WO2012070462A1 - Method for producing body with fused sheets, and body with fused sheets - Google Patents

Method for producing body with fused sheets, and body with fused sheets Download PDF

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Publication number
WO2012070462A1
WO2012070462A1 PCT/JP2011/076511 JP2011076511W WO2012070462A1 WO 2012070462 A1 WO2012070462 A1 WO 2012070462A1 JP 2011076511 W JP2011076511 W JP 2011076511W WO 2012070462 A1 WO2012070462 A1 WO 2012070462A1
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WO
WIPO (PCT)
Prior art keywords
sheet
fusion
sheets
fused
pressing member
Prior art date
Application number
PCT/JP2011/076511
Other languages
French (fr)
Japanese (ja)
Inventor
康至 今井
海老原　明浩
真 小久保
伸二 浜本
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.)
Filing date
Publication date
Priority claimed from JP2010260325A external-priority patent/JP2012111076A/en
Priority claimed from JP2011246780A external-priority patent/JP5912431B2/en
Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN201180055438.4A priority Critical patent/CN103221195B/en
Publication of WO2012070462A1 publication Critical patent/WO2012070462A1/en

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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
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
    • B23K26/0661—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks disposed on the workpiece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/083—Devices involving movement of the workpiece in at least one axial direction
    • B23K26/0838—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt
    • B23K26/0846—Devices involving movement of the workpiece in at least one axial direction by using an endless conveyor belt for moving elongated workpieces longitudinally, e.g. wire or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved
    • B23K26/324—Bonding taking account of the properties of the material involved involving non-metallic parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1648—Laser beams characterised by the way of heating the interface radiating the edges of the parts to be joined
    • B29C65/1651—Laser beams characterised by the way of heating the interface radiating the edges of the parts to be joined radiating the edges of holes or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1696—Laser beams making use of masks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7437—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a perforating tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/747—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using other than mechanical means
    • B29C65/7473—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using other than mechanical means using radiation, e.g. laser, for simultaneously welding and severing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B29C65/7847—Holding or clamping means for handling purposes using vacuum to hold at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7294—Non woven mats, e.g. felt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
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    • B29C66/83431—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts
    • B29C66/83433—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts the contact angle between said rollers, cylinders or drums and said bands or belts being a non-zero angle
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
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    • B29C66/83435—Roller, cylinder or drum types; Band or belt types; Ball types rollers, cylinders or drums cooperating with bands or belts said rollers, cylinders or drums being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/30—Organic material
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1619—Mid infrared radiation [MIR], e.g. by CO or CO2 lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1687—Laser beams making use of light guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/82—Testing the joint
    • B29C65/8253—Testing the joint by the use of waves or particle radiation, e.g. visual examination, scanning electron microscopy, or X-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/137—Beaded-edge joints or bead seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/48—Wearing apparel
    • B29L2031/4871—Underwear
    • B29L2031/4878—Diapers, napkins

Abstract

The present invention is a method for producing a body with fused sheets (5) whereby the body with fused sheets (5), which is formed by fusing sheets inside a sheet laminate (1), is obtained by irradiating the sheet laminate (1), which is formed by stacking multiple sheets, with a laser beam (4). A pressing member (3) having multiple through holes (3a) that are formed in a prescribed pattern is brought into contact with one surface (1a) of the sheet laminate (1). The body with fused sheets (5), in which fusion sections (51) of the sheets are formed in a pattern corresponding to the pattern formed by the through holes (3a), is obtained by irradiating, from the side of the pressing member (3), the sheet laminate (1) in the abovementioned state with the laser beam (4) at a wavelength that is absorbed by sheets (11), causing the sheets (11) to generate heat.

Description

シート融着体の製造方法及びシート融着体Manufacturing method of sheet fusion body and sheet fusion body
　本発明は、シート融着体の製造方法及び複数枚のシートが積層されて部分的に融着されているシート融着体に関する。 The present invention relates to a method for producing a sheet fusion body and a sheet fusion body in which a plurality of sheets are laminated and partially fused.
　従来、使い捨ておむつや生理用ナプキン等のサニタリー用品の製造工程においては、重ね合わせたシートどうしの接合にヒートロール装置が汎用されている。
　また、他の接合方法として、レーザー光線を用いて溶着する方法も知られている（特許文献１参照）。
　また、シートどうしの接合ではないが、特許文献２には、レーザー光に対して透過性を有する樹脂からなる第１部材と、レーザー光に対する吸収性が良い第２部材とを積層してなる積層体を、複数の貫通孔を有する押さえ部材により第１部材側から加圧しつつ、該押さえ部材側からレーザー光を照射して第１及び第２部材間を溶着する方法が記載されている。この方法においては、押さえ部材で第１部材と第２部材とを圧接させつつ、押さえ部材で押さえた箇所を溶着させることができる。 Conventionally, in the manufacturing process of sanitary goods such as disposable diapers and sanitary napkins, a heat roll device has been widely used for joining stacked sheets.
As another bonding method, a method of welding using a laser beam is also known (see Patent Document 1).
Moreover, although it is not joining of sheets, in patent document 2, the lamination | stacking formed by laminating | stacking the 1st member which consists of resin which has the transmittance | permeability with respect to a laser beam, and the 2nd member with sufficient absorptivity with respect to a laser beam. A method is described in which a body is pressurized from the first member side by a pressing member having a plurality of through holes, and laser light is irradiated from the pressing member side to weld the first and second members. In this method, the portion pressed by the pressing member can be welded while the first member and the second member are pressed against each other by the pressing member.
　また、不織布等の、加圧すると厚みが変化するシート材を積層し、それらを熱融着するには、それらを、一方又は両方がヒーター等で加熱された金属間に挟み込み、それらを十分に加圧及び加熱する熱板シールが汎用されている。
　しかし、本来、比較的厚みがあり、柔らかく又は肌触りも良い不織布であるが、熱板シールにより熱融着させると、加圧及び加熱により融着部が硬くなる。そして、この硬い融着部が、積層シートの表面に露出すると、肌触りを悪化させ、例えば、使い捨ておむつや生理用ナプキン等のサニタリー用品等の肌に触れる商品に使用した場合には、商品価値を低下させる恐れがある。
　特許文献３には、パンツ型の使い捨ておむつのサイドシール部の硬質部分が着用者の足等に当たって痛みの原因となることが多々あるという問題を、高さ寸法の相違する単位融着部群で接合することで解消する方法を提案しているが、少なくない面積の硬質部分が表面に露出しているため、使用者が硬い感触を受けることがある。 In addition, in order to laminate sheet materials that change in thickness when pressed, such as non-woven fabrics, and to heat-seal them, sandwich them between metals heated by one or both heaters, etc. A hot plate seal that pressurizes and heats is widely used.
However, although it is a nonwoven fabric that is relatively thick and soft or soft to the touch, the fused portion becomes hard due to pressurization and heating when heat-sealed by a hot plate seal. And when this hard fused part is exposed on the surface of the laminated sheet, the touch is worsened.For example, when it is used for a product that touches the skin such as sanitary goods such as disposable diapers and sanitary napkins, There is a risk of lowering.
In patent document 3, the problem that the hard part of the side seal part of the pants-type disposable diaper hits the wearer's foot and the like often causes pain, in the unit fusion part group having different height dimensions. Although the method of eliminating by joining is proposed, since the hard part of a certain area is exposed on the surface, a user may receive a hard touch.
　また、特許文献４には、上層不織布及び下層不織布を有し、両不織布によって周囲を取り囲まれた立体的な開孔が下層不織布側に突出するように形成されている表面シートが記載されている。
　しかし、この表面シートは、下層不織布側に突出部ができるため、肌触りや外観上の理由から、製品構成上、下層不織布側が目にも肌に触れない所、例えばサニタリー用品の吸収体表面などにしか使用されておらず、パンツ型おむつの外装材などの様に両面が肌に触れる可能性があるところに使用することは困難であった。 Patent Document 4 describes a surface sheet that has an upper layer nonwoven fabric and a lower layer nonwoven fabric, and is formed such that a three-dimensional opening surrounded by both nonwoven fabrics protrudes toward the lower layer nonwoven fabric side. .
However, since this surface sheet has a protruding portion on the lower nonwoven fabric side, for reasons of touch and appearance, on the structure of the product, the lower nonwoven fabric side is not in contact with the eyes, for example, on the surface of the absorbent body of sanitary goods. However, it has been difficult to use it where there is a possibility that both sides may touch the skin, such as a pants-type diaper exterior.
特開２０１０－１８８６２９号公報JP 2010-188629 A 特開２００５－２３１１４４号公報Japanese Patent Laid-Open No. 2005-231144 特開２００８－８６４９５号公報JP 2008-86495 A 特開２００６－１２９８９１号公報JP 2006-128981 A
　ところで、シートどうしの接合に際しては、その接合により得られたシート融着体を用いて得られる各種の製品の美観を向上させたり、当該製品に所望の機能を持たせたりするために、シートどうしを所定のパターンで接合する場合がある。そのような場合、美観や特定の機能の存在を消費者等に認識させる観点等から、得られたシート融着体の外観にその接合部の配置が表れている方が良い場合もある。また、シート融着体をサニタリー用品等の肌に当てて使用する製品の製造等に用いる場合には、肌触りも良いことが望まれる。 By the way, when joining sheets, in order to improve the aesthetics of various products obtained using the sheet fusion product obtained by the joining, or to give the products desired functions, the sheets are joined together. May be joined in a predetermined pattern. In such a case, in some cases, it is better that the arrangement of the joint portion appears in the appearance of the obtained sheet fusion body from the viewpoint of making the consumer recognize the aesthetic appearance or the presence of a specific function. Further, when the sheet fusion product is used for manufacturing a product that is used by applying it to the skin such as sanitary goods, it is desired that the touch is also good.
　上述した特許文献２の技術は、基本的にレーザー光の照射ムラを無くして、第１部材と第２部材とをレーザー光の照射範囲の全域において接合する技術である。また、第１部材を透過させたレーザー光で第１部材と第２部材とを両者の界面において溶着する技術であり、溶着部の配置を外観に表すという思想はない。さらに、部材同士の界面で熱を発生させ溶着するため部材の表面に押さえ部材のパターンの形成を視認することは困難で、界面においても界面内で溶融状態の部材が凝固するまで拡散するため溶着パターンの形成は困難である。 The technique of Patent Document 2 described above is a technique that basically eliminates uneven irradiation of laser light and joins the first member and the second member throughout the laser light irradiation range. Further, this is a technique of welding the first member and the second member at the interface between them with a laser beam transmitted through the first member, and there is no idea that the arrangement of the welded portion is expressed in appearance. Further, since heat is generated and welded at the interface between the members, it is difficult to visually recognize the formation of the pressing member pattern on the surface of the member, and welding is also performed at the interface until the melted member is solidified within the interface. Formation of the pattern is difficult.
　従って、本発明は、シートどうしの融着部が所定の状態に配置され、その融着部の配置が視認し易いシート融着体を製造することのできるシート融着体の製造方法に関する。 Therefore, the present invention relates to a method for manufacturing a sheet fusion body, in which the fusion parts between the sheets are arranged in a predetermined state, and a sheet fusion body in which the arrangement of the fusion parts is easily visible can be produced.
　また、本発明は、前述した従来技術が有する欠点を解消し得るシート融着体を提供することに関する。 Also, the present invention relates to providing a sheet fusion body that can eliminate the drawbacks of the above-described conventional technology.
　本発明は、複数枚のシートが重ねられたシート積層体にレーザー光を照射することにより、シート積層体内のシートどうしが融着したシート融着体を得るシート融着体の製造方法であって、前記シート積層体の一方の面に、複数の貫通孔が所定のパターンで形成された押さえ部材を当接し、その状態のシート積層体に対して、該押さえ部材側から、前記一方の面を構成するシートに吸収され該シートを発熱させる波長のレーザー光を照射することにより、シートどうしの融着部が、前記貫通孔の形成パターンに対応するパターンで形成されたシート融着体を得るシート融着体の製造方法を提供するものである（以下、第１発明というときは、この発明をいう）。 The present invention is a method for producing a sheet fusion body, which obtains a sheet fusion body in which sheets in a sheet laminate are fused by irradiating a laser beam onto a sheet lamination body in which a plurality of sheets are stacked. Then, a pressing member having a plurality of through holes formed in a predetermined pattern is brought into contact with one surface of the sheet laminate, and the one surface is brought into contact with the sheet laminate in this state from the pressing member side. By irradiating a laser beam having a wavelength which is absorbed by the constituting sheet and generates heat, a sheet fusion sheet in which the fused portions of the sheets are formed in a pattern corresponding to the formation pattern of the through holes is obtained. The present invention provides a method for producing a fused body (hereinafter referred to as the first invention when referring to the first invention).
　また、本発明は、前記のシート融着体の製造方法によりシート融着体を製造する工程を含む吸収性物品の製造方法を提供するものである（以下、第２発明というときは、この発明をいう）。 Moreover, this invention provides the manufacturing method of an absorbent article including the process of manufacturing a sheet fusion body by the manufacturing method of the said sheet fusion body (Hereafter, this invention is referred to as 2nd invention.) Say).
　本発明は、複数枚のシートが積層されて部分的に融着されているシート融着体（積層シート）であって、複数の貫通孔が形成されており、該貫通孔の内周面に、複数枚のシートが融着した融着部が形成されており、前記融着部は、積層シートの一方の面から離間した位置に形成されており、且つ前記貫通孔の開口周縁部が、該積層シートの他方の面から突出していない、シート融着体（積層シート）を提供するものである（以下、第３発明というときは、この発明をいう）。 The present invention is a sheet-fused body (laminated sheet) in which a plurality of sheets are laminated and partially fused, and a plurality of through holes are formed on the inner peripheral surface of the through holes. A fused portion in which a plurality of sheets are fused is formed, the fused portion is formed at a position spaced from one surface of the laminated sheet, and the opening peripheral edge of the through hole is The present invention provides a sheet-fused body (laminated sheet) that does not protrude from the other surface of the laminated sheet (hereinafter referred to as the third invention).
図１は、本発明（第１、第２発明）の実施に好適に用いられるレーザー式接合装置を示す図である。FIG. 1 is a diagram showing a laser-type bonding apparatus suitably used for carrying out the present invention (first and second inventions). 図２は、図１のレーザー式接合装置を用いてシート積層体に融着部を形成する様子を説明する説明図である。FIG. 2 is an explanatory view for explaining a state in which a fused portion is formed in the sheet laminate using the laser type bonding apparatus of FIG. 図３は、本発明（第１発明）により得られるシート融着体の一部を拡大して示す斜視図である。FIG. 3 is an enlarged perspective view showing a part of the sheet fusion product obtained by the present invention (first invention). 図４は、図１に示す装置の変形例を示す図である。FIG. 4 is a diagram showing a modification of the apparatus shown in FIG. 図５は、本発明（第１、第２発明）の実施に好適に用いられる第２のレーザー式接合装置を示す図である。FIG. 5 is a diagram showing a second laser-type bonding apparatus suitably used for carrying out the present invention (first and second inventions). 図６は、図５に示す装置の変形例を示す図である。FIG. 6 is a diagram showing a modification of the apparatus shown in FIG. 図７は、本発明（第１、第２発明）の方法を用いて製造されるパンツ型の使い捨ておむつを示す斜視図である。FIG. 7 is a perspective view showing a pants-type disposable diaper manufactured using the method of the present invention (first and second inventions). 図８は、本発明（第１、第２発明）の方法を用いて製造される身体加温用の発熱具の例を示す断面図である。FIG. 8 is a cross-sectional view showing an example of a heating tool for body warming manufactured using the method of the present invention (first and second inventions). 図９は、本発明（第３発明）の一実施形態であるシート融着体（積層シート）の一部を拡大して示す斜視図である。FIG. 9 is an enlarged perspective view showing a part of a sheet fusion body (laminated sheet) according to an embodiment of the present invention (third invention). 図１０は、図９のシート融着体のＸ方向に直交するＹ方向の断面図である。FIG. 10 is a cross-sectional view in the Y direction orthogonal to the X direction of the sheet fusion body in FIG. 9. 図１１は、複数枚のシートを重ねて得たシート積層体に、レーザー光を用いて、融着部を有する貫通孔を形成する様子を示す説明図である。FIG. 11 is an explanatory diagram showing a state in which a through-hole having a fused portion is formed using a laser beam in a sheet laminate obtained by stacking a plurality of sheets. 図１２は、本発明（第３発明）のシート融着体の製造に好適に用いられるレーザー式接合装置を示す図である。FIG. 12 is a view showing a laser-type bonding apparatus preferably used for manufacturing the sheet fusion product of the present invention (third invention). 図１３は、本発明（第３発明）のシート融着体の製造に好適に用いられる穿孔加工装置を示す概略図である。FIG. 13 is a schematic view showing a perforating apparatus suitably used for manufacturing the sheet fusion product of the present invention (third invention). 図１４は、図１３に示す穿孔加工装置における穿孔加工部のロール軸長方向に沿う拡大断面図である。FIG. 14 is an enlarged cross-sectional view along the roll axis length direction of the punching section in the punching apparatus shown in FIG. 図１５は、実施例１で得られたシート融着体を示す顕微鏡写真である。FIG. 15 is a photomicrograph showing the sheet fusion product obtained in Example 1.
　以下、本発明をその好ましい実施態様に基づき図面を参照しながら説明する。
　本発明（第１発明）のシート融着体の製造方法の第１実施態様においては、帯状のシート積層体１を、連続搬送しつつ、シート積層体１に、無端状の押さえ部材３を押し付け、その状態下にレーザー光を照射し、帯状のシート融着体５を連続的に形成する。詳細には、図１に示すように、帯状のシート積層体１を、搬送ロール２と無端状の押さえ部材３との間に挟んで積層方向に加圧し、その状態下のシート積層体に対してレーザー光４を照射することにより、該シート積層体１内のシートどうしが所定のパターンで融着されたシート融着体５を連続的に製造する。 Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
In the first embodiment of the method for manufacturing a sheet fusion product of the present invention (first invention), the endless pressing member 3 is pressed against the sheet laminate 1 while continuously transporting the belt-like sheet laminate 1. In this state, laser light is irradiated to continuously form the belt-shaped sheet fusion product 5. Specifically, as shown in FIG. 1, the belt-shaped sheet stack 1 is sandwiched between the transport roll 2 and the endless pressing member 3 and pressed in the stacking direction, and the sheet stack under the state is pressed. By irradiating the laser beam 4, the sheet fusion body 5 in which the sheets in the sheet laminate 1 are fused in a predetermined pattern is continuously manufactured.
　第１実施態様で用いたレーザー式接合装置１０について説明すると、レーザー式接合装置１０は、図１に示すように、矢印Ａ方向に回転駆動される搬送ロール２と、加圧ベルト３２を備えたベルト式加圧装置３１を備えている。
　ベルト式加圧装置３１は、無端状の加圧ベルト３２及び該加圧ベルト３２が架け渡された状態で回転する３本のロール３３ａ，３３ｂ，３３ｃを備えている。ベルト式加圧装置３１の加圧ベルト３２が、本実施態様における押さえ部材３である。
　加圧ベルト３２は、ロール３３ａ，３３ｂ，３３ｃの何れか１以上を回転駆動して、搬送ロール２と同速度で移動する。また、搬送ロール２及び加圧ベルト３２は、空冷、水冷等により温度を所定の温度範囲に維持することが好ましい。 The laser bonding apparatus 10 used in the first embodiment will be described. The laser bonding apparatus 10 includes a transport roll 2 that is rotationally driven in the direction of arrow A and a pressure belt 32 as shown in FIG. A belt-type pressure device 31 is provided.
The belt-type pressure device 31 includes an endless pressure belt 32 and three rolls 33a, 33b, and 33c that rotate in a state where the pressure belt 32 is bridged. The pressure belt 32 of the belt type pressure device 31 is the pressing member 3 in this embodiment.
The pressure belt 32 rotates at least one of the rolls 33a, 33b, and 33c and moves at the same speed as the transport roll 2. Moreover, it is preferable that the conveyance roll 2 and the pressure belt 32 maintain temperature in a predetermined temperature range by air cooling, water cooling, or the like.
　レーザー式接合装置１０は、加圧ベルト３２と搬送ロール２との間隔を増減調整できる間隔調整機構を有し、当該間隔の調整により、加圧ベルト３２と搬送ロール２とによって、シート積層体１に加える圧力を適宜調整することができる。 The laser-type bonding apparatus 10 includes an interval adjustment mechanism that can increase or decrease the interval between the pressure belt 32 and the conveyance roll 2, and the sheet stack 1 by the pressure belt 32 and the conveyance roll 2 by adjusting the interval. The pressure applied to can be adjusted as appropriate.
　シート積層体１は、図示しない案内ロール等によって、搬送ロール２の周面上に導入され、搬送ロール２に巻き掛けられるようにして搬送された後、図示しない導出ロール及びニップロール等によって搬送ロール２の周面から離れる。このように、シート積層体１を、搬送ロール２に巻き掛けるようにして搬送することで、シート積層体１が不織布を含む場合等に、該シート積層体１を、より効率的に圧縮させることができる。シート積層体１が、搬送ロール２の周面上に導入されてから該周面を離れるまでの搬送ロール２の回転角度は、例えば、９０～２７０度とすることができ、より好ましくは１２０～２７０度である。
　また、加圧ベルト３２によりシート積層体１を搬送ロール２の周面に圧接させる角度範囲は、搬送ロール２の周方向の全周に亘って圧接させる場合を３６０度とした場合に、１０度以上であることが好ましく、より好ましくは３０度以上である。 The sheet laminate 1 is introduced onto the peripheral surface of the transport roll 2 by a guide roll (not shown) and conveyed so as to be wound around the transport roll 2, and then the transport roll 2 by a lead roll and a nip roll (not shown). Get away from the circumference. In this way, by transporting the sheet laminate 1 so as to be wound around the transport roll 2, the sheet laminate 1 can be more efficiently compressed when the sheet laminate 1 includes a nonwoven fabric or the like. Can do. The rotation angle of the transport roll 2 from when the sheet laminate 1 is introduced onto the peripheral surface of the transport roll 2 until it leaves the peripheral surface can be, for example, 90 to 270 degrees, and more preferably 120 to 270 degrees.
In addition, the angle range in which the sheet stack 1 is pressed against the peripheral surface of the transport roll 2 by the pressure belt 32 is 10 degrees when 360 degrees is set for press contact over the entire circumference of the transport roll 2. It is preferable that it is above, more preferably 30 degrees or more.
　加圧ベルト３２には、金属又は樹脂製のメッシュベルトや、金属又は樹脂製のベルトにエッチングやパンチングにより多数の貫通孔を形成してなる開孔ベルト等が用いられる。押さえ部材３としてのメッシュベルトや開孔ベルトは、図２（ｂ）に示すように、貫通孔３ａをレーザー光４が透過する一方、貫通孔３ａ以外の部分３ｂはレーザー光４を透過させない。
　搬送ロール２は、その周面がレーザー光４の透過性を有するものであっても良いし、その周面がレーザー光４の透過性を有しないものであっても良い。 As the pressure belt 32, a mesh belt made of metal or resin, an aperture belt formed by forming a large number of through holes by etching or punching on a metal or resin belt, or the like is used. As shown in FIG. 2B, the mesh belt or the aperture belt as the pressing member 3 transmits the laser beam 4 through the through hole 3a, while the portion 3b other than the through hole 3a does not transmit the laser beam 4.
The transport roll 2 may have a peripheral surface that is transparent to the laser light 4 or may have a peripheral surface that is not transparent to the laser light 4.
　レーザー式接合装置１０を用いた本実施態様のシート融着体の製造方法においては、図２（ａ）に示すように、複数枚のシートが重ねられたシート積層体１であって、少なくとも一方の面１ａを構成するシート１１が、レーザー光４を吸収して発熱するものを用いる。
　シート１１以外のシートは、該レーザー光４に対して吸収して発熱するものであっても、該レーザー光４を透過して殆ど発熱しないものであっても良い。
　図２には、レーザー光４を吸収して発熱するシートを４枚重ねたシート積層体１が図示されている。シート積層体１を構成する複数枚のシートは、そのうちの１枚又は複数枚のシートが、搬送ロール２の周面上で他のシート上に積層されたものであっても良い。
　また、レーザー光４で融着する前のシート積層体１は、層間が全く接合されていないものであっても、融着以外の方法で部分的に接合されているものであっても良い。融着以外の方法で部分的に接合されている態様には、例えば、レーザー光で後に融着部を形成する部分とは異なる部分がホットメルト接着剤等の接着剤により接合されている態様が挙げられる。 In the method for manufacturing a sheet fusion body of the present embodiment using the laser-type bonding apparatus 10, as shown in FIG. 2 (a), a sheet laminate 1 in which a plurality of sheets are stacked, The sheet 11 that constitutes the surface 1a of the sheet 11 uses a material that absorbs the laser light 4 and generates heat.
The sheet other than the sheet 11 may absorb heat with respect to the laser light 4 and generate heat, or may transmit the laser light 4 and hardly generate heat.
FIG. 2 shows a sheet laminate 1 in which four sheets that generate heat by absorbing the laser beam 4 are stacked. The plurality of sheets constituting the sheet laminate 1 may be one in which one or a plurality of sheets are laminated on another sheet on the peripheral surface of the transport roll 2.
Further, the sheet laminate 1 before being fused by the laser beam 4 may be one in which the layers are not joined at all or may be partially joined by a method other than fusion. For example, a mode in which a portion different from a portion where a fused portion is later formed by laser light is bonded by an adhesive such as a hot melt adhesive is included in the mode in which the portion is bonded by a method other than fusion. Can be mentioned.
　レーザー光４は、図２（ｂ）に示すように、シート積層体１における、レーザー光４を吸収して発熱するシート１１からなる面１ａに押さえ部材３を当接させ、その状態のシート積層体１に対して該押さえ部材３側から照射する。
　これにより、シート積層体１を構成する複数枚のシート１１，１２，１３及び１４が融着して、図２（ｃ）及び図３に示すように、押さえ部材３の貫通孔の形成パターンに対応するパターンで融着部５１，５１・・が形成されたシート融着体５が得られる。レーザー光４は、シート積層体１を構成する総てのシート１１～１４を一体化させるように照射することが好ましい。図１中、４１は、レーザー光４を照射する照射ヘッド４１であり、押さえ部材３である加圧ベルト３２から所定の距離離間した特定の位置に固定されている。照射ヘッド４１の位置は、レーザー光４を反射するミラーを介することによりベルト式加圧装置３１の外部に設け、ミラーを加圧ベルト３２から所定の距離離間した特定の位置に固定してもよい。 As shown in FIG. 2 (b), the laser beam 4 is brought into contact with the surface 1a made of the sheet 11 that absorbs the laser beam 4 and generates heat in the sheet laminate 1, and the sheet laminate in that state. The body 1 is irradiated from the side of the pressing member 3.
Thereby, the plurality of sheets 11, 12, 13 and 14 constituting the sheet laminate 1 are fused to form a through hole formation pattern of the pressing member 3 as shown in FIGS. 2 (c) and 3. The sheet fusion body 5 in which the fusion portions 51, 51,... Are formed in a corresponding pattern is obtained. The laser beam 4 is preferably irradiated so that all the sheets 11 to 14 constituting the sheet laminate 1 are integrated. In FIG. 1, reference numeral 41 denotes an irradiation head 41 that irradiates a laser beam 4, and is fixed at a specific position spaced apart from the pressure belt 32 that is the pressing member 3 by a predetermined distance. The position of the irradiation head 41 may be provided outside the belt-type pressure device 31 through a mirror that reflects the laser light 4, and the mirror may be fixed at a specific position separated from the pressure belt 32 by a predetermined distance. .
　図４に、第１実施形態の変形例を示す。図４に示す第１実施形態の変形例においては、ベルト式加圧装置３１の加圧ベルト３２からなる押さえ部材３の、シート積層体１を加圧する面（加圧面）とは反対側に、負圧空間４２を設け、該負圧空間４２を通してレーザー光４を、押さえ部材３側からシート積層体１に照射する。
　詳細には、照射ヘッド４１’を内部に取り込み加圧ベルト３２近傍まで存するフード４３を、加圧ベルト３２に囲まれた空間内に設け、該フード４３に吸引ポンプ等の減圧装置（図示なし）を接続することで、該フード４３の内部を負圧状態とする。
　フード４３は、加圧ベルト３２側（フードの下端）が閉じられていないため、レーザー光４の照射には影響ない。押さえ部材３の加圧面とは反対側に配したフード４３内が負圧状態となることにより、加圧ベルト３２付近で吸気が発生し、加圧ベルト３２やシート積層体１を冷却したり、レーザー光４の照射により発生したガスを排気することができる。また、シート積層体１を、押さえ部材３である加圧ベルト３２に対し、更に密着させることができ、効率的な圧縮や、安定した搬送とともに、融着部の形成を一層良好とすることができる。 FIG. 4 shows a modification of the first embodiment. In the modification of the first embodiment shown in FIG. 4, the pressing member 3 formed of the pressure belt 32 of the belt-type pressure device 31 is opposite to the surface (pressure surface) that presses the sheet laminate 1. A negative pressure space 42 is provided, and laser light 4 is irradiated to the sheet laminate 1 from the side of the pressing member 3 through the negative pressure space 42.
Specifically, a hood 43 that takes in the irradiation head 41 ′ and extends to the vicinity of the pressure belt 32 is provided in a space surrounded by the pressure belt 32, and a decompression device (not shown) such as a suction pump is provided in the hood 43. Is connected to bring the inside of the hood 43 into a negative pressure state.
Since the hood 43 is not closed on the pressure belt 32 side (lower end of the hood), it does not affect the irradiation of the laser beam 4. When the inside of the hood 43 disposed on the opposite side of the pressing surface of the pressing member 3 is in a negative pressure state, intake air is generated in the vicinity of the pressing belt 32, and the pressing belt 32 and the sheet laminate 1 are cooled, The gas generated by the irradiation with the laser beam 4 can be exhausted. In addition, the sheet laminate 1 can be further adhered to the pressure belt 32 that is the pressing member 3, and the formation of the fused portion can be further improved with efficient compression and stable conveyance. it can.
　このような効果がより確実にかつ効率的奏されるようにする観点から、負圧状態とするのは、加圧ベルト３２とシート積層体１が当接した領域内であり、且つレーザーが照射される領域より大きい範囲であることが好ましい。
　なお、図４及び図６に示すレーザー式接合装置における照射ヘッド４１’は、レーザー光４の照射点を、シート積層体１の移動方向及びその直交方向に移動させながら、レーザー光４を照射することが可能であり、それにより、シート積層体１に、その流れ方向及びその直交方向に分散した多数の融着部５１を効率よく形成可能である。図４及び図６中、符号４４は、フード４３と減圧装置とを接続する配管であり、符号４３ａは、フード４３の下端近傍に設けられた排気口である。 From the viewpoint of achieving such an effect more reliably and efficiently, the negative pressure state is set in a region where the pressure belt 32 and the sheet laminate 1 are in contact with each other, and the laser is irradiated. It is preferable that the range be larger than the region to be formed.
In addition, irradiation head 41 'in the laser-type joining apparatus shown in FIG.4 and FIG.6 irradiates the laser beam 4, moving the irradiation point of the laser beam 4 to the moving direction of the sheet laminated body 1, and its orthogonal direction. Accordingly, a large number of fused portions 51 dispersed in the flow direction and the orthogonal direction can be efficiently formed in the sheet laminate 1. 4 and 6, reference numeral 44 is a pipe connecting the hood 43 and the pressure reducing device, and reference numeral 43 a is an exhaust port provided in the vicinity of the lower end of the hood 43.
　図５は、本発明の第２実施態様を示す図である。
　第２実施態様においては、図５に示すように、貫通孔を有する円筒ロール６に、帯状のシート積層体１を当接させ、該シート積層体１のもう一方の面より無端状の加圧ベルト３４で積層方向に加圧し、その状態下の該シート積層体１に対して円筒ロール６の内側よりレーザー光４を照射することにより、該シート積層体１のシートどうしが所定のパターンで融着されたシート融着体５を連続的に製造する。円筒ロール６が、第２実施態様における押さえ部材（円筒状の押さえ部材）３である。 FIG. 5 is a diagram showing a second embodiment of the present invention.
In the second embodiment, as shown in FIG. 5, the belt-shaped sheet laminate 1 is brought into contact with the cylindrical roll 6 having a through hole, and the endless pressurization from the other surface of the sheet laminate 1 is performed. The belt 34 is pressed in the laminating direction, and the sheet laminate 1 under the state is irradiated with the laser beam 4 from the inside of the cylindrical roll 6 so that the sheets of the sheet laminate 1 are melted in a predetermined pattern. The attached sheet fusion body 5 is continuously manufactured. The cylindrical roll 6 is the pressing member (cylindrical pressing member) 3 in the second embodiment.
　第２実施態様を用いたレーザー式接合装置１０Ａについて説明すると、レーザー式接合装置１０Ａは、図５に示すように、矢印Ａ方向に回転駆動される、貫通孔を有する円筒ロール６と、加圧ベルト３４を備えたベルト式加圧装置３１Ａを備えている。
　ベルト式加圧装置３１Ａは、無端状の加圧ベルト３４及び該加圧ベルト３４が架け渡された状態で回転する３本のロール３３ａ，３３ｂ，３３ｃを備えている。
　加圧ベルト３４は、ロール３３ａ，３３ｂ，３３ｃの何れか１以上を回転駆動して、円筒ロール６と同速度で移動する。また、円筒ロール６及び加圧ベルト３４は、空冷、水冷等により温度を所定の温度範囲に維持することが好ましい。 The laser-type bonding apparatus 10A using the second embodiment will be described. The laser-type bonding apparatus 10A includes a cylindrical roll 6 having a through-hole that is driven to rotate in the direction of arrow A, as shown in FIG. A belt-type pressurizing device 31 </ b> A including a belt 34 is provided.
The belt-type pressure device 31A includes an endless pressure belt 34 and three rolls 33a, 33b, and 33c that rotate while the pressure belt 34 is bridged.
The pressure belt 34 rotates at least one of the rolls 33 a, 33 b, and 33 c and moves at the same speed as the cylindrical roll 6. The cylindrical roll 6 and the pressure belt 34 are preferably maintained in a predetermined temperature range by air cooling, water cooling, or the like.
　レーザー式接合装置１０Ａは、加圧ベルト３４と円筒ロール６との間隔を増減調整できる間隔調整機構を有し、当該間隔の調整により、加圧ベルト３４と円筒ロール６とによって、シート積層体１に加える圧力を適宜調整することができる。 The laser-type bonding apparatus 10 </ b> A has an interval adjustment mechanism that can increase or decrease the interval between the pressure belt 34 and the cylindrical roll 6, and the sheet laminate 1 can be adjusted by the pressure belt 34 and the cylindrical roll 6 by adjusting the interval. The pressure applied to can be adjusted as appropriate.
　シート積層体１は、図示しない案内ロール等によって、円筒ロール６の周面上に導入され、円筒ロール６に巻き掛けられるようにして搬送された後、図示しない導出ロール及びニップロール等によって円筒ロール６の周面から離れる。このように、シート積層体１を、円筒ロール６に巻き掛けるようにして搬送することで、シート積層体１が不織布を含む場合等に、該シート積層体１を、より効率的に圧縮させることができる。シート積層体１が、円筒ロール６の周面上に導入されてから該周面を離れるまでの円筒ロール６の回転角度は、例えば、９０～２７０度とすることができ、より好ましくは１２０～２７０度である。
　また、加圧ベルト３４によりシート積層体１を円筒ロール６の周面に圧接させる角度範囲は、円筒ロール６の周方向の全周に亘って圧接させる場合を３６０度とした場合に、１０度以上であることが好ましく、より好ましくは３０度以上である。 The sheet laminate 1 is introduced onto the circumferential surface of the cylindrical roll 6 by a guide roll (not shown) and conveyed so as to be wound around the cylindrical roll 6, and then the cylindrical roll 6 is drawn by a lead roll and a nip roll (not shown). Get away from the circumference. In this way, by transporting the sheet laminate 1 so as to be wound around the cylindrical roll 6, the sheet laminate 1 can be more efficiently compressed when the sheet laminate 1 includes a nonwoven fabric or the like. Can do. The rotation angle of the cylindrical roll 6 from when the sheet laminate 1 is introduced onto the circumferential surface of the cylindrical roll 6 to the separation from the circumferential surface can be, for example, 90 to 270 degrees, and more preferably 120 to 270 degrees.
In addition, the angle range in which the sheet laminate 1 is pressed against the circumferential surface of the cylindrical roll 6 by the pressure belt 34 is 10 degrees when 360 degrees is pressed over the entire circumference of the cylindrical roll 6. It is preferable that it is above, more preferably 30 degrees or more.
　加圧ベルト３４には、加工時に発生する熱に耐えうる耐熱性を有する金属又は樹脂製のベルトが用いられ、レーザー光４の透過性を有するものであっても良いし、有しないものであっても良い。 As the pressure belt 34, a heat-resistant metal or resin belt that can withstand the heat generated during processing is used, which may or may not have laser beam 4 transparency. May be.
　円筒ロール６は、鉄やアルミニウム、ステンレス鋼などの金属材からなり、その周面の一部または全面にエッチングやパンチング、またはレーザー加工等で穴あけされた貫通孔が配置されている。また、円筒ロール６は、枠体に、金属又は樹脂製のメッシュベルトや、金属又は樹脂製のベルトにエッチングやパンチングにより多数の貫通孔を形成してなる開孔ベルトを巻き付けてロール状としたものでもよい。円筒ロール６（円筒状の押さえ部材）に設ける貫通孔の配置と形状は特に限定されるものではなく、レーザーの仕様や加工部材の物性等を考慮して決定されれば良い。また、配置された貫通孔ではレーザー光を透過する一方、貫通孔以外の部分はレーザー光を透過させない。図４に示す円筒ロール６は、周方向における複数の位置（より具体的には４等配の位置）に、貫通孔６ａが比較的高密度に配置された領域を有している。 The cylindrical roll 6 is made of a metal material such as iron, aluminum, and stainless steel, and a through-hole that is drilled by etching, punching, laser processing, or the like is disposed on a part or the whole of the peripheral surface. The cylindrical roll 6 is rolled into a frame by winding a metal or resin mesh belt or an opening belt formed by forming a large number of through holes on a metal or resin belt by etching or punching. It may be a thing. The arrangement and shape of the through holes provided in the cylindrical roll 6 (cylindrical pressing member) are not particularly limited, and may be determined in consideration of laser specifications, physical properties of the processed member, and the like. Further, the laser beam is transmitted through the arranged through holes, while the portions other than the through holes do not transmit the laser light. The cylindrical roll 6 shown in FIG. 4 has a region where the through holes 6a are arranged at a relatively high density at a plurality of positions in the circumferential direction (more specifically, four equally spaced positions).
　図６に、第２実施形態の変形例を示す。図６に示す第２実施形態の変形例においては、円筒ロール６からなる押さえ部材３の、シート積層体１を加圧する面（加圧面）とは反対側に、負圧空間４２を設け、該負圧空間４２を通してレーザー光４を、押さえ部材３側からシート積層体１に照射する。
　詳細には、照射ヘッド４１’を内部に取り込み円筒ロール６の内周面近傍まで存するフード４３を、円筒ロール６内に設け、該フード４３に吸引ポンプ等の減圧装置（図示なし）を接続することで、該フード４３の内部を負圧状態とする。
　フード４３は、円筒ロール６の内周面に近接する側（フードの下端）が閉じられていないため、レーザー光４の照射には影響ない。押さえ部材３の加圧面とは反対側に配したフード４３内が負圧状態となることにより、円筒ロール６の内周面付近で吸気が発生し、円筒ロール６やシート積層体１を冷却したり、レーザー光４の照射により発生したガスを排気することができる。また、シート積層体１を、押さえ部材３である円筒ロール６に対し、更に密着させることができ、効率的な圧縮や、安定した搬送とともに、融着部の形成を一層良好とすることができる。 FIG. 6 shows a modification of the second embodiment. In the modification of 2nd Embodiment shown in FIG. 6, the negative pressure space 42 is provided in the other side of the pressing member 3 which consists of cylindrical rolls 6 to the surface (pressurization surface) which presses the sheet | seat laminated body 1, The laser beam 4 is irradiated to the sheet laminate 1 from the holding member 3 side through the negative pressure space 42.
Specifically, a hood 43 that takes in the irradiation head 41 ′ and extends to the vicinity of the inner peripheral surface of the cylindrical roll 6 is provided in the cylindrical roll 6, and a decompression device (not shown) such as a suction pump is connected to the hood 43. Thus, the inside of the hood 43 is brought into a negative pressure state.
Since the hood 43 is not closed on the side close to the inner peripheral surface of the cylindrical roll 6 (the lower end of the hood), the irradiation with the laser beam 4 is not affected. When the inside of the hood 43 disposed on the side opposite to the pressing surface of the pressing member 3 is in a negative pressure state, intake air is generated near the inner peripheral surface of the cylindrical roll 6 to cool the cylindrical roll 6 and the sheet laminate 1. Or the gas generated by the irradiation of the laser beam 4 can be exhausted. Further, the sheet laminate 1 can be further adhered to the cylindrical roll 6 that is the pressing member 3, and the formation of the fused portion can be further improved along with efficient compression and stable conveyance. .
　このような効果がより確実にかつ効率的に奏されるようにする観点から、負圧状態とするのは、円筒ロール６とシート積層体１が当接した領域内であり、且つレーザーが照射される領域より大きい範囲であることが好ましい。 From the viewpoint of ensuring such an effect more reliably and efficiently, the negative pressure state is in the region where the cylindrical roll 6 and the sheet laminate 1 are in contact with each other, and the laser is irradiated. It is preferable that the range be larger than the region to be formed.
　上記の両実施態様のシート融着体の製造方法（前述したそれぞれの変形例を含む）によれば、シート積層体１の一方の面１ａを、レーザー光４を吸収して発熱するシート１１から構成し、該シート１１側からレーザー光４を照射するため、得られたシート融着体５に、シート１１と他のシートとが融着した融着部５１が明瞭に表れる。
　また、押さえ部材３の貫通孔の形成パターンに対応するパターンで融着部５１，５１・・が形成されるため、貫通孔３ａの形成パターンや貫通孔３ａが平面方向に分布する押さえ部材３に対してどのような範囲にレーザー光４を照射するか等を適宜にコントロールすることで、融着部５１が様々なパターンに配置したシート融着体５を得ることができる。
　融着部５１を、外観に明瞭に表われるように、且つ貫通孔３ａの形成パターンに対応するパターンで形成することにより、シート融着体５やそれを用いた製品の美観を向上させたり、あるいは、シート融着体５やそれを用いた製品に特定の機能が存在することを消費者等にアピールできたりするメリットがある。但し、メリットは、それらに限られるものではない。 According to the method for manufacturing the sheet fusion body of both the above embodiments (including the respective modifications described above), the one surface 1a of the sheet laminate 1 is absorbed from the laser beam 4 to generate heat. Since the laser beam 4 is irradiated from the sheet 11 side, the fused portion 51 where the sheet 11 and another sheet are fused clearly appears on the obtained sheet fused body 5.
Moreover, since the fusion | melting part 51,51 ... is formed in the pattern corresponding to the formation pattern of the through-hole of the pressing member 3, the formation pattern of the through-hole 3a and the pressing member 3 in which the through-hole 3a is distributed in a plane direction On the other hand, the sheet fusion body 5 in which the fused portions 51 are arranged in various patterns can be obtained by appropriately controlling the range in which the laser beam 4 is irradiated.
By forming the fused portion 51 in a pattern corresponding to the formation pattern of the through-holes 3a so as to be clearly shown in the appearance, the aesthetics of the sheet fused body 5 and a product using the same can be improved, Or there exists a merit which can appeal to consumers etc. that a specific function exists in the sheet | seat fused | fusion body 5 or a product using the same. However, the merit is not limited to them.
　図３に示すシート融着体５は、平面視矩形状の貫通孔が、ＭＤ方向及びＣＤ方向の両方向にそれぞれ多列に形成されたメッシュベルトや開孔ベルトを押さえ部材３として用い、レーザー光４を、ＭＤ方向に直列した貫通孔の１列分の幅で照射して得たものである。そのため、シート融着体５の一方向（ＭＤ）に、融着部５１が一列のみ形成されているが、レーザー光４を照射する幅を、ＭＤ方向に直列した貫通孔列の２列分の幅や３列分の幅、あるいはそれ以上の幅とし、ＭＤ方向に延びる融着部５１が複数列形成されたシート融着体５を得ることもできる。また、貫通孔が千鳥状に配置された開孔ベルトを用いて、融着部５１が千鳥状に複数列形成されたシート融着体５を得ることもできる。また、隣接する融着部５１間は、シートどうし間が全く結合されていない非融着部とすることもできるし、シートどうし間が融着部５１に比べて弱く融着した弱融着部とすることもできる。 The sheet fusion body 5 shown in FIG. 3 uses a mesh belt or an aperture belt in which through holes having a rectangular shape in plan view are formed in multiple rows in both the MD direction and the CD direction as the pressing member 3, and laser light 4 was irradiated with a width corresponding to one row of through holes in series in the MD direction. For this reason, only one row of the fused portions 51 is formed in one direction (MD) of the sheet fusion body 5, but the width of the laser beam 4 is set to two rows of through-hole rows in series in the MD direction. It is also possible to obtain a sheet fusion body 5 having a width, a width corresponding to three rows, or a width larger than that, and a plurality of rows of fusion portions 51 extending in the MD direction. Moreover, the sheet | seat melt | fusion body 5 in which the melt | fusion part 51 was formed in multiple rows | lines in the zigzag form can also be obtained using the aperture belt by which the through-hole is arrange | positioned in a zigzag form. The adjacent fused portions 51 may be non-fused portions in which the sheets are not joined at all, or the weakly fused portions in which the sheets are weakly fused as compared to the fused portions 51. It can also be.
　また、押さえ部材３の貫通孔に対応した配置の融着部５１が形成されるようにする観点から、押さえ部材３の個々の貫通孔３ａは、ＭＤ及びＣＤ方向の寸法が、それぞれ２０ｍｍ以下であることが好ましく、５ｍｍ以下であることが一層好ましい。また、押さえ部材３の開口率は、４０～９０％であることが好ましく、より好ましくは６０～８０％である。 Further, from the viewpoint of forming the fusion part 51 arranged corresponding to the through hole of the pressing member 3, each of the through holes 3a of the pressing member 3 has a dimension in the MD and CD directions of 20 mm or less, respectively. It is preferable that it is 5 mm or less. The opening ratio of the pressing member 3 is preferably 40 to 90%, more preferably 60 to 80%.
　レーザー光４の照射は、押さえ部材３で加圧した状態のシート積層体１に対して行うことが、シートどうしを確実に融着させる観点から好ましい。
　また、レーザー光４の照射を、図２（ｂ）に示すように、押さえ部材３で加圧して厚み方向に圧縮させた状態のシート積層体１に対して行い、レーザー光の照射後に、押さえ部材３による加圧を解除することも好ましい。シート積層体１が圧縮回復性を有する場合、圧縮状態でレーザー光４の照射を行った後、圧縮状態から解放することで、図２（ｂ）や図３に示すように、シートどうしの融着部５１が凹部となったシート融着体５を得ることができる。他の部分に比して硬くなり易い融着部５１が凹部となっていることにより、そのシート融着体５を、サニタリー用品等の肌に当てて使用する製品の肌に当たる面等に使用する場合等における肌触り等が向上する。シート融着体５において、面５ａは、シート積層体１におけるレーザー光が照射された側の面１ａであり、面５ｂは、その反対側の面である。 The irradiation of the laser beam 4 is preferably performed on the sheet laminate 1 in a state of being pressed by the pressing member 3 from the viewpoint of reliably fusing the sheets together.
Further, as shown in FIG. 2B, the laser beam 4 is irradiated to the sheet laminate 1 in a state of being pressed by the pressing member 3 and compressed in the thickness direction. It is also preferable to release the pressure applied by the member 3. When the sheet laminate 1 has a compression recovery property, after the laser beam 4 is irradiated in the compressed state, the sheet laminate 1 is released from the compressed state, so that the sheets can be melted as shown in FIG. The sheet fusion body 5 in which the attaching part 51 becomes a recessed part can be obtained. Since the fused part 51 that is harder than other parts is a concave part, the sheet fused body 5 is used on the surface of the product that is applied to the skin of a sanitary product or the like. The touch etc. in the case etc. improve. In the sheet fusion body 5, the surface 5 a is the surface 1 a on the side of the sheet laminate 1 irradiated with the laser light, and the surface 5 b is the opposite surface.
　レーザー光４の照射する際のシート積層体１の厚みＴ２は、押さえ部材３によって圧縮される前のシートの積層体１の厚みＴ１に対して、１０～５０％とすることが好ましく、より好ましくは２０～３０％である。
　また、得られたシート融着体５は、融着部５１における厚みＴ３が、融着部５１以外の部分の厚みＴ４に対して、１０～５０％であることが好ましく、より好ましくは２０～３０％である。
　ここで、Ｔ１，Ｔ３及びＴ４の厚みは、無加重の状態で断面を光学顕微鏡で撮影しスケールを用いて測定した。また、Т２の厚みは、押さえ部材の厚みを予め測定し、シート積層体を載せている支持体（台等）の表面の高さを基準として、シート積層体を加圧している押さえ部材上をレーザー変位計で変位測定し、その測定した相対値から押さえ部材の厚みを引いて求めた。 The thickness T2 of the sheet laminate 1 when irradiated with the laser beam 4 is preferably 10 to 50%, more preferably, the thickness T1 of the sheet laminate 1 before being compressed by the pressing member 3. Is 20-30%.
Further, in the obtained sheet fusion product 5, the thickness T 3 in the fusion part 51 is preferably 10 to 50%, more preferably 20 to 20% with respect to the thickness T 4 of the part other than the fusion part 51. 30%.
Here, the thicknesses of T1, T3, and T4 were measured using a scale obtained by photographing a cross section with an optical microscope in an unweighted state. In addition, the thickness of Т2 is determined by measuring the thickness of the pressing member in advance and measuring the pressure on the pressing member that pressurizes the sheet stack based on the height of the surface of the support (such as a table) on which the sheet stack is placed. The displacement was measured with a laser displacement meter, and the thickness of the pressing member was subtracted from the measured relative value.
　シート積層体１に照射するレーザー光が、該シート積層体を構成する個々のシートについて、該シートに吸収されて該シートを発熱させる波長であるか否かは、シートの材質と、使用するレーザー光の波長との関係で決まる。 Whether or not the laser beam applied to the sheet laminate 1 is a wavelength that is absorbed by the sheet and generates heat for the individual sheets constituting the sheet laminate is determined by the material of the sheet and the laser used. It depends on the relationship with the wavelength of light.
　シート積層体１が、使い捨ておむつや生理用ナプキン等のサニタリー用品の製造に汎用される合成樹脂製の不織布やフィルムの積層体である場合、レーザーとしては、ＣＯ2レーザー、ＹＡＧレーザー、ＬＤレーザー（半導体レーザー）、ＹＶＯ4レーザー、ファイバーレーザー等を用いることが好ましい。また、シートが、合成樹脂として、ポリエチレン、ポリエチレンテレフタレート、ポリプロピレン等を含む場合、該シートに吸収され該シートを良好に発熱させ得る波長としては、例えば、８．０～１５μｍを用いることが好ましく、大容量のレーザー装置が存在するＣＯ２レーザーの発振波長の１０．６μｍを用いることが特に好ましい。例えば、ＣＯ２レーザーの照射条件として、芯部がポリエチレンテレフタレートで鞘部がポリエチレンである芯鞘型複合繊維のスパンボンド不織布とエアスルー不織布をそれぞれ３枚ずつ積層し計６枚の不織布で構成する静止状態の積層体のシート融着体を製造する場合、スポット径３．５ｍｍ以下、レーザー出力２１Ｗ以上、走査速度２１０ｍｍ／ｓ以下が好ましい。これらの照射条件は、積層体を構成する材料の物性や積層体の構成、加圧状態、搬送速度によって変化するのでこの限りではない。 When the sheet laminate 1 is a laminate of non-woven fabric or film made of synthetic resin that is widely used in the manufacture of sanitary products such as disposable diapers and sanitary napkins, the laser may be a CO 2 laser, YAG laser, LD laser ( (Semiconductor laser), YVO4 laser, fiber laser or the like is preferably used. Further, when the sheet contains polyethylene, polyethylene terephthalate, polypropylene, or the like as a synthetic resin, it is preferable to use, for example, 8.0 to 15 μm as a wavelength that can be absorbed by the sheet and heat the sheet satisfactorily. It is particularly preferable to use 10.6 μm of the oscillation wavelength of a CO 2 laser in which a large-capacity laser device exists. For example, as a CO2 laser irradiation condition, a stationary state in which a core-sheath composite fiber having a core part of polyethylene terephthalate and a sheath part of polyethylene is laminated with three spunbond nonwoven fabrics and three air-through nonwoven fabrics, and a total of six nonwoven fabrics. In the case of manufacturing a sheet fusion product of the laminate, a spot diameter of 3.5 mm or less, a laser output of 21 W or more, and a scanning speed of 210 mm / s or less are preferable. These irradiation conditions are not limited to this because they change depending on the physical properties of the material constituting the laminate, the configuration of the laminate, the pressurization state, and the conveyance speed.
　本発明で製造されるシート融着体は、そのまま、あるいは他の部材と一体化されて各種の物品として用いることができる。各種の物品としては、例えば、使い捨ておむつや生理用ナプキン、失禁パッド等の吸収性物品や、床面清掃用のシート、身体清拭用のシート等が挙げられる。
　例えば、吸収性物品を構成するシート融着体としては、使い捨ておむつや生理用ナプキンの肌当接面を形成する表面シートと非肌当接面を形成する裏面シートとが、吸収体の周縁部より延出した部分で接合されているものや、ウイング部付きの生理用ナプキンにおける、表面シートとウイング部形成用シート、ウイング部形成用シートと裏面シート、表面シートとウイング部形成用シートと裏面シート、が融着したもの等が挙げられる。 The sheet fusion product produced in the present invention can be used as various articles as it is or integrated with other members. Examples of various articles include absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads, floor cleaning sheets, body wiping sheets, and the like.
For example, as the sheet fusion body constituting the absorbent article, the peripheral sheet of the absorbent body includes a surface sheet that forms a skin contact surface of a disposable diaper or a sanitary napkin and a back sheet that forms a non-skin contact surface. In a sanitary napkin with a wing part joined by a more extended part, a top sheet and a wing part forming sheet, a wing part forming sheet and a back sheet, a top sheet and a wing part forming sheet and a back surface Examples include a sheet fused.
　シート積層体に含まれて互いに融着されるシートとしては、各種製法による不織布、樹脂フィルム、不織布化されていない繊維ウエブ等が挙げられる。また、厚み方向に隣接する２枚のシートの一方又は双方は、熱可塑性樹脂からなる繊維を含むことが好ましい。熱可塑性樹脂としては、例えば、ポリプロピレン等のポリオレフィン、ポリエチレンテレフタレート等のポリエステル、ポリアミド等が挙げられ、これらの２以上の樹脂からなる複合繊維等を用いることもできる。 Examples of the sheet contained in the sheet laminate and fused together include non-woven fabrics, resin films, fiber webs that have not been made non-woven fabrics, and the like by various manufacturing methods. Moreover, it is preferable that one or both of the two sheets adjacent in the thickness direction include fibers made of a thermoplastic resin. Examples of the thermoplastic resin include polyolefin such as polypropylene, polyester such as polyethylene terephthalate, polyamide, and the like, and composite fibers composed of these two or more resins can also be used.
　圧縮回復性を有するシート積層体は、複数枚のシートの少なくとも一枚が圧縮回復性を有するシートであることが好ましい。圧縮回復性を有するシートとしては、繊維間に空隙を有する繊維集合体シートやウレタンフォームシート等が挙げられる。繊維間に空隙を有する繊維集合体シートとしては、各種製法による不織布や、不織布化されていない繊維ウエブ（カード機を用いて形成したウエブ等）等が挙げられる。特に、カード法又はエアレイド法により製造したウエブに、エアースルー方式の熱風処理を施し繊維の交点を融着させたエアスルー不織布や、ニードルパンチ不織布等は、圧縮回復性に富む観点から好ましい。 The sheet laminate having compression recovery property is preferably a sheet in which at least one of the plurality of sheets has compression recovery property. Examples of the sheet having compression recoverability include a fiber assembly sheet having a space between fibers and a urethane foam sheet. Examples of the fiber assembly sheet having voids between fibers include non-woven fabrics produced by various production methods, non-woven fabric fiber webs (such as webs formed using a card machine), and the like. In particular, an air-through nonwoven fabric, a needle punch nonwoven fabric, or the like in which a web manufactured by a card method or an airlaid method is subjected to an air-through hot air treatment to fuse the intersections of fibers is preferable from the viewpoint of high compression recovery.
　本発明のシート融着体の製造方法によりシート融着体を製造する工程を、吸収性物品の製造方法に具備することが好ましい。特に、図７に示すように、吸収性物品が、パンツ型の使い捨ておむつ７であり、シート融着体を製造する工程を、パンツ型の外装体７１を構成するシート部材７１Ａを幅方向に折り畳み、サイドシール部７２，７２を形成してシート融着体とする際に用いるのが好ましい。この工程を有することにより、その配置が視認し易く、また、やわらかい感触であるサイドシール部７２，７２を効率的に製造することができる。
　なお、図７に示す使い捨ておむつ７は、吸収体を含む吸収性本体７３と、該吸収性本体７３の非肌当接面側に位置して該吸収性本体７３を固定しているパンツ型の外装体７１とを有しており、外装体７１を構成するシート部材を２つ折りして該シート部材が２重に重なった部分に対して、押さえ部材で押さえつつレーザー光を照射することにより、多数の熱融着部（図示せず）が形成されたサイドシール部７２，７２を形成してある。 It is preferable that the method for producing an absorbent article includes the step of producing a sheet fusion product by the method for producing a sheet fusion product of the present invention. In particular, as shown in FIG. 7, the absorbent article is a pants-type disposable diaper 7, and the process of manufacturing the sheet fusion body is performed by folding the sheet member 71 </ b> A constituting the pants-type exterior body 71 in the width direction. The side seal portions 72, 72 are preferably used for forming a sheet fusion body. By including this step, the side seal portions 72 and 72 that are easy to visually recognize and have a soft feel can be efficiently manufactured.
The disposable diaper 7 shown in FIG. 7 has an absorbent main body 73 including an absorbent body, and a pants-type that is positioned on the non-skin contact surface side of the absorbent main body 73 and fixes the absorbent main body 73. By wrapping the sheet member constituting the exterior body 71 in half and irradiating the laser beam while pressing it with a pressing member against the portion where the sheet member overlaps, Side seal portions 72 and 72 having a large number of heat-sealed portions (not shown) are formed.
　また、やわらかい感触である融着部であることから、吸収性物品が生理用ナプキンであり、シート融着体を製造する工程を、吸収体を介在させた表面シートと裏面シートとを生理用ナプキンの外周に沿って接合する外周シール部形成に用いてもよい。また、シート融着体を製造する工程を、吸収体を介在させた表面シートと裏面シートとを、ウイング付きの生理用ナプキンにおける本体部分（ウイングを除く部分）の外周に沿って接合する外周シール部形成に用いてもよい。 In addition, since the absorbent article is a sanitary napkin because it is a fused part that has a soft feel, the process of manufacturing the sheet fusion product is performed by combining the top sheet and the back sheet with the absorbent interposed therebetween. You may use for the outer periphery seal | sticker part formation joined along the outer periphery. Moreover, the outer periphery seal | sticker which joins the process which manufactures a sheet | seat fuselage | bonding along the outer periphery of the main-body part (part except a wing) in the sanitary napkin with a wing for the surface sheet and back sheet which interposed the absorber. You may use for part formation.
　また、本発明のシート融着体の製造方法によりシート融着体を製造する工程を、身体加温用の発熱具の製造方法に具備させてもよい。身体加温用の発熱具は、例えば、図８に示す発熱具８のように、発熱部８１を、肌に当接させる面となる表面材８２と非肌当接面となる裏面材８３との間に配し、発熱部８１の周囲において表面材８２と裏面材８３との間を接合してなる。また、図８に示す発熱具８は、目元加温用に用いられる発熱具であり、装着用の耳掛けシート８４，８４を更に有する。耳掛けシート８４は、例えば、その一部分８４ａを、表面材８２又は裏面材８３に重ねて接合したり、その一部分８４ａを、表面材８２と裏面材８３との間に介在させて、それらと接合させて一体化させる。耳掛けシート８４には、耳に引っ掛けるための孔やスリット８４ａが形成されている。
　このような発熱具における、表面材と裏面材との接合や、耳掛けシートの接合に、シート融着体を製造する工程を用いることが好ましい。 Moreover, you may equip the manufacturing method of the heating tool for body heating with the process of manufacturing a sheet fusion body by the manufacturing method of the sheet fusion body of this invention. As for the heating tool for body warming, for example, like the heating tool 8 shown in FIG. 8, the heating material 81 has a surface material 82 that is a surface that makes contact with the skin and a back material 83 that becomes a non-skin contact surface. The surface material 82 and the back surface material 83 are joined around the heat generating portion 81. Moreover, the heating tool 8 shown in FIG. 8 is a heating tool used for eye heating, and further includes ear- hook sheets 84 and 84 for wearing. The ear hanging sheet 84 is, for example, partly bonded to the front surface material 82 or the back surface material 83, or a portion 84a interposed between the front surface material 82 and the back surface material 83, and bonded to them. Let them be integrated. The ear hooking sheet 84 is formed with holes and slits 84a for hooking on the ears.
In such a heating tool, it is preferable to use a process of manufacturing a sheet fusion body for joining the front surface material and the back surface material or joining the ear hook sheet.
　本発明（第３発明）の一実施形態であるシート融着体（積層シート）１０５は、図１０に示すように、複数枚のシート１１１～１１６が積層されて部分的に融着されてなる多層構造のシートである。
　シート融着体１０５には、図９に示すように、複数の貫通孔１５１，１５１・・が形成されている。複数の貫通孔１５１，１５１・・は、シート融着体１０５の平面方向（面１０５ａ，１０５ｂと平行な方向）の一方向（Ｘ方向）に、所定の間隔で直列している。 A sheet fusion body (laminated sheet) 105 according to an embodiment of the present invention (third invention) is formed by laminating a plurality of sheets 111 to 116 and partially fusing them as shown in FIG. It is a multilayer structure sheet.
As shown in FIG. 9, a plurality of through holes 151, 151... Are formed in the sheet fusion body 105. The plurality of through- holes 151, 151,... Are arranged in series at a predetermined interval in one direction (X direction) of the sheet fusion body 105 in the planar direction (direction parallel to the surfaces 105a and 105b).
　図９には、Ｘ方向に直列した３以上の貫通孔１５１からなる貫通孔列Ｒが１本のみ示されているが、本発明のシート融着体は、そのような貫通孔列Ｒを、当該貫通孔列が延びる方向（Ｘ方向）と直交する方向（Ｙ方向）に、一列のみ形成されていても良いし、複数列形成されていても良い。複数列形成されている場合、隣り合う列どうしで、Ｘ方向における貫通孔１５１の位置が一致していても良いし、ずれていても良い。例えば、半ピッチ分ずれていても良い。 FIG. 9 shows only one through-hole row R composed of three or more through-holes 151 in series in the X direction, but the sheet fusion body of the present invention has such a through-hole row R, Only one row may be formed in the direction (Y direction) orthogonal to the direction (X direction) in which the through-hole row extends, or a plurality of rows may be formed. When a plurality of rows are formed, the positions of the through holes 151 in the X direction may be the same or may be shifted between adjacent rows. For example, it may be shifted by a half pitch.
　本実施形態のシート融着体１０５は、両面１０５ａ，１０５ｂとも平坦であり、貫通孔１５１の開口部付近と貫通孔列Ｒ内の隣り合う貫通孔１５１間の領域が、両面１０５ａ，１０５ｂから窪んでいる。
　また、本実施形態のシート融着体１０５は、何れの面１０５ａ，１０５ｂについても、貫通孔１５１の開口周縁部が、該面１０５ａ，１０５ｂから突出していない。本実施形態のシート融着体１０５の一方の面１０５ａについての、貫通孔１５１の開口周縁部は、概ね、シート融着体１０５の平面方向（厚み方向に直交する方向）における、該貫通孔１５１の内周面と該面１０５ａの平坦な部分との間の部分であり、シート融着体１０５の他方の面１０５ｂについての、貫通孔１５１の開口周縁部は、概ね、シート融着体１０５の平面方向における、該貫通孔１５１の内周面と該面１０５ｂの平坦な部分との間の部分である。 The sheet fusion body 105 of the present embodiment is flat on both surfaces 105a and 105b, and the region between the opening of the through hole 151 and the adjacent through hole 151 in the through hole row R is recessed from the both surfaces 105a and 105b. It is.
Further, in the sheet fusion body 105 of the present embodiment, the opening peripheral edge portion of the through hole 151 does not protrude from the surfaces 105a and 105b for any of the surfaces 105a and 105b. The opening peripheral edge portion of the through hole 151 with respect to the one surface 105a of the sheet fusion body 105 of the present embodiment is generally the through hole 151 in the plane direction (direction perpendicular to the thickness direction) of the sheet fusion body 105. The peripheral edge of the through hole 151 with respect to the other surface 105b of the sheet fusion body 105 is generally between the inner circumferential surface of the sheet fusion body 105 and the flat portion of the surface 105a. This is a portion between the inner peripheral surface of the through-hole 151 and the flat portion of the surface 105b in the planar direction.
　シート融着体１０５における貫通孔１５１は、図１０に示すように、シート融着体１０５を厚み方向（Ｚ方向）に貫通しており、該貫通孔１５１の内周面に、複数枚のシート１１１～１１６が融着した融着部１５２が形成されている。融着部１５２は、貫通孔１５１の周囲を取り囲んでおり、貫通孔１５１の内周面の全周に亘って形成されている。融着部１５２は、複数枚のシート１１１～１１６が結合した状態となっていれば良く、完全な円筒状をなしている必要はない。 As shown in FIG. 10, the through-hole 151 in the sheet fusion body 105 penetrates the sheet fusion body 105 in the thickness direction (Z direction), and a plurality of sheets are formed on the inner peripheral surface of the through-hole 151. A fused portion 152 is formed by fusing 111 to 116. The fused portion 152 surrounds the periphery of the through hole 151 and is formed over the entire circumference of the inner peripheral surface of the through hole 151. The fused portion 152 only needs to be in a state in which a plurality of sheets 111 to 116 are joined, and does not need to have a complete cylindrical shape.
　本実施形態における融着部１５２は、シート融着体１０５を構成するシート１１１～１１６の全てが、溶融した後、固化して形成されている。融着部１５２は、貫通孔１５１の内周面に位置する複数枚のシート１１１～１１６のうちの１以上のシートが溶融固化して形成されていることが好ましく、２以上のシートが溶融固化して形成されていることがより好ましく、全てのシートが溶融固化して形成されていることが更に好ましい。 In the present embodiment, the fused portion 152 is formed by solidifying after all the sheets 111 to 116 constituting the sheet fused body 105 are melted. The fused portion 152 is preferably formed by melting and solidifying one or more of the plurality of sheets 111 to 116 positioned on the inner peripheral surface of the through-hole 151, and melting and solidifying two or more sheets. More preferably, all the sheets are melted and solidified.
　融着部１５２は、図１０に示すように、シート融着体１０５の両面１０５ａ，１０５ｂの何れの面からも離間した位置に形成されている。
　シート融着体１０５の一方の面１０５ａから融着部１５２までの距離ｄ１（図１０参照）は、該面１０５ａの肌触りを良くする観点から、シート融着体１０５の厚みｔの５％以上であることが好ましい。距離ｄ１を大きくすることは融着部１５２とシート融着体１０５の面１０５ａとの離間を大きくすることであるが、その反面、融着部１５２の厚みｄ３が小さく密になり、逆に肌触りを悪化させることがあるため、距離ｄ１は、シート融着体１０５の厚みｔの１０～２０％であることがより望ましい。同様の観点から、前記距離ｄ１は、０．１ｍｍ以上であることが好ましく、より好ましくは０．２～０．３ｍｍである。
　シート融着体１０５の他方の面１０５ｂから融着部１５２までの距離ｄ２（図１０参照）は、該面１０５ｂの肌触りを良くする観点から、シート融着体１０５の厚みｔの５％以上であることが好ましく、より好ましくは、同厚みｔの１０～２０％である。同様の観点から、前記距離ｄ２は、０．１ｍｍ以上であることが好ましく、より好ましくは０．２～０．３ｍｍである。 As shown in FIG. 10, the fused portion 152 is formed at a position separated from any of the both surfaces 105 a and 105 b of the sheet fusion body 105.
The distance d1 (see FIG. 10) from one surface 105a of the sheet fusion body 105 to the fusion part 152 is 5% or more of the thickness t of the sheet fusion body 105 from the viewpoint of improving the touch of the surface 105a. Preferably there is. Increasing the distance d1 is to increase the separation between the fused portion 152 and the surface 105a of the sheet fused body 105, but on the other hand, the thickness d3 of the fused portion 152 becomes smaller and denser. The distance d1 is more preferably 10 to 20% of the thickness t of the sheet fusion body 105. From the same viewpoint, the distance d1 is preferably 0.1 mm or more, and more preferably 0.2 to 0.3 mm.
The distance d2 (see FIG. 10) from the other surface 105b of the sheet fusion body 105 to the fusion part 152 is 5% or more of the thickness t of the sheet fusion body 105 from the viewpoint of improving the touch of the surface 105b. Preferably, it is 10 to 20% of the same thickness t. From the same viewpoint, the distance d2 is preferably 0.1 mm or more, and more preferably 0.2 to 0.3 mm.
　また、融着部１５２は、シート融着体１０５の厚み方向における厚みｄ３（図１０参照）が、シート融着体１０５の前記厚みｔの３０％以上であることが好ましく、５０～９０％であることがより好ましい。シート融着体１０５の厚みｔに対する融着部１５２の厚みｄ３の割合を上記の範囲とすることにより、シートどうしを融着部１５２において一層強固に結合させるとともに肌触り良くすることができる。 Further, in the fused portion 152, the thickness d3 (see FIG. 10) in the thickness direction of the sheet fused body 105 is preferably 30% or more of the thickness t of the sheet fused body 105, and is preferably 50 to 90%. More preferably. By setting the ratio of the thickness d3 of the fused portion 152 to the thickness t of the sheet fused body 105 within the above range, the sheets can be more firmly bonded to each other at the fused portion 152 and the touch can be improved.
　なお、シート融着体１０５の厚みｔは、貫通孔１５１から１０ｍｍ以上離れている部分の厚みを、レーザー変位計などの非接触厚み計で測定する。距離ｄ１、距離ｄ２、融着部１５２の厚みｄ３は、シート融着体の断面を顕微鏡で撮像し、画像計測で測定することが好ましい。シート融着体の切断は、非接触で切断できるようレーザーでカットする方法が好ましい。 In addition, the thickness t of the sheet fusion body 105 is measured by a non-contact thickness meter such as a laser displacement meter at a portion that is 10 mm or more away from the through hole 151. The distance d1, the distance d2, and the thickness d3 of the fused part 152 are preferably measured by imaging the cross section of the sheet fused body with a microscope and measuring the image. The sheet fusion product is preferably cut by a laser so that it can be cut in a non-contact manner.
　本実施形態のシート融着体１０５は、貫通孔１５１の内周面に形成された融着部１５２において、該シート融着体１０５を構成するシートの融着により結合一体化しているため、シートどうしの接合強度が高い。 Since the sheet fusion body 105 of the present embodiment is united and integrated by fusing the sheets constituting the sheet fusion body 105 at the fusion part 152 formed on the inner peripheral surface of the through hole 151. The joint strength between the two is high.
　しかも、本実施形態のシート融着体１０５は、他の部分に比して硬くなり易い融着部１５２がシート融着体１０５の両面１０５ａ，１０５ｂの何れの面からも離間した位置に形成されているため、何れの面も肌触りが良好である。そのため、例えば、シート融着体１０５を、サニタリー用品等の肌に当てて使用する製品の肌に当たる面等に使用する場合等における肌触り等が向上する。本発明のシート融着体１０５は、融着部１５２が、両面１０５ａ，１０５ｂのうちの何れか一方の面からのみ離間したものであっても良い。この場合のシート融着体を、サニタリー用品等の肌に当てて使用する製品に用いる場合、融着部１５２が表面から離間している方の面を、肌に当たる面側に向けて使用することで、同様に良好な肌触りが得られる。なお、シート融着体１０５において、面１０５ａは、シート積層体１０１におけるレーザー光が照射された側の面１０１ａであり、面１０５ｂは、その反対側の面である。 In addition, the sheet fusion body 105 according to the present embodiment is formed at a position where the fusion part 152 that is likely to be harder than other parts is separated from both surfaces 105 a and 105 b of the sheet fusion body 105. Therefore, the touch of each surface is good. Therefore, for example, when the sheet fusion body 105 is used on a surface of a product used by being applied to the skin such as a sanitary product, the touch or the like is improved. In the sheet fusion body 105 of the present invention, the fusion part 152 may be separated from only one of the both surfaces 105a and 105b. When the sheet fusion body in this case is used for a product that is applied to the skin such as a sanitary product, the side where the fusion part 152 is separated from the surface should be used with the side facing the skin. Thus, a good touch can be obtained as well. In the sheet fusion body 105, the surface 105a is the surface 101a on the side of the sheet laminate 101 irradiated with the laser light, and the surface 105b is the opposite surface.
　更に、特許文献４に記載されている立体開孔不織布とは異なり、貫通孔１５１の開口周縁部が、シート融着体１０５の他方の面１０５ｂから突出していないので、パンツ型おむつの外装材などの様に両面が肌に触れる可能性があるところに使用することが可能である。 Furthermore, unlike the three-dimensional open nonwoven fabric described in Patent Document 4, the opening peripheral portion of the through-hole 151 does not protrude from the other surface 105b of the sheet fusion body 105. It can be used where there is a possibility that both sides may touch the skin.
　なお、シート融着体１０５の貫通孔１５１の大きさや貫通孔列中の貫通孔１５１間の間隔等は、シート融着体の用途やシート融着体に要求する接合強度等に応じて適宜に決定することができるが、一例を示せば、貫通孔１５１の開口面積としては、０．３～１０ｍｍ2が挙げられる。
　図１０に示すように、シート融着体の一方の面１０５ａ側と他方の面１０５ｂ側とで、貫通孔１５１の開口面積が異なる場合の貫通孔１５１の開口面積は、当該開口面積が広い方の面積とする。貫通孔１５１の開口面積は、シート融着体の厚み方向（Ｚ方向）における融着部１５２の端部において測定する。 Note that the size of the through-holes 151 of the sheet fusion body 105 and the interval between the through-holes 151 in the row of through-holes are appropriately determined depending on the use of the sheet fusion body and the bonding strength required for the sheet fusion body. As an example, the opening area of the through hole 151 is 0.3 to 10 mm 2 .
As shown in FIG. 10, when the opening area of the through hole 151 is different between the one surface 105a side and the other surface 105b side of the sheet fusion body, the opening area of the through hole 151 is larger. Area. The opening area of the through-hole 151 is measured at the end of the fused portion 152 in the thickness direction (Z direction) of the sheet fused body.
　本実施形態のシート融着体１０５は、例えば、下記の第１方法又は第２方法により効率良く製造することができる。 The sheet fusion body 105 of the present embodiment can be efficiently manufactured by, for example, the following first method or second method.
＜第１方法（レーザーを用いた方法）＞
　第１方法においては、図１１に示すように、複数枚のシート１１１～１１６を重ねて得たシート積層体１０１の一方の面に、複数の貫通孔１０３ａが所定のパターンで形成された押さえ部材１０３を当接させ、その状態のシート積層体１０１に対して、該押さえ部材１０３側からレーザー光１０４を照射して、該シート積層体１０１に、前述した融着部１５２を有する貫通孔１５１を形成する。図１１中、符号１０２は、シート積層体１０１の他方の面を支持する支持体である。 <First method (method using a laser)>
In the first method, as shown in FIG. 11, a pressing member in which a plurality of through holes 103a are formed in a predetermined pattern on one surface of a sheet laminate 101 obtained by stacking a plurality of sheets 111 to 116. 103 is brought into contact, and the sheet laminate 101 in that state is irradiated with laser light 104 from the side of the pressing member 103, so that the through-hole 151 having the above-described fused portion 152 is formed in the sheet laminate 101. Form. In FIG. 11, reference numeral 102 denotes a support that supports the other surface of the sheet laminate 101.
　図１１に、第１方法に好ましく用い得るレーザー式接合装置１１０を示した。
　レーザー式接合装置１１０は、図１２に示すように、矢印Ａ方向に回転駆動される搬送ロール１０２と、加圧ベルト１３２を備えたベルト式加圧装置１３１を備えている。
　ベルト式加圧装置１３１は、無端状の加圧ベルト１３２及び該加圧ベルト１３２が架け渡された状態で回転する３本のロール１３３ａ，１３３ｂ，１３３ｃを備えている。ベルト式加圧装置１３１の加圧ベルト１３２が、レーザー式接合装置１１０における押さえ部材１０３である。
　加圧ベルト１３２は、ロール１３３ａ，１３３ｂ，１３３ｃの何れか１以上を回転駆動して、搬送ロール１０２と同速度で移動する。また、搬送ロール１０２及び加圧ベルト１３２は、空冷、水冷等により温度を所定の温度範囲に維持することが好ましい。 FIG. 11 shows a laser-type bonding apparatus 110 that can be preferably used in the first method.
As shown in FIG. 12, the laser bonding apparatus 110 includes a belt-type pressure device 131 including a conveyance roll 102 that is rotationally driven in an arrow A direction and a pressure belt 132.
The belt-type pressure device 131 includes an endless pressure belt 132 and three rolls 133a, 133b, and 133c that rotate while the pressure belt 132 is stretched. The pressure belt 132 of the belt type pressure device 131 is the pressing member 103 in the laser type bonding device 110.
The pressure belt 132 rotates at least one of the rolls 133 a, 133 b, and 133 c and moves at the same speed as the transport roll 102. Moreover, it is preferable to maintain the temperature of the transport roll 102 and the pressure belt 132 within a predetermined temperature range by air cooling, water cooling, or the like.
　レーザー式接合装置１１０は、加圧ベルト１３２と搬送ロール１０２との間隔を増減調整できる間隔調整機構を有し、当該間隔の調整により、加圧ベルト１３２と搬送ロール１０２とによって、シート積層体１０１に加える圧力を適宜調整することができる。 The laser-type bonding apparatus 110 has an interval adjustment mechanism that can increase or decrease the interval between the pressure belt 132 and the conveyance roll 102, and the sheet stack 101 by the pressure belt 132 and the conveyance roll 102 by adjusting the interval. The pressure applied to can be adjusted as appropriate.
　シート積層体１０１は、図示しない案内ロール等によって、搬送ロール１０２の周面上に導入され、搬送ロール１０２に巻き掛けられるようにして搬送された後、図示しない導出ロール及びニップロール等によって搬送ロール１０２の周面から離れる。 The sheet laminated body 101 is introduced onto the peripheral surface of the transport roll 102 by a guide roll (not shown) and conveyed so as to be wound around the transport roll 102, and then the transport roll 102 by a lead roll and a nip roll (not shown). Get away from the circumference.
　加圧ベルト１３２には、金属又は樹脂製のメッシュベルトや、金属又は樹脂製のベルトにエッチングやパンチングにより多数の貫通孔を形成してなる開孔ベルト等が用いられる。押さえ部材１０３としてのメッシュベルトや開孔ベルトは、貫通孔１０３ａをレーザー光１０４が透過する一方、貫通孔１０３ａ以外の部分１０３ｂはレーザー光１０４を透過させない。
　搬送ロール１０２は、その周面がレーザー光１０４の透過性を有するものであっても良いし、その周面がレーザー光１０４の透過性を有しないものであっても良い。 As the pressure belt 132, a mesh belt made of metal or resin, an aperture belt formed by forming a large number of through holes in a metal or resin belt by etching or punching, or the like is used. The mesh belt or the aperture belt as the pressing member 103 transmits the laser beam 104 through the through hole 103 a, while the portion 103 b other than the through hole 103 a does not transmit the laser beam 104.
The transport roll 102 may have a peripheral surface that is transparent to the laser beam 104, or may have a peripheral surface that is not transparent to the laser beam 104.
　レーザー式接合装置１１０を用いた第１方法においては、複数枚のシートが重ねられたシート積層体１０１であって、少なくとも一枚のシートが、レーザー光１０４を吸収して発熱するものを用いる。シート積層体１０１又はそれから得られるシート融着体１０５は、複数枚のシート１１１～１１６のうちの総てが、レーザー光１０４を吸収して発熱するものであることが好ましい。
　なお、レーザー光１０４で部分的に融着する前のシート積層体１０１は、層間が全く接合されていないものであっても、融着以外の方法で部分的に接合されているものであっても良い。融着以外の方法で部分的に接合されている態様には、例えば、ホットメルト接着剤等の接着剤により接合されている態様が挙げられる。 In the first method using the laser bonding apparatus 110, a sheet laminated body 101 in which a plurality of sheets are stacked and at least one sheet generates heat by absorbing the laser beam 104 is used. In the sheet laminate 101 or the sheet fusion body 105 obtained therefrom, it is preferable that all of the plurality of sheets 111 to 116 absorb the laser beam 104 and generate heat.
Note that the sheet laminate 101 before being partially fused by the laser beam 104 is partially bonded by a method other than fusion, even if the layers are not bonded at all. Also good. Examples of the mode of being partially joined by a method other than fusion include a mode of being joined by an adhesive such as a hot melt adhesive.
　レーザー光１０４は、図１１に示すように、シート積層体１０１の一方の面１０１ａに押さえ部材１０３を当接させ、その状態のシート積層体１０１に対して該押さえ部材１０３側から照射する。このとき、シート積層体１０１の他方の面１０１ｂは、搬送ロール１０２の外周面に支持されている。
　また、レーザー光１０４を照射する際の、レーザーの出力（照射強度）や照射時間を制御することで、シート積層体１０１を構成する複数枚のシート１１１～１１６の総てを貫通し、且つ内周面に融着部１５２を有する貫通孔１５１を形成させる。図１２中、符号１４１は、レーザー光１０４を照射する照射ヘッド１４１であり、押さえ部材１０３である加圧ベルト１３２から所定の距離離間した特定の位置に固定されている。 As shown in FIG. 11, the laser beam 104 causes the pressing member 103 to come into contact with one surface 101 a of the sheet laminated body 101 and irradiates the sheet laminated body 101 in that state from the side of the pressing member 103. At this time, the other surface 101 b of the sheet laminate 101 is supported on the outer peripheral surface of the transport roll 102.
Further, by controlling the laser output (irradiation intensity) and the irradiation time when irradiating the laser beam 104, the plurality of sheets 111 to 116 constituting the sheet laminate 101 are all penetrated, and the inner A through hole 151 having a fused portion 152 is formed on the peripheral surface. In FIG. 12, reference numeral 141 denotes an irradiation head 141 that irradiates the laser beam 104, and is fixed at a specific position separated from the pressure belt 132 that is the pressing member 103 by a predetermined distance.
　図９に示すシート融着体１０５は、例えば、平面視矩形状の貫通孔が、ＭＤ方向及びＣＤ方向の両方向にそれぞれ多列に形成されたメッシュベルトや開孔ベルトを押さえ部材１０３として用い、レーザー光１０４を、ＭＤ方向に直列した貫通孔の１列分の幅で照射して得たものである。この場合、シート融着体１０５の製造時における機械方向（ＭＤ）に、融着部１５２を有する貫通孔１５１が一列のみ形成されている。これに代えて、レーザー光１０４を照射する幅を、ＭＤ方向に直列した貫通孔列の２列分の幅や３列分の幅、あるいはそれ以上の幅とし、ＭＤ方向に延びる貫通孔１５１が複数列形成されたシート融着体１０５を得ることもできる。また、貫通孔が千鳥状に配置された開孔ベルトを用いて、融着部１５２を有する貫通孔１５１が千鳥状に複数列形成されたシート融着体１０５を得ることもできる。 The sheet fusion body 105 shown in FIG. 9 uses, for example, a mesh belt or an aperture belt in which through holes having a rectangular shape in plan view are formed in multiple rows in both the MD direction and the CD direction, as the pressing member 103. This is obtained by irradiating the laser beam 104 with a width corresponding to one row of through holes in series in the MD direction. In this case, only one row of through-holes 151 having the fused portions 152 is formed in the machine direction (MD) when the sheet-fused body 105 is manufactured. Instead, the width of irradiation with the laser beam 104 is set to the width of two rows of through-hole rows in series in the MD direction, the width of three rows or more, and a through-hole 151 extending in the MD direction is provided. It is also possible to obtain the sheet fusion product 105 formed in a plurality of rows. Moreover, the sheet | seat melt | fusion body 105 by which the through-hole 151 which has the melt | fusion part 152 was formed in two or more rows in a zigzag form can also be obtained using the aperture belt by which the through-hole is arrange | positioned in a zigzag form.
　また、押さえ部材１０３の貫通孔に対応した配置の貫通孔１５１が形成されるようにする観点から、押さえ部材１０３の個々の貫通孔１０３ａは、ＭＤ及びＣＤ方向の寸法が、それぞれ２０ｍｍ以下であることが好ましい。また、押さえ部材１０３の開口率は、４０～９０％であることが好ましく、より好ましくは６０～８０％である。 Further, from the viewpoint of forming the through-holes 151 corresponding to the through-holes of the pressing member 103, the individual through-holes 103a of the pressing member 103 each have a dimension in the MD and CD directions of 20 mm or less. It is preferable. The opening ratio of the pressing member 103 is preferably 40 to 90%, more preferably 60 to 80%.
　レーザー光１０４の照射は、図１１に示すように、押さえ部材１０３で加圧した状態のシート積層体１０１に対して行うことが、シートの厚み内に収まる融着部１５２を形成させる観点から好ましい。
　また、レーザー光１０４の照射を、図１２に示すように、押さえ部材１０３で加圧して厚み方向に圧縮させた状態のシート積層体１０１に対して行い、レーザー光の照射後に、押さえ部材１０３による加圧を解除することも好ましい。シート積層体１０１が圧縮回復性を有する場合、圧縮状態でレーザー光１０４の照射を行った後、圧縮状態から解放することで、図１０に示すように、シートどうしが融着した融着部１５２が、両面１０５ａ，１０５ｂから離間した位置に形成されたシート融着体１０５を一層容易に得ることができる。 As shown in FIG. 11, the irradiation with the laser beam 104 is preferably performed on the sheet laminated body 101 in a state of being pressed by the pressing member 103 from the viewpoint of forming a fused portion 152 that fits within the thickness of the sheet. .
Further, as shown in FIG. 12, the laser beam 104 is irradiated to the sheet laminate 101 in a state of being compressed by the pressing member 103 and compressed in the thickness direction, and after the laser beam irradiation, the pressing member 103 is used. It is also preferable to release the pressure. In the case where the sheet laminate 101 has compression recoverability, after being irradiated with the laser beam 104 in a compressed state and then released from the compressed state, a fused portion 152 in which the sheets are fused as shown in FIG. However, it is possible to obtain the sheet fusion body 105 formed at a position separated from both surfaces 105a and 105b more easily.
　シート積層体１０１に照射するレーザー光が、該シート積層体を構成する個々のシートについて、該シートに吸収されて該シートを発熱させる波長であるか否かは、シートの材質と、使用するレーザー光の波長との関係で決まる。 Whether or not the laser light applied to the sheet laminate 101 is a wavelength that causes each sheet constituting the sheet laminate to be absorbed by the sheet and generates heat, depends on the material of the sheet and the laser used. It depends on the relationship with the wavelength of light.
　シート積層体１０１が、使い捨ておむつや生理用ナプキン等のサニタリー用品の製造に汎用される合成樹脂製の不織布やフィルムの積層体である場合、レーザーとしては、ＣＯ2レーザー、ＹＡＧレーザー、ＬＤレーザー（半導体レーザー）、ＹＶＯ4レーザー、ファイバーレーザー等を用いることが好ましい。また、シートが、合成樹脂として、ポリエチレン、ポリエチレンテレフタレート、ポリプロピレン等を含む場合、該シートに吸収され該シートを良好に発熱させ得る波長としては、例えば、８．０～１５μｍを用いることが好ましく、大容量のレーザー装置が存在するＣＯ２レーザーの発振波長の１０．６μｍを用いることが特に好ましい。
　例えば、ＣＯ２レーザーの照射の条件として、ＰＥＴやＰＰを主原料とする坪量２０ｇ／ｍ2程度の不織布シート６枚からなる静止したシート積層体を融着する場合、シート積層体を加圧密着させレーザー出力２１Ｗ以上、走査速度は２５０ｍｍ/秒以下で好ましく融着
することが可能である。これらの照射条件はシート積層体の物性値や搬送速度で大きく変化するのでここで示す条件の限りではない。 When the sheet laminate 101 is a laminate of a synthetic resin nonwoven fabric or film that is widely used in the manufacture of sanitary articles such as disposable diapers and sanitary napkins, the laser may be a CO 2 laser, YAG laser, LD laser ( (Semiconductor laser), YVO 4 laser, fiber laser or the like is preferably used. Further, when the sheet contains polyethylene, polyethylene terephthalate, polypropylene, or the like as a synthetic resin, it is preferable to use, for example, 8.0 to 15 μm as a wavelength that can be absorbed by the sheet and heat the sheet satisfactorily. It is particularly preferable to use 10.6 μm of the oscillation wavelength of a CO 2 laser in which a large-capacity laser device exists.
For example, as a condition for CO2 laser irradiation, when fusing a stationary sheet laminate consisting of six nonwoven fabric sheets with a basis weight of about 20 g / m 2 with PET or PP as the main raw material, the sheet laminate is pressed and adhered. The laser output is 21 W or more, and the scanning speed is 250 mm / second or less, so that it is possible to perform fusion preferably. These irradiation conditions are not limited to the conditions shown here because they vary greatly depending on the physical properties of the sheet laminate and the conveyance speed.
＜第２方法（熱針による穿孔加工）＞
　第２方法においては、複数枚のシート１１１～１１６が重ねられたシート積層体１０１に対して、加熱された針（熱針）を突き刺すことにより、該シート積層体１０１に、前述した融着部１５２を有する貫通孔１５１を形成する。 <Second method (drilling with a hot needle)>
In the second method, the above-mentioned fused portion is attached to the sheet laminate 101 by inserting a heated needle (heat needle) into the sheet laminate 101 in which a plurality of sheets 111 to 116 are stacked. A through hole 151 having 152 is formed.
　図１３に、第２方法に好ましく用い得る穿孔加工装置１０７を示す模式図である。図１３に示す穿孔加工装置１０７は、穿孔加工用の針付ロール１７１と、針付ロール１７１と対向配置された吸引把持ロール１７５とを備え、両ロール１７１，１７５間に導入したシート積層体１０１に、針付ロール１７１の外周面に突出する熱針１７２を突き刺すことにより、該シート積層体１０１に、融着部１５２を有する貫通孔１５１を形成するものである。 FIG. 13 is a schematic diagram showing a drilling apparatus 107 that can be preferably used in the second method. A punching apparatus 107 shown in FIG. 13 includes a roll 171 with a needle for punching, and a suction gripping roll 175 arranged to face the roll 171 with a needle, and the sheet laminate 101 introduced between both rolls 171 and 175. Further, a through-hole 151 having a fused portion 152 is formed in the sheet laminate 101 by piercing a thermal needle 172 protruding from the outer peripheral surface of the roll 171 with needle.
　針付ロール１７１は、内部に収容したヒーターにより加熱可能な金属製のロール本体１７３と、ロール本体１７３の周囲に筒状に設けられた断熱部１７４を有している。熱針１７２は、針付ロール１７１の周方向に所定の間隔で複数本設けられており、それぞれ、先端が断熱部１７４から突出するとともに基端側がロール本体１７３内に位置するように固定されている。熱針１７２は、ヒーターによる加熱により、所定の温度に加熱可能になされている。
　吸引把持ロール１７５は、図１４に示すように、外周面に吸引孔１７６を有しており、導入ロール１７７が配置された導入部１７５ａから導入されたシート積層体１０１を、吸引孔１７６からの吸引により外周面に吸着保持しながら、熱針１７２による穿孔加工部１７５ｂまで搬送すると共に、穿孔加工後のシート積層体１０１ないしシート融着体１０５を、吸引孔１７６からの吸引により外周面に吸着保持しながら、導出ロール１７８が配置された導出部１７５ｃまで搬送可能になされている。
　針付ロール１７１及び吸引把持ロール１７５は、図示しない駆動機構により図中の矢印方向に回転駆動される。図１４は、左右方向が、両ロール１７１，１７５の軸長方向である。 The roll with needle 171 includes a metal roll main body 173 that can be heated by a heater housed therein, and a heat insulating portion 174 that is provided in a cylindrical shape around the roll main body 173. A plurality of the thermal needles 172 are provided at predetermined intervals in the circumferential direction of the needle-attached roll 171. Each of the thermal needles 172 is fixed so that the distal end protrudes from the heat insulating portion 174 and the proximal end side is positioned in the roll body 173. Yes. The hot needle 172 can be heated to a predetermined temperature by heating with a heater.
As shown in FIG. 14, the suction gripping roll 175 has a suction hole 176 on the outer peripheral surface, and the sheet stack 101 introduced from the introduction portion 175 a where the introduction roll 177 is disposed is removed from the suction hole 176. While sucking and holding the outer peripheral surface by suction, it is transported to the punching portion 175b by the hot needle 172, and the sheet laminate 101 or the sheet fusion body 105 after punching is sucked by the suction hole 176 to the outer peripheral surface. While being held, it can be conveyed to the lead-out part 175c where the lead-out roll 178 is arranged.
The roll with needle 171 and the suction gripping roll 175 are rotationally driven in the direction of the arrow in the figure by a driving mechanism (not shown). In FIG. 14, the left-right direction is the axial length direction of both rolls 171, 175.
　上述した穿孔加工装置１０７によれば、吸引把持ロール１７５に吸着保持した状態のシート積層体１０１に対して熱針１７２による穿孔加工を行うことができると共に、穿孔加工後のシート積層体１０１ないしシート融着体１０５を吸引しつつ搬送することにより、シートが溶融して一体化した部分の固化が、吸引による空冷により促進される。
　そのため、融着部１５２が、シートの一方の面１０５ａ又は好ましくは両面１０５ａ，１０５ｂから離間したシート融着体１０５を効率よく製造することができる。 According to the punching device 107 described above, punching with the hot needle 172 can be performed on the sheet laminate 101 in the state of being sucked and held by the suction gripping roll 175, and the sheet laminate 101 or sheet after punching is performed. By conveying the fused body 105 while sucking, solidification of the melted and integrated portion of the sheet is promoted by air cooling by suction.
Therefore, it is possible to efficiently manufacture the sheet fusion body 105 in which the fused portion 152 is separated from the one surface 105a of the sheet or preferably from the both surfaces 105a and 105b.
　融着部１５２が、シートの一方の面１０５ａ又は好ましくは両面１０５ａ，１０５ｂから離間したシート融着体１０５を効率よく製造する観点等から、熱針１７２の温度は、シート融着体１０５を構成するシートの樹脂溶融温度以上であることが好ましく、２００～３００℃であることがより好ましい。
　シート融着体を構成するシートの樹脂溶融温度とは、該シート融着体が、同一組成の１種類のシートからなる場合は、当該シートの構成繊維の融点であり、該シート融着体が、組成の異なる複数種類のシートからなる場合は、当該シートの構成繊維の融点のうち、最も高い温度である。 From the viewpoint of efficiently producing the sheet fusion body 105 separated from the one surface 105a of the sheet or preferably from both surfaces 105a and 105b, the temperature of the hot needle 172 constitutes the sheet fusion body 105. The temperature is preferably equal to or higher than the resin melting temperature of the sheet to be formed, and more preferably 200 to 300 ° C.
The resin melting temperature of the sheet constituting the sheet fusion body is the melting point of the constituent fibers of the sheet when the sheet fusion body is composed of one type of sheet having the same composition. In the case of a plurality of types of sheets having different compositions, it is the highest temperature among the melting points of the constituent fibers of the sheet.
　また、針付ロール１７１の断熱部１７４と吸引把持ロール１７５との間のクリアランスＰは、シート融着体１０５の非加圧状態の厚みの８０％以下、特に３０～７０％であることが、肌触りや溶融部の硬さの面から好ましい。なお、断熱部１７４の形成材料としては、断熱ウレタンやグラスウールやロックウール等が挙げられる。 Further, the clearance P between the heat insulating portion 174 of the needle-attached roll 171 and the suction gripping roll 175 is 80% or less, particularly 30 to 70%, of the non-pressurized thickness of the sheet fusion body 105. It is preferable from the surface of the touch and the hardness of a fusion | melting part. In addition, as a forming material of the heat insulation part 174, heat insulation urethane, glass wool, rock wool, etc. are mentioned.
　また、熱針１７２による穿孔加工を行う際には、図１４に示すように、一部の吸引孔１７６ａからの吸引を停止するとともに、その吸引孔１７６ａに熱針１７２の先端が挿入されるように穿孔加工を行うことが、効率よくかつシート融着体の上面から下面まで強固に接合する点から好ましい。 Further, when drilling with the hot needle 172, as shown in FIG. 14, the suction from a part of the suction holes 176a is stopped, and the tip of the hot needle 172 is inserted into the suction holes 176a. It is preferable to perform perforation processing from the viewpoint of efficiently joining firmly from the upper surface to the lower surface of the sheet fusion body.
　熱針１７２の先端が挿入される吸引孔１７６の径は、熱針１７２の挿入部の径に対し大きくする必要があるが、融着部１５２や貫通孔の開口周縁部が、加工後面１０５ｂ（図１４参照）から突出しないようにする観点から、吸引孔１７６の径は、熱針１７２の径（吸引孔１７６に挿入された部分の最大径）に対し、プラス３ｍｍ以下であることが望ましい。 The diameter of the suction hole 176 into which the tip of the thermal needle 172 is inserted needs to be larger than the diameter of the insertion portion of the thermal needle 172. However, the fusion peripheral portion 152 and the opening peripheral edge of the through hole are formed on the processed surface 105b ( From the viewpoint of preventing the protrusion from seeing in FIG. 14, the diameter of the suction hole 176 is desirably 3 mm or less with respect to the diameter of the thermal needle 172 (the maximum diameter of the portion inserted into the suction hole 176).
　また、レーザーによる穿孔加工及び熱針による穿孔加工の何れにおいても、シート積層体を加圧して融着することで、実際に使用される非加圧時のシート融着体の弾性回復により、より一層有効に溶着部をシート融着体の面から離間することができる。 Also, in both the drilling by laser and the punching by hot needle, by pressing and fusing the sheet laminated body, the elastic recovery of the sheet fusion body at the time of non-pressurization that is actually used is more The welded portion can be separated from the surface of the sheet fusion body more effectively.
　本発明のシート融着体は、そのまま、あるいは他の部材と一体化されて各種の物品として用いることができる。各種の物品としては、例えば、使い捨ておむつや生理用ナプキン、失禁パッド等の吸収性物品や、床面清掃用のシート、身体清拭用のシート等が挙げられる。
　例えば、吸収性物品を構成するシート融着体としては、パンツ型使い捨ておむつの外装体における前身頃の両側部に位置する部分と後身頃の両側部に位置する部分とを重ねて部分的に融着したもの、ウイング部付きの生理用ナプキンにおける、表面シートとウイング部形成用シートと裏面シートとを、適宜の順に積層して部分的に融着して一体化したもの、吸収性物品の肌当接面を形成する表面シートと、非肌当接面を形成する裏面シートと、撥水性のサイドシートとを重ねて部分的に融着したもの等が挙げられる。 The sheet fusion product of the present invention can be used as various articles as it is or integrated with other members. Examples of various articles include absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads, floor cleaning sheets, body wiping sheets, and the like.
For example, as a sheet fusion body constituting an absorbent article, a part located on both sides of the front body and a part located on both sides of the back body of the exterior body of a pants-type disposable diaper are overlapped and partially melted. Wearable, sanitary napkin with wing part, top sheet, wing part forming sheet, and back sheet laminated in appropriate order and partially fused and integrated, skin of absorbent article Examples include a surface sheet that forms an abutment surface, a back sheet that forms a non-skin abutment surface, and a water-repellent side sheet, which are partially fused.
　シート積層体に含まれて互いに融着されるシートとしては、各種製法による不織布、樹脂フィルム、不織布化されていない繊維ウエブ等が挙げられる。また、厚み方向に隣接する２枚のシートの一方又は双方は、熱可塑性樹脂からなる繊維を含むことが好ましい。熱可塑性樹脂としては、例えば、ポリプロピレン等のポリオレフィン、ポリエチレンテレフタレート等のポリエステル、ポリアミド等が挙げられ、これらの２以上の樹脂からなる複合繊維等を用いることもできる。 Examples of the sheet contained in the sheet laminate and fused together include non-woven fabrics, resin films, fiber webs that have not been made non-woven fabrics, and the like by various manufacturing methods. Moreover, it is preferable that one or both of the two sheets adjacent in the thickness direction include fibers made of a thermoplastic resin. Examples of the thermoplastic resin include polyolefin such as polypropylene, polyester such as polyethylene terephthalate, polyamide, and the like, and composite fibers composed of these two or more resins can also be used.
　以上、本発明（第１～第３発明）をその実施形態に基づいて説明したが、本発明（第１～第３発明）は、上述した実施形態に制限されることなく、本発明の趣旨を逸脱しない範囲で適宜変更が可能である。
　例えば、シート積層体１は、４枚のシートが重ねられたものの他、２枚、３枚又は５枚以上のシートが重ねられたものであっても良い。また、融着されるシートは、シート積層体１に含まれる総てのシートであることが好ましいが、３枚以上のシートのうちの２枚等であっても良い。
　また、シート積層体１０１及び／又はシート融着体（積層シート）１０５は、６枚のシートが重ねられたものの他、２枚～５枚又は７枚以上のシートが重ねられ、それらが貫通孔の内周面に設けられた融着部で結合しているものであっても良い。また、融着されるシートは、シート積層体１０１に含まれる総てのシートであることが好ましい。 The present invention (first to third inventions) has been described based on the embodiments. However, the present invention (first to third inventions) is not limited to the above-described embodiments, and the gist of the present invention. Changes can be made as appropriate without departing from the scope.
For example, the sheet laminate 1 may be one in which two sheets, three sheets, or five or more sheets are stacked in addition to a stack of four sheets. The sheets to be fused are preferably all the sheets included in the sheet laminate 1, but may be two of three or more sheets.
In addition, the sheet laminate 101 and / or the sheet fusion body (laminated sheet) 105 is a laminate of 6 to 5 sheets, 2 to 5 sheets, or 7 or more sheets, and these are through holes. They may be joined by a fusion part provided on the inner peripheral surface. Moreover, it is preferable that the sheets to be fused are all sheets included in the sheet laminate 101.
　また、上述した実施形態のように、帯状のシート積層体１，１０１に、連続的にレーザー光を照射するのに変えて、帯状のシート積層体に所定の間隔でレーザー光を照射しても良い。また、シート積層体は帯状でなくても良く、例えば矩形状に切断されたシートを複数枚重ねてシート積層体とし、これに、平板状の押さえ部材を載せて、レーザー光を照射することもできる。この場合、レーザー光の照射点を移動させずにシート積層体を移動させても良いし、シート積層体を移動させずにレーザー光の照射点を移動させることもできる。また、シート積層体１，１０１を、押さえ部材３，１０３と共に加圧する部材は、上述した実施形態の搬送ロール２，１０２のように円柱状の周面を有するものに限られない。
　また、円筒状の押さえ部材である円筒ロールは、貫通孔６ａが、ロールの周方向の全周に亘って形成されているものであっても良い。 Further, as in the above-described embodiment, the belt-shaped sheet laminates 1 and 101 may be irradiated with laser light at a predetermined interval instead of being continuously irradiated with laser light. good. Further, the sheet laminate may not be in the form of a belt, for example, a plurality of sheets cut into a rectangular shape may be stacked to form a sheet laminate, and a flat pressing member may be placed on the sheet laminate and irradiated with laser light. it can. In this case, the sheet laminate may be moved without moving the laser light irradiation point, or the laser light irradiation point may be moved without moving the sheet laminate. Moreover, the member which presses the sheet | seat laminated bodies 1 and 101 with the pressing members 3 and 103 is not restricted to what has a cylindrical peripheral surface like the conveyance rolls 2 and 102 of embodiment mentioned above.
Moreover, the cylindrical roll which is a cylindrical pressing member may have the through holes 6a formed over the entire circumference in the circumferential direction of the roll.
　また、シート融着体に形成される融着部５１は、その中央部に貫通孔を有するものであっても良い。その場合、シートどうしの融着部５１が、シート融着体に形成された貫通孔の内周面に形成されており、該融着部５１は、シート融着体の一方の面から離間した位置に形成され、且つ前記貫通孔の開口周縁部が、シート融着体の他方の面から突出していないことが好ましい。
　上述した一の実施形態における説明省略部分及び一の実施形態のみが有する要件は、それぞれ他の実施形態に適宜適用することができ、また、各実施形態における要件は、適宜、実施形態間で相互に置換可能である。 Moreover, the fusion | fusion part 51 formed in a sheet fusion body may have a through-hole in the center part. In that case, the fusion part 51 of sheets is formed in the inner peripheral surface of the through-hole formed in the sheet fusion body, and this fusion part 51 was spaced apart from one side of the sheet fusion body. It is preferable that the opening peripheral edge portion of the through hole is not protruded from the other surface of the sheet fusion body.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.
　上述した実施形態に関し、本発明はさらに以下の製造方法、或いは吸収性物品の製造方法、或いはシート融着体を開示する。 Regarding the above-described embodiment, the present invention further discloses the following production method, production method for absorbent articles, or sheet fusion product.
＜１＞複数枚のシートが重ねられたシート積層体にレーザー光を照射することにより、シート積層体内のシートどうしが融着したシート融着体を得るシート融着体の製造方法であって、前記シート積層体の一方の面に、複数の貫通孔が所定のパターンで形成された押さえ部材を当接し、その状態のシート積層体に対して、該押さえ部材側から、前記一方の面を構成するシートに吸収され該シートを発熱させる波長のレーザー光を照射することにより、シートどうしの融着部が、前記貫通孔の形成パターンに対応するパターンで形成されたシート融着体を得るシート融着体の製造方法。 <1> A method for producing a sheet fusion body, which obtains a sheet fusion body in which sheets in a sheet laminate are fused by irradiating a laser beam onto a sheet lamination body in which a plurality of sheets are laminated, A pressing member having a plurality of through holes formed in a predetermined pattern is brought into contact with one surface of the sheet laminate, and the one surface is configured from the pressing member side with respect to the sheet laminate in that state. By irradiating a laser beam having a wavelength which is absorbed by the sheet to be heated and heats the sheet, a sheet fusion is obtained in which the fused part of the sheets is formed in a pattern corresponding to the formation pattern of the through holes. A manufacturing method of a kimono.
＜２＞複数枚のシートの少なくとも一枚に圧縮回復性を有するシートを用い、前記押さえ部材で加圧して圧縮した状態のシート積層体に対して前記レーザー光を照射した後、前記押さえ部材による加圧を解除することにより、前記シートどうしの融着部が凹部となったシート融着体を得る前記＜１＞に記載のシート融着体の製造方法。
＜３＞前記圧縮回復性を有するシートは、繊維間に空隙を有する繊維集合体シートである不織布又は不織布化されていない繊維ウエブである、前記＜２＞に記載のシート融着体の製造方法。
＜４＞帯状のシート積層体を連続搬送しつつ、該シート積層体に、ロール間に架け渡された無端状の押さえ部材を押し付け、その状態下のシート積層体にレーザー光を照射し、帯状のシート融着体を連続的に形成する、前記＜１＞～＜３＞の何れかに記載のシート融着体の製造方法。
＜５＞帯状のシート積層体を連続搬送しつつ、該シート積層体を円筒状の押さえ部材に当接させ、その状態のシート積層体に、該押さえ部材の内側よりレーザー光を照射し、帯状のシート融着体を連続的に形成する、前記＜１＞～＜３＞の何れかに記載のシート融着体の製造方法。
＜６＞前記押さえ部材における、前記シート積層体を加圧する面とは反対側に負圧空間を設け、該負圧空間を通してレーザー光を、該押さえ部材側からシート積層体に照射する、前記＜１＞～＜５＞の何れかに記載のシート融着体の製造方法。
＜７＞前記シートどうしの融着部が、シート融着体に形成された貫通孔の内周面に形成されており、該融着部は、シート融着体の一方の面から離間した位置に形成され、且つ前記貫通孔の開口周縁部が、シート融着体の他方の面から突出していない、前記＜１＞～＜６＞の何れかに記載のシート融着体の製造方法。
＜８＞前記＜１＞～＜７＞の何れかに記載のシート融着体の製造方法によりシート融着体を製造する工程を含む、吸収性物品の製造方法。
＜９＞前記吸収性物品が、パンツ型おむつであり、パンツの外装体を構成するシート部材を幅方向に折り畳み、サイドシール部を形成してシート融着体とする、前記＜８＞に記載の吸収性物品の製造方法。 <2> Using a sheet having compression recoverability as at least one of a plurality of sheets, irradiating the laser beam on the sheet laminated body pressed and compressed by the pressing member, and then using the pressing member The method for producing a sheet fusion body according to <1>, wherein by releasing the pressurization, a sheet fusion body in which a fusion portion between the sheets becomes a concave portion is obtained.
<3> The method for producing a sheet fusion product according to <2>, wherein the sheet having compression recoverability is a non-woven fabric or a non-woven fiber web that is a fiber assembly sheet having voids between fibers. .
<4> While continuously transporting the belt-shaped sheet laminate, the endless pressing member stretched between the rolls is pressed against the sheet laminate, and the sheet laminate under the state is irradiated with laser light, The method for producing a sheet fusion body according to any one of <1> to <3>, wherein the sheet fusion body is continuously formed.
<5> While continuously transporting the belt-shaped sheet laminate, the sheet laminate is brought into contact with a cylindrical pressing member, and the sheet laminate in that state is irradiated with laser light from the inside of the pressing member, The method for producing a sheet fusion body according to any one of <1> to <3>, wherein the sheet fusion body is continuously formed.
<6> In the pressing member, a negative pressure space is provided on a side opposite to a surface that pressurizes the sheet laminated body, and laser light is irradiated to the sheet laminated body from the pressing member side through the negative pressure space. 1> to <5> The method for producing a sheet fusion bonded body according to any one of the above.
<7> A fusion part between the sheets is formed on an inner peripheral surface of a through-hole formed in the sheet fusion body, and the fusion part is spaced from one surface of the sheet fusion body. The method for producing a sheet fusion body according to any one of <1> to <6>, wherein the opening peripheral edge portion of the through hole is not protruded from the other surface of the sheet fusion body.
<8> A method for producing an absorbent article, comprising a step of producing a sheet fusion product by the method for producing a sheet fusion product according to any one of <1> to <7>.
<9> The above-mentioned <8>, wherein the absorbent article is a pants-type diaper, and a sheet member constituting an outer body of the pants is folded in a width direction to form a side seal portion to form a sheet fusion body. Manufacturing method for absorbent articles.
＜１０＞複数枚のシートが積層されて部分的に融着されているシート融着体であって、
　複数の貫通孔が形成されており、該貫通孔の内周面に、複数枚のシートが融着した融着部が形成されており、前記融着部は、シート融着体の一方の面から離間した位置に形成されており、且つ前記貫通孔の開口周縁部が、該シート融着体の他方の面から突出していない、シート融着体。 <10> A sheet fusion body in which a plurality of sheets are laminated and partially fused,
A plurality of through holes are formed, and a fusion part in which a plurality of sheets are fused is formed on the inner peripheral surface of the through hole, and the fusion part is formed on one surface of the sheet fusion body. The sheet fusion body is formed at a position separated from the sheet and the opening peripheral edge portion of the through hole does not protrude from the other surface of the sheet fusion body.
＜１１＞前記融着部は、前記シート融着体の何れの面からも離間した位置に形成されている、前記＜１０＞に記載のシート融着体。
＜１２＞前記融着部は、前記シート融着体の厚み方向における厚みが該シート融着体の厚みの３０％以上である、前記＜１１＞に記載のシート融着体。
＜１３＞前記融着部が、レーザー光の照射により形成されている、前記＜１０＞～＜１２＞の何れかに記載のシート融着体。
＜１４＞前記融着部が、複数枚のシートが重ねられたシート積層体に熱針を突き刺して形成されている、前記＜１０＞～＜１３＞の何れかに記載のシート融着体。 <11> The sheet fusion body according to <10>, wherein the fusion part is formed at a position separated from any surface of the sheet fusion body.
<12> The sheet fusion body according to <11>, wherein the fusion part has a thickness in the thickness direction of the sheet fusion body of 30% or more of the thickness of the sheet fusion body.
<13> The sheet fusion body according to any one of <10> to <12>, wherein the fusion part is formed by laser light irradiation.
<14> The sheet fusion body according to any one of <10> to <13>, wherein the fusion part is formed by inserting a hot needle into a sheet laminate in which a plurality of sheets are stacked.
　以下、本発明を実施例を用いて更に具体的に説明するが、本発明は、かかる実施例によって何ら制限されるものではない。
　芯部がポリエチレンテレフタレート、鞘部がポリエチレンからなる芯鞘型複合繊維を構成繊維とする坪量１６ｇ/ｍ2のスパンボンド不織布と坪量２０ｇ/ｍ2のエアスルー不織布とを混在させてシート積層体を得た。具体的には、エアスルー不織布、スパンボンド不織布、エアスルー不織布、エアスルー不織布、スパンボンド不織布、エアスルー不織布の順に６枚重ねてシート積層体とした。
　これを、金属製の線径が０．２９ｍｍ、開き目が０．５ｍｍ、開孔形状が正方形で開孔率が６３．３％の縦横が１００×１００ｍｍの平織メッシュからなる押さえ部材３と、金属製の厚さ１０ｍｍの平板との間で加圧し、厚みを加圧前の厚みの２０％に圧縮した状態において、押さえ部材３側からレーザー光を照射し、シート融着体を得た。レーザー光としては、ＣＯ2レーザーを、レーザーのスポット径０．１７ｍｍ、出力１８Ｗで走査速度２５０ｍｍ/ｓで照射した。押さえ部材にレーザー光を走査して、ＭＤ方向に直列した貫通孔の１列分の幅で照射した。貫通孔１個の照射時間はおおよそ２ｍｓｅｃである。得られたシート融着体の顕微鏡写真を図１５に示す。 EXAMPLES Hereinafter, although this invention is demonstrated further more concretely using an Example, this invention is not restrict | limited at all by this Example.
A sheet laminate in which a spunbonded nonwoven fabric having a basis weight of 16 g / m 2 and an air-through nonwoven fabric having a basis weight of 20 g / m 2 are mixed with a core-sheath composite fiber having a core portion made of polyethylene terephthalate and a sheath portion made of polyethylene Got. Specifically, six sheets of an air-through nonwoven fabric, a spunbond nonwoven fabric, an air-through nonwoven fabric, an air-through nonwoven fabric, a spunbond nonwoven fabric, and an air-through nonwoven fabric were stacked in this order to form a sheet laminate.
The pressing member 3 made of a plain woven mesh having a metal wire diameter of 0.29 mm, an opening of 0.5 mm, an aperture shape of square, an aperture ratio of 63.3%, and a length and width of 100 × 100 mm, In a state where pressure was applied between a metal flat plate having a thickness of 10 mm and the thickness was compressed to 20% of the thickness before pressing, a laser beam was irradiated from the pressing member 3 side to obtain a sheet fusion body. As the laser light, a CO2 laser was irradiated at a laser spot diameter of 0.17 mm, an output of 18 W, and a scanning speed of 250 mm / s. The pressing member was scanned with a laser beam and irradiated with a width corresponding to one row of through holes arranged in series in the MD direction. The irradiation time of one through hole is approximately 2 msec. A micrograph of the obtained sheet fusion product is shown in FIG.
　得られたシート融着体には、融着部５１が一定の間隔を開けて一列に形成されており、融着部５１の間隔は、平織メッシュの目の間隔と略一致していた。融着部５１の列が延びる方向における個々の融着部の長さはおおよそ０．６８ｍｍ、融着部同士間に存する非又は低融着部の長さはおおよそ０．１２ｍｍであり、融着部５１の列が延びる方向に直交する方向の個々の融着部の長さはおおよそ０．３７ｍｍであった。また、融着部５１においては、シート融着体を構成する総てのシートが一体化されていた。融着部５１の大きさは、平織メッシュの目の大きさに比して面積比でおおよそ１．０１となる。融着部５１の形は、図１５に示すように、角が滑らかな長方形である。融着部５１は、不織布の構成繊維が、溶融し穴が生じ穴の縁の部分で繊維同士が一体化しており、融着部５１が、他の部分の表面とは明瞭に区別して認識されるものであった。また、シート融着体における、融着部５１が形成された部分は該シート融着体の両面とも凹部となっており、融着部５１における厚みＴ３は、融着部５１以外の部分の厚みＴ４の１０～２５％であった。
　また、シート融着体の表面を手で触ったところ、何れの面についても融着部５１の硬さは感じられなかった。 In the obtained sheet fusion product, fusion parts 51 were formed in a line at regular intervals, and the gaps between the fusion parts 51 were approximately the same as the intervals between the meshes of the plain woven mesh. The length of each fused part in the direction in which the row of fused parts 51 extends is approximately 0.68 mm, and the length of the non- or low fused part existing between the fused parts is approximately 0.12 mm. The length of each fused part in the direction orthogonal to the direction in which the rows of the parts 51 extend was approximately 0.37 mm. Moreover, in the fusion | melting part 51, all the sheets which comprise a sheet fusion body were integrated. The size of the fused portion 51 is approximately 1.01 in terms of the area ratio as compared with the size of the mesh of the plain weave mesh. The shape of the fused part 51 is a rectangle with smooth corners, as shown in FIG. In the fused portion 51, the constituent fibers of the nonwoven fabric are melted to form a hole, and the fibers are integrated at the edge portion of the hole, and the fused portion 51 is clearly distinguished from the surface of the other portion. It was something. Moreover, the part in which the melt | fusion part 51 was formed in the sheet | seat melt | fusion body is a recessed part on both surfaces of this sheet | seat melt body, and thickness T3 in the melt | fusion part 51 is the thickness of parts other than the melt | fusion part 51. It was 10-25% of T4.
Further, when the surface of the sheet fusion body was touched by hand, the hardness of the fusion part 51 was not felt on any surface.
　本発明（第１発明）のシート融着体の製造方法によれば、シートどうしの融着部が所定の状態に配置され、その融着部の配置が視認し易く、やわらかい肌触り感のシート融着体を効率的に製造することができる。 According to the method for manufacturing a sheet fusion body of the present invention (first invention), the fused portions of the sheets are arranged in a predetermined state, the arrangement of the fused portions is easy to visually recognize, and the sheet fusion with a soft touch feeling is provided. A kimono can be manufactured efficiently.
　本発明（第３発明）のシート融着体（積層シート）は、シートどうしの接合強度が高く、肌触りも良好である。 The sheet fusion product (laminated sheet) of the present invention (third invention) has high bonding strength between sheets and good touch.

Claims (14)

  1. 　複数枚のシートが重ねられたシート積層体にレーザー光を照射することにより、シート積層体内のシートどうしが融着したシート融着体を得るシート融着体の製造方法であって、
    　前記シート積層体の一方の面に、複数の貫通孔が所定のパターンで形成された押さえ部材を当接し、その状態のシート積層体に対して、該押さえ部材側から、前記一方の面を構成するシートに吸収され該シートを発熱させる波長のレーザー光を照射することにより、シートどうしの融着部が、前記貫通孔の形成パターンに対応するパターンで形成されたシート融着体を得るシート融着体の製造方法。     A method for producing a sheet fusion product, which is obtained by irradiating a laser beam onto a sheet laminate in which a plurality of sheets are laminated to obtain a sheet fusion product in which sheets in the sheet laminate are fused.
    A pressing member having a plurality of through holes formed in a predetermined pattern is brought into contact with one surface of the sheet laminate, and the one surface is configured from the pressing member side with respect to the sheet laminate in that state. By irradiating a laser beam having a wavelength which is absorbed by the sheet to be heated and heats the sheet, a sheet fusion is obtained in which the fused part of the sheets is formed in a pattern corresponding to the formation pattern of the through holes. A manufacturing method of a kimono.
  2. 　複数枚のシートの少なくとも一枚に圧縮回復性を有するシートを用い、前記押さえ部材で加圧して圧縮した状態のシート積層体に対して前記レーザー光を照射した後、前記押さえ部材による加圧を解除することにより、前記シートどうしの融着部が凹部となったシート融着体を得る請求項１記載のシート融着体の製造方法。 Using a sheet having compression recoverability as at least one of a plurality of sheets, after irradiating the laser beam on the sheet laminate pressed and compressed by the pressing member, pressurizing by the pressing member The manufacturing method of the sheet fusion body of Claim 1 which obtains the sheet fusion body by which the melt | fusion part of the said sheets became a recessed part by cancelling | releasing.
  3. 　前記圧縮回復性を有するシートは、繊維間に空隙を有する繊維集合体シートである不織布又は不織布化されていない繊維ウエブである、請求項２記載のシート融着体の製造方法。 3. The method for producing a sheet fusion product according to claim 2, wherein the sheet having compression recovery property is a non-woven fabric or a non-woven fabric fiber web which is a fiber assembly sheet having voids between fibers.
  4. 　帯状のシート積層体を連続搬送しつつ、該シート積層体に、ロール間に架け渡された無端状の押さえ部材を押し付け、その状態下のシート積層体にレーザー光を照射し、帯状のシート融着体を連続的に形成する、請求項１～３の何れか１項記載のシート融着体の製造方法。 While continuously transporting the belt-shaped sheet laminate, an endless pressing member spanned between the rolls is pressed against the sheet laminate, and the laser beam is irradiated to the sheet laminate under the state to melt the belt-shaped sheet melt. The method for producing a sheet fusion body according to any one of claims 1 to 3, wherein the adhesion body is continuously formed.
  5. 　帯状のシート積層体を連続搬送しつつ、該シート積層体を円筒状の押さえ部材に当接させ、その状態のシート積層体に、該押さえ部材の内側よりレーザー光を照射し、帯状のシート融着体を連続的に形成する、請求項１～３の何れか１項記載のシート融着体の製造方法。 While continuously transporting the belt-shaped sheet stack, the sheet stack is brought into contact with a cylindrical pressing member, and the sheet stack in that state is irradiated with laser light from the inside of the pressing member to melt the strip-shaped sheet. The method for producing a sheet fusion body according to any one of claims 1 to 3, wherein the adhesion body is continuously formed.
  6. 　前記押さえ部材における、前記シート積層体を加圧する面とは反対側に負圧空間を設け、該負圧空間を通してレーザー光を、該押さえ部材側からシート積層体に照射する、請求項１～５の何れか１項記載のシート融着体の製造方法。 A negative pressure space is provided on the side of the pressing member opposite to the surface that pressurizes the sheet laminate, and laser light is irradiated to the sheet laminate from the side of the pressing member through the negative pressure space. The manufacturing method of the sheet fusion body of any one of these.
  7. 　前記シートどうしの融着部が、シート融着体に形成された貫通孔の内周面に形成されており、該融着部は、シート融着体の一方の面から離間した位置に形成され、且つ前記貫通孔の開口周縁部が、シート融着体の他方の面から突出していない、請求項１～６の何れか１項に記載のシート融着体の製造方法。 A fused portion between the sheets is formed on an inner peripheral surface of a through hole formed in the sheet fused body, and the fused portion is formed at a position separated from one surface of the sheet fused body. The method for manufacturing a sheet fusion body according to any one of claims 1 to 6, wherein an opening peripheral edge portion of the through hole does not protrude from the other surface of the sheet fusion body.
  8. 　請求項１～７の何れか１項記載のシート融着体の製造方法によりシート融着体を製造する工程を含む、吸収性物品の製造方法。 A method for producing an absorbent article, comprising a step of producing a sheet fusion product by the method for producing a sheet fusion product according to any one of claims 1 to 7.
  9. 　前記吸収性物品が、パンツ型おむつであり、パンツの外装体を構成するシート部材を幅方向に折り畳み、サイドシール部を形成してシート融着体とする、請求項８記載の吸収性物品の製造方法。 The absorbent article according to claim 8, wherein the absorbent article is a pants-type diaper, and a sheet member constituting an exterior body of the pants is folded in a width direction to form a side seal portion to form a sheet fusion body. Production method.
  10. 　複数枚のシートが積層されて部分的に融着されているシート融着体であって、
    　複数の貫通孔が形成されており、該貫通孔の内周面に、複数枚のシートが融着した融着部が形成されており、
    　前記融着部は、シート融着体の一方の面から離間した位置に形成されており、且つ前記貫通孔の開口周縁部が、該シート融着体の他方の面から突出していない、シート融着体。     A sheet fusion body in which a plurality of sheets are laminated and partially fused,
    A plurality of through holes are formed, and a fusion part in which a plurality of sheets are fused is formed on the inner peripheral surface of the through hole,
    The fused portion is formed at a position spaced from one surface of the sheet fusion body, and the opening peripheral edge of the through hole does not protrude from the other surface of the sheet fusion body. Kimono.
  11. 　前記融着部は、前記シート融着体の何れの面からも離間した位置に形成されている、請求項１０に記載のシート融着体。 The sheet fusion body according to claim 10, wherein the fusion part is formed at a position separated from any surface of the sheet fusion body.
  12. 　前記融着部は、前記シート融着体の厚み方向における厚みが該シート融着体の厚みの３０％以上である、請求項１１に記載のシート融着体。 The sheet fusion body according to claim 11, wherein the thickness of the fused portion in the thickness direction of the sheet fusion body is 30% or more of the thickness of the sheet fusion body.
  13. 　前記融着部が、レーザー光の照射により形成されている、請求項１０～１３の何れか１項に記載のシート融着体。 The sheet fusion body according to any one of claims 10 to 13, wherein the fusion part is formed by laser light irradiation.
  14. 　前記融着部が、複数枚のシートが重ねられたシート積層体に熱針を突き刺して形成されている、請求項１０～１３の何れか１項に記載のシート融着体。 The sheet fusion body according to any one of claims 10 to 13, wherein the fusion part is formed by inserting a hot needle into a sheet laminate in which a plurality of sheets are stacked.
PCT/JP2011/076511 2010-11-22 2011-11-17 Method for producing body with fused sheets, and body with fused sheets WO2012070462A1 (en)

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