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
  • 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
  • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
  • A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
  • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
  • D04H1/559—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving the fibres being within layered webs
• • 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
  • A61F2013/51182—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers with non-continuous bonding

Definitions

• TECHNICAL FIELD The present invention relates to a three-dimensional sheet having desired irregularities on its surface and a bulky structure.
• BACKGROUND ART Japanese Patent No. 31315557 discloses a first fiber layer containing a heat-shrinkable fiber and a heat-fusible fiber made of a resin having a melting point lower than the heat-shrinkage onset temperature of the heat-shrinkable fiber. It describes a multi-wrinkled nonwoven fabric in which a second fiber layer made of non-heat-shrinkable fibers is laminated on one side. The two fiber layers are integrated in the thickness direction by linear heat fusion, the heat fusion parts are concave parts, and the heat fusion parts are convex parts. Wrinkles are formed.
• This multi-wrinkled nonwoven fabric is obtained by laminating a first fiber layer and a second fiber layer, and integrating the two fiber layers by heat fusion at a temperature lower than the heat shrinkage starting temperature of the heat shrinkable fibers.
• the heat-shrinkable fiber is obtained by blowing hot air having a temperature equal to or higher than the heat-shrinkage temperature to heat-shrink the heat-shrinkable fiber.
• the heat fusion between the first fiber layer and the second fiber layer depends on the heat fusion fibers contained in the first fiber layer in an amount of 30 to 50% by weight or more, both fibers The bonding strength of the layers is limited.
• the heat-sealed portion is easily peeled off during the heat shrinkage of the first fiber layer and during the post-processing and use of the nonwoven fabric.
• the uneven pattern may become unclear or a desired uneven shape may not be obtained.
• the heat-shrinkable fiber has a shrinking temperature higher than the melting point of the heat-fusible fiber, the heat-sealable fiber melts during shrinkage, resulting in a poor feel and is not suitable for a sheet that directly touches the skin.
• the ratio of the heat-shrinkable fibers may decrease, and the shrinkage of the first fiber layer may become insufficient, so that a desired uneven shape may not be obtained.
• the flexibility of the entire sheet is reduced, and the texture is deteriorated.
• Patent No. 3118195 discloses that one of the first and second fiber layers laminated and partially heat-sealed as a non-woven cloth used for a female material of a hook-and-loop fastener. It describes a nonwoven fabric in which the other is protruded to one side by shrinking to form regular convex portions.
• an object of the present invention is to provide a three-dimensional sheet which has a good feel, is excellent in thermocompression bonding to other materials and the like, and is capable of forming desired irregularities during manufacturing.
• Another object of the present invention is to provide a method for fixing a three-dimensional sheet that can firmly join a three-dimensional sheet using heat-shrinkable fibers to an object to be fixed made of a fibrous material.
• the present invention is characterized in that a second fiber layer mainly composed of non-heat-shrinkable fibers and containing heat-fusible fibers is laminated on one surface of a first fiber layer containing heat-shrinkable heat-shrinkable fibers, A three-dimensional sheet in which a third fiber layer containing heat-fusible fibers is laminated on the other surface, wherein the first to third fiber layers form a heat-fused portion in a predetermined pattern on the three-dimensional sheet.
• the heat-fused portion extends from the second fiber layer to the third fiber layer, and the second fiber layer provides a three-dimensional sheet in which a portion other than the heat-fused portion has a convex shape.
• a first fiber layer containing heat-shrinkable fibers is laminated on one side with a second fiber layer mainly containing non-heat-shrinkable fibers and containing heat-fusible fibers, and the first and second fibers
• This is a method of fixing a three-dimensional sheet in which a three-dimensional sheet in which a layer forms a joint of a predetermined pattern is fixed to an object to be fixed made of a fiber material, with the second fiber layer side fixed to the object.
• a third fiber layer containing a heat-fusible fiber is interposed between the three-dimensional sheet and the object to be fixed, and a three-dimensional sheet fixing method is provided in which these are integrated by hot embossing.
• FIG. 1 is a schematic cross-sectional view showing a three-dimensional sheet as one embodiment of the three-dimensional sheet of the present invention (first invention) together with an object to be fixed when the three-dimensional sheet is used.
• 2 (a) to 2 (c) are plan views each showing an example of a formation pattern of the heat-sealed portions formed on the three-dimensional sheet.
• FIG. 3 is a schematic cross-sectional view showing a cross section in the width direction of a sanitary napkin (absorbent article) manufactured using a three-dimensional sheet.
• FIG. 4 schematically shows a cross-sectional view of a three-dimensional sheet 10 as one embodiment of the present invention (first invention).
• the second fiber layer 2 is laminated on one surface of the first fiber layer 1 containing the heat-shrinkable fiber, and the third fiber layer 3 is laminated on the other surface of the first fiber layer 1. It has a three-layer structure.
• the first fiber layer 1 is composed of an aggregate of fibers.
• the second fiber layer 2 and the third fiber layer 3 are each composed of an aggregate of fibers of a different type and / or blend from the fibers constituting the first fiber layer 1.
• the second fiber layer 2 and the third fiber layer 3 are composed of an aggregate of fibers of the same type and composition, or an aggregate of fibers of different types and / or composition.
• the heat-sealed portion 4 extends from the second fiber layer 2 to the third fiber layer 3.
• the joint portion between the second fiber layer and the first fiber layer and the joint portion between the first fiber layer and the third fiber layer completely overlap each other when the three-dimensional sheet 10 is viewed in plan. .
• the heat-sealed portion 4 is formed by melting and solidifying the heat-sealed resin.
• the heat-fusible resin is preferably contained in the second fiber layer 2 and the third fiber layer 3 in the form of a heat-fusible fiber containing the same, and the heat-fusible resin Even if the resin in the first fiber layer is not melted at all, the resin penetrates and melts and adheres to each other, enabling three-layer bonding.
• the heat-sealed portion 4 preferably extends from the second fiber layer to the third fiber layer in all of the heat-sealed portions of the three-dimensional sheet 10. It is preferable to cover the entire area of the three-dimensional sheet in the thickness direction.
• the individual heat-sealed portions in the present embodiment are circular, the shape of each heat-sealed portion may be elliptical, triangular, rectangular, or a combination thereof.
• the joining portion may be formed in a continuous shape, for example, a linear shape such as a straight line or a curved line.
• the formation pattern of the heat-sealed portion 4 can be, for example, a pattern as shown in FIGS.
• the area ratio of the heat-sealed portion 4 to the area of the three-dimensional sheet 10 depends on the specific use of the three-dimensional sheet 10.
• Thermal bonding is used to increase the bonding strength of the first to third fiber layers sufficiently and to sufficiently form a convex three-dimensional shape by deformation of the second fiber layer to express bulkiness.
• the content is 3 to 50%, particularly 5 to 35%, and after the heat shrinkage, 6 to 90%, particularly 10 to 70%.
• the three-dimensional sheet 10 is formed by partially compressing the first to third fiber layers in a laminated state by heat compression and integrating them, and then shrinking the heat-shrinkable fibers contained in the first fiber layer 1. It is manufactured by heat treatment at a temperature equal to or higher than the starting temperature, and due to the heat shrinkage of the first fiber layer, a portion of the second fiber layer 2 other than the above-mentioned 4 parts of heat fusion has a convex shape.
• the three-dimensional sheet 10 has a large number of closed regions surrounded by a heat-sealed portion 4 having a rhombic lattice pattern, as shown in FIG.
• the second fiber layer 2 is deformed into a dome-shaped convex shape.
• the heat-sealed portion 4 is relatively concave as compared with the portion where the second fiber layer 2 has a convex shape (also referred to as a convex portion 5), so that the three-dimensional sheet 10 has the second fiber layer side.
• an uneven shape composed of a number of convex portions and concave portions is formed.
• a similar uneven shape is also formed on the third fiber layer 3 side due to the contraction of the first fiber layer 1.
• the first fiber layer 1 contains heat shrinkable fibers. This heat-shrinkable fiber is in a heat-shrinkable state in the three-dimensional sheet 10.
• heat-shrinkable fibers can be used without particular limitation. It is preferable to use latently crimpable fibers as the heat-shrinkable fibers because the first fiber layer 1 is given an elastomer-like property and the three-dimensional sheet 10 as a whole exhibits the elastomer-like property. .
• latently crimpable fibers as the heat-shrinkable fibers because the first fiber layer 1 is given an elastomer-like property and the three-dimensional sheet 10 as a whole exhibits the elastomer-like property.
• the three-dimensional sheet 10 has an elastomeric property
• the three-dimensional sheet 10 is used, for example, as a constituent member of a disposable absorbent article to be described later, the followability to the wearer's movement is improved, and the absorption is improved. It is preferable because the fitting property of the conductive article is improved and liquid leakage is effectively prevented.
• the latently crimpable fiber is, for example, an eccentric core-sheath type composite fiber or a side-by-side type composite fiber containing two types of thermoplastic polymer materials having different shrinkage rates. Examples thereof include those described in Japanese Patent Application Laid-Open No. 9-296325 and Japanese Patent No. 2759531.
• thermoplastic polymer materials having different shrinkage ratios include, for example, a combination of ethylene-propylene random copolymer (EP) and polypropylene (PP), Examples include a combination of polyethylene terephthalate (PET) and a copolymer of polyethylene terephthalate and polyethylene isophthalate (Co PET).
• the heat-shrinkable fibers may be short fiber stable fibers or long fiber filaments.
• the thickness is preferably about l to 7 dtex.
• the heat shrink start temperature of the heat shrinkable fiber can be, for example, 90 to 110 :.
• the thermal shrinkage starting temperature is the measured temperature when the fiber starts to shrink substantially when the fiber is placed in a furnace that can be heated and heated at a constant rate.
• the first fiber layer 1 may be composed of 100% heat-shrinkable fibers or may contain other fibers. Examples of the other fibers to be included in the first fiber layer 1 include heat-sealed fibers described later, for example, heat-sealed fibers included in the second and Z or third fiber layers.
• the amount of the heat-shrinkable fibers is set to be equal to or larger than that of the heat-shrinkable fibers from the viewpoint of preventing the shrinkage of the heat-shrinkable fibers during the production of the three-dimensional sheet. It is preferably at least 70% by weight, especially 90 to 100% by weight, based on the weight of one fiber layer 1.
• the form of the first fiber layer 1 before heat shrinkage include a web or a nonwoven fabric in which constituent fibers are in an unbonded state.
• Examples of the first fiber layer 1 in the form of a web include webs containing heat-shrinkable fibers and formed by a card method.
• Examples of the first fiber layer 1 in the form of a nonwoven fabric include nonwoven fabrics containing heat-shrinkable fibers and manufactured by various nonwoven fabric manufacturing methods.
• Non-woven fabric production methods include the heat fusion method, the hydroentanglement method, the needle punch method, the solvent bonding method, the spun pond method, and the melt blown method.
• the second fiber layer 2 is mainly composed of non-heat-shrinkable fibers.
• non-heat-shrinkable fibers are fibers that do not show heat shrinkage and that show heat shrinkage but are substantially below the heat shrinkage onset temperature of the heat-shrinkable fibers contained in the first fiber layer. Including both non-heat shrinkable fibers.
• the amount of the non-heat-shrinkable fibers in the second fiber layer 2 is at least 70% by weight or more, preferably 90% by weight or more, particularly 100% by weight based on the weight of the second fiber layer 2. % Is preferable because the first fiber layer becomes more three-dimensional.
• the second fiber layer contains about 10 to 30% by weight of the same heat-shrinkable fiber as the heat-shrinkable fiber in the first fiber layer. Is preferred.
• the second fiber layer 2 and the third fiber layer 3 each contain heat-fusible fibers.
• the heat fusible fiber contains a heat fusible resin, and the fibers can be fused to each other by melting and solidifying the resin.
• the heat-fusible fibers contained in the second fiber layer 2 and the third fiber layer 3 each contain a heat-fusible resin having a melting point lower than the melting point of the heat-shrinkable fiber contained in the first fiber layer 1. Is preferable from the viewpoint of further improving the bonding strength of the heat-sealed portion. If the heat-shrinkable fiber in the first fiber layer is a core-in-sheath (eccentric or concentric) composite fiber or a side-by-side composite fiber, the second and third fiber layers are used.
• the melting point of the heat-shrinkable fiber refers to the peak value when the heat of fusion is measured by DSC (differential scanning calorimeter).
• the melting point of the fat is 10 or more, especially 20 or more, lower than the melting point of the heat-shrinkable fiber of the first fiber layer. This is preferable because the fused fibers can be melted and bonded.
• the heat-fusible fiber is a multicomponent conjugate fiber
• the heat-fusible resin having the lowest melting point is lower than the melting point of the heat-shrinkable fibers in the first fiber layer.
• the melting point of the heat-fusible resin in the heat-fusible fibers contained in the second fiber layer 2 and the third fiber layer 3 is 3 O or more higher than the heat shrink temperature of the heat-shrinkable fibers in the first fiber layer.
• it is preferably at least 40 "C lower in that the heat-fused fibers contained in the second fiber layer can be melted to form a bond having sufficient adhesive strength without shrinking the first fiber layer.
• the melting point of the heat-sealing resin in the heat-sealing fibers contained in the fiber layer 2 and the melting point of the heat-sealing resin in the heat-sealing fibers included in the third fiber layer 3 are the same, or When the difference between the melting points of these two heat-sealing resins is within 20 "C, particularly within 10 or less, the bonding strength of the first to third fiber layers can be further improved.
• the heat treatment temperature for integration can be performed at a relatively low temperature, and the texture of the three-dimensional sheet can be further improved. Et al preferred.
• the amount of the heat-sealed fibers contained in the second fiber layer is It is preferably from 70 to 100% by weight, particularly preferably from 90 to 100% by weight, based on the weight.
• the amount of the heat-fused fibers contained in the third fiber layer is such that the bonding strength between the fiber layers in the heat-sealed portion 4 is improved and the texture of the three-dimensional sheet is improved, and other materials, especially fiber materials From the viewpoint of improving the thermocompression bonding property It is preferably from 70 to 100% by weight, particularly preferably from 90 to 100% by weight, based on the weight of the third fiber layer 3.
• Examples of the heat-sealing fibers contained in the second fiber layer 2 and the third fiber layer 3 include polyethylene (PE), polypropylene (PP), polyethylene-propylene copolymer, polyethylene terephthalate (PET), and polybutylene terephthalate.
• Polyester polyethylene terephthalate-ethylene isophthalate copolymer, polyamide-ethylene acrylic acid copolymer, I-ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer Fibers made of a polymer, an ethylene-ethyl methacrylate copolymer, an ethylene-methyl acrylate-acrylic terpolymer, and the like are included.
• a core-sheath type composite fiber or a side-by-side type composite fiber composed of a combination of these thermoplastic polymer materials can also be used. These fibers may be short fiber staple fibers or long fiber filaments. The thickness is preferably about l to 7 dtex.
• the first fiber layer 1 contains the heat-fusible fibers
• the same heat-fusible fibers can be used.
• Examples of the form of the second and third fiber layers 2 and 3 before the first fiber layer 1 thermally shrinks include a web or a nonwoven fabric in which constituent fibers are in an unbonded state.
• the shapes of the second fiber layer 2 and the third fiber layer 3 before the heat shrinkage may be the same or different.
• the form of the second fiber layer is a web form in particular, it is easy to change the area or shape of the second fiber layer 2 by shrinkage, and the second fiber layer 2 can be raised in a convex shape in the thickness direction. It is preferable because it becomes easy. In addition, since the inside of the raised convex portion is filled with fibers, a sheet having a rich cushioning property and a soft texture can be obtained, which is preferable.
• the web It can be formed by the C method.
• the second fiber layer 2 On the three-dimensional sheet 10 in which the second fiber layer 2 is formed from such a web, a convex portion 5 which is bulky and is filled with the fibers constituting the web is formed, and the fibers are along the convex portion 5.
• the second fiber layer 2 when the second fiber layer 2 is in the form of a web formed by the card method, the second fiber layer 2 has an extremely sparse structure, and the three-dimensional sheet 10 of the present invention has a high viscosity liquid. Can be transmitted and held. Further, the compressive deformability when the three-dimensional sheet 10 is compressed in the thickness direction is also increased.
• the liquid having a high viscosity include loose stool or menstrual blood, a personal-use detergent or humectant, or an object-use detergent.
• the form of the second fiber layer is a nonwoven fabric before joining and shrinking
• advantages of good transportability and high strength since it is not necessary to fuse the constituent fibers of the second fiber layer after bonding with the first fiber layer, there is an advantage that the selection range of the shrink temperature is wide.
• the three-dimensional sheet 10 of the present embodiment for example, the first to third fiber layers are respectively manufactured using a known method, and the first fiber layer 1 is provided between the second fiber layer 2 and the third fiber layer 3.
• the laminated first to third fibrous layers are partially patterned in a predetermined pattern by a concavo-convex roll or a hot embossing roll device composed of a concavo-convex roll and a smooth roll.
• the heat-shrinkable fiber is obtained by heat-pressing, and then contracting the heat-shrinkable fiber contained in the first fiber layer 1 by heat treatment at a temperature equal to or higher than the heat-shrinkage starting temperature.
• a method such as microwave, steam, infrared rays, or contact with a heat roll can be used in addition to a method of passing or blowing hot air through the first to third fiber layers that are integrated. .
• the heat-sealed portion 4 having a predetermined pattern is formed so as to extend from the second fiber layer to the third fiber layer. Therefore, the second fiber layer in the heat-sealed portion 4 From the first fiber layer to the third fiber layer. For this reason, for example, thermocompression bonding at the time of manufacturing at a relatively low temperature can be performed while maintaining sufficient shrinkage of the first fiber layer and sufficient bonding strength from the second fiber layer to the third fiber layer. it can. Therefore, it is possible to obtain a three-dimensional sheet having a soft and good texture.
• the third fiber layer side is subjected to thermocompression bonding (hot embossing or the like) toward another material or the like (also referred to as an object 6) to which the three-dimensional sheet 10 is to be fixed. Can be firmly thermocompression-bonded to the other material or the like, and peeling hardly occurs between the three-dimensional sheet 10 and the object to be fixed.
• the three-dimensional sheet 10 having the above-described configuration is subjected to heat embossing, and as an object to be fixed 6 made of a fiber material, an absorbent body 61 of a sanitary napkin (absorbent article) and a leak-proof sheet 6 2 2 shows a state where the third fiber layer side is fixed to the object side.
• the three-dimensional sheet 10 is thermocompression-bonded to the surface of the absorbent body 61 on the skin contact surface side by heat embossing using a heat seal device in the central region of the sanitary napkin.
• an annular central leak-proof groove is formed on the skin contact surface of the sanitary napkin.
• the three-dimensional sheet 10 is thermocompression-bonded on the leak-proof sheet disposed on the absorber 61 by heat embossing by a heat sealing device on both sides in the longitudinal direction of the sanitary napkin in the same manner. Due to this thermocompression bonding portion 72, a pair of side leakage prevention grooves are formed on both sides of the central leakage prevention groove on the skin contact surface of the sanitary napkin.
• the surface of the absorbent body in the thermocompression bonding section 71 is formed of a backing made of a cellulosic fiber material
• the leak-proof sheet 62 in the thermocompression bonding section 72 is formed of a cellulose fiber material. It is made of laminated polyethylene. Since the leakproof sheet 62 has better adhesiveness, it is used with the laminate (polyethylene) side facing the surface sheet side. (The same applies to Examples and Comparative Examples described later).
• the heat-fused resin in the third fiber layer melts and solidifies in the state of being cut between the constituent fibers of the object 6. Therefore, separation between the three-dimensional sheet 10 and these fixed objects 6 is unlikely to occur.
• a heat seal device for forming a groove or a heat seal device for forming an end seal portion which is conventionally used in sanitary napkins and disposable diapers, can be used.
• FIG. 3 illustration of the unevenness and the like formed on the surface of the three-dimensional sheet 10 is omitted.
• a three-dimensional sheet 10 is used as a liquid-permeable surface material (top sheet), and the three-dimensional sheet 10 and a liquid-impermeable back material (back sheet) 8
• the liquid-retentive absorber 61 is interposed between them.
• FIG. 4 is a view showing a preferred embodiment of the method for fixing a three-dimensional sheet of the present invention (the second invention).
• the three-dimensional sheet 10 ′ shown in FIG. 4 has one surface of the first fiber layer 1 containing heat-shrinkable fibers.
• a second fiber layer 2 mainly composed of non-heat-shrinkable fibers and containing heat-fusible fibers, and the first and second fiber layers 1 and 2 are heat-sealed portions having a predetermined pattern.
• the three-dimensional sheet 10 ′ forming the joint portion 4.
• the three-dimensional sheet 10 ′ has the same configuration as the three-dimensional sheet 10 described above, except that the third fiber layer is not laminated on the other surface of the first fiber layer 1.
• the first fiber layer 1 and the second fiber layer 2 are heat-sealed in the same pattern as the three-dimensional sheet 10, thereby forming the heat-sealed portion 4 of the predetermined pattern. Have been.
• the three-dimensional sheet 10 ′ is fixed to the absorbent body 6 1 of a sanitary napkin (absorbent article) as the fixed object 6 made of a fiber material by hot embossing.
• a third fiber layer containing a heat-fusible fiber manufactured separately from the three-dimensional sheet 10 ′ is interposed between the second fiber layer 2 of the three-dimensional sheet 10 ′ and the object 6. Then, hot embossing is performed from the three-dimensional sheet 10 'side.
• the heat-fused fibers in the first fiber layer and the third fiber layer are formed.
• the fusion between the second fiber layer 2 and the third fiber layer 3 is extremely strongly joined and integrated by the fusion and solidification of the heat fusion resin, and the heat fusion resin in the third fiber layer during the hot embossing.
• Structure of the fixed object Since the solidified material is melted and solidified while being cut between the fibers, sufficient bonding strength can be obtained between the three-dimensional sheet and these fixed objects.
• the present invention is not limited to the above embodiment.
• the three-dimensional sheet of the present invention is suitably used, for example, as a component of a disposable article that is discarded after one or several uses. It can also be used as a female material (loop material) or pulp material for hook-and-loop fasteners. In particular, it is suitable as a component of disposable absorbent articles such as sanitary napkins and disposable diapers, and disposable wipers such as cleaning wipers and personal wipers.
• a component of a disposable absorbent article for example, an absorbent article having a liquid-permeable surface material, a liquid-impermeable backing material, and an absorber interposed between the sheets
• It can be used as a part of a component, for example, as a part of any of the surface material, back material or side solid guard.
• a base of a disposable wiper is used. Material sheet and the like.
• the effect of the present invention is particularly effective in the case of a fixed object made of a fiber material, particularly in the case of a soft fixed object that is deformed by compression, such as the above-described absorbent body of a disposable absorbent article such as a sanitary napkin or a disposable diaper. It is particularly pronounced.
• a fixed object made of a fiber material particularly in the case of a soft fixed object that is deformed by compression, such as the above-described absorbent body of a disposable absorbent article such as a sanitary napkin or a disposable diaper. It is particularly pronounced.
• the present invention will be described in more detail by way of examples. However, the scope of the present invention is not limited to such an embodiment.
• embossing roll embossing ratio: 28%, temperature condition: pattern 144, speed: 80 m / min
• a web is formed with a roller card, and then passed through an air-through heat treatment machine (temperature: 13 mZmin, through-air velocity lm / se (;, treatment time: about 10 seconds) to obtain a basis weight.
• An air-through nonwoven fabric of the second fiber layer of 12 g / m 2 was formed.
• each of the obtained three-dimensional sheets as a surface material for an absorbent article, 100 or more sanitary napkins having the cross-sectional configuration shown in FIG. Produced.
• Each three-dimensional sheet heating Bok seal temperature 1 9 0 by (hot embossing) mount the absorber 61 (basis weight of about 2 5 0 g / m 2) ( basis weight of about 1 6 g / m 2) Paper on which a water-repellent polyethylene sheet is laminated by heat sealing (heat embossing) at a temperature of 200 (laminate unit basis weight: about 7 g / m 2 , paper) It was fixed on a leak-proof sheet 62 having a basis weight of 16 g / m 2 ).
• thermocompression bonding part 71 fixed on the absorber 61 and the thermocompression bonding part 72 fixed on the leak-proof sheet 62 is determined by checking whether the pattern part is floating.
• the three-dimensional sheet of the example (the product of the present invention) is excellent in thermocompression bonding property to the absorber and the leak-proof sheet, and is fixed to another material such as fiber material.
• Excellent thermocompression bonding property On the other hand, in the three-dimensional sheet of the comparative example, a part of the mold of the seal block is slightly unclear or partially or entirely floated, and there is a problem in product performance.
• INDUSTRIAL APPLICABILITY The three-dimensional sheet of the present invention has a good feel, is excellent in thermocompression bonding to other materials, and can form desired irregularities during manufacturing. According to the method for fixing a three-dimensional sheet of the present invention, a three-dimensional sheet using heat-shrinkable fibers can be firmly bonded to an object to be fixed made of a fiber material.

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

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• 2002
  • 2002-03-25 JP JP2002084397A patent/JP3883460B2/ja not_active Expired - Fee Related
  • 2002-12-25 CN CNB028286510A patent/CN100347369C/zh not_active Expired - Fee Related
  • 2002-12-25 WO PCT/JP2002/013538 patent/WO2003080912A1/ja active Application Filing
  • 2002-12-25 AU AU2002360034A patent/AU2002360034A1/en not_active Abandoned
• 2003
  • 2003-01-09 TW TW092100424A patent/TWI263715B/zh not_active IP Right Cessation

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