or more smaller than that of the first fiber, particularly a fiber diameter that is 2.0 ⁇ m or smaller, more particularly a fiber diameter that is 4.0 ⁇ m or smaller.
  • the difference in the fiber diameter between the fine fiber and the first fiber may be, for example, 12.0 ⁇ m or less, particularly 9.0 ⁇ m or less, and more particularly 6.0 ⁇ m or less. Two or more fibers having different fiber diameters may be included as the fine fiber.
  • the small-diameter fibers may be contained in the nonwoven fabric constituting the surface sheet, for example, 10% by mass or more, particularly 20% by mass or more, more particularly 30% by mass or more.
  • the small-diameter fibers may be contained in the nonwoven fabric constituting the surface sheet, for example, 100% by mass or less, particularly 90% by mass or less, more particularly 80% by mass or less, and even more particularly 70% by mass or less.
  • the fine fiber may be contained in the nonwoven fabric constituting the surface sheet, for example, 10% by mass or more, particularly 20% by mass or more, and more particularly 30% by mass or more.
  • the fine fiber may be contained in the nonwoven fabric constituting the surface sheet, for example, 90% by mass or less, particularly 80% by mass or less, more particularly 70% by mass or less.
  • the nonwoven fabric constituting the surface sheet may contain fibers having a fiber diameter larger than that of the small diameter fibers, and the ratio thereof may be, for example, 20% by mass or less.
  • the mixing ratio thereof is not particularly limited. For example, you may select the ratio of each fiber so that the content may become large, so that a fiber diameter is large. Alternatively, all fibers may be mixed in the same proportion.
  • the mixing ratio is a mass ratio (small-diameter from the viewpoint of ensuring both good transferability of the liquid to the intermediate sheet and good tactile feel of the topsheet. Fiber: fine fiber), for example 20:80 to 80:20, in particular 30:70 to 70:30.
  • the small diameter fiber and the small diameter fiber may have a lower water repellency than the water repellent fiber.
  • Examples of such fibers are as described in connection with the first fibers contained in the intermediate sheet.
  • fibers containing hydrophilic fiber treatment agents having different water resistance may be mixed. By mixing fibers containing hydrophilic fiber treatment agents having different water resistance, it is possible to suppress a decrease in liquid absorption speed during repeated liquid absorption while reducing liquid retention or liquid return in the top sheet.
  • the hydrophilic fiber treatment agent contained in the fiber having a larger fiber diameter has a fiber diameter of It may exhibit higher water resistance than that contained in smaller fibers. Since the fiber having a smaller fiber diameter is a fiber having a larger specific surface area, it tends to contain more fiber treatment agent than a fiber having a larger fiber diameter. Therefore, the variation in the content of the fiber treatment agent contained therein increases due to the variation in the mixing amount of fibers having a smaller fiber diameter.
  • the hydrophilic fiber treatment agent having lower water resistance is likely to fall off, if such a difference is provided in the water resistance of the hydrophilic fiber treatment agent between the two fibers, the fiber having a smaller fiber diameter is used. From which the hydrophilic fiber treatment agent is preferentially dropped. Therefore, when such a difference is provided in the water resistance of the hydrophilic fiber treatment agent between the two fibers, the amount of the hydrophilic fiber treatment agent falling off while the liquid is passing through the top sheet is adjusted to allow the fiber to pass through. It is also possible to increase the water repellency of the surface sheet after the liquid. Thereby, the liquid holding
  • the intermediate sheet quickly transfers the excretory fluid absorbed from the topsheet to the absorber so that the excretory fluid can be absorbed by the absorber.
  • the intermediate sheet is preferably transferred to the absorbent body while diffusing the excretory fluid.
  • the excretory fluid is urine, the amount of excretion per time is large. Therefore, the gel block of the absorber can be prevented by diffusing it with an intermediate sheet.
  • the intermediate sheet is transferred to the absorbent body without spreading the excretory fluid in order to improve the concealability of the absorbent article.
  • the intermediate sheet is the absorbent article sheet according to the embodiment described above.
  • the back sheet may be a sheet made of a liquid-impermeable material.
  • the backsheet may or may not be breathable.
  • the absorbent body includes, for example, an absorbent core composed of one or more members selected from a polymer absorbent body (also referred to as “SAP”, which is generally a powdered material), pulverized pulp, fiber aggregate, and film. It may be coated with a core wrap sheet selected from non-woven fabrics and films. Or an absorber may not be coat
  • a polymer absorbent body also referred to as “SAP”, which is generally a powdered material
  • pulverized pulp pulverized pulp, fiber aggregate, and film. It may be coated with a core wrap sheet selected from non-woven fabrics and films. Or an absorber may not be coat
  • the absorbent article includes, for example, disposable diapers, sanitary napkins, postpartum pads, incontinence pads, and the like, but the absorbent article of the present embodiment is not limited to these.
  • Water repellent fiber 1 a single fiber made of polypropylene (melting point 158 ° C.) having a fiber diameter of 31.2 ⁇ m and a fiber length of 51 mm, and having a C16 alkyl phosphate potassium salt as a water repellent fiber treatment agent on the fiber surface
  • the contact angle was 112.3 °.
  • Water repellent fiber 2 A single fiber made of polypropylene (melting point 159 ° C.) having a fiber diameter of 15.7 ⁇ m and a fiber length of 38 mm, and has a C16 alkyl phosphate potassium salt as a water repellent fiber treating agent on the fiber surface.
  • Water-repellent fiber 3 Fiber diameter 30.8 ⁇ m, fiber length 64 mm, the core component is crystalline polypropylene (melting point 160 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and sheath component in the fiber cross section Is a core-sheath type composite fiber (composite ratio (core / sheath, mass ratio) 60/40) concentrically arranged, and a fiber having a C16 alkyl phosphate potassium salt as a water-repellent fiber treatment agent on the fiber surface A fiber (manufactured by Daiwabo Polytech Co., Ltd., trade name NBF (H)) on which 0.4% by mass of the treatment agent is attached to the fiber mass.
  • NBF trade name
  • Water-repellent fiber 4 A solvent-spun cellulose fiber having a fiber diameter of 12.1 ⁇ m and a fiber length of 38 mm, and having a water-repellent fiber treatment agent attached to the fiber surface (trade name Tencel (registered trademark) Bio, manufactured by Renzing) soft).
  • Water repellent fiber 5 a single fiber made of polypropylene (melting point 160 ° C.) having a fiber diameter of 30.8 ⁇ m and a fiber length of 64 mm, and the fiber treatment agent having C16 alkyl phosphate potassium salt is 0 with respect to the fiber mass. .4% by weight of attached fibers.
  • the contact angle was 113.2 °.
  • Fiber 1 Fiber diameter 19.4 ⁇ m, fiber length 51 mm, the core component is polyethylene terephthalate (melting point 260 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and the sheath component are concentric in the fiber cross section Disposed core-sheath type composite fiber (composite ratio (core / sheath, mass ratio) 60/40), comprising C12 alkyl phosphate potassium salt as a hydrophilic fiber treatment agent on the fiber surface, water-resistant and hydrophilic A fiber (manufactured by Daiwabo Polytech Co., Ltd., trade name NBF (SH)) in which a fiber treatment agent is attached in an amount of 0.35% by mass relative to the mass of the fiber.
  • composite ratio composite fiber treatment agent
  • SH water-resistant and hydrophilic A fiber
  • the contact angle was 53.3 °.
  • Fiber 2 Fiber diameter 21.6 ⁇ m, fiber length 51 mm, the core component is polyethylene terephthalate (melting point 260 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and the sheath component are concentric in the fiber cross section Disposed core-sheath type composite fiber (composite ratio (core / sheath, mass ratio) 60/40), comprising C12 alkyl phosphate potassium salt as a hydrophilic fiber treatment agent on the fiber surface, water-resistant and hydrophilic A fiber (manufactured by Daiwabo Polytech Co., Ltd., trade name NBF (SH)) in which a fiber treatment agent is attached in an amount of 0.34% by mass relative to the mass of the fiber.
  • the contact angle was 52.9 °.
  • Fiber 3 Fiber diameter 15.6 ⁇ m, fiber length 45 mm, the core component is polyethylene terephthalate (melting point 260 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and the sheath component are concentric in the fiber cross section
  • Non-water-resistant hydrophilic which is a core-sheath type composite fiber (composite ratio (core / sheath, mass ratio) 60/40), and contains C12 alkyl phosphate potassium salt as a hydrophilic fiber treatment agent on the fiber surface. Fiber with 0.35% by mass of a reactive fiber treating agent attached to the fiber mass (trade name NBF (SH), manufactured by Daiwabo Polytech Co., Ltd.).
  • the contact angle was 60.2 °.
  • Fiber 4 Fiber diameter 19.4 ⁇ m, fiber length 51 mm, the core component is polyethylene terephthalate (melting point 260 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and the sheath component are concentric in the fiber cross section
  • Non-water-resistant hydrophilic which is a core-sheath type composite fiber (composite ratio (core / sheath, mass ratio) 60/40), and contains C12 alkyl phosphate potassium salt as a hydrophilic fiber treatment agent on the fiber surface. Fiber with 0.35% by mass of a reactive fiber treating agent attached to the fiber mass (trade name NBF (SH), manufactured by Daiwabo Polytech Co., Ltd.). The contact angle was 60.5 °.
  • the fiber diameter of each fiber can be arbitrarily determined by observing the fiber side surface using a scanning electron microscope (SEM, manufactured by Hitachi, Ltd., trade name “S-3500N”, magnification 50 to 500 times). The fiber diameter was measured for 100 fibers, and the average value was calculated.
  • SEM scanning electron microscope
  • Examples 1 to 8 Comparative Examples 2 to 4
  • the fibers shown in Tables 1 to 3 as water-repellent fibers, first fibers, second fibers, and other fibers, using a parallel card machine, the first fiber web and the second fibers that become the first fiber layer A second fiber web to be a layer was produced.
  • the target weights of the fiber webs were as shown in Tables 1 and 2, respectively.
  • the obtained first fiber web and second fiber web were laminated to produce a laminated fiber web, and this laminated fiber web was heat-treated for 12 seconds in a hot-air through heat treatment machine set at a temperature of 135 ° C.,
  • the fibers were bonded to each other by the polyethylene resin component of the fiber 1 and / or fiber 2 contained in each of the one fiber web and the second fiber web to obtain a nonwoven fabric composed of the first fiber layer and the second fiber layer.
  • the basis weight of the actually manufactured nonwoven fabric is not necessarily the target basis and has an error, some examples and comparative examples are shown in Tables 1 to 3, and the basis weight of the actually obtained nonwoven fabric is shown in Tables 1 to 3. (Measurement basis weight) is also described.
  • Comparative Example 1 Using only the fiber 1, a fiber web was produced using a parallel card machine. The target weight of the fiber web was 50 g / m 2 . The obtained fiber web was heat-treated for 12 seconds with a hot-air through heat treatment machine set at a temperature of 135 ° C., and the fibers were bonded together by the polyethylene resin component of the fiber 1 to obtain a nonwoven fabric having a single layer structure.
  • Table 2 for convenience, the type, ratio, and basis weight of the fibers used in Comparative Example 1 are shown in the second fiber layer column.
  • the nonwoven fabrics obtained in Examples 1 to 8 and Comparative Examples 1 to 4 were measured for thickness, specific volume, tensile strength in the longitudinal direction (also referred to as machine direction and MD direction), and stress at 10% elongation. The liquid absorption performance and tactile sensation were evaluated. The results are shown in Tables 1 and 2. These measurements and evaluations were performed according to the following methods.
  • the thickness was measured using a thickness measuring machine (trade name: THICKNESS GAUGE model CR-60A, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) with a load of 2.94 cN per 1 cm 2 of the sample.
  • the specific volume was calculated from the basis weight and thickness.
  • Fiber A Fiber diameter 15 ⁇ m, fiber length 45 mm, the core component is polyethylene terephthalate (melting point 260 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and the sheath component are concentrically arranged in the fiber cross section.
  • Core-sheath type composite fiber composite ratio (core / sheath, mass ratio) 60/40
  • the water-resistant hydrophilic fiber treatment agent containing C12 alkyl phosphate potassium salt is on the fiber surface with respect to the fiber mass.
  • 0.40 mass% attached fiber (Daiwabo Polytech Co., Ltd., trade name NBF (SH)).
  • Fiber B Fiber diameter 19.2 ⁇ m, fiber length 51 mm, core component is polyethylene terephthalate (melting point 260 ° C.), sheath component is high-density polyethylene (melting point 132 ° C.), and core component and sheath component are concentric in the fiber cross section
  • a core-sheath type composite fiber composite ratio (core / sheath, mass ratio) 60/40), and a water-resistant hydrophilic fiber treatment agent containing C12 alkyl phosphate potassium salt is added to the fiber mass on the fiber surface.
  • 0.40% by mass of fibers (Daiwabo Polytech Co., Ltd., trade name NBF (SH)).
  • a fiber web A having a basis weight of about 8 g / m 2 was produced using a parallel card machine.
  • a fiber web B having a basis weight of about 12 g / m 2 was prepared using the fiber B using a parallel card machine.
  • a fiber web A and a fiber web B are overlapped to produce a laminated fiber web, and this laminated fiber web is heat-treated for 12 seconds with a hot-air through heat treatment machine set at 135 ° C. to have a basis weight of 18.2 g / m 2.
  • a nonwoven fabric having a thickness of 1.32 mm was obtained. This nonwoven fabric was used as a surface sheet.
  • the physiological saline disappears from the surface of the nonwoven fabric (the physiological saline is transferred from the nonwoven fabric to the absorber located under the nonwoven fabric, and the physiological saline is not confirmed as a liquid on the nonwoven fabric surface)
  • the liquid absorption time was measured with a Lister tester. It can be said that the shorter the liquid absorption time, the higher the liquid absorption speed.
  • the strike-through plate of the Lister tester was removed, three filter papers were placed, and a weight was placed thereon for 20 seconds.
  • Nonwoven fabric nonwoven fabric of Example or Comparative Example
  • Nonwoven fabric is cut into 10 cm ⁇ 10 cm (longitudinal direction ⁇ horizontal direction) and completely immersed in physiological saline contained in a container (30 cm ⁇ 25 cm ⁇ 8 cm) for 15 minutes. It was.
  • the nonwoven fabric was taken out and air-dried in the air for 5 minutes.
  • the liquid retention amount of the nonwoven fabric was calculated from the mass of the nonwoven fabric after air drying and the mass of the nonwoven fabric before immersion.
  • the liquid holding amount was divided by the basis weight, and the liquid holding amount per basis weight was calculated. It can be said that the smaller the amount of liquid retained per unit weight, the higher the liquid retention prevention property.
  • the liquid absorption performance was evaluated using a diaper actually sold.
  • the surface sheet of the diaper (trade name Merry's, manufactured by Kao Corporation) and the two sheets located under the surface sheet are peeled to expose the absorber, and 240 mm x 72 mm (vertical) on the absorber
  • the nonwoven fabric (the nonwoven fabric of an Example or a comparative example) cut
  • the nonwoven fabric was arrange
  • the same surface sheet as that used in the first evaluation method was installed as the surface sheet so that the nonwoven fabrics of the examples or comparative examples function as intermediate sheets.
  • a glass instrument for liquid flow (cylindrical one having a height of 75 mm, an inner diameter of 25 mm, and a wall thickness of 5 mm) was placed, and 50 ml of ion-exchanged water was poured into the liquid flow glass apparatus. The time (liquid absorption time) required until the liquid disappeared from the nonwoven fabric surface was measured. The shorter the liquid absorption time, the higher the liquid absorption speed.
  • each of Examples 1 to 6 when looking at the liquid absorption performance evaluated by the first evaluation method, each of Examples 1 to 6 has almost no difference in liquid absorption speed as compared with Comparative Example 1. The amount of liquid return is small, and better liquid return prevention properties are shown. Further, each of Examples 1 to 6 has a smaller liquid holding amount per unit weight than that of Comparative Example 1, and exhibits better liquid holding resistance. In Examples 7 and 8, compared with Comparative Example 1, the amount of liquid return was small, and better liquid return prevention properties were exhibited. These results are presumed that Examples 1 to 8 have the first fiber layer containing the water-repellent fibers and the first fibers.
  • Examples 2 and 4 have higher liquid absorption speed and smaller liquid return amount than Comparative Examples 2 and 3, respectively. It shows a good anti-return property.
  • Example 2 and Comparative Example 2 and in the combination of Example 4 and Comparative Example 3, only the fiber diameters of the used water-repellent fibers are different, and the other configurations are the same. This indicates that the fiber diameter of the water-repellent fiber affects the liquid absorption performance, and the use of the water-repellent fiber having a larger fiber diameter contributes to the improvement of the liquid absorption performance.
  • the liquid return amount increases because the liquid is held in the fine interfiber gap formed by the thin water-repellent fiber, and the retained liquid oozes out to the surface by pressurization. It is guessed that. In addition, from the results of Examples 2 and 3, it was found that the liquid return amount tends to decrease as the proportion of the water-repellent fibers in the first fiber layer increases.
  • Example 6 the fiber diameter of the first fiber is larger than the fiber diameter of the first fiber used in the other examples.
  • the liquid return amount is smaller than that of Comparative Example 1 as in the other examples, and Example 6 also exhibits good liquid return prevention properties.
  • Example 7 since the core-sheath composite fiber whose core / sheath combination is crystalline polypropylene / high-density polyethylene is used as the water-repellent fiber, the sheath component of the water-repellent fiber also functions as an adhesive component. . Therefore, compared with Example 4 in which the ratios of the water repellent fiber and the first fiber are the same, Example 7 has more adhesion points. This is confirmed by observing the nonwoven fabric surface with an electron microscope. Electron micrographs (60 times) of the nonwoven fabric surfaces of Example 4 and Example 7 are shown in FIGS. 1 and 2, respectively. The difference in the number of adhesion points appears in the tactile sensation, and Example 7 is inferior in tactile sensation compared to Example 4.
  • Comparative Example 4 uses a solvent-spun cellulose fiber with a water-repellent fiber treatment agent attached as the water-repellent fiber.
  • the liquid return amount evaluated by the first evaluation method was larger than each Example. This is presumably because the cellulose fibers used in Comparative Example 4 are inherently hydrophilic unless the water-repellent fiber treatment agent is attached.
  • Example 9 to 14 Using the fibers shown in Tables 4 and 5 as water-repellent fibers, first fibers, and second fibers, using a parallel card machine, the first fiber web that becomes the first fiber layer and the second fiber layer that becomes the second fiber layer A two fiber web was made.
  • the target weights of the fiber webs were as shown in Tables 4 and 5, respectively.
  • the obtained first fiber web and second fiber web were laminated to produce a laminated fiber web, and this laminated fiber web was heat-treated for 12 seconds in a hot-air through heat treatment machine set at a temperature of 135 ° C.,
  • the nonwoven fabric which consists of a 1st fiber layer and a 2nd fiber layer was made to adhere
  • Tables 4 and 5 show the basis weight of the nonwoven fabric actually obtained in each example and each comparative example (actual measurement). (Weight) is also listed.
  • the thickness and specific volume of the nonwoven fabrics obtained in Examples 9 to 14 and Comparative Examples 5 to 8 were measured to evaluate the liquid absorption performance. The results are shown in Tables 4 and 5. The thickness and specific volume were evaluated by the methods described in connection with Examples 1 to 8 and Comparative Examples 1 to 4. The liquid absorption performance was evaluated according to the following method.
  • Liquid absorption performance third evaluation method
  • absorbent articles eg, sanitary napkins
  • a sample is placed under the top sheet In this state, the liquid absorption performance was evaluated.
  • Two types of surface sheets used for evaluating the liquid absorption performance were produced by the following procedure.
  • Fiber ⁇ Fiber diameter 16.0 ⁇ m, fiber length 45 mm
  • core component is polyethylene terephthalate (melting point 260 ° C.)
  • sheath component is high-density polyethylene (melting point 132 ° C.)
  • core component and sheath component are concentric in the fiber cross section
  • the non-water resistant hydrophilic fiber treatment agent containing C12 alkyl phosphate potassium salt is on the fiber surface.
  • Fiber ⁇ Fiber diameter 19.1 ⁇ m, fiber length 38 mm, core component is polyethylene terephthalate (melting point 260 ° C.), sheath component is linear low density polyethylene (melting point 120 ° C.) and low density polyethylene (melting point 106 ° C.) (mass)
  • the ratio linear low density polyethylene / low density polyethylene is a mixture of 85/15
  • an eccentric core-sheath type composite fiber composite having an eccentricity of 25% in which the core component and the sheath component are arranged eccentrically in the fiber cross section Ratio (core / sheath, volume ratio) 50/50), and the water-resistant hydrophilic fiber treatment agent containing C12 alkyl phosphate potassium salt adheres to the fiber surface in an amount of 0.40% by mass with respect to the fiber mass.
  • Fiber (Daiwabo) Fiber diameter 19.1 ⁇ m, fiber length 38 mm
  • core component is polyethylene terephthalate (melting point 260 ° C.)
  • the fiber ⁇ was mixed with 60% by mass and the fiber ⁇ was mixed with 40% by mass, and a parallel card web was manufactured with a target weight of 25 g / m 2 using a parallel card machine.
  • This parallel card web was heat-treated at 132 ° C. for about 15 seconds using a hot-air penetrating heat treatment machine, and the sheath components of the fibers ⁇ and ⁇ were thermally fused to obtain a nonwoven fabric.
  • a thickness of 2400 kg per 1 m 2 was applied to the nonwoven fabric for 10 days to obtain a surface sheet A for evaluation.
  • the basis weight of the surface sheet A was 23.0 g / m 2 and the thickness was 0.53 mm.
  • Fiber ⁇ Fiber diameter 14.8 ⁇ m, fiber length 38 mm, the core component is polypropylene (melting point 160 ° C.), the sheath component is high-density polyethylene (melting point 132 ° C.), and the core component and the sheath component are arranged concentrically in the fiber cross section.
  • Core-sheath type composite fiber complex ratio (core / sheath, mass ratio) 60/40
  • the non-water resistant hydrophilic fiber treatment agent containing C12 alkyl phosphate potassium salt is added to the fiber surface.
  • 0.40% by mass of fibers (Daiwabo Polytech Co., Ltd., trade name NBF (H)).
  • the evaluation surface sheet B is obtained in the same procedure as the evaluation surface sheet A except that 40% by mass of the fiber ⁇ and 60% by mass of the fiber ⁇ used in the manufacture of the surface sheet A are mixed. It was.
  • the basis weight of the surface sheet B was 22.3 g / m 2 and the thickness was 0.53 mm.
  • liquid absorption performance third evaluation method
  • the liquid absorption performance was evaluated using sanitary napkins actually sold.
  • the surface sheet of the sanitary napkin made by Kimberley Clark, trade name “Super Absorbent”
  • the two sheets located under the surface sheet are peeled to expose the absorber, and 240 mm is placed on the absorber.
  • a non-woven fabric non-woven fabric of Example or Comparative Example
  • the nonwoven fabric was arrange
  • the surface sheet A for evaluation was installed for Examples 9 to 11 and Comparative Examples 5 to 6, and the surface sheet B for evaluation was installed for Examples 12 to 14 and Comparative Examples 7 to 8.
  • the example nonwoven fabric was made to function as an intermediate sheet.
  • a plate with an injection cylinder (a two-stage cylinder with a height of 75 mm, an inner diameter of 25 mm at the upper part of the cylinder, and an inner diameter of 10 mm at the lower part of the cylinder) is placed on the top sheet, and 6.0 cc Menstrual blood (viscosity 8 mPa ⁇ s, temperature 37 ° C.) was injected.
  • the time (liquid absorption time) required until the liquid disappeared from the nonwoven fabric surface was measured.
  • the composition of artificial menstrual blood is 12.30% by mass of glycerin, 85.18% by mass of ion-exchanged water, 0.45% by mass of CMC (carboxymethylcellulose sodium), 0.97% by mass of NaCl (sodium chloride), Na 2. CO 3 (sodium carbonate) 1.04% by mass and blue powder 0.06% by mass.
  • Example 9 As shown in Tables 4 and 5, in the comparison between Example 9 and Comparative Example 5, Examples 10 to 11 and Comparative Example 6, Example 12 and Comparative Example 7, Examples 13 to 14 and Comparative Example 8, In all the examples, the liquid return amount is small, and better liquid return prevention properties are shown. Moreover, all the examples showed masking properties superior to those of the comparative examples. This is because the non-woven fabric of the example has the first fiber layer containing the water-repellent fiber having a high fineness and the fiber having a lower water-repellency, so that the liquid does not stay near the surface of the non-woven fabric. It is thought that.
  • Examples 9 and 10 showed a diffusion length smaller than that of Example 11, and Examples 12 and 13 showed a diffusion length smaller than that of Example 14.
  • Example 9, 10, 12 and 13 since the content of the water-repellent fiber was relatively small, the liquid was strongly drawn into the second fiber layer, and as a result, the spread of the liquid in the first fiber layer was suppressed. Conceivable.
  • Example 11 and Comparative Example 6 are compared, and Example 14 and Comparative Example 8 are compared, Example 11 and Example 14 show smaller diffusion lengths, respectively. This is because the first fiber layer is made of water-repellent fibers. By including, it is thought that it was due to exhibiting higher liquid retention resistance.
  • the nonwoven fabric of this embodiment includes the following aspects.
  • a nonwoven fabric comprising a first fiber layer and a second fiber layer located on one main surface of the first fiber layer,
  • the first fiber layer includes a synthetic fiber containing a water-repellent fiber treatment agent (hereinafter “water-repellent fiber”), and a fiber having a lower water repellency than the water-repellent fiber (hereinafter “first fiber”).
  • water-repellent fiber a synthetic fiber containing a water-repellent fiber treatment agent
  • first fiber a fiber having a lower water repellency than the water-repellent fiber
  • the second fiber layer includes fibers having a lower water repellency than the water-repellent fibers (hereinafter referred to as “second fibers”);
  • the fiber diameter of the water repellent fiber is 23.5 ⁇ m or more and 42 ⁇ m or less,
  • the fiber diameter of the first fiber is smaller than the fiber diameter of the water repellent fiber,
  • the ratio (mass%) of the second fibers contained in the second fiber layer is greater than the percentage (mass%) of the water-repellent fibers contained in the first fiber layer.
  • Absorbent article sheet (Aspect 2) The sheet for absorbent articles according to aspect 1, wherein the fiber diameter of the second fiber is smaller than the fiber diameter of the water-repellent fiber.
  • the said 1st fiber layer is a sheet
  • the first fiber is a composite fiber containing two or more components, the component having the lowest melting point (hereinafter referred to as “low melting component”) constitutes at least a part of the fiber surface, and the melting point of the low melting component is The absorbent article sheet according to aspect 5, wherein the constituent fibers are adhered to each other by the low-melting-point component, which is lower than the melting point of the component constituting at least the surface of the water-repellent fiber.
  • (Aspect 12) The aspect which is an intermediate sheet arrange
  • An absorbent article comprising a top sheet, a back sheet, an absorbent body disposed between the top sheet and the back sheet, and an intermediate sheet disposed between the top sheet and the absorbent body.
  • An absorbent article, wherein the intermediate sheet is a sheet for absorbent articles according to any one of aspects 1 to 11.
  • the sheet for absorbent articles of the present embodiment has a well-balanced liquid absorption rate, liquid return prevention property and liquid holding property prevention. Therefore, the absorbent article sheet of the present embodiment includes, for example, a topsheet, a backsheet, and an absorbent article having an absorbent body disposed between the topsheet and the backsheet. It is suitably used as an intermediate sheet disposed between the two.

Landscapes

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

Abstract

L'invention concerne une feuille pour un article absorbant ayant un équilibre amélioré entre une vitesse d'absorption de liquide, une propriété de prévention de retour de liquide et une propriété de prévention de rétention de liquide. La feuille pour un article absorbant est un tissu non tissé comprenant une première couche de fibres et une seconde couche de fibres positionnée sur une surface principale de la première couche de fibres. La première couche de fibres comprend une fibre synthétique (ci-après désignée par « fibre hydrofuge ») contenant un agent de traitement de fibres hydrofuges, et une fibre (ci-après désignée par « première fibre ») ayant un caractère hydrofuge inférieur à celui de la fibre hydrofuge. La seconde couche de fibres comprend une fibre (ci-après désignée par « seconde fibre ») ayant un caractère hydrofuge inférieur à celui de la fibre hydrofuge. Le diamètre de fibre de la fibre hydrofuge est de 23,5 à 42 µm. Le diamètre de fibre de la première fibre est inférieur au diamètre de fibre de la fibre hydrofuge. La proportion (% en masse) de la seconde fibre contenue dans la seconde couche de fibres est supérieure à la proportion (% en masse) de la fibre hydrofuge contenue dans la première couche de fibres.
PCT/JP2018/005236 2017-03-30 2018-02-15 Feuille pour article absorbant, et article absorbant Ceased WO2018179957A1 (fr)

Priority Applications (2)

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JP2018526733A JP6366892B1 (ja) 2017-03-30 2018-02-15 吸収性物品用シートおよび吸収性物品
TW107105771A TW201836564A (zh) 2017-03-30 2018-02-21 吸收性物品用片材及吸收性物品

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JP2017-068437 2017-03-30
JP2017068437 2017-03-30

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WO2018179957A1 true WO2018179957A1 (fr) 2018-10-04

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JP2021159314A (ja) * 2020-03-31 2021-10-11 ダイワボウホールディングス株式会社 吸収性物品用不織布、及びこれを含む吸収性物品
JP2023503774A (ja) * 2019-09-18 2023-02-01 ジョージア パシフィック マウント ホリー エルエルシー 吸収性不織布材料

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JP2006239127A (ja) * 2005-03-03 2006-09-14 Chisso Corp 吸収体用拡散シート
JP2006305044A (ja) * 2005-04-28 2006-11-09 Kao Corp 吸収性物品の表面シート
US20160067118A1 (en) * 2014-09-10 2016-03-10 The Procter & Gamble Company Nonwoven Web
JP2016069748A (ja) * 2014-09-30 2016-05-09 花王株式会社 不織布
JP2016195753A (ja) * 2015-04-03 2016-11-24 王子ホールディングス株式会社 エアレイド不織布および吸収性物品
JP2017089063A (ja) * 2015-11-13 2017-05-25 ダイワボウホールディングス株式会社 液体含浸皮膚被覆シート用不織布および液体含浸皮膚被覆シート

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Publication number Priority date Publication date Assignee Title
JP2006239127A (ja) * 2005-03-03 2006-09-14 Chisso Corp 吸収体用拡散シート
JP2006305044A (ja) * 2005-04-28 2006-11-09 Kao Corp 吸収性物品の表面シート
US20160067118A1 (en) * 2014-09-10 2016-03-10 The Procter & Gamble Company Nonwoven Web
JP2016069748A (ja) * 2014-09-30 2016-05-09 花王株式会社 不織布
JP2016195753A (ja) * 2015-04-03 2016-11-24 王子ホールディングス株式会社 エアレイド不織布および吸収性物品
JP2017089063A (ja) * 2015-11-13 2017-05-25 ダイワボウホールディングス株式会社 液体含浸皮膚被覆シート用不織布および液体含浸皮膚被覆シート

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023503774A (ja) * 2019-09-18 2023-02-01 ジョージア パシフィック マウント ホリー エルエルシー 吸収性不織布材料
JP7729807B2 (ja) 2019-09-18 2025-08-26 グラットフェルター・コーポレイション 吸収性不織布材料
JP2021159314A (ja) * 2020-03-31 2021-10-11 ダイワボウホールディングス株式会社 吸収性物品用不織布、及びこれを含む吸収性物品
JP7371316B2 (ja) 2020-03-31 2023-10-31 大和紡績株式会社 吸収性物品用不織布、及びこれを含む吸収性物品

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