WO2020246397A1 - Feuille extensible/rétractable et article absorbant doté d'une feuille extensible/rétractable - Google Patents

Feuille extensible/rétractable et article absorbant doté d'une feuille extensible/rétractable Download PDF

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Publication number
WO2020246397A1
WO2020246397A1 PCT/JP2020/021470 JP2020021470W WO2020246397A1 WO 2020246397 A1 WO2020246397 A1 WO 2020246397A1 JP 2020021470 W JP2020021470 W JP 2020021470W WO 2020246397 A1 WO2020246397 A1 WO 2020246397A1
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WIPO (PCT)
Prior art keywords
sheet
elastic
elastic member
region
low porosity
Prior art date
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PCT/JP2020/021470
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English (en)
Japanese (ja)
Inventor
織恵 辻村
淳 岩崎
政宏 南岡
賢治 安藤
弘行 横松
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from JP2020087552A external-priority patent/JP7026166B2/ja
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN202080041419.5A priority Critical patent/CN113905702B/zh
Publication of WO2020246397A1 publication Critical patent/WO2020246397A1/fr

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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
    • 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
    • A61F13/45—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
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—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
    • 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/51121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
    • 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
    • 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
    • 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
    • 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
    • A61F13/51305—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 areas of different permeability
    • 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
    • B32B5/02—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 structural features of a fibrous or filamentary layer
    • B32B5/04—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 structural features of a fibrous or filamentary layer characterised by a layer being specifically extensible by reason of its structure or arrangement, e.g. by reason of the chemical nature of the fibres or filaments
    • 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
    • B32B5/14—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 a layer differing constitutionally or physically in different parts, e.g. denser near its faces
    • 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
    • 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
    • D04H1/555—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 by ultrasonic heating
    • 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
    • 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
    • A61F2013/51322—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 being elastomeric or stretchable

Definitions

  • the sheets are fixed between the two sheets only by friction with the second sheet.
  • the first sheet is more than the length in which the second sheet is in contact with the elastic member. It is preferable that the length in contact with the elastic member is longer.
  • the elastic sheet is cross-sectionally viewed along the direction orthogonal to the extending direction of the elastic member at the forming position of the fused portion, the second sheet is formed inside the thickness direction in the entire area between the fused portions. It is preferable to have a low porosity region in which the porosity between them is relatively lower than the other regions. In the low porosity region, it is preferable that a part of the constituent fibers loses the fiber morphology and is in a melt-solidified state, and the rest of the constituent fibers maintains the fiber morphology.
  • Patent Document 1 is formed by joining two sheets to each other without using an adhesive.
  • the elastic sheet having such a structure causes sweat on the skin contact surface side. It may remain, and the stretchable sheet with sweat may come into contact with the skin, causing discomfort.
  • Patent Documents 2 and 3 disclose elastic sheets in which two sheets are joined via an adhesive, but the effect of joining the two sheets without using an adhesive and separating sweat from the skin. It does not disclose the elastic sheet having.
  • the elastic member 13 is located between the first fused portions 15a and 15b located on both sides of the elastic member 13 with the elastic member 13 sandwiched therein, by friction only with the first sheet 11 and the second sheet 12, both sheets 11, It is fixed between twelve. Between the first fused portions 15a and 15b, a space defined by the first fused portions 15a and 15b, the first sheet 11, and the second sheet 12 is formed in a cross section along the Y direction. In this space, the elastic member 13 is fixed between the two sheets 11 and 12 only by friction between the surface of the elastic member 13 and the first sheet 11 and the second sheet 12. That is, in the elastic sheet 10, the elastic member 13 is not fixed to the first sheet 11 and the second sheet 12 by a joining means such as an adhesive or fusion.
  • the elastic member 13 is both formed by friction between the surface of the elastic member 13 and the first sheet 11 and the second sheet 12 in the space along the Y direction between the pair of first fused portions 15a and 15b. It is fixed to the sheets 11 and 12. More specifically, as shown in FIG. 2, which is an enlarged view of a main part of FIG. 1, the side edge 151a on the elastic member 13 side of one first fused portion 15a and the elastic member 13 of the other first fused portion 15b.
  • the first fused portion interval D which is the interval between the side edge 151b on the side, is made narrower than the diameter d1 of the elastic member 13 in the maximum extended state of the elastic sheet 10, and the pair of first fused portions 15a
  • the elastic member 13 is fixed between the first and second sheets 11 and 12 only by the friction generated on the surface of the elastic member 13 in the space by the pinching pressure of, 15b.
  • FIG. 2 it seems that the elastic member 13 is joined to the pair of first fused portions 15a and 15b, but in reality, the elastic member 13 is not joined to the pair of first fused portions 15a and 15b. It has become.
  • the second The length of the first sheet 11 in contact with the elastic member 13 is longer than the length of the sheet 12 in contact with the elastic member 13.
  • the portion on the first sheet 11 side is Z outer in the thickness direction of the elastic sheet 10 as compared with the portion on the second sheet 12 side of the elastic member 13.
  • the low porosity region 20 may have a porosity of the entire thickness direction lower than the porosity of the other regions in the thickness direction.
  • the fibers are melted and the porosity is low, but in the inside in the thickness direction, the form in which the fibers maintain the fiber morphology and the porosity is high is low. It is excluded from the porosity region 20.
  • portions having a lower porosity than the other regions may be continuously present in the Y direction or may be intermittently present in the same direction.
  • the stretchable sheet has a low porosity region 20 on the second sheet 12.
  • the low porosity region 20 is formed on the second sheet 12 located between the pair of first fused portions 15a and 15b in the Y direction, and faces the first sheet 11 with the elastic member 13 interposed therebetween. ing.
  • the low porosity region 20 has a lower porosity than the other regions, but the low porosity region 20 and the elastic member 13 are not fused to each other.
  • the surface of the second sheet 12 facing the elastic member 13 is in close contact with the substantially flat portion of the elastic member 13.
  • the surface of the second sheet 12 facing the elastic member 13 is along the substantially flat portion of the elastic member 13. Therefore, in the elastic sheet of the present embodiment, the surface on the second sheet side is substantially flat between the pair of first fused portions 15a and 15b, while the surface on the first sheet side is outward in the thickness direction Z. It is raised to the side. That is, in the present embodiment, the low porosity region 20 has a shape that follows the shape of the elastic member 13. Specifically, the low porosity region 20 is in close contact with the surface of the elastic member 13 facing the low porosity region 20, and has a shape that follows the shape of the surface.
  • the low porosity region 20 is a region in which fibers having a melt-solidified portion and fibers having no melt-solidified portion are mixed.
  • the second low porosity region 21 may have fibers having a melt-solidified portion.
  • the abundance of the fibers having the melt-solidified portion in the second low porosity region 21 is preferably 0 to 20% of the fibers existing in the second low porosity region 21.
  • the abundance of fibers having a melt-solidified portion can be measured by observation with a scanning electron microscope. The abundance of fibers and the melt-solidified state of the fibers (state of constituent fibers) can be confirmed by the method described later.
  • the average cross-sectional area (B1) per fiber is the average value of three arbitrarily selected fibers in other regions.
  • B B2 / B1 ...
  • B Number of fibers per melt-solidified portion
  • B1 Average cross-sectional area per fiber
  • B2 Area of melt-solidified portion The abundance of fibers having a melt-solidified portion is determined by the pair of first fused portions in the elastic sheet. Measure at any three formed points and use the average value of these.
  • the first sheet 11 is formed between the pair of first fused portions 15a and 15b. It is preferable to have a plurality of regions having different porosities. In the region between the pair of first fused portions 15a and 15b in the first sheet 11, the region having a relatively low porosity among the plurality of regions having different porosities has the following configurations (c1) to (c3). ), Or a combination of two or more of these.
  • Configuration (c1) A portion that comes into contact with the skin is formed in the region between the pair of first fused portions 15a and 15b in the first sheet 11.
  • Configuration (c2) Located in the center of the region between the pair of first fused portions 15a and 15b in the first sheet 11 in the Y direction.
  • Configuration (c3) The length in the Y direction is the same as or longer than the length in the Y direction of the region having a relatively high porosity among the plurality of regions having different porosities. From the viewpoint of further improving the effect, the length of the region having a relatively low porosity in the Y direction is the length of the region having a relatively high porosity in the Y direction with respect to the configuration (c3). On the other hand, it is preferably 100% or more, more preferably 120% or more, and preferably 200% or less, more preferably 150% or less.
  • the region having a relatively high porosity and the region having a relatively low porosity between the first fused portions 15a and 15b of the first sheet 11 are specified by the following method. First, the region where the first sheet 11 and the elastic member 13 overlap is divided into 10 regions in the Y direction, and each of these regions is divided into 10 regions by using the image processing software described above to cover the entire area of the region. And the void area are measured. Next, the porosity in each of the 10 regions is calculated by dividing the void area by the area of the entire region. Next, the 10 regions are divided into two groups so that the difference in porosity is 30% or more.
  • the region belonging to the group with the higher porosity is referred to as the "region having a relatively high porosity"
  • the region belonging to the group having the lower porosity is referred to as the "region having a relatively low porosity”.
  • the first and second sheets 11 and 12 are joined by a plurality of fused portions arranged along the Y direction.
  • the elastic member 13 shown in FIG. 1 contracts, and the elastic sheet 10 becomes narrower in the X direction.
  • the convex portion 17 reduces the contact area between the elastic sheet and the skin and increases the ratio of the sweat diffusion area to the contact area, so that the sweat evaporation effect is further improved.
  • the perspiration diffusion area is the low porosity region 20, or the area where the elastic sheet is wet by the perspiration that has migrated and diffused between the low porosity region 20 and the elastic member 13.
  • the first and second sheets 11 and 12 project so as to be separated from each other along the thickness direction as shown in FIG. 6 with the second fused portion 16 as the starting point of bending. That is, in the elastic sheet 10, convex portions 17 are formed on the first sheet 11 and the second sheet 12 so as to protrude from each other along the thickness direction Z, respectively.
  • the transpiration effect is further improved, and the contact area between the sweat-wet elastic sheet 10 and the skin is reduced, so that the wearing feeling of the absorbent article using the sheet is further improved. To do.
  • the convex portion 17 is a portion of the elastic sheet 10 that forms folds, which will be described later, and is a portion that follows the shape of the elastic member 13 at a position where the first sheet 11 and the second sheet 12 overlap the elastic member 13. Is a different part.
  • the second fusion along the Y direction with respect to the distance Le is Le (see FIG. 1)
  • the value of L16 / Le which is the ratio of the length L16 (see FIG. 1) of the landing portion 16, is preferably 0.25 or more, more preferably 0.50 or more, and more preferably 0.70 or more. Is more preferable. The closer the value of L16 / Le is to 1, the more preferable it is from the viewpoint of ensuring the joint strength.
  • the distance Le between two elastic members 13 adjacent to each other along the Y direction is preferably 1 mm or more.
  • the Le value is preferably 10 mm or less, more preferably 8 mm or less, and even more preferably 6 mm or less.
  • the value of Le is preferably 1 mm or more and 10 mm or less, more preferably 1 mm or more and 8 mm or less, and further preferably 1 mm or more and 6 mm or less.
  • the lengths in the X direction which are the widths of the first fused portion 15 and the second fused portion 16, are preferably 3 mm or less and 2 mm or less independently of each other. It is preferably 1 mm or less, and more preferably 1 mm or less.
  • the lower limit of the width is not particularly limited, and the smaller the value, the more preferable.
  • the material constituting the elastic sheet 10 will be described in detail.
  • the first and second sheets 11 and 12 for example, air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, non-woven fabric produced by various manufacturing methods such as melt blown non-woven fabric, and two or more of these are laminated and integrated.
  • a laminated fabric or the like can be used.
  • the fiber sheets used as both sheets or one sheet are air-through non-woven fabric, heat roll non-woven fabric, spunlace non-woven fabric, spunbond non-woven fabric, melt blown non-woven fabric and the like. Is preferable.
  • a non-woven fabric is preferably used as the first and second sheets 11 and 12.
  • the basis weight of the non-woven fabric is preferably 5 g / m 2 or more and 50 g / m 2 or less, and particularly preferably 8 g / m 2 or more and 30 g / m 2 or less.
  • the buckling strength of the non-woven fabric having such a basis weight is preferably 50 cN or less in the direction orthogonal to the machine flow direction (CD), particularly preferably 30 cN or less, and preferably 70 cN or less in the machine flow direction (MD), particularly preferably 50 cN or less. Is. By using a soft sheet, the formability of the folds can be enhanced. Buckling strength is measured by the following method.
  • the average value of the maximum intensity of each measurement sample is obtained, and this is used as the buckling intensity in the orthogonal direction (CD).
  • the buckling strength in the machine flow direction (MD) is the same as above, except that a rectangular test piece of 150 mm in the direction orthogonal to the machine flow direction (CD) and 30 mm in the machine flow direction (MD) is taken. Be measured.
  • the first and second sheets 11 and 12 are not limited to two separate sheets, but one sheet is bent to form two opposing surfaces, and a portion constituting one surface is 1 The portion constituting one sheet and the other surface may be used as another sheet.
  • the one sheet is preferably a hydrophilic fiber sheet.
  • the figure shows an apparatus preferably used for manufacturing the elastic sheet 10.
  • the device 100 shown in the figure includes an ultrasonic fusion unit 30.
  • the ultrasonic fusion unit 30 includes a horn 31 that vibrates ultrasonic waves and a receiving roll 32 that is arranged at a position facing the tip surface of the horn 31.
  • the horn 31 is made of a metal such as an aluminum alloy or a titanium alloy, and is designed to resonate in the frequency band used.
  • the horn 31 is connected to a booster (not shown), and the ultrasonic vibration transmitted from the booster to the horn 31 is amplified or attenuated inside the horn 31 and applied to the welding object.
  • the receiving roll 32 is designed so that the temperature of the receiving roll 32 can be adjusted, whereby the first sheet 11 and the second sheet 12 in contact with the receiving roll 32 can be heated. That is, the first sheet 11 and the second sheet 12 can be heated by being wound around the receiving roll 32.
  • the receiving roll 32 can adjust the temperature of the receiving roll 32 by, for example, providing a heater for heating the receiving roll 32 and a temperature sensor for measuring the temperature of the receiving roll 32 inside the rotating shaft side. it can.
  • a horn 31, which will be described later, is pressed against the second sheet 12, and ultrasonic vibration is directly applied to the second sheet 12.
  • FIG. 9 shows an enlarged view of the main part of the ultrasonic fusion section 30 in FIG.
  • the ultrasonic fusion portion 30 includes a receiving roll 32 in which contact portions 40 and 41 forming convex portions are formed on the peripheral surface, and a horn 31 capable of contacting the convex portions.
  • the Y direction shown in FIG. 9 is the width direction (axial direction) of the receiving roll 32, and this direction coincides with the Y direction in the stretchable sheet 10 to be manufactured.
  • a pair of convex portions are arranged along the axial direction on the peripheral surface of the receiving roll 32 in the ultrasonic fusion portion 30.
  • a concave portion 42 is formed between the pair of convex portions.
  • the pair of convex portions are collectively referred to as a first contact portion 40.
  • the receiving roll 32 is provided with a first contact portion 40 intermittently along the rotation direction R (see FIG. 8) of the roll. Further, a plurality of second contact portions 41 are intermittently provided on the peripheral surface of the receiving roll 32 along the rotation direction R of the receiving roll 32.
  • the first contact portion 40 and the second contact portion 41 form a convex portion protruding toward the horn 31 on the peripheral surface of the receiving roll. That is, the first contact portion 40 and the second contact portion 41 are located on the side closer to the horn 31.
  • the first contact portions 40 are located on the same line in the rotation direction R
  • the second contact portions 41 are located on the same line in the rotation direction R.
  • the first contact portion 40 and the two second contact portions 41 are alternately arranged side by side in the width direction thereof.
  • the surface having the portions that abut the first contact portion 40 and the second contact portion 41 is a flat surface without unevenness.
  • the first contact portion 40 is provided with a recess 42 in a substantially central portion in the Y direction, that is, in the roll width direction.
  • the recess 42 has a rectangular shape in a cross-sectional view along the width direction of the receiving roll 32.
  • the recess 42 has a volume for accommodating at least a part of the elastic member 13 in the extended state. In other words, the recess 42 has a volume such that the elastic member 13 can partially protrude from the upper surface of the first contact portion 40 in a state where the elastic member 13 is housed in the recess 42.
  • the opening width of the recess 42 along the Y direction roughly corresponds to the first fused portion spacing D (see FIG. 2) in the target elastic sheet 10.
  • the first sheet 11, the second sheet 12, and a plurality of elastic members 13 arranged in an extended state between the sheets 11 and 12 are used.
  • the first sheet 11 unwound from the original fabric 11a of the first sheet 11 is conveyed while being wound around the peripheral surface of the receiving roll 32.
  • a plurality of elastic members 13 each unwound from the winding body 13a are arranged on the surface of the first sheet 11 in an extended state. ..
  • the elastic member 13 is conveyed in a state of being partially housed in the recess 42 of the first contact portion 40 provided on the peripheral surface of the receiving roll 32. At this point, the first sheet 11 is previously housed in the recess 42 (see FIG. 9).
  • the degree of extension of the elastic member 13 is larger than the degree of extension of the elastic member 13 in the maximum extended state of the elastic sheet 10, and the diameter of the elastic member 13 is large. It is smaller than the opening width of the recess 42 along the Y direction.
  • the second sheet 12 unwound from the original fabric 12a of the second sheet 12 is supplied to the peripheral surface of the receiving roll 32.
  • a laminated body in which the stretched elastic member 13 is arranged between the first sheet 11 and the second sheet 12 is prepared. That is, the laminated body is supplied so that the elastic member 13 in the laminated body passes through the concave portion 42 in a state where the convex portions 40, 41 of the receiving roll 32 and the joint portion of the sheet member face each other.
  • the first sheet 11 and the second sheet 12 are preheated by being wound around the receiving roll 32 as described above. Ultrasonic vibration is applied to the laminated body by the horn 31 (see FIGS.
  • the laminated body is pressurized by the horn 31 to form a substantially flat portion on the second sheet 12 side of the elastic member 13, and the second sheet 12 is in close contact with the elastic member 13 to form the substantially flat portion. It will be in a state along the flattened part.
  • the ultrasonic fusion section 30 fuses the first sheet 11 and the second sheet 12 in the laminated body at positions on both sides of the elastic member 13 and at a plurality of positions spaced apart along the Y direction. Let me. As a result, the pair of first fused portions 15a and 15b described above and the second fused portion 16 are formed. As shown in FIG. 9, on the peripheral surface of the receiving roll 32, the first contact portion 40 and the second contact portion 41 are projected from the other portions and are located closer to the horn 31. , The first sheet 11 and the second sheet 12 located on the first contact portion 40 and the second contact portion 41 are fused, and the first fusion portion 15 and the second fusion portion 16 for joining these sheets are fused. Is formed.
  • the elastic member 13 is partially housed in the recess 42, and the elastic member 13 is not fused to either the first sheet 11 or the second sheet 12, and the non-bonded state is maintained.
  • the ultrasonic fusion portion 30 By the fusion by the ultrasonic fusion portion 30, a part of the constituent fibers is melted between the pair of first fusion portions 15a and 15b of the second sheet 12 to form a low porosity region 20, and the first sheet is formed.
  • a second low porosity region 21 is formed between the pair of first fused portions 15a and 15b of 11.
  • the elastic member 13 having an increased diameter has a first fused portion interval D or more, which is an interval between the two first fused portions 15a and 15b, and is preferably a first fused portion interval. Exceeds D.
  • the elastic member 13 is sandwiched by the two first fused portions 15a and 15b, and is fixed only by the friction between the first sheet 11 and the second sheet 12. Further, due to the fusion, a portion of the constituent fibers between the pair of first fusion portions 15a and 15b of the second sheet 12 is melted and solidified as the temperature decreases.
  • the degree of extension of the elastic member 13 is such that the elastic sheet 10 has desired extensibility ( Stretch rate) and is selected to have the desired folds.
  • the degree of extension of the elastic member 13 can be adjusted by appropriately adjusting the depth and width of the recesses 42 (first fused portion interval D) and the like.
  • the first sheet 11 and the elastic member 13 in the laminated body It is preferable to adjust the depth and width of the recess 42 so that there is no gap between the second sheet 12 and the second sheet 12.
  • the size of the recess 42 is preferably within the following range.
  • the width c of the recess 42 (see FIG. 10) is preferably 1.
  • the diameter a of the elastic member 13 in the extended state (see FIG. 10), assuming that the elastic member 13 fits in the recess 42 together with the first sheet 11. It is more than 0 times and 2.0 times or less.
  • the diameter a (see FIG. 10) of the elastic member 13 in the extended state is preferably 1.1 times or more and 1.5 times or less, more preferably 1.2 times or more 1 of the depth b (see FIG. 10) of the recess 42. It is 5.5 times or less, more preferably 1.3 times or more and 1.5 times or less.
  • the linear pressure of the horn 31, that is, the pressure applied to the laminate by pressing the horn 31 against the laminate is preferably 3 N / mm or more, more preferably 3 2.
  • the preheating temperature of the second sheet 12 is preferably lower than the melting point of the constituent fibers of the second sheet 12.
  • the preheating temperature of the second sheet 12 is preferably 90 ° C. to 135 ° C. lower than the melting point of the constituent fibers of the second sheet 12, and more preferably 95 ° C. to 130 ° C. lower. It is more preferably 100 ° C. to 125 ° C. lower.
  • the preheating temperature of the second sheet 12 is 40 ° C. (with respect to the melting point-). It is preferably in the range of 123 ° C.) to 60 ° C. (melting point ⁇ 103 ° C.). From the viewpoint of more easily preheating the second sheet 12, the temperature of the receiving roll 32 is preferably set in a range of 90 ° C. to 135 ° C. lower than the melting point of the constituent fibers of the second sheet 12.
  • the melting point of the constituent fibers of the second sheet 12 means the melting point of the resin having the lowest melting point among the constituent resins of the constituent fibers in the second sheet 12.
  • the melting point of the constituent fibers can be measured by thermal analysis using a differential scanning calorimeter (for example, DSC6200 manufactured by Seiko Instruments, Inc.). Specifically, a thermal analysis of a fiber sample (1 mg) finely cut from any 10 points on the web or non-woven fabric is performed at a heating rate of 10 ° C./min, and the melting peak temperature of the fiber constituents to be measured is determined by the constituent fibers. Let it be the melting point of. When there are a plurality of melting peak temperatures, the lowest melting peak temperature among them is defined as the melting point of the constituent fibers.
  • the elastic sheet 10 thus obtained can be used as a constituent material of an absorbent article such as a disposable diaper and a sanitary napkin, and is particularly preferably used for forming an elastic portion of the absorbent article.
  • Absorbent articles are mainly used for absorbing and retaining body fluids excreted from the body such as urine and menstrual blood.
  • Absorbent articles include, but are not limited to, disposable diapers, sanitary napkins, incontinence pads, panty liners, etc., and broadly include articles used for absorbing liquid discharged from the human body. To do.
  • the absorbent articles include, for example, an absorbent main body having a liquid-retaining absorbent body interposed between the front sheet, the back sheet, and both sheets, and an exterior body located on the non-skin facing surface side of the absorbent main body.
  • the elastic sheet of the present invention is preferably used for an exterior body.
  • the exterior body contains the elastic sheet of the present invention, from the viewpoint of more reliably exerting the above-mentioned effect of separating sweat from the skin, in the elastic sheet, the first sheet 11 in the elastic sheet faces the skin. It is preferably arranged so as to be on the side, and more preferably arranged so as to be in contact with the wearer's skin.
  • the "skin facing surface” is a surface of the absorbent article or its constituent members (for example, an absorber) that is directed toward the wearer's skin when the absorbent article is worn, that is, a side relatively close to the wearer's skin. ..
  • the absorbent article may further include various members according to its specific use. Such members are known to those of skill in the art.
  • the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment.
  • the pair of first fused portions 15a and 15b and the second fused portion 16 are intermittently provided on the same straight line in the Y direction, but these fused portions 15a , 15b, 16 may be continuous on the same straight line in the Y direction.
  • the first fused portion 15 and the second fused portion 16 have a rectangular shape, but instead of this, a shape such as an oval shape, a circular shape, or a rhombus shape may be adopted.
  • the first sheet 11 is a hydrophilic sheet and the second sheet 12 is a hydrophobic sheet has been mainly described, but the present invention is not limited to this, and the first sheet 11 is hydrophobic. It is a sex sheet, and the second sheet 12 may be a hydrophilic sheet. Alternatively, both the first sheet 11 and the second sheet 12 may be hydrophilic sheets, or both may be hydrophobic sheets.
  • the elastic sheet 10 has a plurality of elastic members 13, but the elastic sheet 10 may have one elastic member 13.
  • the first sheet 11 has the second low porosity region 21, but the elastic sheet 10 does not have to have the second low porosity region 21.
  • the first sheet 11 may have a region facing the second sheet 12 with the elastic member 13 interposed therebetween having the same porosity as the other regions described above.
  • the present invention further discloses the following elastic sheet, an absorbent article including the same, and a method for producing the elastic sheet.
  • It has a first sheet made of a fiber sheet, a second sheet arranged opposite to the first sheet and made of a fiber sheet, and an elastic member arranged between both sheets in an extended state and extending in one direction.
  • An elastic sheet having elasticity along the extending direction of the elastic member.
  • the first sheet and the second sheet are joined by a plurality of fused portions located on both sides of the elastic member with the elastic member interposed therebetween and formed at intervals along the extending direction of the elastic member.
  • the elastic member is formed on the surface of the elastic member, the first sheet, and the space defined by the fused portion, the first sheet, and the second sheet located on both sides of the elastic member. It is fixed between both seats only by friction with the second seat,
  • the elastic sheet is cross-sectionally viewed along a direction orthogonal to the extending direction of the elastic member at the forming position of the fused portion, the first sheet is more than the length in which the second sheet is in contact with the elastic member.
  • the length in contact with the elastic member is longer,
  • the elastic sheet is cross-sectionally viewed along a direction orthogonal to the extending direction of the elastic member at the forming position of the fused portion, the second sheet is formed inside in the thickness direction in the entire area between the fused portions.
  • It has a low porosity region where the porosity between fibers is relatively lower than the other regions.
  • a stretchable sheet in which a part of the constituent fibers loses the fiber morphology and is in a melt-solidified state, and the rest of the constituent fibers maintains the fiber morphology.
  • the elastic sheet When the elastic sheet is cross-sectionally viewed along a direction orthogonal to the extending direction of the elastic member at the formation position of the fusion portion, the portion of the elastic member on the first sheet side is the second elastic member. Compared to the part on the sheet side, the elastic sheet is raised outward in the thickness direction.
  • ⁇ 3> In a cross-sectional view along a direction orthogonal to the extending direction of the elastic member, on the second sheet side of the elastic member, the portions between the fused portions located on both sides of the elastic member are other than between the fused portions.
  • the elastic sheet according to ⁇ 2> which is a substantially flat portion as compared with the portion.
  • ⁇ 4> The above-mentioned ⁇ 2> or ⁇ 3>, wherein the surface on the second sheet side is substantially flat between the fused portions, while the surface on the first sheet side is raised outward in the thickness direction.
  • Elastic sheet. ⁇ 5> The elastic sheet according to any one of ⁇ 1> to ⁇ 4>, wherein the low porosity region has a shape that conforms to the shape of the elastic member.
  • the difference between the maximum thickness and the minimum thickness in the low porosity region is 5 ⁇ m or less.
  • ⁇ 9> The elastic sheet according to any one of ⁇ 1> to ⁇ 8>, wherein the low porosity region and the elastic member are not fused to each other.
  • ⁇ 10> The elastic sheet according to any one of ⁇ 1> to ⁇ 9>, wherein the first sheet is a hydrophilic sheet.
  • the distance between the side edge on the elastic member side in one fused portion and the side edge on the elastic member side in the other fused portion is defined as D.
  • the value of d2 / D is 1.1 or more, preferably 1.2 or more, more preferably 1.3 or more.
  • ⁇ 15> The elastic sheet according to any one of ⁇ 1> to ⁇ 14>, wherein the length of the fused portion along the extending direction of the elastic member is 3 mm or less, preferably 2 mm or less, more preferably 1 mm or less. .. ⁇ 16>
  • Another fusion portion for joining the first sheet and the second sheet is arranged between the adjacent elastic members and the fusion portions adjacent to each other in the orthogonal direction.
  • ⁇ 18> When the distance between the adjacent elastic members is Le and the length of the other fused portion along the orthogonal direction is L16, the value of L16 / Le is 0.25 or more, preferably 0.50 or more, and more.
  • ⁇ 19> The elastic sheet according to ⁇ 17> or ⁇ 18>, wherein the length of the other fused portion along the extending direction of the elastic member is 3 mm or less, preferably 2 mm or less, more preferably 1 mm or less.
  • ⁇ 20> The elastic sheet according to any one of ⁇ 1> to ⁇ 19>, wherein the first sheet has a plurality of regions having different porosities between the fused portions.
  • the first sheet has a region having a relatively high porosity and a region having a relatively low porosity among the plurality of regions.
  • the first sheet has a region having a relatively high porosity and a region having a relatively low porosity among the plurality of regions.
  • the first sheet has a region having a relatively high porosity and a region having a relatively low porosity among the plurality of regions.
  • the region having a relatively low porosity has a length in the orthogonal direction equal to or longer than the length in the orthogonal direction of the region having a relatively high porosity, said ⁇ 20>.
  • the elastic sheet according to any one of ⁇ 22>. ⁇ 24> The first sheet has a region having a relatively high porosity and a region having a relatively low porosity among the plurality of regions.
  • the length of the region having a relatively low porosity in the orthogonal direction is 100% or more, preferably 120% or more, with respect to the length of the region having a relatively high porosity in the orthogonal direction.
  • the elastic sheet according to any one of ⁇ 20> to ⁇ 23> which is 200% or less, preferably 150% or less.
  • the first sheet has a region having a relatively high porosity and a region having a relatively low porosity among the plurality of regions.
  • Sex sheet. ⁇ 26> The stretchability according to any one of ⁇ 1> to ⁇ 25>, wherein a convex portion is formed on the first sheet along the thickness direction of the stretchable sheet in a direction away from the elastic member. Sheet.
  • the first sheet and the second sheet are formed by bending one sheet to form two opposing surfaces, and a portion constituting one surface constitutes the first sheet and the other surface.
  • the elastic sheet according to any one of ⁇ 1> to ⁇ 30>, wherein the portion to be formed is the second sheet.
  • An absorbent article composed of an absorbent body and an exterior body located on the non-skin facing surface side of the absorbent body.
  • An absorbent article in which the exterior body includes the elastic sheet according to any one of ⁇ 1> to ⁇ 32>.

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

Abstract

La présente invention comprend une première feuille (11), une seconde feuille (12) et une pluralité d'éléments élastiques (13) qui sont disposés dans un état étiré entre les deux feuilles (11, 12) et qui s'étendent dans une direction. La première feuille (11) et la seconde feuille (12) sont reliées par une pluralité de parties liées par fusion (15) qui sont positionnées de façon à enserrer les éléments élastiques (13) sur les deux côtés et qui sont formées avec des espaces entre elles le long de la direction dans laquelle s'étendent les éléments élastiques (13). Les éléments élastiques (13) sont fixés uniquement par frottement avec les deux feuilles (11, 12) dans un espace délimité par les parties liées par fusion (15), la première feuille (11) et la seconde feuille (12). La seconde feuille (12) a une région à faible porosité (20) sur le côté interne dans la direction de l'épaisseur le long de la totalité de la région entre les parties liées par fusion. Dans la région à faible porosité (20), certaines des fibres constitutives sont fondues et solidifiées de telle sorte que sa forme fibreuse soit perdue et la forme fibreuse des fibres constitutives restantes est maintenue.
PCT/JP2020/021470 2019-06-04 2020-05-29 Feuille extensible/rétractable et article absorbant doté d'une feuille extensible/rétractable WO2020246397A1 (fr)

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JP2020087552A JP7026166B2 (ja) 2019-06-04 2020-05-19 伸縮性シート、及び該伸縮性シートを備えた吸収性物品
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