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WO1998022056A1 - Feuille en non-tisse impermeable aux liquides pour article absorbant - Google Patents

Feuille en non-tisse impermeable aux liquides pour article absorbant Download PDF

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Publication number
WO1998022056A1
WO1998022056A1 PCT/JP1997/004134 JP9704134W WO9822056A1 WO 1998022056 A1 WO1998022056 A1 WO 1998022056A1 JP 9704134 W JP9704134 W JP 9704134W WO 9822056 A1 WO9822056 A1 WO 9822056A1
Authority
WO
WIPO (PCT)
Prior art keywords
woven fabric
fiber
liquid impermeable
absorbent article
impermeable sheet
Prior art date
Application number
PCT/JP1997/004134
Other languages
English (en)
Inventor
Yoshimi Tsujiyama
Shingo Horiuchi
Original Assignee
Chisso Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chisso Corporation filed Critical Chisso Corporation
Priority to JP52345498A priority Critical patent/JP4442932B2/ja
Priority to DE19782125A priority patent/DE19782125C2/de
Priority to DE19782125T priority patent/DE19782125T1/de
Priority to AU49651/97A priority patent/AU4965197A/en
Publication of WO1998022056A1 publication Critical patent/WO1998022056A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—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
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from 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
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • 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
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15406—Basis weight
    • 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
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15422—Density
    • 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
    • A61F2013/51009—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 characterized by the shape of the fibres
    • A61F2013/51011—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 characterized by the shape of the fibres characterized by the count of the fibres, e.g. denier or tex
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608—Including strand or fiber material which is of specific structural definition
    • Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608—Including strand or fiber material which is of specific structural definition
    • Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
    • Y10T442/622—Microfiber is a composite fiber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608—Including strand or fiber material which is of specific structural definition
    • Y10T442/614—Strand or fiber material specified as having microdimensions [i.e., microfiber]
    • Y10T442/626—Microfiber is synthetic polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
    • Y10T442/64—Islands-in-sea multicomponent strand or fiber material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/659—Including an additional nonwoven fabric

Definitions

  • This invention relates to a liquid impermeable sheet and an absorbent article using the same.
  • absorbent articles include medical and sanitary materials such as disposable diapers and sanitary napkins. More specifically,
  • this invention relates to a liquid impermeable sheet and an absorbent article
  • Absorbent articles such as disposable diapers and sanitary napkins for
  • such an absorbent article comprises at least a liquid absorbent layer for absorbing and holding body fluid such as urine and blood, a liquid permeable surface cover that made of a non-woven fabric, a woven fabric, a knitted fabric etc. and that is provided at the skin side of the article, and a liquid impermeable back sheet that is provided at the back side in order to prevent the absorbed body fluid from
  • Such an absorbent article usually comprises water repellent side sheets of a non-woven fabric or the like provided on both sides of the absorbent article in addition to the back sheet in order to prevent the liquid
  • the side sheet In disposable diapers or the like, the side sheet is often gathered, and therefore it is called side gathers or a leg cuff. In disposable diapers, the side sheets are provided in such a position that they surround and hold the groin or the thighs when the disposable diaper is
  • a water repellent round sheet of a non- woven fabric or the like is further provided on the skin sides of the portion
  • band-like waist gathers or the like are provided on the waist position skin side, and these also comprises a water repellent sheet of a non-woven fabric or the like.
  • liquid absorbent layers comprising cellulose fibers
  • liquid impermeable sheets are used for back sheets of such absorbent articles since comparatively good liquid impermeability is required for back sheets.
  • thermoplastic films are used for the conventional back sheets of absorbent articles.
  • the thermoplastic films are formed with countless
  • the film is combined with a non-woven fabric to improve the appearance and feeling of the film and also to improve the strength.
  • Non-woven fabrics provided with water repellency and
  • Thermoplastic films having air permeability are used generally for back sheets of absorbent articles.
  • the conventional back sheets are
  • Thermoplastic films are not sufficient in air permeability though they provide good liquid impermeability.
  • repellent non-woven fabric is used for side sheets, round sheets and waist gathers. However, it would be more preferable if the liquid impermeability
  • a liquid impermeable baffle layer is provided between the back sheet of plastic films and an absorbent so that a cloth-like touch is provided while leakage is prevented.
  • the article will be heavy due to its
  • Japanese Patent Application Tokkai-Hei 6- 14949 discloses an
  • This invention aims to provide a liquid impermeable sheet with good air
  • Another aim of this invention is to provide a liquid impermeable sheet for an absorbent article with excellent strength as
  • sheet for an absorbent article of this invention comprises a melt blown non-
  • the melt blown non-woven fabric satisfies the following Formulas A
  • d apparent density of the non-woven fabric (g/cc) It is preferable in the sheet that a fiber non-woven fabric comprising a
  • thermoplastic polymer is further laminated.
  • the melt blown non-woven fabric comprises thermoplastic ultra fine conjugated fibers having a diameter of 10 ⁇
  • the melt blown non-woven fabric comprises thermoplastic ultra fine combined fibers having fiber diameter of 10 ⁇ m at most, where a low melting point polymer and a high melting point
  • the melting point difference between the polymers is at least l ⁇ t.
  • the liquid impermeable sheet is at
  • At least one sheet selected from the group consisting of a back sheet, a side sheet, a round sheet and a waist gather for an absorbent article.
  • the melt blown non-woven fabric it is preferable in the sheet that the melt blown non-woven fabric
  • non-woven fabric is at least one fiber selected from the group consisting of single fiber of a single composition, conjugated fiber formed by conjugating a low melting point polymer and a high melting point polymer, and combined fiber
  • the average fiber diameter of the melt blown fabric as 0.1-9 /x m.
  • non-woven fabric is 4-50 g/m z .
  • thermoplastic fiber non-woven fabric comprises filament and/or staple fiber. It is preferable in the sheet that the thermoplastic non-woven fabric comprises two-composition conjugated fiber formed by conjugating a low melting point polymer and a high melting point polymer.
  • the fiber is at least one conjugated
  • sheath-core type fiber parallel type fiber
  • multilayer type fiber multilayer type fiber
  • the polymer composition composing the conjugated fiber is at least one polymer selected from the group consisting of
  • polyolefins polyesters and polyamides.
  • composing the non-woven fabric is 0.5-10d/f.
  • the length of the staple fiber is preferable in the sheet that the length of the staple fiber
  • composing the non-woven fabric is 3-5 lmm.
  • the staple fiber composing the non- woven fabric is at least one fiber selected from the group consisting of crimped
  • the cross section of the fiber has at least one shape selected from the group consisting of circular, modified, and
  • melt blown non-woven fabric and a fiber non-woven fabric for lamination are laminated by using at least one
  • embossed rollers ultrasonic welding, a hot air cycle bonding using hot air blow at a temperature within the range between the melting points of a high melting point polymer and a low melting point polymer, and a hot melt bonding using a hot melt polymer.
  • An absorbent article of this invention comprises, for at least one of its
  • a non-woven fabric of this invention composing a liquid impermeable
  • the non-woven fabric comprising fibers spun in a melt blowing method, and the fiber diameter is 10 ⁇ m or less.
  • the non-woven fabric satisfies the Formulas A and B, and thus, a liquid impermeable sheet comprising the non-woven fabric has good air
  • Such sheets are preferably used for absorbent articles.
  • thermoplastic fiber non-woven fabric is preferably used in the embodiments of this invention.
  • a liquid impermeable sheet that has good non-woven fabric strength and good feeling can be provided, and such sheets are preferably used for absorbent articles.
  • the melt blown non-woven fabric of this invention preferably comprises
  • thermoplastic ultra fine conjugated fiber made of a low melting point polymer
  • liquid impermeable sheets with less fuzz which are preferably used for absorbent articles, are provided.
  • the melt blown non-woven fabric of this invention preferably comprises thermoplastic ultra fine fibers formed by combining a low melting point polymer and a high melting point polymer, the difference of the melting points between the polymers being at least 15°C, and the fiber diameter being 10/t m at most.
  • liquid impermeable sheets with less fuzz which are preferably used
  • thermoplastic fiber non-woven fabric to be laminated on the melt blown non-woven fabric is preferably a filament non-woven fabric in this invention.
  • the sheets have less fuzz, and thus, the sheets have good strength and are preferably
  • the liquid impermeable sheet in the preferable embodiments of this invention is at least one selected from the group consisting of a back sheet, a side sheet, a round sheet and a waist gather, so that good air permeability and
  • An absorbent article comprising the liquid impermeable sheet of this invention does not cause a problem of body fluid leakage from the article to the outside, while air permeability and feeling of the same absorbent article are good.
  • FIG. 1 is a plan view showing one example of a disposable diaper
  • FIG. 2 is a schematic cross sectional end view taken on line X-X' of FIG. 1.
  • FIG. 3 is a schematic cross sectional end view taken on line Y-Y' of FIG. 1.
  • FIG. 4 is a plan view showing one example of a sanitary napkin partially using a liquid impermeable sheet of this invention, in unwapped form, as seen from the skin side.
  • FIG. 5 is a schematic cross sectional end view taken on line X-X' of FIG.
  • a non-woven fabric used for a liquid impermeable sheet for an absorbent article of this invention is a non-woven fabric spun by a melt blowing
  • a melt blown non-woven fabric is produced by the following steps, though the details are omitted as this fabric is well known.
  • a thermoplastic polymer is melted and extruded to be a fiber from a melt blowing spinneret.
  • a hot gas is injected at a high speed from a slit formed around the
  • the fiber flow is deposited on a scavenger such as collecting endless net conveyor to obtain an ultra fine fiber web.
  • the web is processed to be a non- woven fabric by heat-sealing if necessary, (see Japanese Patent Application
  • fiber is produced in the following process: extruding melted fiber from a spinneret; injecting a hot, high speed gas to blow the flow of the fiber melted polymer in order to draw the extruded fiber melted
  • the fiber is drawn in melted condition so generally it is not oriented due to the drawing. Therefore, the
  • non-woven fabric comprises fibers that are substantially undrawn.
  • the non- woven fabric typically comprises ultra fine staple fibers since the melted fibers
  • Air is generally used for the hot, high speed gas, however, any other gases such as steam can be used as long as they do not react with and deteriorate the melted polymer.
  • the gas temperature ranges from 300 to 400°C,
  • Polyolefin polymers and polyester polymers are preferably used for the polymers to be the thermoplastic fibers used in the melt blown non-woven fabric.
  • the polyolefin polymers include polypropylene, high density polyethylene,
  • polyester polymers include polyethylene terephthalate and polybutylene terephthalate. Pigments, flame retarders, deodorants, antistatic agents and antioxidants can be added to the thermoplastic fibers in an amount such that the additives do not deteriorate
  • the fibers composing the melt blown non-woven fabric can be selected from the group consisting of single fiber comprising a single composition, conjugated fiber formed by conjugating a low melting point polymer and a high melting point polymer, and combined fiber formed by combining a low melting
  • the difference of the melting points between a high melting point polymer and a low melting point polymer is preferably at least 15°C. Otherwise, the high melting point polymer will also be softened or melted and easily lose its fiber shape when a non-woven fabric is
  • a non-woven fabric comprising conjugated or combined fibers is preferable since it can provide a liquid
  • An article comprising the conjugated or combined fibers is preferred to an article comprising single fiber having a single composition, since the fibers can be
  • the average fiber diameter of the melt blown fabric of this invention is preferably 10 ⁇ m or less, more preferably, 0.1-9 ⁇ m. It is further preferable that the diameter range is 0.2-8 ⁇ m. Fiber with a diameter from 10 to 0.1 ⁇ m is preferred since it provides excellent feeling, and it is easily produced at a low cost.
  • the apparent density (d(g/cc)) of the melt blown non-woven fabric for this invention is 0.05 ⁇ d ⁇ 0.2.
  • impermeable sheet for the absorbent article cannot be maintained even if the basis weight is high, and liquid will be leaked.
  • the apparent density (d) exceeds 0.2, the feeling and appearance will deteriorate due to the bad air
  • the basis weight of the melt blown non-woven fabric for this invention is preferably 4-50g/m 2 , more preferably, 4-30 g/m 2 .
  • the basis weight is preferably 4-50g/m 2 , more preferably, 4-30 g/m 2 .
  • a non-woven fabric having the above range of basis weight is preferably used to avoid the above-identified problems.
  • the melt blown non-woven fabric for this invention should meet the requirement: 2 ⁇ W/D 2 ⁇ 200 when W : basis weight (g/m 2 ), D: fiber diameter
  • This formula indicates that a thin non-woven fabric basis weight can be used if the fibers composing the melt blown non-woven fabric are fine, while the
  • basis weight should be thick if the fiber diameter is big.
  • a melt blown non-woven fabric for this invention can be used without processing after it is spun and scavenged. Or it can be compressed by using
  • smooth rollers in order to control its apparent density.
  • the smooth rollers can be heated to a degree such that the melt blown non-woven fabric will not be like a film, and unheated smooth rollers also can be used.
  • emboss roll heat bonding a method to use hot air in a temperature range between the melting points of two kinds of polymers.
  • melt blown non-woven fabric for this invention can be used by laminating with other kinds of thermoplastic fiber non-woven fabrics in order to
  • fabrics can comprise staple fibers or filaments.
  • thermoplastic fiber non-woven fabric can be a carded non-woven fabric or an air laid non-woven fabric, etc., if the fabric comprises staple fibers.
  • the staple fibers composing the staple fiber non-woven fabric can contain a single composition, or they can be conjugated fibers comprising at least two
  • compositions for example, three or four compositions.
  • a two-composition conjugated fiber comprising a high melting point polymer and a low melting point polymer will be sufficient for most general purposes.
  • thermoplastic non-woven fabric comprising staple fibers are, for example, polyolefin polymers, polyester polymers and polyamide polymers.
  • polyolefin polymers include polypropylene, high density polyethylene, linear low density polyethylene, ethylene/propylene binary copolymer, and ethylene/butene-1/propylene ternary copolymer.
  • the polyester polymers include polyethylene terephthalate and polybutylene terephthalate.
  • polyamide polymers include nylon 6 and nylon 66. Pigments, flame retarders,
  • deodorants, antistatic agents and antioxidants can be added to the thermoplastic fiber in the range such that the additives do not deteriorate the effects of the invention.
  • the melting points between a high melting point polymer and a low melting point polymer is preferably at least 15°C.
  • multilayer type fiber and sea-island type fiber can be used.
  • the cross section of the fibers for the staple fiber non-woven fabric used for a laminating layer can be circular or various modified shapes such as
  • the fibers can be hollow. Or the non-woven fabric
  • the fineness of the fiber composing the staple fiber non-woven fabric for lamination is not specifically limited, it is preferably 0.5-10d/f. If the fineness is too small, a needle of a hopper feeder will merely thread when the staple fibers are opened. As a result, an uneven staple fiber non-woven fabric
  • the staple fiber will be stiff if
  • the length of the staple fiber is preferably 3-51mm, since a non-woven fabric balanced in bulkiness, openness and homogeneity will be obtained.
  • crimped or uncrimped staple fibers can be used.
  • crimped fibers such as spiral type, zigzag type and U-shape type are preferable due to the good bulkiness.
  • the sheet is not deteriorated in air permeability and liquid impermeability, is improved in feeling, and is excellent in bulkiness and flexibility.
  • thermoplastic fiber non-woven fabric laminated with a melt When a thermoplastic fiber non-woven fabric laminated with a melt
  • blown non-woven fabric of this invention comprises filaments, the filaments can
  • compositions contain a single composition, or it can be a conjugated fiber comprising at least two compositions, for example, three or four compositions. Considering cost, however, a two-composition conjugated fiber comprising a high melting point
  • polymer and a low melting point polymer will be sufficient for most general purposes.
  • Preferable polymer compositions that can be used for the above thermoplastic non-woven fabric comprising filaments are, for example, polyolefin polymers, polyester polymers and polyamide polymers.
  • the polyolefin polymers include polypropylene, high density polyethylene, linear low density polyethylene, ethylene/propylene binary copolymer, and ethylene/butene- 1/propylene ternary copolymer.
  • the polyester polymers include polypropylene, high density polyethylene, linear low density polyethylene, ethylene/propylene binary copolymer, and ethylene/butene- 1/propylene ternary copolymer.
  • polyamide polymers include nylon 6 and nylon 66. Pigments, flame retarders, deodorants, antistatic agents and antioxidants can be added to the thermoplastic fiber in a range such that the additives do not deteriorate the
  • the difference of the melting points between a high melting point polymer and a low melting point polymer is preferably at least l ⁇ t.
  • sheath-core type eccentric sheath-core type, parallel type, multilayer type and sea-island type can be used.
  • the cross section of the filaments can be circular or various modified
  • the fiber can be hollow.
  • the non-woven fabric can be produced by combining these fibers.
  • spun bond method is preferably used for producing the filament non-woven fabric for lamination in this invention, though there is no limitation.
  • the spun bond method is as follows: providing polymer in an extruder; melt-spinning the polymer by using a spinneret; introducing a group of fibers spewed from the spinneret into an air
  • sucker for drawing to obtain filaments; charging the group of filaments from the air sucker by a proper charging device such as a corona discharging device; and opening the group of filaments by passing the filaments through a pair of vibrating flaps or by impacting them on a proper reflecting board etc.;
  • a proper charging device such as a corona discharging device
  • conjugated fibers For producing this filament non-woven fabric, conjugated fibers
  • the filament non-woven fabric is formed by combining low melting point polymer filaments and high melting point polymer filaments, where the difference in the melting points is at least 15 ⁇ .
  • the fineness of the filament non-woven fabric for lamination in this invention is preferably 0.5-10d/f. Too
  • melt blown non-woven fabric and the filament non-woven fabric for lamination for instance, heat- bonding by using embossed rollers, ultrasonic welding, hot air cycle bonding where hot air is blown at a temperature in the range between a low melting point and a high melting point of two kinds of polymers, and a hot melt method
  • a filament non-woven fabric is used for laminating with a melt blown non-woven fabric of this invention, fuzz is reduced while the air permeability and liquid impermeability do not deteriorate, and strength is improved while
  • impermeable sheet for an absorbent article can be provided.
  • a typical example of the liquid impermeable sheet of this invention is
  • the liquid impermeable sheet of this invention can be used for parts of various absorbent articles, where liquid impermeable sheets or water repellent sheets are used, but the whole configuration of the absorbent articles is not specifically limited.
  • FIG. 1 is a plan view of one example of a disposable diaper of this
  • FIG. 2 is a schematic cross-sectional end view taken on line X-X' of FIG. 1.
  • FIG. 3 is a schematic cross-sectional end view taken on line Y-Y' of FIG. 1.
  • liquid absorbent layer to absorb and hold body fluid.
  • the liquid absorbent layer comprises cellulose fiber such as fluff pulp,
  • the liquid absorbent layer 1 can be wrapped with tissue paper as required.
  • Numeral 2 denotes a liquid permeable surface cover provided at the surface (the skin side), comprising a
  • Numeral 3 denotes a back sheet that should be liquid impermeable.
  • a round sheet 4 is not always necessary. In FIGs. 2-3, the round sheet 4 is provided between the liquid absorbent layer 1 and the back sheet 3.
  • Numerals 5 and 5' denote side sheets provided on both sides of the absorbent article in order to prevent liquid such as
  • the side sheets are provided in such a position that they surround and hold the groin or the thighs.
  • Band-like waist gathers may be provided on the waist position skin sides as denoted by 7 and 7' in FIG. 1, though they are not shown in FIGs. 2 and 3. Suitable parts of these members are bonded so that they do not drop, though such description is omitted in the drawings.
  • liquid impermeable sheets In conventional products, liquid impermeable sheets
  • the liquid impermeable sheet of this invention can provide disposable diapers, a kind of absorbent article, which
  • the present sheets for at least one part selected from the group consisting of back sheets, side sheets, round sheets and waist gathers of conventional absorbent articles. It is specifically effective to use the sheet for a back sheet of an absorbent article since it covers a comparatively large surface, and it has a liquid impermeability sufficient for a back sheet and good air permeability and
  • FIG. 4 shows a plan view of an example of a sanitary napkin seen from
  • FIG. 5 shows a schematic cross-section end view taken on line X-X' of this figure.
  • Numeral 1 denotes a liquid absorbent layer.
  • Numeral 2 denotes a liquid absorbent layer.
  • a mesh sheet group consisting of a mesh sheet, a non-woven fabric, a woven fabric and a knitted fabric.
  • 3 denotes a back sheet requiring liquid impermeability; 5 and 5' denote side sheets. Suitable parts of these members are bonded so that they do
  • the liquid impermeable sheet of this invention can provide sanitary napkins, a kind of absorbent article, which have good air permeability and feeling while keeping
  • liquid impermeability by using the sheets for at least one part selected from the group consisting of a back sheet and a side sheet etc. It is specifically effective
  • the pieces were photographed by using a scanning electron microscope (SEM) with a magnifying power of 100-5000. Average value of the fiber diameter (unit: ⁇ m) was obtained by measuring the diameter of total 100 fibers (10 in
  • a non-woven fabric with 5cm width was prepared. Longitudinal and vertical breaking strength (kg/5cm) of the fabric were measured by using a tensile strength tester (AUTOGRAPH AG-500D by Shimadzu Corporation).
  • Weight per lm 2 of a melt blown non-woven fabric was measured, and the thickness of the melt blown non-woven fabric was measured by using a SEM, in order to calculate weight per lcc (unit: g/cc).
  • the average value was calculated from five samples by using an air permeability tester made by Toyoseiki Seisakusho CO., LTD., based on JISL 1004, 1018 (unit: cc/cm 2 /second). [Hydraulic resistance]
  • a web of a melt blown non-woven fabric was obtained by the following steps: melting polypropylene at 330°C;
  • a compression processor comprising smooth rollers that are heated at 120 ⁇ .
  • the web was passed though compressed rollers of a point bond processor comprising embossed and smooth rollers and being heated at 130" ⁇ , so
  • the melt blown non-woven fabric had a fiber diameter (D) of 1.5 ⁇ m, and a basis weight (W) of 27g/m 2 .
  • woven fabric (abbreviated as non-woven fabric density in the Tables) was 0.09g/cc, and the value in the Formula A (Formula A value in Table 1) was 12.
  • melt blown non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air
  • the liquid impermeable sheet was used for back sheets of various absorbent articles shown in FIGs. 1-5, including disposable diapers and sanitary
  • a melt blown non-woven fabric was obtained in the same way as in Example 1, except that the fiber diameter (D) was 1.0 ⁇ m and the Formula A
  • the melt blown non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air permeability while keeping its hydraulic resistance.
  • the condition is shown in Table 1, and the result is shown in Table 2.
  • the liquid impermeable sheet was used for back sheets of various materials
  • absorbent articles shown in FIGs. 1-5 including disposable diapers and sanitary napkins, for wearer evaluation.
  • absorbent articles shown in FIGs. 1-5 including disposable diapers and sanitary napkins, for wearer evaluation.
  • a melt blown non-woven fabric was obtained in the same way as in
  • Example 1 except that the density (d) was 0.08g/cc, the basis weight (W) was 10g/m 2 and the Formula A value was 4.4.
  • thermoplastic fiber non-woven fabric for lamination was obtained in the following steps: melting polypropylene at 300°C and melting polyethylene at 220t;
  • the laminate was passed through compressed rollers of a point bond processor having embossed and smooth rollers heated at 128t, so that the fibers were partially heat-bonded.
  • the part of the laminated melt blown non-woven fabric had an
  • the melt blown non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air permeability while keeping its hydraulic resistance.
  • the non-woven fabric strength was also improved by laminating a filament non-woven fabric. The condition is shown in Table 1, and the result is shown in Table 2.
  • the liquid impermeable sheet comprising the laminated non-woven fabric was used for back sheets of various absorbent articles shown in FIGs. 1-5, including disposable diapers and sanitary napkins, for wearer evaluation. As a result, there was no leakage of body fluid to the outside of the absorbent articles,
  • a web of a melt blown non-woven fabric with fiber diameter (D) of 1.5 ⁇ m and basis weight (W) of 10g/m 2 was obtained by the following steps:
  • thermoplastic non-woven fabric for lamination was obtained in the same way as Example 3.
  • the filament fleece was laminated on the above melt blown non-woven fabric, and the fibers of the laminate were partially heat-bonded to each other by passing the laminate through compressed rollers of a point bond processor comprising embossed and smooth rollers heated at 126t.
  • the apparent density (d) of the melt blown non-woven fabric was 0.08/cc and Formula A value was 4.4 after the lamination.
  • melt blown non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air
  • the liquid impermeable sheet comprising the laminated non-woven
  • polypropylene at 330 ⁇ ; providing the polymers from respective extruders to a sheath-core type conjugating spinneret heated at 300°C for melt-spinning in order to obtain
  • sheath-core type conjugated fibers (the sheath is the ternary copolymer and the core is polypropylene);
  • the apparent density (d) of the melt blown non-woven fabric was 0.08/cc and Formula A value was 4.4 after the lamination.
  • the melt blown non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air permeability with less fuzz, while maintaining its hydraulic resistance.
  • the non-woven fabric strength was also improved by laminating filament non-woven
  • ⁇ m and basis weight (W) of 10g/m 2 was obtained by the following steps: melting polyethylene at 220°C and melting polypropylene at 330°C;
  • Fibers of 2.5d/f were prepared for a thermoplastic fiber non-woven fabric used for lamination by the following steps: melting polypropylene at 300°C and melting polyethylene at 220 ⁇ ;
  • spun eccentric sheath-core type fibers winding the spun eccentric sheath-core type fibers (sheath composition is polyethylene and core composition is polypropylene) around a bobbin;
  • the fibers were cut to be 38mm long, being passed through a carding machine, so that a web of a staple fiber non-woven fabric was prepared.
  • the staple fiber non-woven fabric web was laminated on the melt blown non-woven fabric, and the fibers of the laminate were partially bonded to each other by passing the laminate through compressed rollers of a point bond processor comprising embossed and smooth rollers heated at 126°C.
  • the melt blown non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air permeability while keeping its hydraulic resistance.
  • the non-woven fabric was proper for a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air permeability while keeping its hydraulic resistance.
  • the liquid impermeable sheet comprising the laminated non-woven fabric was used for back sheets of various absorbent articles shown in FIGs. 1-5, including disposable diapers and sanitary napkins, for wearer evaluation.
  • various absorbent articles shown in FIGs. 1-5 including disposable diapers and sanitary napkins, for wearer evaluation.
  • a melt blown non-woven fabric web was obtained in the same way as Example 5, except that a combination type spinneret was used.
  • a melt blown non-woven fabric web comprising combined fibers of polypropylene ultra fine fibers and propylene-ethylene-butene-1 ternary copolymer ultra fine fibers was obtained.
  • thermoplastic fiber non-woven fabric used for lamination was obtained in the same way as Example 5 except that an
  • the filament fleece was laminated on the melt blown non-woven fabric, and the fibers of the laminate were partially bonded to each other by passing the laminate through compressed rollers of a point bond processor comprising embossed and smooth rollers heated at 128°C.
  • the apparent density (d) of the melt blown non-woven fabric was 0.08/cc and Formula A value was 4.4 after the lamination.
  • the melt blown non-woven fabric was proper to a liquid impermeable sheet for an absorbent article since it was excellent in feeling, flexibility and air permeability with less fuzz while keeping its hydraulic resistance.
  • the non- woven fabric strength was also improved by a filament non-woven fabric.
  • the liquid impermeable sheet comprising the laminated non-woven fabric was used for back sheets of various absorbent articles shown in FIGs. 1-5,
  • a melt blown non-woven fabric web was prepared in the same way as Example 1 except that the basis weight (W) was 20g/m 2 and compressing
  • a point bond processor comprising embossed and smooth rollers heated at 130°C.
  • the melt blown laminated non-woven fabric had good air permeability, however, it was not appropriate for a liquid impermeable sheet used in an absorbent article, as it did not keep its hydraulic resistance. The condition is
  • the liquid impermeable sheet was used for back sheets of various absorbent articles shown in FIGs. 1-5, including disposable diapers and sanitary
  • a melt blown non-woven fabric was produced in the same way as Example 7 except that the basis weight of the non-woven fabric was 4g/m 2 , and a filament fleece for a thermoplastic fiber non-woven fabric to be laminated on the
  • melt blown non-woven fabric web was produced in the same way as Example 7.
  • the filament fleece was laminated on the melt blown non-woven fabric, and the fibers of the laminate were partially bonded to each other by passing the
  • the apparent density (d) of the melt blown non-woven fabric was 0.09g/cc, but Formula A value was 1.8 after the lamination.
  • the melt blow laminated non-woven fabric had good air permeability
  • the liquid impermeable sheet comprising the laminated non-woven fabric was used for back sheets of various absorbent articles shown in FIGs. 1-5,
  • Fibers of 2.5d/f were prepared for a thermoplastic fiber non-woven fabric to be laminated, by the following steps: melting polypropylene at 300t and melting polyethylene at 220°C;
  • spun eccentric sheath-core type conjugated fibers sheath composition is polyethylene and core composition is polypropylene
  • the fibers were cut to be 38mm long, being passed through a carding machine, and webs of a staple fiber non-woven fabric were prepared.
  • the staple fiber non-woven fabric web was laminated on the melt blown
  • non-woven fabric and the fibers of the laminate were partially bonded to each other by passing the laminate through compressed rollers of a point bond processor comprising embossed and smooth rollers heated at 126 * 0.
  • melt blow laminated non-woven fabric had good air permeability, however, it was not appropriate for a liquid impermeable sheet used in an
  • the liquid impermeable sheet comprising the laminated non-woven fabric was used for back sheets of various absorbent articles shown in FIGs. 1-5, including disposable diapers and sanitary napkins, for wearer evaluation. As a result, the evaluation was bad due to body fluid leakage to the outside of the
  • PE polyethylene

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

Abstract

Feuille imperméable aux liquides composée d'un non-tissé de microfibres et article absorbant mettant en application ladite feuille. Ce non-tissé de microfibres est composé de fibres ultrafines en polymère thermoplastique filées au moyen d'un procédé de fusion-soufflage, le diamètre des fibres étant égal ou inférieur à 10 νm. Ce non-tissé de microfibres répond aux formules suivantes A: 2≤W/D2≤200 et B: 0.05≤d≤s≤0.2 dans lesquelles W représente le poids de base (g/m2), D représente le diamètre de la fibre (νm) et d représente la densité apparente du non-tissé (g/cc), ce qui confère à ce dernier un toucher, une souplesse et une perméabilité à l'air excellents, tout en lui conservant son imperméabilité aux liquides.
PCT/JP1997/004134 1996-11-15 1997-11-12 Feuille en non-tisse impermeable aux liquides pour article absorbant WO1998022056A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP52345498A JP4442932B2 (ja) 1996-11-15 1997-11-12 吸収性物品用液体非透過性シート
DE19782125A DE19782125C2 (de) 1996-11-15 1997-11-12 Eine für Flüssigkeit undurchlässige Vlieslage für einen absorbierenden Artikel
DE19782125T DE19782125T1 (de) 1996-11-15 1997-11-12 Eine für Flüssigkeit undurchlässige Vlieslage
AU49651/97A AU4965197A (en) 1996-11-15 1997-11-12 Liquid impermeable nonwoven sheet for absorbent article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/305296 1996-11-15
JP30529696 1996-11-15

Publications (1)

Publication Number Publication Date
WO1998022056A1 true WO1998022056A1 (fr) 1998-05-28

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JP (1) JP4442932B2 (fr)
AU (1) AU4965197A (fr)
DE (2) DE19782125T1 (fr)
WO (1) WO1998022056A1 (fr)

Cited By (5)

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WO2001021125A1 (fr) * 1999-09-17 2001-03-29 Pegas A.S. Garniture non tissee pour articles absorbants
WO2001045609A1 (fr) * 1999-12-22 2001-06-28 The Procter & Gamble Company Vetement jetable comportant une couche de support non tissee obtenue par fusion-soufflage
CN100382953C (zh) * 2003-03-19 2008-04-23 旭化成纤维株式会社 高耐水压聚酯无纺布
CN113939258A (zh) * 2019-06-03 2022-01-14 宝洁公司 深色非织造纤维网
US12232938B2 (en) 2019-06-03 2025-02-25 The Procter & Gamble Company Dark-tinted nonwoven webs

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JP3607276B1 (ja) * 2003-06-18 2005-01-05 株式会社アルケー企画 おむつ
US8395016B2 (en) * 2003-06-30 2013-03-12 The Procter & Gamble Company Articles containing nanofibers produced from low melt flow rate polymers
US20070095454A1 (en) * 2004-09-02 2007-05-03 Panther Allen L Ultrasonic joining of polymer mats to mechanical devices including electric appliances
DE102009034539A1 (de) * 2009-07-23 2011-01-27 Bvp Gmbh Vorrichtung und Verfahren zur Aktivierung von Blutgerinnungsreaktionen
CN103668791A (zh) * 2013-11-30 2014-03-26 江苏奥森新材料有限公司 无纺布湿帘的生产方法
WO2020250481A1 (fr) * 2019-06-11 2020-12-17 花王株式会社 Tissu non tissé stratifié pour article absorbant
US12121431B2 (en) 2019-10-07 2024-10-22 The Procter & Gamble Company Durable underwear adapted for use with absorbent component
EP4096607B1 (fr) * 2020-01-27 2024-07-24 The Procter & Gamble Company Culotte absorbante durable
US12258692B2 (en) * 2022-03-01 2025-03-25 Elc Management Llc Cosmetic sheet masks for improved product delivery

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EP0640329A1 (fr) * 1993-08-23 1995-03-01 Hercules Incorporated Tissus d'éléments d'arrêt, éléments d'arrêt et articles protecteurs incorporant de tels éléments
WO1996007376A1 (fr) * 1994-09-09 1996-03-14 Kimberly-Clark Worldwide, Inc. Stratifie non-tisse thermoformable formant barriere

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US4713068A (en) * 1986-10-31 1987-12-15 Kimberly-Clark Corporation Breathable clothlike barrier having controlled structure defensive composite
EP0640329A1 (fr) * 1993-08-23 1995-03-01 Hercules Incorporated Tissus d'éléments d'arrêt, éléments d'arrêt et articles protecteurs incorporant de tels éléments
WO1996007376A1 (fr) * 1994-09-09 1996-03-14 Kimberly-Clark Worldwide, Inc. Stratifie non-tisse thermoformable formant barriere

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001021125A1 (fr) * 1999-09-17 2001-03-29 Pegas A.S. Garniture non tissee pour articles absorbants
WO2001045609A1 (fr) * 1999-12-22 2001-06-28 The Procter & Gamble Company Vetement jetable comportant une couche de support non tissee obtenue par fusion-soufflage
WO2001045617A1 (fr) * 1999-12-22 2001-06-28 The Procter & Gamble Company Vetement jetable comprenant une feuille de support en non-tisse de fusion-soufflage
JP2011177549A (ja) * 1999-12-22 2011-09-15 Procter & Gamble Co メルトブロウン不織布バックシートを含む使い捨て衣類
CN100382953C (zh) * 2003-03-19 2008-04-23 旭化成纤维株式会社 高耐水压聚酯无纺布
CN113939258A (zh) * 2019-06-03 2022-01-14 宝洁公司 深色非织造纤维网
US12042364B2 (en) 2019-06-03 2024-07-23 The Procter & Gamble Company Dark-tinted nonwoven webs
US12232938B2 (en) 2019-06-03 2025-02-25 The Procter & Gamble Company Dark-tinted nonwoven webs

Also Published As

Publication number Publication date
JP2001504723A (ja) 2001-04-10
US20020004349A1 (en) 2002-01-10
JP4442932B2 (ja) 2010-03-31
DE19782125C2 (de) 2002-07-11
AU4965197A (en) 1998-06-10
DE19782125T1 (de) 1999-09-30

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