CN106999319B - Method and apparatus for manufacturing fused sheet - Google Patents

Method and apparatus for manufacturing fused sheet Download PDF

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Publication number
CN106999319B
CN106999319B CN201580066552.5A CN201580066552A CN106999319B CN 106999319 B CN106999319 B CN 106999319B CN 201580066552 A CN201580066552 A CN 201580066552A CN 106999319 B CN106999319 B CN 106999319B
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CN
China
Prior art keywords
sheet
manufacturing
support member
fused
sheet laminate
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CN201580066552.5A
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Chinese (zh)
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CN106999319A (en
Inventor
梁岛拓郎
浜本伸二
山田邦利
岩崎淳
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Kao Corp
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Kao Corp
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    • 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
    • B29C66/80—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
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
    • 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
    • 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
    • B23K26/16—Removal of by-products, e.g. particles or vapours produced during treatment of a 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
    • B23K26/20—Bonding
    • B23K26/21—Bonding by 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
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • 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
    • 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
    • B29C65/1661—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning repeatedly, e.g. quasi-simultaneous laser 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
    • 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
    • B29C65/74—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
    • 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
    • B29C65/7858—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 characterised by the feeding movement of the parts to be joined
    • B29C65/7879—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 characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path
    • B29C65/7882—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 characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path said parts to be joined moving in a circular path
    • B29C65/7885—Rotary turret joining machines, i.e. having several joining tools moving around an axis
    • 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
    • B29C66/002—Removing toxic gases
    • 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
    • B29C66/40—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
    • B29C66/72941—Non woven mats, e.g. felt coated
    • 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
    • B29C66/80—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
    • B29C66/8145—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B29C66/81465—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 constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed behind the other in a single row in the feed direction
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • 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
    • B29C66/80—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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8324—Joining or pressing tools pivoting around one axis
    • 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
    • B29C66/80—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
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • 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
    • B29C66/80—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
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83417—Roller, cylinder or drum types said rollers, cylinders or drums being hollow
    • 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
    • B29C65/1603—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
    • 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
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    • 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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8226—Cam mechanisms; Wedges; Eccentric mechanisms
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8246—Servomechanisms, e.g. servomotors
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Textile Engineering (AREA)
  • Biomedical Technology (AREA)
  • Epidemiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The present invention provides a method for manufacturing an sheet welded body, which includes the following steps: a pre-irradiation holding step of disposing a band-shaped sheet laminate in which sheets are stacked on an outer surface of a support member (21) having a light passage section (27) through which laser light can pass and holding the sheet laminate in a pressurized state; a laser irradiation step of irradiating a predetermined region, which is formed by the sealing edge portion of the sheet laminate held in a pressurized state on the support member (21), with laser light from the support member (23) side via the light passage portion (27), thereby fusing the tape-shaped sheet laminate and simultaneously welding the cutting edge portions of the plurality of sheets in the pressurized state generated by the fusing to form the sealing edge portion; and a cutting unit insertion step of inserting a cutting unit (71a) in the thickness direction of the sheet laminate in a predetermined region of the seal edge portion irradiated with the laser beam.

Description

Method and apparatus for manufacturing fused sheet
Technical Field
The present invention relates to a method and an apparatus for manufacturing a fused sheet.
Background
In the production process of absorbent articles such as disposable diapers and sanitary napkins, heat roller devices have been widely used for joining superposed sheets to each other. As another joining method, a method of welding using a laser beam is also known. For example, patent document 1 describes a method in which a band-shaped sheet laminate in which a plurality of sheets are stacked is arranged on an outer surface of a support member having a light passage portion and conveyed, and the band-shaped sheet laminate is irradiated with a laser beam from an inner surface side of the support member via the light passage portion to divide the sheet laminate and weld cut edge portions of the plurality of sheets to each other.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-168904
Disclosure of Invention
The present invention relates to a method for manufacturing a sheet welded body having a sealing edge portion formed by welding edge portions of a plurality of sheets in an overlapped state. The manufacturing method of the present invention includes the following steps: a pre-irradiation holding step of disposing a band-shaped sheet laminate, which is formed by stacking a plurality of sheets, on an outer surface of a support member having a light-transmitting portion through which laser light can pass and traveling in a predetermined direction, and holding the sheet laminate on the outer surface in a pressurized state; a laser irradiation step of forming a predetermined region in a seal edge portion of the band-shaped sheet laminate held on the outer surface of the support member in the pressurized state, and irradiating laser light from the support member side through the light passing portion to fuse the band-shaped sheet laminate and weld cut edge portions of the plurality of sheets in the pressurized state generated by the fusion to form the seal edge portion; and a cutting unit insertion step of forming a predetermined region in the seal edge portion of the sheet laminate irradiated with the laser beam after the laser irradiation step, and inserting a cutting unit so as to cross the thickness direction of the sheet laminate.
The present invention also relates to an apparatus for manufacturing a sheet welded body, in which a plurality of sheet welded bodies having a sealing edge portion are continuously manufactured by irradiating a belt-shaped sheet laminate in which a plurality of sheets are stacked with a laser beam to fuse the sheet laminate, and welding cut edge portions of the plurality of sheets generated by the fusing to each other to form the sealing edge portion. The manufacturing device of the fusion-spliced body of the invention comprises: a support member that travels in a predetermined direction with the band-shaped sheet stacked body disposed on an outer surface thereof and has a light passage portion through which laser light can pass; an irradiation head which is disposed on the inner surface side of the support member and irradiates the laser beam onto a predetermined region formed at the sealing edge portion of the sheet laminate through the light passage portion; and a cutting unit insertion portion including a cutting unit that is inserted into a predetermined region of the seal edge portion irradiated with the laser beam so as to cross the thickness direction of the sheet laminate.
Drawings
Fig. 1 is a perspective view schematically showing a pants-type disposable diaper as an example of a sheet welded body manufactured according to the present invention;
FIG. 2 is a sectional view schematically showing a section taken along line I-I of FIG. 1;
FIG. 3 is a plan view schematically showing the diaper shown in FIG. 1 in an unfolded and stretched state;
FIG. 4 is a perspective view schematically showing a step of manufacturing a diaper continuous body in the manufacture of the diaper shown in FIG. 1;
fig. 5 is a perspective view schematically showing a laser type joining apparatus of a manufacturing apparatus of a pants-type disposable diaper as one embodiment of the manufacturing apparatus of a fused-sheet-joined body of the present invention;
fig. 6 is a perspective view schematically showing a pressing head of the laser type joining device of the pants-type disposable diaper shown in fig. 5;
FIG. 7(a) is a sectional view taken along line a-a of FIG. 6, and FIG. 7(b) is a sectional view taken along line b-b of FIG. 6;
fig. 8 is a sectional view schematically showing a structure of a section through a rotary shaft of a support member in the laser type joining apparatus shown in fig. 5;
fig. 9 is a schematic view showing a state of a swing motion (contact and separation action) of the pressing member rotating along the circumferential surface of the support member;
fig. 10(a) to (c) are schematic views sequentially showing states until the pressing head in the swing process state becomes a pressed state;
FIGS. 11(a) to (c) are explanatory views each illustrating a case where a side seal portion (seal edge portion) is formed while a diaper continuous body (belt-like exterior body) is fused by using the laser type joining apparatus shown in FIG. 5;
fig. 12(a) to (b) are perspective views schematically showing an apparatus for manufacturing a pants-type disposable diaper as one embodiment (embodiment a) of an apparatus for manufacturing a fused-sheet-joined body of the present invention;
fig. 13(a) to (B) are perspective views schematically showing an apparatus for manufacturing a pants-type disposable diaper according to another embodiment (embodiment B) of the apparatus for manufacturing a fused-sheet-joined body of the present invention.
Detailed Description
In the manufacturing method described in patent document 1, when splicing a belt-like sheet laminate being conveyed, the following operations are performed: the end portion of the tape-shaped sheet laminate being processed and the start end portion of a new tape-shaped sheet laminate are superposed on each other and the new tape-shaped sheet laminate is supplied to the processing line in a state where the new tape-shaped sheet laminate is joined with a double-sided tape or the like.
In addition, when the phase of the belt-shaped sheet laminate is shifted from the predetermined position of laser irradiation in the manufacturing line or the line speed is changed, the fusion by laser irradiation cannot be performed. Further, even when a failure occurs in the laser irradiation head or the optical control device, the fuse cannot be fused by the laser irradiation.
In this way, the portion to be fused is not fused, and when the connected ribbon-like sheet laminate is transferred to a subsequent step, the operation of the step becomes difficult.
Accordingly, an object of the present invention is to provide a method and an apparatus for manufacturing a fused-sheet bonded body, which can eliminate the above-described drawbacks of the conventional techniques.
The present invention will be described below based on preferred embodiments thereof with reference to the accompanying drawings. In the following embodiments, the present invention will be described by taking, as an example, a pants-type disposable diaper including an outer package having a pair of side seals, as a sheet welded body as an object to be manufactured of the present invention, that is, a sheet welded body having sealed edges formed by welding edge portions of a plurality of sheets in an overlapped state.
A pants-type disposable diaper 1 manufactured according to the present invention is illustrated in fig. 1 to 3. The diaper 1 includes an absorbent main body 2 and an outer cover 3 forming an outer surface of the diaper 1, and left and right side edge portions a1, a1 in the longitudinal direction X of the outer cover 3 in a front body portion F (a front side portion 1A) and left and right side edge portions B1, B1 in the longitudinal direction X of the outer cover 3 in a rear body portion R (a back side portion 1B) are joined to form a pair of side seals 4, a waist opening 8, and a pair of leg openings 9, 9. The outer package 3 is positioned on the non-skin contact surface side of the absorbent main body 2, and fixes the absorbent main body 2.
The diaper 1 has a longitudinal direction X corresponding to the front-back direction of the wearer and a transverse direction Y orthogonal to the longitudinal direction X in a plan view in an unfolded and stretched state as shown in fig. 3. The diaper 1 can be divided into a crotch portion 1C disposed in the crotch portion when worn, and a front side portion 1A and a back side portion 1B positioned in front of and behind the crotch portion in the longitudinal direction X. The outer package 3 in the crotch portion 1C has recessed portions for forming the leg openings 9, 9 formed in both left and right side edges in the longitudinal direction X. As shown in fig. 3, the diaper 1 can be divided into a front body portion F and a rear body portion R, with an imaginary center line CL dividing the diaper 1 into two in the longitudinal direction X as a boundary.
In the present specification, the skin contact surface is a surface of the pants-type disposable diaper 1 or a component thereof (e.g., an absorbent body) that faces the skin side of the wearer when worn, and the non-skin contact surface is a surface of the pants-type disposable diaper 1 or a component thereof that faces the opposite side (the clothing side) of the skin side of the wearer when worn. In the diaper 1, the longitudinal direction X coincides with the direction (longitudinal direction) along the long side of the disposable diaper or the absorbent body 2 as a constituent member thereof, and the lateral direction Y coincides with the width direction of the disposable diaper or the absorbent body 2 as a constituent member thereof.
As shown in fig. 3, the absorbent main body 2 has a relatively long and long shape in one direction (longitudinal direction X), and includes: a front sheet 2a forming a skin contact surface, a back sheet 2b forming a non-skin contact surface, and a liquid-retentive absorbent body 2c disposed between the sheets, the absorbent body 2c having a shape elongated in the same direction as the longitudinal direction X. The longitudinal direction of the absorbent main body 2 is aligned with the longitudinal direction X of the diaper 1 in an unfolded and stretched state, and is joined to the central portion of the outer package 3 by a known joining method (adhesive or the like). Here, the unfolded and stretched state refers to a state in which: the side seals are peeled off to put the diaper in an unfolded state, and the unfolded diaper is unfolded to a state where the elastic members of the respective portions are stretched to have a designed dimension (the same as a dimension when the diaper is unfolded in a flat state in a state where the influence of the elastic members is completely eliminated).
As shown in fig. 2 and 3, the exterior body 3 includes the following portions: an outer layer sheet 31 that forms the outer surface of the diaper 1 (the non-skin contact surface of the outer package 3); an inner layer sheet 32 disposed on the inner surface side of the outer layer sheet 31 and forming the inner surface of the diaper 1 (the skin contact surface of the outer package 3); and a plurality of linear or strip-shaped elastic members 5, 6, 7 fixed between the two sheets 31, 32 by an adhesive. The two sheets 31 and 32 are joined to each other at predetermined positions by an adhesive, heat sealing, or the like (not shown).
The outer package 3 (the outer layer sheet 31 and the inner layer sheet 32) contains a resin material at least in part and is formed mainly of the resin material. Examples of the outer package 3 (the outer layer sheet 31 and the inner layer sheet 32) include a nonwoven fabric, a film, a laminate of a nonwoven fabric and a film, and the like, each of which is made of a heat-fusible synthetic resin such as polyethylene, polyethylene terephthalate, or polypropylene as a resin material. Examples of the nonwoven fabric include a hot air nonwoven fabric, a hot roll nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, and a meltblown nonwoven fabric.
As shown in fig. 2, each of the pair of side seals 4, 4 of the diaper 1 has a seal edge 41, and the seal edge 41 is formed by joining the edge of the outer package 3 in the front body F and the edge of the outer package 3 in the rear body R by a continuous linear fusion-bonded portion 40 extending in the longitudinal direction of the side seal 4. The seal edge 41 in the diaper 1 is continuously formed over the entire length between the waist opening 8 and the leg openings 9 in each of the side seals 4, 4. The welded portion 40 in the sealing edge portion 41 is formed by melting and solidifying the constituent resins of a plurality of sheets (the outer layer sheet 31 and the inner layer sheet 32) constituting the outer package 3 in a state where the edges of these sheets are overlapped.
The pants-type disposable diaper 1 having the above-described structure can be manufactured by a method using, for example, an apparatus described below. The method for manufacturing the diaper 1 includes the steps of: a pre-irradiation holding step of disposing a belt-shaped laminated sheet body formed by laminating a plurality of sheets, that is, a belt-shaped exterior body 3 in a state in which a front body side and a rear body side are overlapped on an outer surface of a support member 21 having a light transmitting portion 27 through which laser light can pass and traveling in a predetermined direction, and holding the laminated sheet body on the outer surface in a pressurized state; a laser irradiation step of irradiating a predetermined region (a predetermined site for forming a side seal) formed at a seal edge portion of a band-shaped sheet laminate held in a pressurized state on the outer surface of the support member 21 with laser light from the support member 21 side via the light passage portion 27 to fuse the band-shaped sheet laminate (the exterior body 3) and weld cut edge portions of a plurality of sheets in a pressurized state (cut edge portions of the exterior body 3 in a laminated state) generated by the fusion welding to form a seal edge portion (a side seal portion 4); and a cutting unit insertion step of inserting the cutting unit 71a so as to cross the thickness direction of the sheet laminate after the laser irradiation step, in a predetermined region formed at the seal edge portion of the sheet laminate (outer package 3) irradiated with the laser. Further, before the holding step before irradiation, a body fixing step of fixing the absorbent body 2 manufactured in a separate step to the belt-like outer package 3 (the outer layer sheet 31, the inner layer sheet 32) is included.
More specifically, in the method of manufacturing the diaper 1, as shown in fig. 4, the belt-shaped outer cover 3 (the outer layer sheet 31 and the inner layer sheet 32) is folded in the width direction thereof, and the front body side and the back body side of the belt-shaped outer cover 3 to which the absorbent body 2 is fixed are superposed, whereby the "diaper continuous body 10 in which the precursors of the pants-type disposable diapers without the side seals are connected in one direction" is manufactured. Then, in the pre-irradiation holding step, the belt-like outer package 3 of the stacked diaper continuous body 10 is held in a pressurized state. In the laser irradiation step, the tape-shaped outer cover 3 of the diaper continuous body 10 is fused into a single piece by irradiation with the laser beam 30 using the apparatus shown in fig. 5, and the cut edge portions of the outer cover 3 (outer layer sheet 31, inner layer sheet 32) of the plurality of sheets in a laminated state resulting from the fusion are welded to each other, thereby continuously producing a pants-type disposable diaper 1 including the outer cover 3 having the pair of side seals 4, 4.
To describe in more detail, first, as shown in fig. 4, a plurality of waist elastic members 5 forming waist gathers, waist elastic members 6 forming waist gathers, and leg elastic members 7 forming leg gathers are arranged in a stretched state after being stretched at a predetermined stretching ratio between a belt-shaped outer sheet 31 continuously fed from a stock roll (not shown) and a belt-shaped inner sheet 32 continuously fed from a stock roll (not shown). At this time, the leg elastic members 7 are arranged while forming a predetermined leg circumference pattern via a known swing guide (not shown) that reciprocates perpendicularly to the sheet traveling direction. Before the belt-shaped outer layer sheet 31 and the belt-shaped inner layer sheet 32 are superposed on each other, a hot-melt adhesive is applied to a predetermined portion of the facing surface of either or both of the two sheets 31 and 32 by an adhesive applicator (not shown). In the case where the elastic members such as the waist elastic member 5 and the waistline elastic member 6 are disposed in a stretched state so as to straddle the portion of the two sheets 31 and 32 which is fused by laser irradiation (the portion to be formed of the side seal 4, and the portion to be formed of the seal edge portion shown by the reference numeral 10C in fig. 11 described later), in order to avoid troubles such as large contraction of the elastic members after the fusion and detachment of the elastic members, it is preferable to apply an adhesive in advance to the portion and the vicinity thereof. Before the waist elastic member 5 and the waistline elastic member 6 are disposed between the two sheets 31, 32, a hot-melt adhesive may be applied to the waist elastic member 5 and the waistline elastic member 6 at intervals by an adhesive applicator (not shown).
As shown in fig. 4, the belt-shaped outer sheet 31 and the belt-shaped inner sheet 32, which sandwich the waist elastic member 5, the waistline elastic member 6, and the leg elastic members 7 in a stretched state, are fed between the pair of nip rollers 11, 11 and pressed, whereby the belt-shaped exterior body 3 is formed in which the plurality of elastic members 5, 6, 7 are disposed in a stretched state between the belt-shaped sheets 31, 32. In the step of forming the outer package 3, a plurality of joint portions (not shown) for joining the belt-shaped outer layer sheet 31 and the belt-shaped inner layer sheet 32 are formed between the 2 adjacent waist elastic members 6, 6 by using joining means such as the spur roller 12 and the anvil roller 13 corresponding thereto.
Thereafter, the plurality of waist elastic members 6 and the plurality of leg elastic members 7 are pressed and cut into a plurality of pieces so as not to exhibit a contracting function, as necessary, using an elastic member precutting unit (not shown) in accordance with the position where the absorbent body 2 described later is disposed. Examples of the elastic member precutting means include an elastic member dividing section used in the method for manufacturing a composite stretchable member described in japanese patent application laid-open No. 2002-253605.
Next, as shown in fig. 4, the absorbent body 2 produced in the separate step is rotated by 90 degrees, and is supplied intermittently to the inner layer sheet 32 constituting the belt-like outer covering 3 to which an adhesive such as a hot-melt adhesive is applied in advance, and fixed (body fixing step). As shown in fig. 4, a leg hole LO' is formed inside the annular portion annularly surrounded by the leg elastic members 7 in the belt-like outer package 3 in which the absorbent body 2 is disposed. The leg hole forming step can be performed by a method similar to that in the conventional method for manufacturing such an article, such as a rotary cutter or a laser beam.
Next, the belt-shaped exterior body 3 is folded in the width direction thereof (direction orthogonal to the conveying direction of the exterior body 3). More specifically, as shown in fig. 4, both side portions 3a, 3a of the belt-like outer package 3 in the conveyance direction are folded back so as to cover both longitudinal end portions of the absorbent main body 2, both longitudinal end portions of the absorbent main body 2 are fixed, and then the outer package 3 is folded in two in the width direction together with the absorbent main body 2. Thus, a diaper continuous body 10 is obtained.
Next, as shown in fig. 5, the thus-produced diaper continuous body 10 is irradiated with a laser beam using a laser bonding apparatus 20 to form a pair of side seals 4, 4 (laser irradiation step), and a pants-type disposable diaper 1 including an outer covering 3 having the pair of side seals 4 is continuously produced.
Describing the laser type bonding apparatus 20, as shown in fig. 5, the laser type bonding apparatus 20 includes: a support member 21 having a light transmitting portion 27 that travels in a predetermined direction in a state where a belt-shaped sheet laminate in which a plurality of sheets are stacked, which is a diaper continuous body 10, is disposed on an outer surface thereof and through which laser light can pass; and an irradiation head 35 disposed on the inner surface side of the support member 21, and irradiating the predetermined region for forming the seal edge portion (the predetermined region for forming the side seal portion) of the diaper continuous body 10 with the laser beam through the light passage portion 27. Specifically, in the laser joining apparatus 20, a hollow cylindrical roller 23 is formed as a cylinder rotatably driven in the arrow D direction. The laser beam irradiation apparatus further includes an irradiation head 35 disposed in the hollow portion of the cylindrical roller 23 and configured to irradiate the laser beam 30 onto the cylindrical support member 21 forming the circumferential surface portion of the cylindrical roller 23. The irradiation head 35 has a lens for condensing the laser beam 30. The support member 21 formed in a cylindrical shape has a first surface 21a facing outward and a second surface 21b facing inward. The irradiation head 35 is disposed on the second surface 21b side of the support member 21.
As described above, the support member 21 forms the circumferential surface portion of the cylindrical roller 23 (the contact portion with the workpiece), and is sandwiched and fixed between a pair of annular frames (not shown) forming both end portions of the cylindrical roller 23 in the rotational axis direction. The support member 21 includes a metal material such as iron, aluminum, stainless steel, or copper, or a material having heat resistance such as ceramic.
The support member 21 has a light passage portion 27 through which laser light can pass. As shown in fig. 5, the support member 21 has a slit-shaped opening 27 penetrating the support member 21 in the thickness direction as a light passage portion. The openings 27 have a rectangular shape in plan view, and the longitudinal direction thereof extends in a direction intersecting the conveyance direction D of the diaper continuous body 10 (belt-like outer package 3), more specifically, in a direction parallel to the axial direction of the rotation axis of the cylindrical roller 23, and a plurality of openings are provided at predetermined intervals in the circumferential direction (conveyance direction D) of the cylindrical support member 21. The support member 21 allows the laser beam to pass through the opening 27, but does not allow (transmit) the laser beam in a portion other than the opening 27. As a method of forming the opening 27 in the support member 21, the following method can be mentioned: method 1) the opening 27 is formed by etching, punching, laser processing, or the like in a predetermined portion of the support member 21 made of a single annular member having the same length as the circumferential length of the annular frame (not shown), and method 2) a plurality of curved rectangular members are used as the support member 21 instead of the single annular member, and the plurality of members are arranged at predetermined intervals in the circumferential direction of the frame between a pair of frames (not shown). The length of the opening 27 in the longitudinal direction with respect to the axial length direction of the rotation axis of the cylindrical roller 23 is formed longer than the length of the planned fused portion (side seal) of the diaper continuous body 10 supported by the support member 21.
As shown in fig. 5, the irradiation head 35 is an electrical scanner (a device having a mirror attached to a motor shaft) that can freely scan the laser beam 30, and includes: a mechanism for retracting the laser beam 30 in a direction parallel to the rotation axis of the cylindrical roller 23, a mechanism for moving the position (irradiation point) of the diaper continuous body 10 supported on the first surface 21a of the support member 21, at which the laser beam 30 is irradiated, in the circumferential direction of the cylindrical roller 23, a mechanism for fixing the spot diameter of the laser beam 30 on the circumferential surface of the cylindrical roller 23, and the like. With such a configuration, the laser irradiation mechanism can move the irradiation point of the laser beam 30 arbitrarily in both the circumferential direction of the cylindrical roller 23 and the direction orthogonal to the circumferential direction.
The laser bonding apparatus 20 includes a plurality of pressing heads 26 as pressing members in addition to the support member 21 and the irradiation head 35 described above. The pressing head 26 is for pressing the diaper continuous body 10 supported on the first surface 21a of the support member 21, and one pressing head 26 is provided for one opening 27. Each of the pressing heads 26 is disposed on the circumferential surface of the second cylindrical roller 25 having a rotation axis on an extension line along the rotation axis of the cylindrical roller 23 and disposed adjacent to the cylindrical roller 23. The second cylindrical roller 25 rotates in synchronization with the cylindrical roller 23. In fig. 5, each pressing head 26 is attached to the second cylindrical roll 25 which is a separate member from the cylindrical roll 23, but instead of this configuration, each pressing head 26 may be attached to the cylindrical roll 23.
By the second cylindrical roller 25 rotating in synchronization with the cylindrical roller 23, each pressing head 26 can rotate along the circumferential surface of the support member 21 in the same direction as the rotation direction of the support member 21 constituting the cylinder of the cylindrical roller 23 and at the same speed as the circumferential speed of the support member 21.
The pressing head 26 shown in fig. 6 to 8 has a longitudinal direction X1 and a width direction Y1 orthogonal thereto, and is formed in a longitudinal shape along the longitudinal direction X1. The pressurizing head 26 is configured in the following manner: the longitudinal direction X1 is orthogonal to the circumferential direction of the cylindrical support member 21, i.e., the conveyance direction of the diaper continuous body 10, and the width direction Y1 is oriented in the same direction as the circumferential direction of the cylindrical support member 21, i.e., the conveyance direction of the diaper continuous body 10. The pressing head 26 has a main body 50A and a pressing portion 50B. The main body 50A has a longitudinal direction X1 and a width direction Y1 perpendicular thereto, and includes a block elongated in the longitudinal direction X1. The body portion 50A has a front end portion 52a at one end and a rear end portion 52b at the other end in the longitudinal direction X1. The rear end portion 52b is connected to a connecting member 53. The body portion 50A has a body hollow portion 51 therein. The body hollow portion 51 has a circular cross-sectional shape, and the body hollow portion 51 extends in the longitudinal direction X1 of the body 50A. The body hollow portion 51 communicates with the connection member 53 at the rear end portion 52b of the body 50A. The connection member 53 is connected to a suction unit not shown.
The pressing portion 50B includes a pair of partial pressing members 54, 54 hanging from the lower surface of the body portion 50A. The local pressurizing member 54 is a vertically long plate extending in the longitudinal direction X1, and is formed integrally with the main body 50A. The partial pressure member 54 has a predetermined thickness in the width direction Y1, and the lower surface thereof is a pressure surface 54A. The pressing surface 54A is a flat surface. The partial pressure member 54 is used to partially press the diaper continuous body 10 (sheet laminate) supported on the first surface 21a of the support member 21 by the pressing surface 54A thereof.
The pair of partial pressurizing members 54 and 54 are arranged in parallel with each other in a non-contact state at a predetermined interval in the width direction Y1. Therefore, a space S is provided between the pair of partial pressurizing members 54, 54. The space S extends along the length direction X1 of the pressing head 26, and also extends along the longitudinal direction of the pressing head 26. The space S communicates with the body hollow portion 51 provided inside the body portion 50A. The space S is open at the lower end portions of the pair of partial pressurizing members 54, 54. This opening functions as an air suction port 55. As described above, since the space S communicates with the body hollow portion 51, the body hollow portion 51 communicates with the connection member 53, and the connection member 53 is connected to the suction unit (not shown), air is drawn into the interior of the pressurizing head 26 (the body hollow portion 51) through the air suction port 55 by the operation of the suction unit. Thus, the pressurizing head 26 includes an air suction portion having an air suction port 55. That is, the pressurizing head 26 has the following two functions at the same time: a function of pressing the diaper continuous body 10 supported on the first surface 21a of the support member 21; and a function of removing gas generated by irradiation of the laser light 30 by suction.
The width of the air suction port 55 (the length in the width direction Y1 in fig. 7 b) is larger than the width of the slit-shaped opening 27 of the support member 21 (the length in the circumferential direction of the support member 21). However, the width of the air suction port 55 may be equal to the width of the slit-shaped opening 27 or the width of the air suction port 55 may be smaller than the width of the slit-shaped opening 27. The length of the air suction opening 55 (length in the longitudinal direction X1 in fig. 7 a) may be larger than the length of the portion to be fused (side seal) of the diaper. On the premise of this, in the present embodiment, the length of the air suction port 55 is larger than the length of the slit-shaped opening 27 of the support member 21 (the length in the axial direction of the support member 21). Further, the pressurizing head 26 is configured to: the air suction port 55 formed in the pressure head 26 is in contact with the outer surface of the first surface 21a of the support member 21 so as to cover the entire slit-shaped opening 27 of the support member 21. That is, the air suction port 55 extends in the same direction as the extending direction of the slit-shaped opening 27 provided in the support member 21, and is disposed to face the slit-shaped opening 27.
As can be seen from the above, as shown in fig. 7, the pair of partial pressurizing members 54 is disposed adjacent to the air suction port 55 so that the pressurizing surface 54A extends in the same direction as the extending direction of the air suction port 55 at the position on the first surface 21a side of the support member 21 and the pressurizing surface 54A is positioned across the air suction port 55.
Fig. 8 shows the operation of the pressing head 26 having the above-described configuration. Fig. 8 is a diagram schematically showing a main part of a cross section of the laser type joining apparatus 20. This figure is a longitudinal sectional view through the cylindrical roller 23 and the rotation shaft of the support member 21. As shown in the drawing, the pressure head 26 has the support portion 24 of the hinge structure at the rear end portion 52b in the longitudinal direction X1, in other words, at one end in the direction in which the air suction port 55 provided in the pressure head 26 extends. The support portion 24 is attached to the second cylindrical roller 25. The pressing head 26 can swing in a plane passing through the rotation axis of the support member 21, for example, in the paper plane of fig. 8, with the support portion 24 as a fulcrum. As shown in fig. 8, the range of the oscillating motion of the pressing head 26 is as follows: the pressing surface 54A of the pressing head 26 is sufficiently separated from the peripheral surface of the support member 21, and ranges from a state in which the diaper continuous body 10 introduced into the peripheral surface of the support member 21 is not interfered (for example, in fig. 8, a state in which the pressing head 26 shown on the upper side is orthogonal to the peripheral surface of the support member 21) to a state in which the pressing surface 54A is parallel to the peripheral surface of the support member 21 (a state shown on the lower side in fig. 8). In this oscillation range, the pressing head 26 is oscillated while rotating along the circumferential surface of the support member 21, and the local pressing member 54 of the pressing head 26 repeats the contact and separation operation with respect to the first surface 21a of the support member 21 while rotating.
In order to oscillate the pressing head 26, a known mechanism may be appropriately used. For example, a cam mechanism, or a cylinder mechanism, or a servo motor may be used.
Instead of oscillating the pressing head 26, another motion may be performed to bring the partial pressing member 54 of the pressing head 26 into contact with and away from the first surface 21a of the support member 21 while the pressing head 26 rotates along the circumferential surface of the support member 21. For example, the pressing head 26 may be configured to be capable of reciprocating in the radial direction of the support member 21. Thus, while the pressing head 26 is rotating along the circumferential surface of the support member 21, the pressing head 26 reciprocates in the radial direction of the support member 21, and the pressing head 26 repeats the contact and separation operation with respect to the first surface 21a of the support member 21. The mechanism for reciprocating the pressure head 26 may be, for example, a cam mechanism, a cylinder mechanism, or a servomotor, as in the case of the mechanism for oscillating the pressure head.
Fig. 9 is a schematic diagram showing a state of the swinging motion (contact/separation operation) of each pressing head 26 rotating along the circumferential surface of the support member 21. In the figure, the diaper continuous body 10 supported by the first surface 21a of the support member 21 is fused into a single diaper 1 when it is detached from the support member 21, but for convenience of explanation, it is shown as a continuous body in the figure. The state 26 of each pressing head differs depending on the position of each of the first surfaces 21a of the support members 21. The state of the pressing head 26 is roughly divided into an open state a, a swing process state (pressing process state) B1, a pressing state C, and a swing process state (opening process state) B2 as viewed in the circumferential direction of the support member 21. Note that such an operation of the pressing head 26 is an example of the present invention, and it is needless to say that the pressing head 26 may perform an operation different from this operation to fuse the diaper continuous body 10.
The open state a roughly coincides with the following range: the diaper 1 as a product is spaced apart from the first surface 21a of the support member 21 by a distance up to a fan-shaped range where the diaper continuous body 10 as a processing object is supported by the first surface 21a of the support member 21. The pressurized state C is a range of the fan shape that is located on the opposite side of 180 degrees from the range of the open state a and has a center angle larger than that of the fan shape of the open state a. The oscillation process state occurs during the transition from the open state a to the pressurized state C (oscillation process state B1) and also during the transition from the pressurized state C to the open state a (oscillation process state B2) as viewed in the rotational direction of the support member 21.
The open state a is a state shown on the upper side in fig. 8 described above, and is a fully open state in which the pressing surface 54A of the pressing head 26 is sufficiently separated from the circumferential surface of the support member 21. By setting the state in which the diaper 1 as a product is spaced apart from the support member 21 and is in the open state a until the diaper continuous body 10 as a processing target is supported on the first surface 21a of the support member 21, the diaper 1 as a product can be easily taken out. Further, the diaper continuous body 10 to be processed can be easily introduced to the first surface 21a of the support member 21.
The pressing state C is a state shown in the lower side in fig. 8, and is a state in which the pressing surface 54A of the pressing head 26 is parallel to the circumferential surface of the support member 21. In this state, the diaper continuous body 10 supported on the first surface 21a of the support member 21 is reliably pressed by the pressing head 26, and is melted by the laser beam 30 in this pressed state, so that the subsequent welding can be smoothly performed.
In the swing process state B1, the swing of the pressing head 26 in the open state is started, and the pressing surface 54A of the pressing head 26 approaches the first surface 21a of the support member 21. On the other hand, in the swing process state B2, the swing of the pressing head 26 in the pressing state is started, and the pressing surface 54A of the pressing head 26 is separated from the first surface 21a of the support member 21.
As described above, in the present embodiment, when focusing attention on one pressing head 26, the movement of the open state a → the swing process state B1 in which pressing is intended → the pressing state C → the swing process state B2 in which pressing is intended is performed as the movement of 1 cycle while the pressing head 26 performs 1 rotation movement along the circumferential surface of the support member 21.
Fig. 10(a) to (C) show the state of the pressing head 26 in the swing process state B1 to the pressing state C in this order. Fig. 10(a) shows a state in which the pressing head 26 is about to be in the pressing state C. In this state, the partial pressure members 54 of the pressure head 26 do not abut on the diaper continuous body 10 supported by the first surface 21a of the support member 21. In the enlarged view shown in the dotted circle in fig. 10(a), the continuous diaper 10 is not shown for convenience of explanation.
When the swinging motion is performed from the state shown in fig. 10(a), the pressing head 26 abuts against the diaper continuous body 10 as shown in fig. 10 (b). In this case, the diaper continuous body 10 is pressed by the pressing surface 54A at the tip of the pair of partial pressing members 54, 54 of the pressing member 26 across the opening 27. That is, the diaper continuous body 10 supported on the first surface 21a of the support member 21 is locally pressed by the local pressing member 54 at positions on both sides across the opening 27. By applying the partial pressure only at this position, the plurality of sheets constituting the diaper continuous body 10 in the diaper continuous body 10 positioned at the pair of partial pressure members 54 are reliably brought into close contact with each other. In the close contact state by the local pressurization, the laser beam 30 is irradiated to the diaper continuous body 10. Then, as shown in fig. 10c, the gas generated by the irradiation with the laser beam 30 is sucked and removed by an air suction portion provided in the pressure head 26 through an air suction port 55 (see fig. 7 and the like).
As described above, in the present embodiment, the air suction portion disposed on the first surface 21a side of the support member 21 supporting the continuous diaper body 10 sucks the gas generated when the continuous diaper body 10 is processed by the irradiation of the laser beam 30, and therefore, the gas can be efficiently sucked. Therefore, ignition and the like due to resin smoke and the like contained in the gas can be effectively prevented. Further, since the generated fumes can be favorably prevented from adhering to and accumulating on the support member 21 or the pressing surface 54A of the pressing head 26, it is possible to effectively prevent generation of defective products due to transfer of the accumulated substances to products.
In the present embodiment, since the diaper continuous body 10 is locally pressurized only at the positions on both sides across the slit-shaped opening 27 and the laser beam 30 is irradiated in this locally pressurized state, the sheets constituting the diaper continuous body 10 can be reliably welded to each other, and the welded portion 40 (see fig. 2) having sufficient strength can be formed.
As described above, in the present embodiment, the diaper continuous body 10 is continuously conveyed, one surface of the diaper continuous body 10 is disposed on the first surface 21a of the supporting member 21 which forms the peripheral surface portion of the cylindrical roll 23 and has the slit-like opening 27 (light passing portion) through which the laser light 30 can pass, and the diaper continuous body 10 is held in a pressurized state by the supporting member 21 and the pressurizing head 26 (holding step before irradiation). Then, a predetermined region (a predetermined portion for forming the side seal 4) is irradiated with a laser beam 30 from the second surface 21b side of the support member 21 to the seal edge portion of the diaper continuous body 10 in a pressurized state through the opening 27, so that the diaper continuous body 10 is fused and the cut edge portions of the plurality of sheets (the outer package 3) in the pressurized state generated by the fusion are welded in a state of being overlapped with each other, thereby forming the side seal 4 (laser irradiation step).
Fig. 11(a) to (c) are views for explaining the case where the side seal portions 4 (seal edges) are formed while the diaper continuous body 10 (belt-like sheet laminate) is fused by using the laser type joining apparatus 20. Fig. 11(a) schematically shows a seal edge formation scheduled region of the diaper continuous body 10, that is, a seal edge formation scheduled portion 10C and its vicinity. The seal edge formation scheduled portion 10C of the diaper continuous body 10 in the illustrated embodiment is the center in the longitudinal direction (conveyance direction D) in the region where the absorbent bodies 2 are not arranged in the diaper continuous body 10. The seal edge portion forms an 8-layer structure portion in which 8 sheets are overlapped with each other at the opening end portion of the waist opening 8 (see fig. 1) of the predetermined portion 10C and the vicinity thereof, and the other portion is a 4-layer structure portion in which 4 sheets are overlapped with each other. As shown in fig. 11A, the 4-layer structural portion includes 2 sheets (outer layer sheet 31 and inner layer sheet 32) constituting 1 outer package 3 in the front side portion 1A and the same 2 sheets 31 and 32 constituting 1 outer package 3 in the back side portion 1B, and the 4 sheets are laminated. On the other hand, in the 8-layer structural portion, since the both side portions 3a, 3a of the belt-like outer covering 3 are folded back so as to cover both longitudinal end portions of the absorbent main body 2 when the diaper continuous body 10 is manufactured as described above (see fig. 3 and 4), 2 outer coverings 3 are present in each of the front side portion 1A and the back side portion 1B and 4 outer coverings 3, 3 in total are laminated, and as a result, 8 sheets 31, 32 are laminated to constitute the 8-layer structural portion. In addition, in each of the 4-layer structure portion and the 8-layer structure portion, elastic members such as the waist elastic member 5 and the waistline elastic member 6 may be disposed between the overlapped sheets 31 and 32, but in fig. 4 described above, the elastic members are not shown from the viewpoint of easy description. Hereinafter, the 4-layer structure portion will be mainly described, but unless otherwise specified, the 8-layer structure portion is also configured in the same manner as the 4-layer structure portion to form the side seal portion 4.
As described above, the "region to be sealed edge portion formation" is defined as a region including the part to be sealed edge portion formation 10C and the vicinity thereof, and specifically, means a range of 10mm in each of the front and rear in the transport direction of the diaper continuous body 10 (belt-shaped sheet laminate) with the part to be sealed edge portion formation 10C as the center.
The predetermined portion 10C is formed at the seal edge portion of the 4-layer structure of the diaper continuous body 10, and either or both of the outer layer sheet 31 constituting one surface of the diaper continuous body 10, that is, the surface that is in contact with the support member 21, and the sheet (inner layer sheet 32) other than the sheet constituting the one surface are sheets that generate heat after absorbing the laser beam 30. In the illustrated embodiment, all of the 4 sheets 31 and 32 constituting the planned sealing edge portion formation portion 10C are sheets (nonwoven fabrics) that generate heat after absorbing the laser beam 30. The 2 pieces of the outer layer sheet 31 and the inner layer sheet 32 overlapped with each other at the seal edge portion formation planned portion 10C and the vicinity thereof may be joined with an adhesive or the like before the laser beam 30 is irradiated, or may not be joined at all.
As shown in fig. 11 b, the diaper continuous body 10 is introduced into the supporting member 21 rotating in the direction of the arrow D so that one surface 10a abuts against the supporting member 21 and the seal edge portion formation scheduled portion 10C (the scheduled formation portion of the side seal 4) is positioned above the slit-shaped opening 27, and is conveyed in the direction of the arrow D and pressed (compressed) in the thickness direction by the local pressing member 54 of the pressing head 26 while being pressed against the other surface 10b (pre-irradiation holding step). Then, the sealing edge formation planned region in the conveyed and pressurized state is irradiated with the laser beam 30 from the support member 21 side through the opening 27 (laser irradiation step). As described above, the irradiation point of the laser beam 30 is configured to be freely movable in the circumferential direction of the cylindrical roll 23 and to be set to move following the movement of the opening 27 in the circumferential direction, and therefore, the predetermined portion 10C is formed at the sealing edge portion positioned on the opening 27, and the laser beam 30 is continuously irradiated for a certain period of time during the conveyance thereof.
When the sealing edge formation planned portion 10C having the 4-layer structure is irradiated with the laser beam 30, the forming material (fibers or the like) of the sheets 31 and 32 present in the sealing edge formation planned portion 10C is vaporized and disappeared by heat generation due to the direct irradiation of the laser beam 30, and the forming material present in the vicinity of the sealing edge formation planned portion 10C is indirectly heated and melted by the laser beam 30. The vaporized gas is sucked into the pressurizing head 26 through the air suction port 55 of the pressurizing head 26 and discharged to the outside as described above.
As a result of melting the forming material present in the vicinity of the seal edge formation scheduled portion 10C, as shown in fig. 11(C), the seal edge formation scheduled region having the 4-layer structure is fused to cut out a single sheet laminate (diaper precursor) from the diaper continuous body 10, the diaper continuous body 10 is fused, and the cut edge portions of the 4 sheets 31 and 32 in the single sheet laminate generated by the fusing are fused to each other, and the cut edge portions of the 4 sheets 31 and 32 in the diaper continuous body 10 after being cut out are also fused to each other. These cut edge portions are sandwiched between the supporting member 21 and the pressing head 26 and brought into a pressed state (compressed state) from before the formation thereof (before the diaper continuous body 10 is fused by irradiation with the laser beam 30). According to the method for manufacturing a diaper of the illustrated embodiment, since the fusion of the tape-shaped outer package 3 and the welding of the cut edge portions of the two portions of the outer package 3 in a pressurized state by the fusion are simultaneously performed by the primary laser irradiation in this manner, the fusion and fusion can be performed in the same step with about half the laser output as compared with the method of welding the two portions of the fused portion by the secondary laser irradiation, and the diaper 1 can be efficiently manufactured.
The cut edge portions of the sheets 31 and 32 are heated and melted during and immediately after the irradiation with the laser beam 30, but the pressurized state of the supported member 21 and the pressurizing head 26 of each of the 1-piece diaper precursor cut out from the diaper continuous body 10 by the irradiation with the laser beam 30 and the diaper continuous body 10 is maintained, and the cut edge portions are rapidly cooled and solidified by the outside air after the irradiation is completed, and become the welded portions 40 formed by melting and integrating the forming material (fibers and the like) of the cut edge portions (post-irradiation holding step). By forming the welded portion 40 in this manner, one of the pair of side seals 4, 4 in one diaper 1 is formed. In the present embodiment, air is sucked from the opening 27 through the air suction port 55 of the pressurizing head 26, and therefore, the high-temperature mist gas is quickly removed by the suction, and therefore, there is an advantage that the time until the fused portion 40 is solidified can be shortened.
When the sealing edge formation planned region (planned formation region of the side seal 4) at one location is fused as described above, the laser beam 30 is moved so that its irradiation point reaches the other opening 27 adjacent in the direction opposite to the transport direction D, and is irradiated to the other sealing edge formation planned region 10C located above the other opening 27 through the other opening 27. Thus, the other sealing edge forming predetermined region is divided and welded in the same manner as described above, and the other side seal 4 (welded portion 40) which is paired with the previously formed side seal 4 is formed. Then, by repeating the same operation, a pants-type disposable diaper 1 including an outer package 3 having a pair of side seals 4, 4 is continuously manufactured.
The laser light is used as the laser light to be applied to the diaper continuous body 10 (belt-shaped outer sheet 3) at a wavelength that is absorbed by the sheets (outer layer sheet 31 and inner layer sheet 32) constituting the outer sheet 3 and then causes the sheets to generate heat. Here, the "sheet constituting the outer package" is not limited to a sheet constituting one surface (surface in contact with the support member 21) of the outer package (for example, the outer layer sheet 31 in the above-described embodiment), and may be any sheet as long as it constitutes the outer package. The wavelength of the laser light irradiated to the outer package is determined depending on the relationship between the material of the sheet and the wavelength of the laser light used, whether or not each sheet constituting the outer package is a wavelength at which the sheet generates heat after being absorbed by the sheet. When the sheet constituting the outer package is a synthetic resin nonwoven fabric or film widely used for the production of absorbent articles (sanitary products) such as disposable diapers and sanitary napkins, it is preferable to use CO as the laser beam2Laser, YAG laser, LD laser (semiconductor laser), YVO4Laser, fiber laser, etc. In the case where the sheet constituting the outer package contains polyethylene, polyethylene terephthalate, polypropylene or the like as a synthetic resin, the wavelength at which the sheet can generate heat well after being absorbed by the sheet is preferably, for example, 8.0 μm or more and 15.0 μm or less, and particularly preferably, CO in which a high-power laser device is present is used29.0 to 11.0 μm of the laser beamThe oscillation wavelength of (b). The spot diameter of the laser beam, the laser power, and the like can be appropriately selected in consideration of the material, thickness, and the like of the sheet constituting the outer package.
The method for manufacturing the diaper 1 (fused sheet) according to the present invention includes a cutting unit insertion step of inserting the cutting unit 71a so as to cross the laminated sheet body (outer package 3) in the thickness direction thereof, after the laser irradiation step, so as to form a predetermined region in the seal edge portion of the laminated sheet body irradiated with the laser. In detail, in the apparatus for manufacturing the diaper 1 (fused-sheet structure) of the present invention, as shown in fig. 12, a cutting unit insertion portion 70 including a cutting unit 71a is provided on the downstream side in the sheet conveyance direction of the laser joining apparatus 20, and the cutting unit 71a is inserted into the seal edge portion formed predetermined region after the laser irradiation so as to cross in the thickness direction of the sheet laminate. In the present embodiment, the cutting unit insertion portion 70 has a rotary die cutter 71 and an anvil roll 72. The rotary die cutter 71 includes a cutting blade 71a as cutting means, and the rotary die cutter 71 is rotated to insert the cutting blade 71a into the laser irradiated portion of the sheet laminate (exterior body 3) so as to cross the thickness direction of the sheet laminate.
A belt conveyor 60 is provided between the laser joining device 20 and the cutting unit insertion portion 70, and the belt conveyor 60 conveys and supplies the one-piece diaper precursor cut out from the diaper continuous body 10 by irradiation of the laser beam 30 to the cutting unit insertion portion 70. In general, when a predetermined region is formed at the sealing edge of the sheet stack in the laser bonding apparatus 20 and laser light is applied, the sheet stack in a band shape is fused. However, for example, in the case of splicing paper, fusing by laser irradiation may not be smoothly performed at the overlapping portion of the double-sided tape or the old sheet laminate and the new sheet laminate. Here, in the cutting unit insertion portion 70, a cutting unit is inserted so as to cross the thickness direction of the sheet laminate, so as to form a predetermined region in the seal edge portion of the sheet laminate irradiated with the laser beam. Thus, in the laser irradiation step, the sealing edge portion that has not been fused is reliably cut into the predetermined region, and the stacked sheet body that has been connected without being fused can be prevented from being transferred to the subsequent step.
In an embodiment a of the method for manufacturing the diaper 1 (fused sheet), the cutting unit is inserted into a predetermined region formed at all the sealed edges of the conveyed sheet laminate in the cutting unit insertion step. As shown in fig. 12(a), in the laser irradiation step, the diaper continuous body 10 is fused to form a single diaper precursor, but a cutting blade 71a is inserted so as to cross the diaper continuous body in the thickness direction so as to form a predetermined region between all the diaper precursors, that is, all the seal edges of the diaper continuous body. As shown in fig. 12(b), in the laser irradiation step, even if the region to be sealed at the edge portion is not fused or laser irradiation is not performed, the cutting blade 71a is inserted so as to cross the diaper continuous body in the thickness direction. In this way, in the cutting unit insertion step, the cutting unit is inserted into the planned region for forming the entire seal edge portion of the sheet stack being conveyed, whereby the planned region for forming the seal edge portion can be reliably divided.
The position of the insertion/cutting unit 71a does not necessarily need to be matched with the portion irradiated with the laser beam as long as it is within the predetermined region of the seal edge.
Next, fig. 13 shows another embodiment (embodiment B) of the method for producing the diaper 1 (fused-sheet bonded body). In embodiment B, there is a detection step of detecting whether or not the sealing edge portion formation scheduled region of the sheet laminate is fused in the laser irradiation step, and in the cutting unit insertion step, the cutting unit 71a is inserted into the sealing edge portion formation scheduled region in which the fusion failure is detected in the detection step. That is, the laser welding apparatus has a detection unit 80 for detecting whether or not a predetermined region of the seal edge portion of the laser-welded laminated sheet is fused. The detection section 80 includes: a sensor 81 for detecting the presence or absence of fusion in a predetermined region formed at the sealing edge of the sheet laminate fed to the support member; and a determination unit 82 that determines whether or not the fusion is good based on the detection result of the sensor 81, and inserts the cutting unit 71a into a region where a sealing edge portion determined to have a fusion failure is to be formed. As shown in fig. 13, the sensor 81 is provided at a position capable of detecting a predetermined region of the seal edge portion formed when the state of the pressure head 26 is in the swing process state (opening process state) B2, that is, when the pressure head 26 is away from the diaper continuous body 10. The rotary die cutter 71 is separable from the anvil roll 72 by a drive unit not shown. When the determination unit 82 determines that the fusion is good, the rotary die cutter 71 is moved away from the anvil roll 72 to a position where the cutter 71a cannot traverse in the thickness direction of the sheet stack (fig. 13 (a)). On the other hand, when the fusion failure is determined, the rotary die cutter 71 is positioned at a position where the cutting blade 71a can traverse in the thickness direction of the sheet stack (fig. 13 (b)). In embodiment B, since the cutting blade 71a is not inserted into the region where the sealing edge portion determined to be well fused is to be formed, that is, the region fused by the laser irradiation step, the predetermined region can be reliably formed and divided at the sealing edge portion, and the life of the cutting blade 71a can be increased.
In embodiment B described above, the rotary die cutter 71 is separable from the anvil roll 72, but the pressing force of the rotary die cutter 71 in the thickness direction of the sheet stack may be changed by determining whether the fusion is satisfactory or not without separating the rotary die cutter 71. Specifically, when it is determined that the fusion is good, the rotary die cutter 71 inserts the cutting blade 71a into the fused portion at a low pressurizing force, and does not apply an unnecessary force to the cutting blade 71 a. On the other hand, when the fusion failure is determined, the rotary die cutter 71 is switched to the high pressure, and the cutting blade 71a is inserted at the high pressure, whereby the predetermined area division is reliably formed at the seal edge portion by the pressing force of the cutting blade 71a against the anvil roller 72. As a result, as in embodiment B described above, the predetermined portion can be reliably formed at the seal edge and can be divided, and the life of the cutting blade 71a can be increased. The pressurizing force of the rotary die cutter 71 in the thickness direction of the sheet stack can be switched by an air cylinder.
In embodiment B, the position where the cutting unit 71a is inserted does not necessarily need to coincide with the position irradiated with the laser beam as long as the predetermined region is formed in the seal edge portion.
In the above-described embodiments a and B, the cutting unit insertion portion 70 has the cutting blade as the cutting unit 71a, but the cutting unit 71a may be a laser, and in the cutting unit insertion step, the laser irradiation portion of the sheet laminate is irradiated again with the laser so as to cross the thickness direction of the sheet laminate. By using a laser as the cutting unit 71a, the durability and maintainability of the device for non-contact processing are improved. As described above, if the image detection is performed by using the detection unit, only the portion with the fusion failure may be irradiated with the laser light, which has an effect of reducing the energy used.
The intensity of the laser beam is preferably higher than the intensity of the laser beam used in the laser irradiation step as the previous step, from the viewpoint of reliably dividing the sheet laminate into the predetermined regions at the seal edge.
The position where the laser beam is re-irradiated in the cutting unit insertion step does not necessarily need to coincide with the position where the laser beam is irradiated in the laser irradiation step, as long as the predetermined region is formed in the seal edge portion.
The present invention has been described above based on embodiments thereof, but the present invention is not limited to the above embodiments and can be modified as appropriate. For example, the tape-shaped exterior body (sheet laminate) may have a structure in which 2 sheets, 3 sheets, or 5 or more sheets are stacked, in addition to the structure in which 4 sheets are stacked as shown in fig. 11 (a).
The exterior body 3 of the above embodiment is not divided into the front side portion 1A and the back side portion 1B as shown in fig. 3, but has a continuous shape such as a hourglass shape extending over the front side portion 1A, the crotch portion 1C, and the back side portion 1B, but the exterior body to be processed according to the present invention is not limited to such a continuous shape, and may be divided into, for example, a front side sheet member disposed on the front side (front side) of the wearer and a back side sheet member disposed on the back side (rear side) of the wearer, and the absorbent main body is fixed by being stretched over these two sheet members. In the pre-irradiation holding step in the method for manufacturing a pants-type disposable diaper having such a divided outer cover, the formation planned site of the side seal in the belt-shaped outer cover having a structure in which the front body side (belt-shaped abdomen-side sheet member) and the back body side (belt-shaped back-side sheet member) of the belt-shaped outer cover to which the absorbent body is fixed are superposed is put in a pressurized state.
In the above embodiment, before the pre-irradiation holding step is performed, as shown in fig. 4, both side portions 3a, 3a in the conveyance direction of the belt-shaped exterior body 3, that is, both side portions in the conveyance direction of each of the belt-shaped outer layer sheet 31 and the belt-shaped inner layer sheet 32 are folded back so as to cover both longitudinal end portions of the absorbent main body 2, but a sheet having a length in the width direction (direction orthogonal to the longitudinal direction) larger than that of the belt-shaped inner layer sheet 32 may be used as the belt-shaped outer layer sheet 31, and when the two sheets 31, 32 are stacked, only the extended portion of the outer layer sheet 31 extending outward from the side edge of the inner layer sheet 32 is folded back so as to cover both longitudinal end portions of the absorbent main body 2. In this case, the seal edge portion of the diaper continuous body 10 forms the opening end portion of the waist opening 8 of the predetermined portion 10C and the vicinity thereof, and has a 6-layer structure portion in which 6 sheets are overlapped, and the other portion has a 4-layer structure portion in which 4 sheets are overlapped. Further, the both side portions 3a and 3a of the belt-shaped exterior body 3 in the conveyance direction, that is, the both side portions of the belt-shaped outer layer sheet 31 and the belt-shaped inner layer sheet 32 in the conveyance direction may not be folded.
In addition, in the above-described embodiment, the laser type joining apparatus 20 having the cylindrical roller 23 is used, but a member having a flat plate shape may be used instead of the laser type joining apparatus 20 having the cylindrical roller 23.
Further, the above embodiment relates to a pants-type disposable diaper as an example of the fused-sheet structure, but the present invention can be similarly applied to the production of other fused-sheet structures.
The embodiments of the present invention described above further describe the following remarks (a method and an apparatus for manufacturing a fused-sheet bonded body).
＜1＞
A method for manufacturing a sheet welded body having a sealing edge portion formed by welding edge portions of a plurality of sheets in an overlapped state, the method comprising:
a pre-irradiation holding step of disposing a band-shaped sheet laminate, which is formed by stacking a plurality of sheets, on an outer surface of a support member having a light passage section through which laser light can pass and traveling in a predetermined direction, and holding the sheet laminate on the outer surface in a pressurized state;
a laser irradiation step of forming a predetermined region in a seal edge portion of the band-shaped sheet laminate held on the outer surface of the support member in the pressurized state, and irradiating laser light from the support member side through the light passing portion to fuse the band-shaped sheet laminate and weld cut edge portions of the plurality of sheets in the pressurized state generated by the fusion to form the seal edge portion; and
and a cutting unit insertion step of forming a predetermined region in the seal edge portion of the sheet laminate irradiated with the laser beam after the laser irradiation step, and inserting a cutting unit so as to cross the thickness direction of the sheet laminate.
< 2 > the method for producing a sheet welded body according to the above < 1 >, wherein in the cutting unit insertion step, the cutting unit is inserted into a predetermined region formed at all the seal edges of the sheet stacked body to be conveyed.
< 3 > the method for manufacturing a sheet welded body according to the above < 1 >, comprising a step of detecting whether or not a predetermined region formed at a sealing edge portion of the sheet stacked body in the laser irradiation step is fused,
in the cutting unit insertion step, the cutting unit is inserted into a region in which a sealing edge portion formation failure is detected by the detection step.
< 4 > the method for producing a sheet welded body according to any one of the above < 1 > to < 3 >, wherein in the pre-irradiation holding step, the sheet stacked body is held in the pressed state by a pressing member that presses the outer surface of the support member from the surface opposite to the contact surface of the sheet stacked body.
< 5 > the method for producing a fused-sheet structure according to the above < 4 >, comprising: and a post-irradiation holding step of holding the sheet laminate on the outer surface of the support member while maintaining the pressurized state by the pressurizing member after the laser irradiation step.
< 6 > the method for producing a fused-sheet material according to any one of the above < 1 > to < 5 >, wherein the cutting means is a cutting knife.
< 7 > the method for manufacturing a sheet welded body according to any one of the above < 1 > to < 5 >, wherein the cutting unit is inserted in the cutting unit insertion step by irradiating the sheet laminated body with the laser again so that the seal edge portion of the sheet laminated body forms the predetermined region and crosses the thickness direction of the sheet laminated body.
< 8 > the method for manufacturing a welded body according to any one of the above < 1 > to < 5 >, wherein the cutting means is a cutting knife, and in the cutting means inserting step, the cutting knife is inserted so as to cross the laser irradiated portion of the sheet laminate in the thickness direction of the sheet laminate,
the method for manufacturing the sheet welded body comprises a detection step of detecting whether the sealing edge part of the sheet laminated body in the laser irradiation step is formed with the predetermined region and is fused or not,
the pressure of the cutting blade in the thickness direction of the sheet stacked body may be changed, and the cutting blade may be inserted into the region where the sealing edge formation is planned, where the detection step detects good fusion, at a low pressure, and the cutting blade may be inserted into the region where the sealing edge formation is planned, where the detection step detects poor fusion, at a high pressure.
< 9 > a method for producing a pants-type disposable diaper having an outer package body with a pair of side seals, the method comprising any one of the above-described production methods < 1 > to < 8 > and being used for producing a pants-type disposable diaper having a sheet welded body with sealed edge portions formed by welding edge portions of a plurality of sheets in an overlapped state.
< 10 > the method of producing a pants-type disposable diaper according to the above < 9 > comprising an absorbent main body and an outer covering body forming an outer surface of the diaper, wherein a pair of side seals, a waist opening and a pair of leg openings are formed by joining left and right side edge portions in a longitudinal direction of the outer covering body in a front body portion and left and right side edge portions in a longitudinal direction of the outer covering body in a back body portion, the outer covering body is positioned on a non-skin contact surface side of the absorbent main body to fix the absorbent main body, wherein in the before-irradiation holding step, the belt-like outer covering body is held in a pressurized state, and in the laser irradiation step, the side seals are formed.
< 11 > an apparatus for manufacturing a sheet welded body, which continuously manufactures a plurality of sheet welded bodies having a seal edge portion by fusing a band-shaped sheet stacked body formed by stacking a plurality of sheets by irradiating laser light to the sheet stacked body, and welding cut edge portions of the plurality of sheets generated by the fusing to each other to form the seal edge portion, the apparatus comprising:
a support member having a light passage portion through which laser light can pass, the support member traveling in a predetermined direction with the band-shaped sheet stacked body disposed on an outer surface thereof;
an irradiation head which is disposed on the inner surface side of the support member and irradiates the laser beam onto a predetermined region formed at the sealing edge portion of the sheet laminate through the light passage portion; and
and a cutting unit insertion portion having a cutting unit that is inserted so as to cross the thickness direction of the sheet laminate and that forms a predetermined region in the seal edge portion irradiated with the laser beam.
< 12 > the apparatus for producing a fused-sheet structure according to the above < 11 >, wherein,
the cutting unit forms a predetermined region in all the sealing edges of the sheet stack that is inserted and conveyed.
< 13 > the apparatus for manufacturing a sheet welded body according to the above < 11 > comprising a detecting section for detecting whether or not a predetermined region of the sealed edge portion of the sheet stacked body is fused well by the laser beam, and the cutting unit is inserted into the predetermined region of the sealed edge portion determined to be fused poorly by the detecting section.
< 14 > the apparatus for producing a sheet-fused body according to any one of < 11 > to < 13 > comprising a pressing member for pressing the sheet-stacked body arranged on the outer surface of the support member from the side opposite to the support member,
the laminated sheet body is maintained in the pressurized state on the outer surface of the support member by the pressurizing member when the laminated sheet body is irradiated with the laser beam.
< 15 > the apparatus for manufacturing a fused-sheet material according to any one of the above < 11 > to < 14 >, wherein the cutting means is a cutting knife.
< 16 > the apparatus for producing a fused-sheet structure according to any one of the above < 11 > -14 >, wherein,
the cutting unit is inserted into the cutting unit insertion portion by irradiating the sheet laminate again with laser light so as to cross the thickness direction of the sheet laminate in a region where the seal edge portion of the sheet laminate is to be formed.
< 17 > the apparatus for producing a fused-sheet structure according to any one of the above < 11 > to < 15 >, wherein,
the cutting unit is a cutting blade, the cutting unit insertion portion inserts the cutting blade so as to form a predetermined region in the seal edge portion of the sheet laminate so as to cross the thickness direction of the sheet laminate,
the manufacturing apparatus includes a detection unit for detecting whether or not the fusing of a predetermined region formed at the sealing edge of the sheet laminate by the laser beam is satisfactory,
the pressure of the cutting blade in the thickness direction of the sheet stacked body may be changed, and the cutting blade may be inserted into the region where the sealing edge formation is planned, where the detection step detects good fusion, at a low pressure, and the cutting blade may be inserted into the region where the sealing edge formation is planned, where the detection step detects poor fusion, at a high pressure.
< 18 > the apparatus for producing a fused-sheet structure according to any one of the above < 14 > to < 17 >, wherein,
the pressurizing member has an air suction portion, and the air suction portion sucks and removes gas generated by fusion.
< 19 > the apparatus for manufacturing a fused sheet structure according to the above < 18 >, wherein the pressing member includes a local pressing member having a pressing surface for locally pressing the sheet stacked body supported on the outer surface of the support member,
the pair of partial pressurizing members are disposed such that the pressurizing surfaces are positioned across the air suction port.
< 20 > the apparatus for producing a fused-sheet structure according to any one of the above < 14 > to < 19 >, comprising a plurality of the above-mentioned pressing members.
< 21 > the apparatus for manufacturing a fused-sheet structure according to any one of the above < 11 > to < 20 >, comprising a hollow cylindrical roller which is rotatably driven, wherein the support member forms a peripheral surface portion of the cylindrical roller, the apparatus comprising the irradiation head which is disposed in the hollow portion of the cylindrical roller and irradiates a laser beam onto the cylindrical support member forming the peripheral surface portion of the cylindrical roller.
< 22 > the apparatus for producing a fused-sheet structure according to the above < 21 >, wherein,
the light passing portion is a slit-shaped opening penetrating the support member in the thickness direction, and the longitudinal direction thereof extends in a direction parallel to the axial length direction of the rotary shaft of the cylindrical roller.
< 23 > an apparatus for manufacturing a pants-type disposable diaper, which comprises the apparatus as defined in any one of the above < 11 > to < 22 > and is used for manufacturing the pants-type disposable diaper,
a pants-type disposable diaper includes an outer package having a pair of side seals, as a sheet welded body having seal edges formed by welding edge portions of a plurality of sheets in an overlapped state.
< 24 > the apparatus for producing a pants-type disposable diaper according to the above < 23 > comprising an absorbent main body and an outer covering body forming an outer surface of the diaper, wherein a pair of side seals, a waist opening and a pair of leg openings are formed by joining both left and right side edges in a longitudinal direction of the outer covering body in a front body portion and both left and right side edges in the longitudinal direction of the outer covering body in a back body portion, and the outer covering body is positioned on a non-skin contact surface side of the absorbent main body and fixes the absorbent main body.
< 25 > the apparatus for producing a pants-type disposable diaper according to the above < 23 > or < 24 >, wherein,
intermittently feeding and fixing the absorbent body manufactured in another step to an inner sheet constituting the belt-like outer package, and then forming leg holes in the outer package,
then, the belt-like outer package is folded in a direction orthogonal to the conveyance direction of the outer package to obtain a diaper continuous body,
next, the diaper continuous body is irradiated with a laser beam using a laser joining apparatus to form a pair of side seals, and a pants-type disposable diaper 1 including an outer package having the pair of side seals is continuously manufactured.
< 26 > the apparatus for manufacturing a pants-type disposable diaper according to any one of < 23 > to < 25 > above, wherein,
the both side portions of the belt-like outer package in the transport direction are folded back so as to cover the both end portions of the absorbent main body in the longitudinal direction, the both end portions of the absorbent main body in the longitudinal direction are fixed, and then the outer package is folded in two together with the absorbent main body in a direction orthogonal to the transport direction of the outer package.
Industrial applicability
According to the present invention, even if a fusion failure occurs by laser irradiation, the stacked sheet body which is not fused and remains in a connected state can be prevented from being transferred to a subsequent step.

Claims (22)

1. A method for manufacturing a sheet welded body having a sealing edge portion formed by welding edge portions of a plurality of sheets in an overlapped state, the method comprising:
a pre-irradiation holding step of disposing a band-shaped sheet laminate, which is formed by stacking a plurality of sheets, on an outer surface of a support member having a light passage section through which laser light can pass and traveling in a predetermined direction, and holding the sheet laminate on the outer surface in a pressurized state;
a laser irradiation step of forming a predetermined region in a seal edge portion of the band-shaped sheet laminate held on the outer surface of the support member in the pressurized state, and irradiating laser light from the support member side through the light passing portion to fuse the band-shaped sheet laminate and weld cut edge portions of the plurality of sheets in the pressurized state generated by the fusion to form the seal edge portion; and
a detection step of detecting whether or not a predetermined region formed at a sealing edge portion of the sheet laminate in the laser irradiation step is fused; and
a cutting unit insertion step of forming a predetermined region in the seal edge portion of the sheet laminate irradiated with the laser beam after the laser irradiation step, and inserting a cutting unit located on a downstream side in a sheet conveying direction of the light passage portion so as to cross in a thickness direction of the sheet laminate,
in the cutting unit insertion step, the cutting unit is inserted into a region in which a sealing edge portion formation failure is detected by the detection step.
2. The method of manufacturing a fused-sheet body according to claim 1, wherein:
in the pre-irradiation holding step, the sheet stacked body is held in the pressed state by a pressing member that presses the outer surface of the support member from a surface opposite to a contact surface of the sheet stacked body.
3. The method of manufacturing a fused-sheet body according to claim 2, comprising:
and a post-irradiation holding step of holding the sheet laminate on an outer surface of the support member while maintaining the pressurized state by the pressurizing member after the laser irradiation step.
4. The method for manufacturing a fused-sheet structure according to any one of claims 1 to 3, wherein:
the cutting unit is a cutting knife.
5. The method for manufacturing a fused-sheet structure according to any one of claims 1 to 3, wherein:
the cutting unit is inserted in the cutting unit insertion step by irradiating the sheet laminate again with laser light so as to form a predetermined region in the seal edge portion of the sheet laminate and cross the sheet laminate in the thickness direction.
6. The method for manufacturing a fused-sheet structure according to any one of claims 1 to 3, wherein:
wherein the cutting unit is a cutting blade, and the cutting unit insertion step inserts the cutting blade so that the laser-irradiated portion of the sheet laminate crosses the thickness direction of the sheet laminate,
the pressure force of the cutting blade in the thickness direction of the sheet laminate can be changed, and the cutting blade can be inserted into the region where the sealing edge formation is planned, where good fusing is detected in the detection step, at a low pressure force, and inserted into the region where the sealing edge formation is planned, where poor fusing is detected, at a high pressure force.
7. A method for manufacturing a pants-type disposable diaper, characterized in that:
the production method comprising the production method according to any one of claims 1 to 6, and used for producing a pants-type disposable diaper,
a pants-type disposable diaper includes an outer package having a pair of side seals, as a sheet welded body having seal edges formed by welding edge portions of a plurality of sheets in an overlapped state.
8. The method of manufacturing a pants-type disposable diaper according to claim 7, characterized in that:
the pants-type disposable diaper comprises an absorbent main body and an outer covering body forming the outer surface of the diaper, wherein the left and right side edges in the longitudinal direction of the outer covering body in the front body portion and the left and right side edges in the longitudinal direction of the outer covering body in the back body portion are joined to form a pair of side seals, a waist opening portion, and a pair of leg opening portions, the outer covering body is positioned on the non-skin contact surface side of the absorbent main body to fix the absorbent main body,
in the manufacturing method, the band-shaped outer package is held in a pressurized state in the pre-irradiation holding step, and the side seal portion is formed in the laser irradiation step.
9. An apparatus for manufacturing a sheet welded body, which irradiates a band-shaped sheet stacked body formed by stacking a plurality of sheets with laser light to fuse the sheet stacked body, welds cut edge portions of the plurality of sheets generated by the fusing to form a sealing edge portion, and continuously manufactures a plurality of sheet welded bodies having the sealing edge portion, the apparatus comprising:
a support member that travels in a predetermined direction with the band-shaped sheet stacked body disposed on an outer surface thereof, and that has a light passage portion through which laser light can pass;
an irradiation head which is disposed on the inner surface side of the support member and irradiates the laser beam to a predetermined region formed at the sealing edge portion of the sheet laminate through the light passage portion;
a detection unit that detects whether or not the fusing of a predetermined region formed at the sealing edge of the sheet laminate by the laser beam is satisfactory; and
a cutting unit insertion portion having a cutting unit located on a downstream side in a sheet conveying direction of the light passage portion, the cutting unit being inserted into a predetermined region of the sealing edge portion irradiated with the laser beam so as to cross in a thickness direction of the sheet laminate,
wherein the cutting unit is inserted into a region in which the detection portion determines that the sealing edge portion has a defective fusion.
10. The apparatus for manufacturing a fused-sheet body according to claim 9, wherein:
includes a pressing member that presses the sheet stacked body arranged on the outer surface of the support member from the side opposite to the support member,
maintaining the sheet stacked body in the pressed state on the outer surface of the support member when irradiated with the laser light by the pressing member.
11. The apparatus for manufacturing a fused-sheet body according to claim 9 or 10, wherein:
the cutting unit is a cutting knife.
12. The apparatus for manufacturing a fused-sheet body according to claim 9 or 10, wherein:
the cutting unit insertion portion is configured to insert the cutting unit by irradiating the sheet laminate with laser again so as to form a predetermined region in the seal edge portion of the sheet laminate and cross the sheet laminate in the thickness direction.
13. The apparatus for manufacturing a fused-sheet body according to claim 9 or 10, wherein:
the cutting unit is a cutting blade, the cutting unit insertion portion inserts the cutting blade so as to form a predetermined region in the seal edge portion of the sheet laminate and cross the sheet laminate in the thickness direction thereof,
the pressure force of the cutting blade in the thickness direction of the sheet laminate can be changed, and the cutting blade can be inserted into the region where the sealing edge formation is planned, where the detection portion detects good fusing, at a low pressure force, and inserted into the region where the sealing edge formation is planned, where a defective fusing is detected, at a high pressure force.
14. The apparatus for manufacturing a fused-sheet body according to claim 10, wherein:
the pressurizing member has an air suction portion, and a gas generated by fusing is sucked and removed by the air suction portion.
15. The apparatus for manufacturing a fused-sheet body according to claim 14, wherein:
the pressing member includes a partial pressing member having a pressing surface for partially pressing the sheet stacked body supported on the outer surface of the support member,
the pair of partial pressurizing members are disposed such that the pressurizing surfaces are positioned across the air suction port.
16. The apparatus for manufacturing a fused-sheet body according to claim 10, wherein:
comprises a plurality of the pressing parts.
17. The apparatus for manufacturing a fused-sheet body according to claim 9 or 10, wherein:
the manufacturing apparatus includes the irradiation head which is disposed in the hollow portion of the cylindrical roller and irradiates a laser beam onto a cylindrical support member which forms the peripheral surface portion of the cylindrical roller.
18. The apparatus for manufacturing a fused-sheet body according to claim 17, wherein:
the light passing portion is a slit-shaped opening penetrating the support member in the thickness direction, and the longitudinal direction thereof extends in a direction parallel to the axial length direction of the rotary shaft of the cylindrical roller.
19. An apparatus for manufacturing a pants-type disposable diaper, comprising:
comprising the device according to any one of claims 9 to 18 and used for manufacturing a pants-type disposable diaper,
a pants-type disposable diaper includes an outer package having a pair of side seals, as a sheet welded body having seal edges formed by welding edge portions of a plurality of sheets in an overlapped state.
20. The apparatus for manufacturing a pants-type disposable diaper according to claim 19, characterized in that:
a pants-type disposable diaper comprising an absorbent main body and an outer covering forming the outer surface of the diaper, wherein the left and right side edges in the longitudinal direction of the outer covering in the front body portion and the left and right side edges in the longitudinal direction of the outer covering in the back body portion are joined to form a pair of side seals, a waist opening, and a pair of leg openings, and the outer covering is positioned on the non-skin contact surface side of the absorbent main body and fixes the absorbent main body.
21. The apparatus for manufacturing a pants-type disposable diaper according to claim 20, characterized in that:
intermittently supplying and fixing the absorbent main body manufactured in the other process to the inner sheet constituting the belt-like exterior body, and then forming leg holes in the exterior body,
subsequently, the belt-like outer package is folded in a direction orthogonal to the conveyance direction of the outer package to obtain a diaper continuous body,
next, the diaper continuous body is irradiated with a laser beam using a laser joining apparatus to form a pair of side seals, and a pants-type disposable diaper including an outer package having the pair of side seals is continuously manufactured.
22. The apparatus for manufacturing a pants-type disposable diaper according to claim 20, characterized in that:
the belt-like outer body is folded back so that both side portions thereof in the transport direction cover both longitudinal end portions of the absorbent main body, both longitudinal end portions of the absorbent main body are fixed, and then the outer body is folded in two together with the absorbent main body in a direction orthogonal to the transport direction of the outer body.
CN201580066552.5A 2014-12-15 2015-11-19 Method and apparatus for manufacturing fused sheet Active CN106999319B (en)

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