WO2016194243A1 - 吸収性物品用不織布 - Google Patents
吸収性物品用不織布 Download PDFInfo
- Publication number
- WO2016194243A1 WO2016194243A1 PCT/JP2015/072922 JP2015072922W WO2016194243A1 WO 2016194243 A1 WO2016194243 A1 WO 2016194243A1 JP 2015072922 W JP2015072922 W JP 2015072922W WO 2016194243 A1 WO2016194243 A1 WO 2016194243A1
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- WIPO (PCT)
- Prior art keywords
- nonwoven fabric
- convex
- recess
- absorbent articles
- fibers
- 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
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—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
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—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
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
- A61F13/51108—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction
-
- 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
- A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
- A61F13/5123—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations the apertures being formed on a multilayer top sheet
-
- 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
- A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
- A61F13/5123—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations the apertures being formed on a multilayer top sheet
- A61F13/5125—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations the apertures being formed on a multilayer top sheet the apertures not being formed through the complete thickness of the topsheet, e.g. blind holes
-
- 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
- A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
- A61F13/5126—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations characterised by the planar distribution of the apertures, e.g. in a predefined pattern
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- 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
- D04H13/00—Other non-woven fabrics
-
- 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
- A61F13/15577—Apparatus or processes for manufacturing
-
- 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
- A61F2013/51002—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 with special fibres
- A61F2013/51023—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 with special fibres being polymeric fibres
- A61F2013/51026—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 with special fibres being polymeric fibres being in thermoplastic material
-
- 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
- A61F13/512—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations
- A61F2013/5127—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its apertures, e.g. perforations characterized by the dimension of apertures
-
- 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
- A61F2013/51338—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 having improved touch or feeling, e.g. smooth film
Definitions
- the present invention relates to a nonwoven fabric used for absorbent articles such as disposable diapers, sanitary napkins and incontinence pads.
- a nonwoven fabric used as a constituent member such as a top sheet is a part that touches the user's skin. Therefore, in recent years, a nonwoven fabric provided with a plurality of rows of protrusions and grooves provided in the space between adjacent protrusions on the surface that comes into contact with the skin is often used. Such a non-woven fabric tends to feel the flexibility of the non-woven fabric because the relatively soft convex portion comes into contact with the skin and the convex portion easily fits the skin surface.
- non-woven fabric in order to further improve the touch by a delicate and soft feel, for example, as described in Patent Document 1, an island having a smaller size than the convex portion is formed on the surface of the arch-shaped convex portion. There is one provided with a small convex portion.
- the non-woven fabric described in Patent Document 1 reduces the contact area of the non-woven fabric with the skin by the small convex portions, thereby making it easier to feel a dry sensation and slipping when touching the non-woven fabric, and improving the touch. It is about to try.
- the non-woven fabric described in Patent Document 1 has a reduced touch area of the non-woven fabric with respect to the skin, but the touch is improved compared to the case where there are no small convex portions.
- the uneven surface due to the presence of small protrusions may leave a dry, rough feel on the nonwoven fabric surface, so it does not reach a delicate, soft, skin-friendly feel. there is a possibility.
- the technical problem of the present invention is to provide a non-woven fabric for absorbent articles that can provide a delicate, soft, and soft feel when touched by fingers.
- the nonwoven fabric for absorbent articles of the present invention for solving the above problems is as follows. (1) A first surface and a second surface opposite to the first surface, a plurality of convex portions projecting from the second surface toward the first surface, and the first surface A nonwoven fabric for absorbent articles comprising a plurality of grooves recessed in the direction of the second surface from the thermoplastic resin fiber, wherein the convex portion is in the first direction in the planar direction of the nonwoven fabric.
- a nonwoven fabric for absorbent articles wherein a distance between the tops of the other convex portions is 0.5 to 2 mm, and an average fiber diameter of fibers forming at least the convex portions in the nonwoven fabric is 10 to 30 ⁇ m.
- the second concave portion has a peripheral wall portion extending from the first bottom portion in a direction opposite to a direction in which the convex portion protrudes, and is opposite to the first bottom portion in the peripheral wall portion.
- the peripheral wall portion of the second recess includes a pair of first peripheral wall portions formed along the first direction, and a pair of second peripheral wall portions formed along the second direction.
- the said 1st surrounding wall part is a nonwoven fabric for absorbent articles as described in said (3) provided with the hole part penetrated between the said 1st surface and the said 2nd surface.
- the flexibility of the convex portion can be further improved, and the fibers of the convex portion can easily follow the concave and convex portions of the fingerprint of the finger, and the delicate and soft touch that is easy to adjust to the skin can be more stable. Obtainable.
- the hole has a peripheral edge formed without melting the thermoplastic resin fiber, and the peripheral edge has a broken end formed by breakage of the thermoplastic resin fiber.
- thermoplastic resin fibers in the internal space can prevent a boundary or a step between the first peripheral wall portion or the second bottom portion of the second recess and the hole portion. Can be small. Thereby, even if the hole is present, the smooth touch can be maintained, so that the uncomfortable feeling when touched due to the presence of the hole can be reduced.
- the distance from the first surface of the first bottom portion to the first surface of the second bottom portion in the first recess is 0.05 to 2 mm.
- the average fiber diameter of the fibers forming the convex portion is smaller than the width between the protrusions of the fingerprints of the fingers of the hand, and the distance between the top portions of the adjacent convex portions is predetermined.
- the fibers forming the convex portions can easily enter between the protruding portions.
- the second concave portion due to the presence of the second concave portion, the area where the first bottom portion of the first concave portion is in contact with the skin is suppressed, and a soft touch can be obtained.
- a soft touch can be obtained as a whole of the nonwoven fabric, and the fibers forming the convex portions stimulate the tactile organs on the flat portions between the adjacent protruding portions of the fingerprints of the fingers of the hand and the side portions of the protruding portions. Therefore, it is delicate and soft, and it is easy to adjust to the skin and a moist feel can be obtained.
- FIG. 1 is a partially broken perspective view schematically showing an embodiment of a nonwoven fabric for absorbent articles according to the present invention.
- FIG. 2 is a plan view schematically showing one embodiment of the nonwoven fabric for absorbent articles according to the present invention.
- 3 is an enlarged cross-sectional view of a main part taken along line AA in FIG. 4A is a diagram schematically showing a fingerprint of a finger
- FIG. 4B is a cross-sectional view illustrating a state in which fibers forming convex portions in the nonwoven fabric for absorbent articles according to the present invention are in contact with the fingerprint of the finger.
- FIG. 5 is a diagram schematically showing an example of a production apparatus for producing the nonwoven fabric for absorbent articles according to the present invention.
- FIG. 5 is a diagram schematically showing an example of a production apparatus for producing the nonwoven fabric for absorbent articles according to the present invention.
- FIG. 6 is an enlarged perspective view of a main part schematically showing a pair of stretching rolls of the shaping apparatus.
- FIG. 7 is an enlarged view of a main part schematically showing the arrangement of pins of the lower drawing roll.
- FIG. 8 is an enlarged view of a main part showing a state in which the upper drawing roll and the lower drawing roll are engaged with each other.
- a nonwoven fabric 1 of this embodiment includes a first surface 2 and a second surface opposite to the first surface 2.
- This is for an absorbent article including a thermoplastic resin fiber and having a plurality of grooves 5 recessed in a direction (downward in FIGS. 1 to 3).
- the nonwoven fabric 1 has a first direction X in the plane direction of the nonwoven fabric 1 and a second direction Y orthogonal to the first direction X in the plane direction of the nonwoven fabric 1.
- the direction in which the convex portion 4 protrudes is described as the upper direction
- the direction opposite to the direction in which the convex portion protrudes is described as the lower direction.
- the nonwoven fabric of the present invention is disposed on the top sheet or leakage barrier of absorbent articles such as disposable diapers, sanitary napkins, urine pads, and panty liners, that is, on the side of the absorbent article that contacts the user's skin. It is suitably used as a sheet. Or it is used also as a sheet
- the nonwoven fabric of this invention is used for an absorbent article, the 2nd surface of this nonwoven fabric is joined to each structural member (for example, absorber when used as a top sheet). The At this time, it is very preferable that the second surface side of the convex portion (particularly the top portion) is not joined.
- thermoplastic resin constituting the thermoplastic resin fiber contained in the nonwoven fabric examples include polyolefin, polyester, and polyamide.
- polyolefin examples include, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene, polybutylene, and copolymers based on these (for example, Ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-acrylic acid copolymer (EAA), ionomer resin) and the like.
- LLDPE linear low density polyethylene
- LDPE low density polyethylene
- MDPE medium density polyethylene
- HDPE high density polyethylene
- EVA Ethylene-vinyl acetate copolymer
- EAA ethylene-ethyl acrylate copolymer
- EAA ethylene-acrylic acid copolymer
- polyesters examples include linear or branched carbon atoms of up to 20 including polyethylene terephthalate (PET), polytrimethyl terephthalate (PTT), polybutylene terephthalate (PBT), polylactic acid, and polyglycolic acid. And polyesters such as polyhydroxyalkanoic acid, copolymers based on these, and copolymerized polyesters obtained by copolymerizing alkylene terephthalate as a main component with a small amount of other components.
- polyamide examples include 6-nylon and 6,6-nylon.
- the fiber length is usually 20 to 100 mm, preferably 35 to 65 mm.
- the thermoplastic resin fiber may be subjected to a hydrophilization treatment. Examples of the hydrophilization treatment include a treatment using a surfactant, a hydrophilic agent, etc. (for example, kneading a surfactant into the fiber, fiber And the like) and the like.
- the nonwoven fabric of the present invention may contain other constituent fibers in addition to the thermoplastic resin fibers.
- other constituent fibers include natural fibers (eg, wool, cotton, etc.), regenerated fibers (eg, rayon, acetate, etc.), inorganic fibers (eg, glass fiber, carbon fiber, etc.), and the like.
- Non-woven fabrics include core-sheath fibers, side-by-side fibers, island / sea fibers, etc .; hollow fibers; flat fibers, Y-shaped fibers, C-shaped fibers, etc .; latent crimps Alternatively, three-dimensional crimped fibers of actual crimps; split fibers that are split by a physical load such as water flow, heat, embossing, or the like may be mixed.
- the nonwoven fabric 1 is a substantially wave formed by alternately folding back a sheet-like unprocessed nonwoven fabric, which is a material, in a direction on the first surface 2 side and a direction on the second surface 3 side, that is, upward and downward.
- the above-mentioned plurality of convex portions 4 are formed by the portion folded back toward the first surface 2 side, that is, upward, and the direction opposite to the direction in which the convex portions 4 protrude,
- the plurality of groove portions 5 described above are formed by a portion folded downward.
- the convex portions 4 are continuously extended toward the first direction X in the planar direction (sheet surface) of the nonwoven fabric 1 and are provided in a plurality of rows at predetermined intervals in the second direction Y. In this embodiment, each of the convex portions 4 extends continuously in the first direction X so as to be substantially parallel to the other convex portions 4.
- the groove portion 5 extends in the first direction X in a space between the convex portions 4 and 4 adjacent in the second direction Y.
- the groove 5 includes a first recess 11 having a first bottom 12 positioned in the direction of the second surface 3 relative to the position of the first surface 2 at the top 4 a of the protrusion 4, that is, in the first recess 11.
- a plurality of second recesses 16 that are formed discontinuously in the first direction X and are formed in a hollow shape that opens in the first bottom portion 12.
- the first concave portion 11 is formed integrally with the convex portion 4 in the second direction Y.
- the first bottom portion 12 of the first recess 11 has the largest thickness (the maximum distance between the first surface 2 and the second surface 3) in the nonwoven fabric 1, and the first bottom portion 12 has the largest thickness. Is a part with excellent elasticity as a whole. Note that the plurality of first recesses 11 formed in the nonwoven fabric 1 are all formed to have the same width.
- the second recess 16 has a substantially rectangular opening in plan view (viewed from above in this embodiment), and protrudes to the lower side of the nonwoven fabric 1 as a whole, and has a substantially rectangular parallelepiped internal space. It has become a thing. Further, the second recesses 16 are arranged at regular intervals in the first direction X of each groove 5, more specifically in the first direction X of the first recess 11, and each of these second recesses 16 is The other second recesses 16 are formed independently of each other. Further, the second concave portion 16 includes a standing wall-shaped peripheral wall portion 17 extending downward from the first bottom portion 12, which is a direction opposite to the direction in which the convex portion 4 protrudes, and the peripheral wall portion 17. In the end opposite to the first bottom 12, that is, on the lower end, the end is positioned in the direction of the second surface 3 from the first bottom 12, that is, below the first bottom 12. A second bottom 18.
- the second bottom portion 18 is formed by compressing the fibers constituting the nonwoven fabric 1 in the vertical direction, and has the highest fiber density and the largest rigidity in the nonwoven fabric 1. Further, the first surface 2 (that is, the surface on the inner side of the second recess 16) and the second surface 3 of the second bottom portion 18 are formed in a substantially planar shape as a whole.
- the non-woven fabric provided with the second recesses reduces the chance that the groove bottoms of the groove portions, more specifically, the first bottom portions of the first recesses contact the skin, and tentatively the first bottom portions. This is to reduce the contact area as much as possible even when touching the skin. That is, when the nonwoven fabric according to the present invention is used as a top sheet for an absorbent article, for example, the second surface of the nonwoven fabric is joined to the absorbent body of the absorbent article. Next, it becomes easier to touch the skin in the order of the first bottom of the first recess.
- a convex part (especially top part) is hardly joined to an absorber and a softness
- flexibility also increases, it is preferable that a convex part touches skin more than a 1st bottom part.
- a nonwoven fabric used for a top sheet or the like flexibility is easily felt when the contact area with which the skin is touched as a whole nonwoven fabric is small. Therefore, in the present invention, by providing the second recess and forming a portion where the first bottom does not exist, the portion of the first recess that contacts the skin is made smaller, and the skin is in contact with the first bottom.
- the second recess is provided on the first bottom because the second recess is provided on the first bottom of the first recess that is less likely to touch the skin than the projection. This is because the distance between the second concave portion and the second concave portion touches the skin as much as possible. Thereby, the uncomfortable feeling and foreign object feeling by touching the 2nd recessed part with high fiber density and high rigidity compared with another part can be suppressed as much as possible.
- the height of the bottom of the second recess is determined from the height of the first bottom of the first recess (in this case, the position closest to the second bottom) on the first surface (in this case, the upper surface) side.
- the size up to the height of the first surface depends on the thickness of the nonwoven fabric, but is preferably 0.05 to 2 mm, more preferably 0.075 to 1.5 mm, more preferably 0.1 to 1 mm. That is.
- the fiber density at the time of forming the second bottom Becomes difficult to ensure rigidity, and the strength in the thickness direction of the nonwoven fabric may be insufficient.
- the second bottom portion is bonded to another member of the absorbent article, such as an absorbent body, another nonwoven fabric, or a film, the peripheral wall portion of the second recess extends too long and the thickness of the nonwoven fabric is increased. While there is no strength in the vertical direction, there is a possibility of feeling hardness when compressed.
- the size from the height of the first surface of the first bottom portion of the first concave portion to the height of the first surface of the second bottom portion of the second concave portion is the first concave portion. Is preferably 10 to 80% of the size from the height of the first surface of the first bottom portion (in this case, the position closest to the second bottom portion) to the height of the top surface of the convex portion on the first surface side, More preferably, it is 15 to 70%, more preferably 20 to 60%.
- the height from the first surface side height of the first bottom of the first recess to the height of the first surface side of the second bottom of the second recess is the height on the first surface side of the first bottom of the first recess. If it is less than 10% of the size from the height to the height of the first surface of the top of the convex portion, a sufficient space for forming the hole in the peripheral wall cannot be secured, and the formation of the hole becomes insufficient. Protrusions and, as a result, flexibility as a nonwoven fabric cannot be obtained. On the other hand, if it exceeds 80%, the second concave portion becomes too deep, the strength of the peripheral wall portion is lowered and the fluff is likely to be fluffed, and the touch may be lowered.
- the lengths of the second recesses in the first direction and the second direction are preferably 0.25 to 5 mm, more preferably, although depending on the groove width of the groove, that is, the distance between adjacent protrusions. Is 0.5 to 3 mm, more preferably 0.75 to 2 mm. If the length of the second recess in the first direction or the second direction is less than 0.25 mm, the second recess becomes too small and the formation of the second bottom becomes insufficient, so the second recess hardly functions. there is a possibility. On the other hand, if it exceeds 5 mm, the second concave portion becomes too large, and there is a possibility that a sense of incongruity or foreign matter due to the concave portion is easily felt on the skin.
- the peripheral wall portion 17 includes a pair of first peripheral wall portions 19 and 19 formed along the first direction X, and a pair of second peripheral wall portions 20 and 20 formed along the second direction Y. have.
- the pair of first peripheral wall portions 19, 19 are disposed at positions facing each other, and the pair of second peripheral wall portions 20, 20 are also disposed at positions facing each other.
- the pair of first peripheral wall portions 19, 19 are respectively formed with hole portions 21 that lead from the internal space of the first recess 11 to the second surface 3.
- one hole portion 21 is provided in each of the pair of first peripheral wall portions 19, 19, and these hole portions 21 are close to the second bottom portion 18 in the first peripheral wall portion 19. (Thus, there are two holes 21 in one second recess 16).
- the reason why the hole portion 21 is provided in the first peripheral wall portion 19 is to release the fiber tension of the convex portion 4 adjacent to the groove portion 5 in which the hole portion 21 is provided. Accordingly, the degree of freedom of movement of the entire convex portion 4 or the fibers forming the convex portion 4 is improved, and the flexibility of the convex portion 4, more specifically, the thickness direction (from the first surface 2 to the first surface 2) of the convex portion 4 is improved. 2 direction 3) and the softness when the skin is slid in the first direction X and the second direction Y (especially the second direction Y) of the nonwoven fabric 1 for a smooth feel. Can be secured.
- the convex part 4 has an excellent hardness and softness (excellent softness in the thickness direction) and an excellent rough feeling in the first direction X and the second direction Y (the surface of the nonwoven fabric 1 (particularly the second direction). Y) both excellent smoothness) can be imparted, and excellent softness and rough feeling can be ensured as the nonwoven fabric 1 as a whole, and a soft touch can be realized.
- the hole portion 21 is not provided in the second peripheral wall portion 20 when the skin is slid in the first direction X of the nonwoven fabric 1, that is, in the direction in which the convex portions 4 and the groove portions 5 extend.
- the hole 21 is provided at a position near the second bottom 18 in the first peripheral wall 19 because the hole 21 is moved as far as possible from the convex part 4 and the first bottom 12 which are easily touched by the skin. This is to reduce the chance that 21 touches the skin as much as possible, making it difficult to feel uncomfortable or foreign matter. Thereby, the smoothness at the time of making skin slide in the plane direction of the nonwoven fabric 1 can be ensured more stably.
- the hole part 21 is provided with the peripheral part 22 formed by fracture
- the peripheral edge portion 22 of the hole portion 21 includes the broken end portion 23a of the broken fiber 23 including the broken end portion 23a formed by breaking the thermoplastic resin fiber among the thermoplastic resin fibers.
- the thermoplastic resin fiber cured by melting or the like is not included.
- the broken end portion 23a of the broken fiber 23 is a part of the thermoplastic resin fiber contained in the first peripheral wall portion 19, and the thermoplastic resin fiber is pulled in the first direction X or physically cut. It is formed by breaking by doing.
- the broken fiber 23 does not melt and become round as the end of the fiber melts, as in the case where the thermoplastic resin fiber is melted, and the fiber diameter does not increase or harden. Or the fiber diameter hardly changes.
- the skin touches the peripheral edge portion 22 of the hole portion 21 since there is no thermoplastic resin fiber cured by melting in the peripheral edge portion 22, a sense of incongruity due to stiffness or fiber catching is suppressed, Feeling the hardness and roughness of the nonwoven fabric 1 is suppressed.
- thermoplastic resin fibers 24 spanned in the internal space 21a and a part of the broken fibers 23 in which the broken end portions 23a extend into the internal space 21a. It is in a mixed state and is not a completely open space.
- the thermoplastic resin fiber in the space 21 a can reduce the boundary or step between the first peripheral wall portion 19 or the second bottom portion 18 of the second recess 16 and the hole portion 21. Thereby, even if the hole 21 is present, a smooth touch can be maintained.
- the opening ratio of the internal space of the hole is preferably 1 to 50%, more preferably 1.5 to 35%, and more preferably 2.5 to 20%. . If the opening ratio of the internal space of the hole is less than 1%, the opening ratio is too low to give a degree of freedom to the protrusions and the fibers of the protrusions, and the protrusions have sufficient flexibility. It cannot be secured. On the other hand, if it exceeds 50%, the strength of the first peripheral wall portion provided with the hole portion tends to be low, and the boundary between the peripheral portions of the hole portion may be easily understood on the touch.
- the open area ratio of the internal space of the hole may be outside the above range depending on the type or application of the absorbent article, and can be arbitrarily set.
- the length of the maximum portion of the hole (in this embodiment, the length in the first direction) is 0.25 to 5 mm, although it depends on the size of the second recess.
- the thickness is 0.5 to 3 mm, more preferably 0.75 to 2 mm. If the length of the maximum portion of the hole is less than 0.25 mm, the formation of the hole is insufficient, the flexibility of the second recess cannot be ensured, and the fiber tension of the protrusion does not decrease. It is not possible to secure sufficient flexibility. On the other hand, if it exceeds 5 mm, the hole is too large and the peripheral edge of the hole is likely to fluff.
- the maximum length in the height direction of the hole portion is preferably 0.1 to 5 mm, more preferably 0.25 to 3 mm, and still more preferably 0.2 mm, although it depends on the depth of the second recess. 5 to 2 mm. If the maximum length in the height direction of the hole is less than 0.1 mm, the formation of the hole is insufficient, and even in this case, the flexibility of the second recess cannot be secured, Sufficient flexibility of the convex portion cannot be ensured without decreasing the fiber tension.
- the average fiber diameter of the fibers 4b forming at least the convex portions 4 of the nonwoven fabric 1 is 10 to 30 ⁇ m.
- the average fiber diameter of the fibers forming the convex portions is set to 10 to 30 ⁇ m because when the finger skin touches the convex portions, it is delicate and soft, easy to adjust to the skin and moist. This is to make it possible.
- the average fiber diameter of the fibers forming the convex portions is a very important factor for obtaining a non-woven fabric that is delicate, soft, easy to adjust to the skin and moist.
- the relationship between the distance (pitch) between adjacent convex portions of the unevenness of the surface of the object and the distance between adjacent protrusions of the fingerprint of the finger This is said to perceive whether the surface of the object is smooth or rough. That is, when the convex part on the surface of an object enters between the protrusions of a fingerprint of a finger and stimulates a flat part that is a depression between the protrusions of the fingerprint or a side part other than the tip of the protrusion, The haptic organ is stimulated to give a delicate, soft, smooth feel.
- a fingerprint of a human finger is said to have a distance between adjacent protrusions of about 460 ⁇ 15 ⁇ m. Therefore, in the present invention, the convex part that is most easily touched by the skin in the nonwoven fabric is formed by fibers having an average fiber diameter sufficiently smaller than the distance between adjacent protrusions in the fingerprint, and the convex part of the nonwoven fabric is touched with a finger. In this case, the fibers forming the convex portions easily enter between the fingerprint projections of the finger.
- a human finger 30 has a fingerprint formed by a plurality of protrusions 31 and a flat portion 32 that is depressed between these protrusions 31.
- the average fiber diameter of the fibers 4b forming the convex part 4 is smaller than the distance between the adjacent protruding parts 31 in the finger 30, so that FIG.
- the fiber 4b forming the convex part 4 enters between the adjacent protruding parts 31 and 31 in the fingerprint of the finger 30.
- the plurality of fibers 4b forming the convex portion 4 come into contact with the flat portion 32 of the finger 30 and the side surface portion 31a of the protruding portion 31 and stimulate the tactile organs of the finger 30. A moist feel that is easy to get along with will be obtained.
- the average fiber diameter of the fibers forming the convex portions is less than 10 ⁇ m, the bulk of the nonwoven fabric is insufficient and the fiber density tends to increase, so that flexibility may be impaired. Moreover, the strength of the whole nonwoven fabric also decreases. On the contrary, if it exceeds 30 ⁇ m, it may be difficult to touch between the adjacent protrusions on the fingerprint of the hand, especially the flat part, and it may be difficult to obtain a delicate sensation and a moist feeling may not be obtained. There is.
- the average fiber diameter of the fibers forming the projections is more preferably 10 to 20 ⁇ m.
- Measurement of the average fiber diameter of the fibers forming the convex portions is obtained by obtaining an enlarged image of the fibers forming the convex portions with an electron microscope or a microscope (for example, VHX-2000 manufactured by KEYENCE), and the diameter of the fibers reflected in the image. Measurement is performed by measuring the distance between two points corresponding to 1. The number of measurements is 100, and the average value is the average fiber diameter.
- the average interfiber distance of the fibers forming the convex portion 4 is set to 50 to 150 ⁇ m.
- the average interfiber distance of the fibers forming the convex portions is 50 to 150 ⁇ m because the position of the fibers forming the convex portions is more adapted to the distance between the adjacent protruding portions in the fingerprint of the finger. This is because the fibers forming the convex portions are made to come into contact with the fingerprints of the fingers as much as possible. As a result, the fibers can be more stably and reliably inserted between the protrusions of the fingerprint of the finger, so that when touching the protrusion with a finger, it is easy to become familiar with the skin and ensure a moist feel.
- the average interfiber distance of the fibers forming the convex portion is less than 50 ⁇ m, the interfiber distance becomes too close, and as a result, the fibers are difficult to move. It becomes difficult to follow the unevenness. On the other hand, if it exceeds 150 ⁇ m, it becomes difficult for the fibers forming the convex portion to enter between adjacent protrusions in the fingerprint of the finger of the hand, and the number of fibers that can enter is reduced, so it is difficult to obtain a delicate sensation. There is a possibility that the interval that is easy to adjust to the skin is impaired.
- the average interfiber distance of the fibers forming the convex portions is more preferably 60 to 130 ⁇ m, and even more preferably 70 to 110 ⁇ m.
- the average interfiber distance of the fibers forming the convex portions can be measured using, for example, a mercury porosimeter (manufactured by Shimadzu Corporation) in accordance with the mercury intrusion method (JIS R 1655).
- This mercury intrusion method measures the pressure applied to mercury when mercury is injected between the constituent fibers of the nonwoven fabric, which is the object to be measured, and the volume of mercury pushed into the space between the constituent fibers of the nonwoven fabric. By doing, the information regarding the structure of the said nonwoven fabric can be obtained.
- the interfiber distance of the nonwoven fabric can be measured according to the following procedure using a mercury porosimeter. 1) Cut a non-woven fabric, which is an object to be measured, into 24 mm ⁇ 15 mm to prepare a measurement sample. Three samples for measurement are prepared. 2) After setting the three measurement samples in a sample cell of a mercury porosimeter (manufactured by Shimadzu Corporation) so as not to overlap each other, gradually changing the pressure applied to the mercury, between the constituent fibers of the nonwoven fabric The volume of mercury (ie, pore volume) pushed into the space (ie, pores) is measured. The measurement is performed in an environment of 22 ° C. and 65% RH.
- the pore diameter D ( ⁇ m) of the pores (that is, the distance between the fibers of the nonwoven fabric ( ⁇ m)) is calculated, and the relationship between the pore diameter D and the pore volume is expressed as the pore diameter D.
- a distribution curve (differential / integral curve).
- the various measurement conditions in the following formula (1) are a mercury surface tension of 0.483 N / m, a contact angle of 130 °, and a mercury pressure of 0 to 414 MPa (absolute pressure).
- D represents the pore diameter (distance between fibers)
- ⁇ represents the surface tension of mercury
- ⁇ represents the contact angle
- P represents the pressure.
- the following method can be used. That is, a non-woven fabric to be measured is cut into a square shape of 5 cm square, and a 3D image connecting function of a microscope (VHX-2000 made by KEYENCE, lens VH-Z20W aperture open) is used from the surface of this sample. A 200-fold magnified image having the same focal point up to a depth of 100 ⁇ m is obtained, the outside of the focused fiber is extracted based on the magnified image, and the surface formed there is defined as a fiber space. The area occupied by the fiber space is determined using the area measuring function of the microscope.
- VHX-2000 made by KEYENCE, lens VH-Z20W aperture open
- the fiber space diameter (r) is obtained by the following formula (2), and the fiber space diameter (r) is determined as the interfiber distance.
- the nonwoven fabric 1 is the space
- the distance (pitch pitch) is 0.5 to 2 mm.
- the distance between the top of the convex portion and the top of another convex portion adjacent to the convex portion is set to 0.5 to 2 mm when the finger of the hand touches the nonwoven fabric.
- the finger touches the non-woven fabric is sensitive to the non-woven fabric, whether it is delicate and soft, easy to adjust to the skin, and moistened by the side surface of the finger's fingerprint projection. Whether or not it is done is a problem.
- the stimulus to the side surface portion of the protrusion is not only when the fibers forming the protrusions enter between the fingerprint protrusions of the finger, but when the finger touches the nonwoven fabric, This may also occur when the side surface portion directly touches the surface of the nonwoven fabric.
- the finger of a hand touches the non-woven fabric the finger often enters not only the convex part but also between the convex part and the convex part.
- the distance between the top of the convex portion and the top of another convex portion adjacent to the convex portion is set to 0.5 to 2 mm.
- the distance between the top of the convex part and the top of another convex part adjacent to the convex part is less than 0.5 mm, the distance between the top part of the convex part and the top part of the adjacent convex part is short. Therefore, it is difficult to say that the nonwoven fabric forms a concavo-convex structure. As a result, the contact area with the skin due to the convex portion cannot be reduced so much, and the touch may be lowered. Conversely, if the distance between the top of the convex part and the top of another convex part adjacent to the convex part exceeds 2 mm, the distance between the top part of the convex part and the top part of the adjacent convex part is too large.
- the finger When the first surface of the nonwoven fabric is traced with a finger, the finger is likely to touch the first recess, and as a result, there are many opportunities to touch the second bottom of the second recess with high fiber density and high rigidity. It becomes difficult to adapt to the skin.
- the measurement of the distance between the top part of a convex part and the top part of the other convex part adjacent to the convex part is performed, for example with the following method.
- a sharp blade is prepared (for example, standard replacement blade HA-100NB for cutter knife HA-7NB (trade name) manufactured by KOKUYO Co., Ltd.) and the nonwoven fabric is cut. After cutting, the sheet is allowed to stand for 24 hours or more, and then the cross section of the sheet is enlarged five times with a microscope manufactured by Keyence Corporation, and the distance along the Y-axis direction between the vertices of adjacent convex portions is measured.
- the measurement is performed with the center of the certain width in the Y-axis direction as the vertex. And 10 distances along the Y-axis direction between the vertices of adjacent convex portions are measured, and the average value is defined as the distance between the top of the convex portion and the top of another convex portion adjacent to the convex portion. .
- FIGS. 5 to 8 show an example of a manufacturing apparatus for manufacturing the nonwoven fabric 1.
- the manufacturing apparatus 50 has a nonwoven fabric 51 to be processed to be processed into the nonwoven fabric 1 wound in a roll shape.
- An unwinding device 52 for unwinding the target non-woven fabric 51 in the conveying direction MD and a preheating device 61 for preheating the non-woven fabric 51 to be processed formed by the unwinding device 52 are provided.
- the shaping apparatus 62 which performs the shaping process for extending
- Examples of a method for producing a nonwoven fabric to be processed that is unwound by an unwinding device include a method of forming a web (fleece) and physically and chemically bonding fibers.
- a method of forming a web For example, a spun bond method, a dry method (a card method, a melt blown method, an airlaid method, etc.), a wet method and the like can be mentioned.
- the bonding method include a thermal bond method, a chemical bond method, a needle punch method, a stitch bond method, Examples include the spunlace method.
- the fibers used for the nonwoven fabric to be processed can be made of fibers having high opacity, especially whitening properties, from the viewpoint of concealment of excretion fluid when used for absorbent articles.
- a permeation inhibitor may be used.
- An example of the light transmission inhibitor is an inorganic filler.
- this inorganic filler for example, titanium oxide, calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, magnesium sulfate, barium sulfate, calcium sulfate, aluminum hydroxide, magnesium hydroxide, zinc oxide, oxidation Examples include calcium, alumina, mica, glass powder, shirasu balloon, zeolite, and silicate clay.
- thermoplastic resin fibers antioxidants, light stabilizers, UV absorbers, neutralizers, nucleating agents, epoxy stabilizers, lubricants, antibacterial agents, flame retardants, antistatic agents, pigments, plasticizers, etc. These additives may be added as necessary.
- the thermoplastic resin fiber is preferably hydrophilized with a surfactant, a hydrophilic agent or the like.
- the basis weight of the nonwoven fabric to be processed is usually 10 to 100 g / m 2 , preferably 15 to 75 g / m 2 , more preferably 20 to 50 g / m 2 .
- the thickness of the nonwoven fabric to be processed is usually from 0.1 to 5 mm, preferably from 0.5 to 3 mm, more preferably from 0.8 to 2 mm.
- the preheating device 61 includes a pair of upper and lower heating rolls 61a and 61b, and the non-woven fabric 51 to be processed which has been conveyed is wound around the rotating lower heating roll 61b. After the surface is heated, the surface is transferred to the rotating upper heating roll 61a, and the heating roll 61a can heat the surface of the nonwoven fabric 51 to be processed which is not heated by the lower heating roll.
- the shaping device 62 includes a pair of upper and lower stretching rolls 63, 64. As shown in FIG. 6, the upper stretching roll 63 is disposed at regular intervals in the roll width direction.
- the lower stretching roll 64 includes a plurality of pins 64a provided on the outer peripheral surface so as to mesh with the concave groove 63b of the upper stretching roll 63, and a recess 64b meshing with the protruding ridge 63a.
- the pins 64 a are arranged at regular intervals so as not to contact the ridges 63 a of the upper stretching roll 63 in the roll width direction, and with respect to the circumferential direction of the roll.
- the lower stretching roll 64 in this embodiment has a configuration in which a plurality of pins 64 a are arranged in a staggered manner on the outer peripheral surface of the lower stretching roll 64.
- the preheating process which pre-heats with respect to the nonwoven fabric 51 processed from the unwinding apparatus 52, and Then, a forming step of stretching and shaping the nonwoven fabric 51 to be processed after the preheating step is sequentially performed.
- the preheating step the nonwoven fabric 51 to be processed that has been unwound from the unwinding device 52 and transported along the transporting direction MD is placed on the outer peripheral surface of the pair of upper and lower heating rolls 61a and 61b rotating the preheating device 61.
- the preheating temperature depends on the type of thermoplastic resin fiber constituting the nonwoven fabric to be processed, for example, it is heated at a temperature not lower than the melting point and above the temperature at which the thermoplastic resin fiber used in the nonwoven fabric to be processed begins to soften. It is preferable to do.
- the temperature of the outer peripheral surface of the heating roll is preferably about 60 to 120 ° C.
- the non-woven fabric 51 to be processed which has been conveyed through the preheating step, is inserted between the pair of upper and lower drawing rolls 63 and 64 that rotate while meshing in the shaping device 62, and the processing target
- the non-woven fabric 51 is stretched between the protruding ridge 63a and the concave groove 63b of the upper extending roll 63 engaged with each other, and the concave portion 64b and the pin 64a of the lower extending roll 64 are shaped.
- the heating temperature at this time is preferably higher than the preheating temperature in the preheating step and lower than the melting point temperature of the nonwoven fabric 51 to be processed.
- the upper drawing roll 63 pushes the portion where the ridge 63a is in contact with the nonwoven fabric 51 to be processed into the concave portion 64b of the lower drawing roll 64, thereby shaping the convex portion 4.
- the lower drawing roll 64 has the same non-woven fabric 51 to be processed in which the plurality of pins 64 a arranged in a line in the circumferential direction are in contact with the tip portions of the pins 64 a as the same as the upper drawing roll 63. Push into the groove 63b. At this time, a portion of the nonwoven fabric 51 to be processed that is pulled into the concave groove 63 b in a non-contact state with the pin 64 a becomes the groove portion 5.
- the portion that has been in contact with the tip portion of the pin 64a is strongly pushed into the concave groove 63b and shaped, whereby the first peripheral wall portion 19 extending in the direction in which the convex portion 4 and the groove portion 5 are extended. And the 2nd surrounding wall part 20 extended in a roll width direction, and the 2nd recessed part 16 which has the 2nd bottom part 18 will be formed.
- the portion of the tip 64a that is in contact with both ends in the width direction (roll width direction) of the pin 64a is the direction in which the ridge 63a passes the nonwoven fabric 51 to be processed below the drawing roll 64.
- the pin 64a scrapes the thermoplastic resin fibers forming the first peripheral wall portion 19 or breaks the fibers to form the broken fibers 23 having the broken end portions 23a. Or Thereby, the hole 21 having the peripheral edge portion 22 including the broken end portion 23a of the broken fiber 23 is formed in the second concave portion 16.
- the hole 21 is formed in the peripheral wall portion 17 in the direction along the conveyance direction MD of the nonwoven fabric 51 to be processed, that is, in the direction along the rotation direction of the stretching rolls 63 and 64, and is convex. Since it is a part along the direction where the part 4 and the groove part 5 are extended, the hole part 21 is formed in the 1st surrounding wall part 19 along the direction where the convex part 4 and the groove part 5 are extended.
- the nonwoven fabric for which the shaping process has been completed is completed as the nonwoven fabric 1 for absorbent articles with the convex portions 4 and the groove portions 5 formed.
- This non-woven fabric 1 is then used on a part that touches the skin, such as a top sheet of an absorbent article such as a disposable diaper, sanitary napkin, incontinence pad, panty liner, or a leakproof wall, or outside the back sheet of the disposable diaper. It will be affixed to the surface.
- the nonwoven fabric 1 for absorbent articles having the above-described configuration has a convex portion because the average fiber diameter of the fibers 4b forming the convex portion 4 is smaller than the distance between adjacent protruding portions 31 in the fingerprint of the finger 30 of the hand.
- the fibers 4b forming 4 can be inserted between the adjacent protrusions 31 of the fingerprint.
- the distance between the top part 4a of the convex part 4 of the nonwoven fabric 1 and the top part 4a of the other convex part 4 which adjoins the convex part 4, and the average interfiber distance of the fiber 4b which forms the convex part 4 are predetermined.
- the convex part 4 as a whole can easily follow the finger 30 and the unevenness of the fingerprint of the finger 30, so that the fibers 4 b forming the convex part 4 are adjacent to each other in the fingerprint of the finger 30 of the hand. It becomes easier to enter the protrusions 31, 31. Furthermore, since the area where the first bottom portion 12 of the first concave portion 11 is in contact with the skin is suppressed due to the presence of the second concave portion 16, a soft touch can be obtained.
- the nonwoven fabric 1 as a whole can have a soft touch
- the fibers 4b forming the convex portions 4 can be formed by the flat portions 32 between the fingerprint protruding portions 31 and 31 of the fingers 30 of the hand 30 or the side portions 31a of the protruding portions 31.
- a delicate and soft feel and a smooth feel can be obtained.
- the convex portion 4 is a fiber in which the hole portion 21 of the first peripheral wall portion 19 of the peripheral wall portion 17 releases the tension of the fibers forming the adjacent convex portions 4 and the entire convex portion 4 or the convex portion 4 is formed. Since the freedom degree which 4b moves is improved, the softness
- the first peripheral wall portion 19 of the second recess 16 includes the hole portion 21 that penetrates between the first surface 2 and the second surface 3, but this hole portion is not necessarily provided. Also good.
- the hole 21 is provided in the first peripheral wall 19, but the hole may be provided in a pair of second peripheral walls formed along the second direction. The structure provided in any one surrounding wall part may be sufficient.
- the hole part 21 is arrange
- the flexibility and rigidity of the nonwoven fabric can be arbitrarily set as long as they are not impaired.
- thermoplastic resin fiber 24 spanned exists in the internal space 21a of the hole 21
- rupture fiber does not need to extend in the internal space of a hole like the said embodiment.
- the second recess 16 is formed in a substantially rectangular parallelepiped shape, but the shape of the second recess can be any shape such as a columnar shape or a prismatic shape.
- the convex part 4 is extended in the 1st direction X of the nonwoven fabric 1 continuously.
- a convex part does not necessarily extend continuously in the 1st direction of a nonwoven fabric, and may be intermittent.
- the fibers 4b forming the convex portions 4 of the nonwoven fabric 1 have an average fiber diameter of 10 to 30 ⁇ m and an average interfiber distance of 50 to 150 ⁇ m, but form other portions such as grooves in the nonwoven fabric.
- the fibers can also have an average fiber diameter and an average inter-fiber distance range that are equivalent to the fibers forming the convex portions.
- Example 1 and Example 2 two types of samples made of the nonwoven fabric according to the present invention and three types of samples that are not the nonwoven fabric according to the present invention (hereinafter referred to as Comparative Example 1 and Comparative Example 2). , Referred to as Comparative Example 3).
- the said sample used what cut out the nonwoven fabric used as experiment object in 100 mm x 100 mm.
- the nonwoven fabric which concerns on this invention has the structure fundamentally the same as what was demonstrated in the said embodiment, and was manufactured with the same manufacturing method.
- the distance between the top of the convex portion and the top of another convex portion adjacent to the convex portion (pitch; hereinafter referred to as “distance between convex portions”), and The average fiber diameters of the fibers forming the convex portions are different from each other.
- the nonwoven fabric which concerns on the comparative example 1 in the said embodiment, it is corresponded to the nonwoven fabric of the process target used in the case of manufacture of the nonwoven fabric which concerns on this invention, is not shaped, and is substantially flat as a whole. It is an aspect.
- the whole average fiber diameter is the same as the average fiber diameter of the fiber which forms a convex part in Example 1.
- FIG. 2 the nonwoven fabric which concerns on the comparative example 2, in the said embodiment, it was shape
- the manufacturing method of the nonwoven fabric which concerns on this comparative example 2 about elements other than the shape of shaping, it is as substantially the same as Example 1 and Example 2 fundamentally.
- the nonwoven fabric which concerns on this comparative example 2 is the same as Example 1 in the average fiber diameter of the fiber which forms a convex part,
- the structure of a nonwoven fabric and the distance between convex parts are different from Example 1.
- FIG. 3 although the nonwoven fabric which concerns on the comparative example 3 has the fundamentally same structure as what was demonstrated in the said embodiment, and manufactured with the same manufacturing method, the average fiber diameter of the fiber which forms a convex part is this invention.
- the fibers constituting the nonwoven fabric are also different from those in Example 1 and Example 2.
- the distance between the convex parts of the comparative example 3 is the same as that of the example 1.
- Example 1 Example 2, Comparative Example 1, and Comparative Example 2
- the nonwoven fabric was formed of PET / PE core-sheath type composite fiber (basis weight 30 g / m 2 ), and for Comparative Example 3, A nonwoven fabric made of PET / PP core-sheath type composite fiber (basis weight 30 g / m 2 ) is used.
- Examples 1 and 2 and Comparative Examples 1 to 3 are all through-air nonwoven fabrics.
- the heating temperature is 100 ° C. in the preheating step and the shaping step. And shaping was carried out at a conveyance speed of 250 m / min.
- Example 1 As can be seen from Table 1, in Example 1, all of the subjects felt “moist” and many in Example 2 also felt “moist”. No one felt that. However, in the comparison between Example 1 and Example 2, there were many people who felt that the texture of Example 1 was “moist”, but this is because the distance between the convex portions of Example 2 is within the scope of the present invention. Thus, it is considered that Example 1 in which the distance between the convex portions is far from the upper limit value and the lower limit value of the range of the present invention was more easily felt as “moist”. On the contrary, in Comparative Examples 1 to 3, all of the subjects did not feel “moist”.
- the average fiber diameter is within the scope of the present invention, but the basic structure of the nonwoven fabric of the present invention (in this example, the elements related to the basic shape of the nonwoven fabric (the distance between (It means the structure of the non-woven fabric having the first concave portion and the second concave portion in the convex portion and the groove portion) other than the average fiber diameter of the fibers forming the portion. It is thought that the touch was not obtained.
- the basic structure of the nonwoven fabric of the present invention is not provided, and the distance between the convex portions is outside the scope of the present invention.
- the average fiber diameter is within the scope of the present invention, it does not have the basic structure of the nonwoven fabric of the present invention, and the distance between the convex portions is not within the scope of the present invention, so that it is "moist” It is thought that the touch cannot be obtained.
- the comparative example 3 although it has the same basic composition as this invention, since the average fiber diameter of the fiber which forms a convex part is outside the range of this invention, the touch made into "moist” is obtained. It is thought that there was not. As described above, according to the nonwoven fabric for absorbent articles of the present invention, it was demonstrated that a “moist” feel can be obtained.
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Abstract
Description
そのため、近年では、肌と接触する面に、複数列の凸部と、隣り合う凸部の間の空間に設けられた溝部とが設けられた不織布が用いられることが多くなっているが、このような不織布は、比較的柔軟な凸部が肌に接触し、またその凸部が肌面にフィットし易いため、不織布の柔軟性を感じ易い傾向にある。
(1)第1面と前記第1面とは反対側の第2面とを有し、前記第2面から前記第1面の方向に向けて突出する複数の凸部と、前記第1面から前記第2面の方向に向けて窪んだ複数の溝部とを備えた、熱可塑性樹脂繊維を含む吸収性物品用不織布であって、前記凸部は、前記不織布の平面方向における第1方向に向けて延設されていると共に、前記不織布の平面方向において前記第1方向と直交する第2方向に予め定めた間隔で設けられ、前記溝部は、前記第2方向に対して相互に隣り合う前記凸部の間の空間に、前記第1方向に向けて延設されていて、前記凸部の頂部における前記第1面の位置よりも第2面の方向に位置する第1底部を備えた第1凹部と、前記第1凹部内において前記第1方向に不連続に設けられ、前記第1底部に開口する窪み状に形成された、前記第1底部よりも前記第2面の方向に位置する第2底部を備えた複数の第2凹部とを有し、前記凸部の頂部とその凸部と隣り合う他の前記凸部の頂部との間の距離が0.5~2mmであり、前記不織布において少なくとも前記凸部を形成する繊維の平均繊維径が10~30μmである、吸収性物品用不織布。
これにより、前記凸部を形成する繊維を、手の指の指紋の凹凸に沿わせ易くなるため、前記凸部を形成する繊維を、突起部間により安定的に入り込ませることができ、より肌になじみ易い、しっとりした感触を得ることができる。
これにより、肌に対する前記第1凹部の前記第1底部の接触面積をより安定的に抑えることができ、柔軟な感触を付与することができる。また、周壁部により前記第2底部は前記凸部から離れた位置に存在することとなるため、前記第1面に肌が触れた際には、前記第2底部が肌に触れにくく、前記第1面の滑らかな肌触りを確保することができる。
これにより、前記周壁部の前記第1周壁部の前記孔部が、隣り合う前記凸部を形成する繊維の張力を解放するため、前記凸部の全体あるいは前記凸部を形成する繊維が移動する自由度を向上させることができる。この結果、前記凸部の柔軟性をより向上させることができる上、前記凸部の繊維を指の指紋の凹凸に追従させ易くなり、繊細で柔らかな、肌になじみやすい感触をより安定的に得ることができる。
これにより、肌が前記孔部の周縁部に触れたとしても、この周縁部には溶融により硬化した熱可塑性樹脂繊維が存在しないため、ごわつきや繊維の引っ掛かりによる違和感が抑えられ、不織布に対して硬さや粗さを感じることが抑止される。
これにより、仮に肌が孔部に触れた場合であっても、内部空間内の熱可塑性樹脂繊維が、第2凹部の第1周壁部や第2底部と孔部との間の境目や段差を小さくすることができる。これにより、孔部が存在していても、滑らかな肌触りが維持することができるため、この孔部の存在に起因する触れた際の違和感を少なくすることができる。
これにより、凸部や凸部の繊維に適度な自由度を付与して柔軟性を確保することができる一方で、孔部が設けられている第1周壁部の強度を確保し、且つ孔部の周縁部に触れた際の違和感を抑えることができる。
これにより、孔部を、肌が触れやすい凸部や第1底部からできるだけ遠ざけることができるため、孔部が肌に触れる機会を極力減らし、孔部による違和感あるいは異物感を減らすことができる。この結果、肌を不織布の平面方向に滑らせた際の滑らかさをより安定的に確保することができる。
これにより、前記第2底部の形成時において繊維密度を確保してその第2底部の剛性の低下を抑えると共に、第2凹部の周壁部の剛性を確保して、不織布全体の強度を確保することができる。
なお、この実施形態においては、凸部4が突出する方向を上方、凸部が突出する方向と反対側の方向を下方として説明する。
なお、本発明の不織布が吸収性物品に使用される場合には、この不織布の第2面が吸収性物品の各構成部材(例えば、トップシートとして使用される場合には吸収体)に接合される。このとき、凸部(特に頂部)の第2面側は接合しないことがきわめて好ましい。
凸部4は、不織布1の平面方向(シート面)における第1方向Xに向けて連続的に延設されていると共に、第2方向Yに予め定めた間隔で複数列設けられている。この実施の形態においては、各凸部4は、いずれも第1方向Xに向けて連続的に、且つ他の凸部4と相互にほぼ平行となるように延設されている。
この溝部5は、凸部4の頂部4aにおける第1面2の位置よりも第2面3の方向、即ち下方に位置する第1底部12を備えた第1凹部11と、第1凹部11内において第1方向Xに不連続に設けられ、第1底部12に開口する窪み状に形成された複数の第2凹部16とを有している。
さらに、この第2凹部16は、第1底部12から凸部4が突出する方向とは反対側の方向である下方に向けて延設された、立壁状の周壁部17と、この周壁部17における第1底部12とは反対側の端部、即ち下方側の端部に、その端部を塞ぐように設けられた、第1底部12よりも第2面3の方向、即ち下方に位置する第2底部18とを備えている。
さらに、この第2底部18の第1面2(即ち、第2凹部16の内部側の面)及び第2面3は、全体としてほぼ面状に形成されている。
即ち、本発明に係る不織布は、例えば吸収性物品にトップシートとして使用される場合は、この不織布の第2面が吸収性物品の吸収体に接合されるが、その状態においては、凸部、次いで第1凹部の第1底部の順に肌に触れ易くなる。このとき、凸部(特に頂部)は、吸収体にほとんど接合されず、柔軟性も高まることから、第1底部よりも凸部が肌に触れる機会が多いことが好ましい。一方で、トップシート等に使用される不織布としては、不織布全体として肌に触れる接触面積が少ない方が柔軟性を感じ易い。
そのため、本発明においては、第2凹部を設けて第1底部が存在しない部分を形成することにより、第1凹部の第1底部において肌に接する部分をより小さくし、肌が第1底部に当たる機会を可及的に少なくして凸部に触れ易くすると共に、仮に肌が第1底部に接する場合であってもその接触面積が可及的に少なくなるようにしている。
さらに、第2凹部を第1底部に設けたのは、第2凹部を、凸部に比べて肌に触れにくい第1凹部の第1底部に設けることにより、凸部と第2底部との間の距離を確保してその第2凹部が肌に触れる機会をできるだけ少なくするためである。これにより、他の部分に比べて繊維密度が高く剛性も高い第2凹部に触れることによる違和感や異物感をできるだけ抑えることができる。
第1凹部の第1底部の第1面の高さから第2凹部の第2底部の第1面の高さまでの大きさが0.05mm未満であると、第2底部の形成時において繊維密度が低くなって剛性を確保しづらくなり、不織布の厚み方向の強度が不足する可能性がある。逆に2mm超であると、第2底部を吸収性物品の他の部材、例えば吸収体や他の不織布、フィルム等と貼り合わせた際、第2凹部の周壁部が長く延びすぎて不織布の厚さ方向の強度が出ない一方で、圧縮した際に硬さを感じてしまう可能性がある。
また、第2凹部と凸部との関係について、第1凹部の第1底部の第1面の高さから第2凹部の第2底部の第1面の高さまでの大きさは、第1凹部の第1底部(この場合、最も第2底部に近い位置)の第1面の高さから凸部の頂部の第1面側の高さまでの大きさの10~80%であることが好ましく、さらに好ましくは15~70%、より好ましくは20~60%とすることである。
第1凹部の第1底部の第1面側の高さから第2凹部の第2底部の第1面側の高さまでの大きさが、第1凹部の第1底部の第1面側の高さから凸部の頂部の第1面側の高さまでの大きさの10%未満であると、周壁部おける孔部の形成スペースが十分に確保できず、孔部の形成が不十分となって凸部、延いては不織布としての柔軟性を得られない。逆に80%を超えると、第2凹部が深くなりすぎて周壁部の強度が低下し毛羽立ち易くなるため、肌触りが低下する可能性がある。
第2凹部の第1方向や第2方向の長さが0.25mm未満であると、第2凹部が小さくなりすぎて第2底部の形成が不十分になるため、第2凹部がほとんど機能しない可能性がある。逆に5mm超であると、第2凹部が大きくなりすぎて、凹部による違和感や異物感を肌で感じ易くなる可能性がある。
そして、図1及び図3に示すように、一対の第1周壁部19,19には、第1凹部11の内部空間から第2面3に通じる孔部21がそれぞれ形成されている。
この実施の形態においては、孔部21は、一対の第1周壁部19,19のそれぞれに1つずつ設けられていて、それらの孔部21は、第1周壁部19における第2底部18寄りの位置に形成されたものとなっている(したがって、1つの第2凹部16には2つの孔部21が存在している。)。一方で、一対の第2周壁部20,20は、孔部21に相当するものは存在せず、第2周壁部20は第2底部28と直接的に連結されている。
逆に、孔部21を第2周壁部20に設けていないのは、不織布1の第1方向X、即ち凸部4や溝部5が延びている方向に肌を滑らせた場合に、第2凹部16の存在による段差が肌に引っ掛かるのを抑止して、不織布1の第1方向Xへの滑らかさを確保するためである。即ち、第2周壁部20については、第1底部12及び第2底部18と連続し、継ぎ目なく一体となっているため、肌を不織布1の第1方向Xに滑らせた場合には、肌は第2凹部16の存在による第1底部12の段差をあまり感じることなく凸部4や溝部5に沿って滑らかに移動し易い。これにより、凸部4の柔軟性や繊維の柔軟性を生かした不織布1の第1方向Xへの滑らかさを確保することできる。
また、孔部21を第1周壁部19における第2底部18寄りの位置に設けたのは、孔部21を、肌が触れやすい凸部4や第1底部12からできるだけ遠ざけることにより、孔部21が肌に触れる機会を極力減らし、違和感あるいは異物感を感じにくくするためである。これにより、肌を不織布1の平面方向に滑らせた際の滑らかさをより安定的に確保することができる。
この結果、仮に肌が孔部21の周縁部22に触れたとしても、この周縁部22には溶融により硬化した熱可塑性樹脂繊維が存在しないため、ごわつきや繊維の引っ掛かりによる違和感が抑えられると共に、不織布1の硬さや粗さを感じることが抑止される。
なお、このときの孔部の内部空間の開孔率は、1~50%とすることが好ましく、さらに好ましくは1.5~35%、より好ましくは2.5~20%とすることである。
孔部の内部空間の開孔率が1%未満であると、開孔率が低すぎて凸部や凸部の繊維に自由度を付与することができず、凸部の十分な柔軟性を確保できない。逆に50%を超えると孔部が設けられた第1周壁部の強度が低くなり易い上、孔部の周縁部の境目が触感上分かり易くなる可能性がある。ただし、孔部の内部空間の開孔率については、吸収性物品の種類や用途等によっては、前記範囲以外であってもよく、任意に設定することができる。
孔部の最大部分の長さが0.25mm未満であると孔部の形成が不十分であり、第2凹部の柔軟性が確保できない上、凸部の繊維の張力が低下せずに凸部の十分な柔軟性が確保できない。逆に、5mm超であると孔部が大き過ぎて孔部の周縁部が毛羽立ち易くなり、かえって孔部による違和感や異物感が生じ易くなるため、不織布の肌触りを低下させるおそれがある。
一方、孔部の高さ方向の最大長さは、第2凹部の深さにもよるが、0.1~5mmであることが好ましく、さらに好ましくは0.25~3mm、より好ましくは0.5~2mmとすることである。
孔部の高さ方向の最大長さが0.1mm未満であると、孔部の形成が不十分であり、この場合であっても、第2凹部の柔軟性が確保できない上、凸部の繊維の張力が低下せずに凸部の十分な柔軟性が確保できない。逆に、5mm超であると、やはり孔部の周縁部が大き過ぎて周縁部が毛羽立ち易くなり、孔部が違和感や異物感を生じさせ易くなるため、不織布の肌触りを低下させる可能性がある。
本発明において、凸部を形成する繊維の平均繊維径を10~30μmとしたのは、凸部に指の皮膚が触れた際に、繊細で柔らかく、肌になじみ易くてしっとりした感触を得ることができるようにするためである。この凸部を形成する繊維の平均繊維径は、繊細で柔らかく、肌になじみ易くてしっとりした感触の不織布を得るための非常に重要な要素である。
即ち、人間は、物の表面を指で触れた際に、その物の表面の凹凸における隣り合う凸状部分間の距離(ピッチ)と、指の指紋の隣り合う突起部間の距離との関係によって、その物の表面がすべすべしているか、ザラザラしているかを知覚するといわれている。即ち、物の表面の凸状部分が、指の指紋の突起部間に入り込んで、その指紋の突起部間の窪みである平坦部分や、突起部の先端以外の側面部分等を刺激すると、指の触覚器官が刺激されて、繊細で柔らかく、すべすべした感触が得られる。
一般に、人間の指の指紋は、隣り合う突起部間の距離が460±15μm程度といわれている。そのため、本発明においては、不織布において最も肌に触れ易い凸部を、この指紋における隣り合う突起部間の距離よりも十分に小さい平均繊維径の繊維により形成し、不織布の凸部を指で触った際に、凸部を形成する繊維が指の指紋の突起部間に入り込み易くしている。
この結果、凸部4を形成する繊維4bの複数が、指30の平坦部分32や、突起部31の側面部分31aに接触し、指30の触覚器官を刺激するため、繊細で柔らかく、肌になじみ易いしっとりとした感触が得られることとなる。
なお、凸部を形成する繊維の平均繊維径としては、10~20μmとすることがより好ましい。
本発明において、凸部を形成する繊維の平均繊維間距離を50~150μmとしているのは、前記凸部を形成する繊維の位置を、指の指紋における隣り合う突起部の間に距離に一層適合し易くして、前記凸部を形成する繊維をできるだけ指の指紋の凹凸に沿わせるように接触させるためである。これにより、その繊維をより安定的に且つ確実に指の指紋の突起部間に入り込ませることができるため、凸部を指で触った際に、肌になじみ易くてしっとりとした感触をより確実且つ安定的に得ることができる。
凸部を形成する繊維の平均繊維間距離が50μm未満であると繊維間距離が近くなりすぎてしまい、結果として繊維が動きにくくなることから、凸部を形成する繊維を手の指の指紋の凹凸に沿わせにくくなる。逆に、150μmを超えると、凸部を形成する繊維が手の指の指紋における隣り合う突起部の間に入り込みにくくなり、また入り込める繊維の数も少なくなることから、繊細な感覚を得づらく、肌になじみ易い間隔が損なわれる可能性がある。
なお、凸部を形成する繊維の平均繊維間距離は、60~130μmがより好ましく、さらに好ましくは70~110μmとすることである。
1)測定対象物である不織布を24mm×15mmにカットして、測定用サンプルを作製する。この測定用サンプルは、3枚作製する。
2)3枚の測定用サンプルを、互いに重なり合わないようにして水銀ポロシメーター(株式会社島津製作所製)のサンプルセルにセットした後、水銀に加える圧力を徐々に変化させながら、不織布の構成繊維間の空間(すなわち、細孔)内に押し込まれた水銀の体積(すなわち、細孔容積)を測定する。なお、測定は、22℃、65%RHの環境下で行う。
3)下記の式(1)に従って前記細孔の孔径D(μm)(すなわち、不織布の繊維間距離(μm))を算出し、前記孔径Dと前記細孔容積との関係を、前記孔径Dの分布曲線(微分・積分曲線)として得る。なお、下記の式(1)における各種測定条件は、水銀の表面張力が0.483N/m、接触角が130°、水銀圧力が0~414MPa(絶対圧)である。
4)得られた孔径Dの分布曲線から、孔径Dが0~500μmである細孔の合計容積に対する、孔径Dが50~150μmである細孔の容積の割合を算出する。
5)上記2)~4)の操作を3回行い、得られた容積の割合の平均値を、50~150μmの繊維間距離が全体に占める割合(%)とする。
即ち、測定対象の不織布を5cm四方の四角形形状にカットしたものを試料とし、マイクロスコープ(KEYENCE製 VHX-2000、レンズ VH-Z20W絞り開放)の3D画像連結機能を用いて、この試料の表面から深度100μmまで焦点が一致している200倍拡大画像を得、その拡大画像を基に焦点が一致している繊維の外側を抽出し、そこに形成された面を繊維空間とする。前記マイクロスコープの面積測定機能を用いて繊維空間の占める面積を求める。このとき、試料の任意の場所を任意に選択し、その選択した範囲の繊維空間の面積を100箇所測定する。その選択した範囲における繊維空間1つ当たりの面積A〔繊維空間面積(平均値)〕より、下記式(2)によって繊維空間径(r)を求め、前記繊維空間径(r)を繊維間距離とする。
本発明において、凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離を0.5~2mmとしたのは、手の指が不織布に触れた際に、凸部と凸部との間に入り込ませた指紋の突起部のほぼすべてを、その凸部と凸部との間において不織布に確実に接触させて、突起部の側面部分等を刺激し易くするためである。この凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離も、前述の凸部を形成する繊維の平均繊維径と並んで、繊細で柔らかく、肌になじみ易くてしっとりした感触の不織布を得るための非常に重要な要素である。
即ち、不織布に指で触れた者がその不織布に対して、繊細で柔らかく、肌になじみ易くてしっとりとした感触を感じるか否かは、手の指の指紋の突起部の側面部分等が刺激されるか否かが問題となる。また、突起部の側面部分等への刺激は、凸部を形成する繊維が指の指紋の突起部間に入り込んだ場合はもちろんであるが、指が不織布に触れた際に指紋の突起部の側面部分等が不織布の表面に直接的に触れた場合にも起こりうる。
手の指が不織布に触れた場合、その指は凸部だけでなく凸部と凸部との間に入り込むことが多いが、その際、指紋の突起部も凸部と凸部との間に入り、ほぼすべての凸部(特に側面部分等)に対して刺激を与えることができれば、不織布に対して、繊細で柔らかく、肌になじみ易くてしっとりとした感触が安定的に得られる。
ここで、前述のように、人間の手の指の指紋において、隣り合う突起部間の距離は460±15μm程度であるため、凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離が0.5mm未満であると、指紋の突起部が凸部と凸部との間に入り込みにくく、まったく入り込まない場合が考えられる。また、凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離が2mmを超えると、複数の指紋の突起部が凸部と凸部との間に入り込むことができるものの、例えば溝部の一番深い場所等、場所によっては、指紋の突起部が不織布に接触しづらくなる場合がある。そうすると、指紋の突起部、特に突起部の側面部分への刺激が弱いあるいは刺激できない可能性があるため、凸部と凸部との間に入り込んだ突起部ほぼすべてをうまく刺激できずに、不織布に対して、繊細で柔らかく、肌になじみ易くてしっとりとした感触が得られない場合がある。
そのため、本発明においては、凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離を0.5~2mmとした。
逆に、凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離が2mmを超えると、凸部の頂部と隣り合う凸部の頂部との距離が大きすぎて、不織布の第1面を指でなぞった際に、指が第1凹部に触れてしまう可能性が高くなり、結果として、繊維密度が高く剛性も高い第2凹部の第2底部に触れる機会が多くなってしまい、柔軟な感触が損なわれ、肌になじみにくい。
鋭利な刃物を準備(例えば、コクヨ株式会社製のカッターナイフHA-7NB(商品名)用の標準替え刃HA-100NB等)し、不織布を裁断する。
裁断後、24時間以上放置したのち、シートの断面をキーエンス社製のマイクロスコープで5倍に拡大し、隣り合う凸部の頂点間のY軸方向に沿う距離を測定する。このとき、凸部の頂点がY軸方向に一定の幅を持つ場合には、その一定の幅のY軸方向の中心を頂点とし測定を行なう。
そして、隣り合う凸部の頂点間のY軸方向に沿う距離を10箇所測定し、その平均値を凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離とする。
図5~図8は、不織布1を製造する製造装置の一例を示すもので、この製造装置50は、不織布1とするための加工を行う加工対象の不織布51がロール状に巻かれ、その加工対象の不織布51を搬送方向MDに向けて巻き出す巻出装置52と、巻出装置52によって形成された加工対象の不織布51に予熱を与える予熱装置61とを備えている。さらに、予熱を与えた加工対象の不織布51を延伸して凸部4及び溝部5(第1凹部11及び第2凹部16を含む)を形成するための賦形加工を行う賦形装置62とを備えている。
また、加工対象の不織布に用いる繊維は、吸収性物品に用いたときの排泄液の隠ぺい性の観点から、不透明性、特には白化性の高い繊維を用いることができ、例えば、不透明化させる光線透過抑制剤を用いてもよい。この光線透過抑制剤としては、無機フィラーを例示できる。この無機フィラーとして、例えば、酸化チタン、炭酸カルシウム、タルク、クレー、カオリン、シリカ、珪藻土、炭酸マグネシウム、炭酸バリウム、硫酸マグネシウム、硫酸バリウム、硫酸カルシウム、水酸化アルミニウム、水酸化マグネシウム、酸化亜鉛、酸化カルシウム、アルミナ、マイカ、ガラス粉、シラスバルーン、ゼオライト、及び珪酸白土等を例示することができる。これらは2種類以上を組み合わせて含有させても良い。特に、一般に繊維製造段階の工程性等の面から、二酸化チタンが好ましい。
また、熱可塑性樹脂繊維については、酸化防止剤、光安定剤、紫外線吸収剤、中和剤、造核剤、エポキシ安定剤、滑剤、抗菌剤、難燃剤、帯電防止剤、顔料、可塑剤等の添加剤を必要に応じて添加してもよい。熱可塑性樹脂繊維は、界面活性剤、親水剤等により親水化処理されていることが好ましい。
また、賦形装置62は、上下一対の延伸ロール63,64を備えていて、図6に示すように、上方の延伸ロール63は、ロール幅方向に一定の間隔で配設された、この上方の延伸ロール63の外周面に沿って相互に平行に複数列設けられた突稜63aと、隣り合う突稜63a,63aの間に設けられた複数列の凹溝63bとを備えている。
一方、下方の延伸ロール64は、外周面に、上方の延伸ロール63の凹溝63bと噛み合うように設けられた複数のピン64aと、突稜63aと噛み合う凹部64bとを備えている。図6に示すように、ピン64aは、ロール幅方向に対しては、上方の延伸ロール63の突稜63aと接触しないように一定の間隔で配設されていると共に、ロールの周方向に対しては、外周面に沿って一定の間隔でほぼ直線的に配設されている。また、図7に示すように、この実施の形態における下方の延伸ロール64は、複数のピン64aが、下方の延伸ロール64の外周面に千鳥状に配設された構成となっている。
予熱温度は、加工対象の不織布を構成する熱可塑性樹脂繊維の種類にもよるが、例えば、加工対象の不織布に使用されている熱可塑性樹脂繊維の軟化が始まる温度以上、融点未満の温度で加熱することが好ましい。
予熱温度を融点以上とすると熱可塑性樹脂繊維が溶解し硬化するため、柔軟な肌触りが損なわれる。また、熱可塑性樹脂繊維の軟化が始まる温度未満であると、熱可塑性樹脂繊維同士の接合が維持されるため、次工程の賦形工程において加工対象の不織布を賦形しづらくなり、適切な凹凸が形成しにくくなる。例えばポリエチレンテレフタレート(PET)と高密度ポリエチレン(HDPE)との芯鞘型の複合繊維の場合、加熱ロールの外周面の温度を60~120℃程度とすることが好ましい。
一方で、下方の延伸ロール64は、周方向に一列に並んでいる複数のピン64aが、そのピン64aの先端部分に接触している加工対象の不織布51を、上方の延伸ロール63の同一の凹溝63b内に押し込む。このとき、加工対象の不織布51のうち、ピン64aと非接触状態で凹溝63b内に引っ張られた部分は溝部5となる。また、ピン64aの先端部分と接触していた部分は、凹溝63b内に強く押し込まれて賦形され、これにより、凸部4及び溝部5が延設される方向に延びる第1周壁部19、及びロール幅方向に延びる第2周壁部20、並びに第2底部18を有する第2凹部16が形成されることとなる。
なお、第2凹部16の第2底部18については、形成時において、上方の延伸ロール63と下方の延伸ロール64とが加工対象の不織布51を噛み込んだ状態で、ピン64aの先端部分がその加工対象の不織布51の当接部分を凹溝63b内に押し込むため、実質的に繊維密度が他の部分よりも高くなり、剛性が向上する。したがって、不織布1はこの第2凹部16の第2底部18の作用により、不織布1全体の剛性が向上することとなる。
これにより、第2凹部16に、破断繊維23の破断端部23aが含まれた周縁部22を有する孔部21が形成されることとなる。なお、一部の熱可塑性樹脂繊維は、孔部21の内部空間21aに架け渡された状態(架け渡された熱可塑性樹脂繊維24)で残り、また、一部の破断繊維23の破断端部23aは内部空間21a内に延出した状態となる。
ここで、孔部21が形成されるのは、周壁部17のうち、加工対象の不織布51の搬送方向MDに沿う方向、即ち、延伸ロール63,64の回転方向に沿う方向であって、凸部4及び溝部5が延設される方向に沿う部分であることから、孔部21は凸部4及び溝部5が延設される方向に沿う第1周壁部19に形成される。
これにより、不織布1全体として柔軟な肌触りが得られる上、凸部4を形成する繊維4bが手の指30の指紋の突起部31,31間の平坦部分32や、突起部31の側面部分31aにある触覚器官を刺激するため、繊細で柔らかい感触及び滑らかな感触を得ることができる。
前記実施形態においては、孔部21が第1周壁部19に設けられているが、孔部は第2方向に沿うように形成された一対の第2周壁部に設けられていてもよく、また、いずれか1つの周壁部に設けられている構成であってもよい。
さらに、前記実施形態では、孔部21が第1周壁部19における第2底部18寄りの位置に配設されているが、周壁部における孔部の位置については、必ずしも底部寄りである必要はなく、不織布の柔軟性や剛性を損なわない範囲で任意に設定することができる。
この比較実験として、実施例と比較例とについて、被験者が手の指で不織布のサンプルの上面(凸部が突出している面)に触れ、そのサンプルの長さ方向及び幅方向になぞった際に、「しっとり」、「すべすべ」、「さらさら」、あるいは「その他」のうちのいずれの感触を感じるかを評価をしてもらい、その結果を比較した。
なお、この比較実験での官能評価にあたっては、「しっとり」とは肌になじみ、実際には湿っていないが、あたかも軽い湿り気があるように感じる肌触り、「すべすべ」とは手触りが滑らかでざらつきが少ない肌触り、「さらさら」とは湿り気がなく、乾いた感じの肌触りとして、それぞれの肌触りを区別することとした。また、「しっとり」の肌触りと「さらさら」の肌触りは相反する感触であり、「すべすべ」はこれらの「しっとり」と「さらさら」との中間の感触とした。
また、本発明に係る不織布は、前記実施の形態において説明したものと基本的に同じ構成を有し、同じ製造方法で製造した。また、実施例1と実施例2とは、凸部の頂部とその凸部と隣り合う他の凸部の頂部との間の距離(ピッチ。以下「凸部間の距離」という。)、及び凸部を形成する繊維の平均繊維径が相互に異なっている。
一方、比較例1に係る不織布については、前記実施形態において、本発明に係る不織布の製造の際に用いられる加工対象の不織布に相当するもので、賦形されておらず、全体としてほぼ平坦な態様となっている。この比較例1に係る不織布は、全体の平均繊維径が、実施例1において凸部を形成する繊維の平均繊維径と同じとなっている。
また、比較例2に係る不織布については、前記実施形態において、突稜と凹溝を有する相互に噛み合った一対の賦形ロールによって賦形したもので、断面略波型の凹凸状の態様となっている。なお、この比較例2に係る不織布の製造方法については、賦形の形以外の要素については、基本的に実施例1及び実施例2とほぼ同じである。また、この比較例2に係る不織布は、凸部を形成する繊維の平均繊維径は実施例1と同じであるが、不織布の構造及び凸部間の距離は実施例1と異なっている。
さらに、比較例3に係る不織布は、前記実施の形態において説明したものと基本的に同じ構成を有し、同じ製造方法で製造したが、凸部を形成する繊維の平均繊維径が、本発明の範囲に含まれていない態様となっていて、また不織布を構成する繊維も実施例1及び実施例2とは異なっている。なお、この比較例3の凸部間の距離は実施例1と同じである。
実施例1、実施例2、比較例1、比較例2については、不織布がPET/PE芯鞘型複合繊維(坪量30g/m2)により形成されたものを用い、比較例3については、不織布がPET/PP芯鞘型複合繊維(坪量30g/m2)により形成されたものを用いている。なお、実施例1,2、比較例1~3は、いずれもスルーエアー不織布であり、実施例1,2、比較例2,3については、予熱工程及び賦形工程においては加熱温度を100℃とし、搬送速度250m/minで賦形を行った。
また、凸部間の距離及び凸部を形成する繊維の平均繊維径は、前記実施の形態で述べた計測方法でそれぞれ計測した。
比較実験の結果を次表に示す。なお、表中の官能評価の欄中の1は「しっとり」、2は「すべすべ」、3は「さらさら」の評価を意味する。
逆に、比較例1~3については、被験者の全員が「しっとり」とした肌触りを感じなかった。比較例1については、平均繊維径が本発明の範囲内ではあるが、本発明の不織布の基本構造(この実施例においては、不織布の基本的な形状に係る要素(凸部間の距離及び凸部を形成する繊維の平均繊維径以外の要素)、即ち凸部、溝部における第1凹部及び第2凹部を有する不織布の構造を意味する。)を有していないことから、「しっとり」とした肌触りが得られなかったものと考えられる。
比較例2については、本発明の不織布の基本構造を備えていない上、凸部間の距離が本発明の範囲外であることから、例え凹凸構造を有する不織布であって、且つ凸部を形成する平均繊維径が本発明の範囲であったとしても、本願発明の不織布の基本構造を有しておらず、凸部間の距離が本発明の範囲内にないものからは「しっとり」とした肌触りが得られないと考えられる。
比較例3については、本願発明と同じの基本構成を有しているが、凸部を形成する繊維の平均繊維径が本発明の範囲外であることから、「しっとり」とした肌触りが得られなかったものと考えられる。
以上のように、本発明の吸収性物品用不織布によれば、「しっとり」とした肌触りを得ることができることが実証された。
2 不織布の第1面
3 不織布の第2面
4 凸部
4a 凸部の頂部
5 溝部
11 第1凹部
12 第1底部
16 第2凹部
17 周壁部
18 第2底部
19 第1周壁部
20 第2周壁部
21 孔部
Claims (9)
- 第1面と前記第1面とは反対側の第2面とを有し、前記第2面から前記第1面の方向に向けて突出する複数の凸部と、前記第1面から前記第2面の方向に向けて窪んだ複数の溝部とを備えた、熱可塑性樹脂繊維を含む吸収性物品用不織布であって、
前記凸部は、前記不織布の平面方向における第1方向に向けて延設されていると共に、前記不織布の平面方向において前記第1方向と直交する第2方向に予め定めた間隔で設けられ、
前記溝部は、前記第2方向に対して相互に隣り合う前記凸部の間の空間に、前記第1方向に向けて延設されていて、前記凸部の頂部における前記第1面の位置よりも第2面の方向に位置する第1底部を備えた第1凹部と、前記第1凹部内において前記第1方向に不連続に設けられ、前記第1底部に開口する窪み状に形成された、前記第1底部よりも前記第2面の方向に位置する第2底部を備えた複数の第2凹部とを有し、
前記凸部の頂部とその凸部と隣り合う他の前記凸部の頂部との間の距離が0.5~2mmであり、
前記不織布において少なくとも前記凸部を形成する繊維の平均繊維径が10~30μmである、吸収性物品用不織布。 - 前記凸部を形成する繊維の平均繊維間距離が50~150μmである、請求項1に記載の吸収性物品用不織布。
- 前記第2凹部は、前記第1底部から前記凸部の突出する方向と反対の方向に延出した周壁部と、前記周壁部における前記第1底部とは反対の方向の端部に、その端部を塞ぐように設けられた第2底部とを備えている、請求項1又は2に記載の吸収性物品用不織布。
- 前記第2凹部の前記周壁部は、前記第1方向に沿うように形成された一対の第1周壁部と、前記第2方向に沿うように形成された一対の第2周壁部とを有し、前記第1周壁部は、前記第1面と前記第2面との間を貫通させる孔部を備えている、請求項3に記載の吸収性物品用不織布。
- 前記孔部は、前記熱可塑性樹脂性繊維を溶融することなく形成された周縁部を有していて、前記周縁部には、前記熱可塑性樹脂繊維のうち、破断により形成された破断端部を備えた破断繊維の前記破断端部が含まれている、請求項4に記載の吸収性物品用不織布。
- 前記孔部は、その孔部の内部空間内に、前記熱可塑性樹脂繊維の一部が架け渡されている請求項4又は5に記載の吸収性物品用不織布。
- 前記孔部は、前記内部空間の開孔率が1~50%である、請求項4~6のいずれか1項に記載の吸収性物品用不織布。
- 前記孔部が前記第1周壁部の前記第2底部寄りの位置にのみ設けられている、請求項4~7のいずれか1項に記載の吸収性物品用不織布。
- 前記第2凹部は、前記第1凹部における前記第1底部の前記第1面から、第2底部の第1面までの距離が0.05~2mmである、請求項1~8のいずれか1項に記載の吸収性物品用不織布。
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| Application Number | Priority Date | Filing Date | Title |
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| EP15894275.5A EP3245991B1 (en) | 2015-05-29 | 2015-08-13 | Non-woven fabric for absorbent article |
| CN201580002048.9A CN105636565B (zh) | 2015-05-29 | 2015-08-13 | 吸收性物品用无纺布 |
| US15/575,917 US20180140479A1 (en) | 2015-05-29 | 2015-08-13 | Nonwoven fabric for absorbent article |
| BR112017022137-3A BR112017022137B1 (pt) | 2015-05-29 | 2015-08-13 | Material não tecido para um artigo absorvente |
| KR1020177033772A KR102462589B1 (ko) | 2015-05-29 | 2015-08-13 | 흡수성 물품용 부직포 |
| MYPI2017703184A MY181767A (en) | 2015-05-29 | 2015-08-13 | Nonwoven fabric for absorbent article |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2015-110963 | 2015-05-29 | ||
| JP2015110963A JP5829349B1 (ja) | 2015-05-29 | 2015-05-29 | 吸収性物品用不織布 |
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| WO2016194243A1 true WO2016194243A1 (ja) | 2016-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2015/072922 Ceased WO2016194243A1 (ja) | 2015-05-29 | 2015-08-13 | 吸収性物品用不織布 |
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| Country | Link |
|---|---|
| US (1) | US20180140479A1 (ja) |
| EP (1) | EP3245991B1 (ja) |
| JP (1) | JP5829349B1 (ja) |
| KR (1) | KR102462589B1 (ja) |
| BR (1) | BR112017022137B1 (ja) |
| MY (1) | MY181767A (ja) |
| TW (1) | TWI660083B (ja) |
| WO (1) | WO2016194243A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6158992B2 (ja) * | 2015-08-17 | 2017-07-05 | 大王製紙株式会社 | 吸収性物品 |
| JP6093001B1 (ja) | 2015-12-28 | 2017-03-08 | ユニ・チャーム株式会社 | 吸収性物品の液透過性シート用の不織布、並びに当該不織布を液透過性シートとして含む吸収性物品 |
| JP6093002B1 (ja) | 2015-12-28 | 2017-03-08 | ユニ・チャーム株式会社 | 吸収性物品の外装シート用の不織布、並びに当該不織布を外装シートとして含む吸収性物品 |
| JP6058852B1 (ja) | 2016-05-13 | 2017-01-11 | ユニ・チャーム株式会社 | 吸収性物品用の不織布 |
| EP4434503A3 (en) * | 2017-06-22 | 2024-12-11 | The Procter & Gamble Company | Laminate webs and absorbent articles having the same |
| US10813797B2 (en) | 2017-06-22 | 2020-10-27 | The Procter & Gamble Company | Laminate webs and absorbent articles having the same |
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| MY128983A (en) * | 1995-03-03 | 2007-03-30 | Kao Corp | Surface sheet for absorbent article |
| TW554106B (en) * | 2000-06-13 | 2003-09-21 | Idemitsu Unitech Co Ltd | Spunbonded nonwoven fabric and absorbent article |
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| US8450556B2 (en) * | 2007-08-28 | 2013-05-28 | Kao Corporation | Shaped sheet and absorbent article using the same |
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| CN103619294B (zh) * | 2011-07-07 | 2015-11-25 | 花王株式会社 | 吸收性物品 |
| JP5439524B2 (ja) * | 2012-02-29 | 2014-03-12 | 花王株式会社 | 不織布 |
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2015
- 2015-05-29 JP JP2015110963A patent/JP5829349B1/ja active Active
- 2015-08-13 MY MYPI2017703184A patent/MY181767A/en unknown
- 2015-08-13 BR BR112017022137-3A patent/BR112017022137B1/pt active IP Right Grant
- 2015-08-13 EP EP15894275.5A patent/EP3245991B1/en active Active
- 2015-08-13 KR KR1020177033772A patent/KR102462589B1/ko active Active
- 2015-08-13 WO PCT/JP2015/072922 patent/WO2016194243A1/ja not_active Ceased
- 2015-08-13 US US15/575,917 patent/US20180140479A1/en not_active Abandoned
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| JPH05317358A (ja) * | 1992-05-14 | 1993-12-03 | Kao Corp | 吸収性物品の表面材 |
| JPH08302555A (ja) * | 1995-03-03 | 1996-11-19 | Kao Corp | 吸収性物品の表面シート |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5829349B1 (ja) | 2015-12-09 |
| TWI660083B (zh) | 2019-05-21 |
| KR20180013899A (ko) | 2018-02-07 |
| EP3245991A4 (en) | 2018-03-07 |
| JP2016220998A (ja) | 2016-12-28 |
| KR102462589B1 (ko) | 2022-11-02 |
| BR112017022137A2 (ja) | 2018-07-03 |
| US20180140479A1 (en) | 2018-05-24 |
| EP3245991A1 (en) | 2017-11-22 |
| TW201700811A (zh) | 2017-01-01 |
| BR112017022137B1 (pt) | 2022-08-16 |
| EP3245991B1 (en) | 2020-01-08 |
| MY181767A (en) | 2021-01-06 |
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