US20110212818A1 - Method and apparatus for producing wearing article - Google Patents
Method and apparatus for producing wearing article Download PDFInfo
- Publication number
- US20110212818A1 US20110212818A1 US13/086,854 US201113086854A US2011212818A1 US 20110212818 A1 US20110212818 A1 US 20110212818A1 US 201113086854 A US201113086854 A US 201113086854A US 2011212818 A1 US2011212818 A1 US 2011212818A1
- Authority
- US
- United States
- Prior art keywords
- web
- elastic member
- pad
- rotation
- pads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15723—Partitioning batts; Cutting
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15585—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
- A61F13/15593—Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
- B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
- B26D1/10—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates in, or substantially in, a direction parallel to the cutting edge
- B26D1/105—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates in, or substantially in, a direction parallel to the cutting edge for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
- B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
- B26D1/40—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member
- B26D1/405—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member for thin material, e.g. for sheets, strips or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
- B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D2007/2671—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member for cutters moving in a planetary motion on their support, e.g. so-called "Ferris Wheels"
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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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
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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
- 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
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
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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
- 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
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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
- B29C66/40—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
- B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
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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
- B29C66/40—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
- B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
- B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
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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
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83411—Roller, cylinder or drum types
- B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
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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
- B29C66/8341—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
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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
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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
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
- B29C66/93411—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the parts to be joined having different speeds
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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
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
- B29C66/93431—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being kept constant over time
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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
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
- B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-constant over time
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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
- B29C66/90—Measuring or controlling the joining process
- B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
- B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
- B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
- Y10T156/1062—Prior to assembly
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
- Y10T156/108—Flash, trim or excess removal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
- Y10T156/1317—Means feeding plural workpieces to be joined
- Y10T156/1322—Severing before bonding or assembling of parts
- Y10T156/133—Delivering cut part to indefinite or running length web
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1702—For plural parts or plural areas of single part
- Y10T156/1712—Indefinite or running length work
- Y10T156/1741—Progressive continuous bonding press [e.g., roll couples]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1702—For plural parts or plural areas of single part
- Y10T156/1744—Means bringing discrete articles into assembled relationship
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
- Y10T156/1702—For plural parts or plural areas of single part
- Y10T156/1744—Means bringing discrete articles into assembled relationship
- Y10T156/1768—Means simultaneously conveying plural articles from a single source and serially presenting them to an assembly station
- Y10T156/1771—Turret or rotary drum-type conveyor
Definitions
- the present invention relates to a method and apparatus for producing a disposable wearing article such as paper diapers and pants.
- an elastic member is placed on a sheet surface.
- an elastic member allows an absorber to shrink, so that the absorber becomes stiff, degrading a feeling of wearing.
- Japanese Laid-Open Patent Publication No. 2001-224627 discloses a method for interposing a film sheet for gathering between a peripheral surface of an adsorbent roller and a cutter blade of a cutter roller, and cutting the film sheet.
- Japanese Laid-Open Patent Publication No. 63-317576 discloses a movement of a plurality of pads rotating about a predetermined axis while each of the pads changes its velocity, during a process of producing a worn article or a web (a continuous material).
- Japanese National Phase PCT Laid-Open Publication No. 2000-514024 discloses a material engagement member reciprocating in a direction parallel to a rotation axis of a drum.
- a rotation device having a simple structure and being capable of providing a complicated movement. It is also an object of the present invention to provide a method for transferring a worn article, a method for folding a web and a device for folding a web that can suitably employ the rotation device, and a disposable worn article produced by using the same.
- a first rotation device of the present invention includes: an endless guide; a plurality of moving sections that slide while being guided by the guide; and a rotation member that allows the guide to rotate about an axis.
- the plurality of moving sections are arranged in the rotation allowance direction of the rotation member; and the plurality of moving sections can slide in the direction of rotation of the rotation member or in the opposite direction by being guided by the guide.
- a second rotation device of the present invention includes: a plurality of guides; a plurality of moving sections that slide while being guided by the plurality of guides; and a rotation member that allows the plurality of guides to rotate about an axis. Furthermore each of the moving sections is guided by at least one of the guides; and the plurality of guides is provided about the axis so as to be arranged in the rotation allowance direction of the rotation member while surrounding the axis, so that the plurality of moving sections can slide in the direction of rotation of the rotation member or the opposite direction.
- the rotation member rotates at a high velocity along with the rotation of the moving sections. Meanwhile, each moving section rotates with respect to the guide at a low relative velocity. In this way, the friction between the moving sections and the guide is significantly reduced, thereby improving the durability of the device.
- the rotation member is capable of an unlimited rotation, and may be a ball bearing or a roller bearing including a rolling element such as a ball or a roller.
- the guide may be any type of guide as long as it allows the sliding movement of the moving sections in a direction including a component of the rotation allowance direction of the rotation member.
- the term “endless guide” as used herein refers to not only a generally completely ring-shaped guide, but also to those having slight gaps in the circumferential direction, or even to those obtained by arranging guide elements, which together form one guide, so as to be spaced apart from one another at a predetermined interval. Moreover, the guide elements may overlap with one another as viewed in the axial direction.
- the phrase “in a direction including a component of the rotation allowance direction of the rotation member” as used herein means that a guide element may be provided in an inclined direction.
- the guide element may be a rail or a groove.
- the phrase “a plurality of guides” means that the guides are spaced apart from one another in the direction of rotation or in the axial direction to such a degree that a moving section cannot move from one guide to another.
- the plurality of guide elements together form one guide.
- a controller for controlling the moving velocity of the moving sections.
- Such a controller causes the moving sections to rotate at differing predetermined instantaneous velocities, thereby changing the pitch between the moving sections during rotation.
- instantaneous velocity refers to a velocity in a minute period of time, meaning that each moving section rotates while changing its velocity depending on the rotational position thereof.
- the present invention can be used with a rotation device as described in PCT International Publication WO01/44086, a method for transferring worn articles while changing the pitch thereof, a method for folding a web, or a device for folding a web.
- a method for folding a web of the present invention is a method for folding a web by using a rotation device including a plurality of pads that rotate about a predetermined axis so as to continuously transfer the web.
- the method includes: supplying the web onto surfaces of the rotation device pads; rotating adjacent ones of the pads onto which the web has been supplied so as to change the interval therebetween to slacken a portion of the web between the adjacent pads, thereby folding the portion of the web; and releasing the web from the pads.
- Such a folding method can be realized using the first or second rotation devices of the present invention.
- Other rotation devices such as that described in PCT International Publication WO01/44086 may be used in place of the rotation device including a plurality of pads.
- a device for folding a web of the present invention is a device for folding a web to form a wall in a direction transverse to a web running direction.
- the device includes: a transfer member for forming a slack portion in the web in the running direction thereof while continuously transferring the web; and a member for folding the slack portion so as to form the wall.
- wall refers to a portion of a web or a sheet-like material that has been folded, regardless of whether the wall is laid down along the surface of the web or standing on the web.
- the “transfer member” may be any member including a plurality of transfer sections for transferring the web in the web running direction, wherein the transfer velocity of one of the transfer sections is set to be lower than that of another transfer section upstream of the one of the transfer sections so as to form a slack portion in a portion of the web between the upstream and downstream transfer sections.
- a directioning member for defining the direction in which a slack portion is to be folded.
- slack portion refers to a portion of a web on which no tension is applied.
- a fold-holding section for maintaining the shape or condition of a folded portion obtained by folding the slack portion.
- FIG. 1 is a side layout view of an apparatus for producing a wearing article of Embodiment 1 according to the present invention.
- FIG. 2 is a side layout view illustrating the steps of cutting an elastic member in the apparatus shown in FIG. 1 .
- FIG. 3A is a perspective view of a stack in a state before the elastic member is cut
- FIG. 3B is a perspective view of a stack in a state after the elastic member is cut.
- FIG. 4A is a front view showing the stack in which the elastic member interposed between webs is cut
- FIG. 4B is a front view showing a wearing article.
- FIGS. 5A and 5B are partial side views showing a circumferential velocity of pads.
- FIG. 6 is a side layout view showing an apparatus for producing a wearing article of Embodiment 2 according to the present invention.
- FIG. 7 is a front view showing webs in a state where the elastic member is placed.
- FIG. 8 is a front view showing webs in a state where an absorber is attached.
- FIG. 9A shows webs whose both edges are bent
- FIG. 9B shows webs folded into two.
- FIGS. 10A to 10F are front views illustrating a method for placing a second elastic member.
- FIGS. 11A to 11C show an example of cutting the elastic member with a cutting machine
- FIG. 11D shows another cutting machine.
- FIG. 12 shows diapers obtained by cutting the elastic member so that a trim is not generated, and shifting the phase of one web thus cut by substantially 1 ⁇ 2 from the other web.
- FIG. 13A is a schematic cross-sectional view illustrating a first embodiment of the rotation device of the present invention.
- FIG. 13B is a side view illustrating the first embodiment of the rotation device of the present invention.
- FIG. 14A is a schematic cross-sectional view illustrating a second embodiment of the rotation device of the present invention.
- FIG. 14B is a side view illustrating a portion of a fixed pin and groove arrangement for controlling a rotational velocity of a bridging section according to the second embodiment of the invention.
- FIG. 15A is a schematic cross-sectional view illustrating a third embodiment of the rotation device of the present invention.
- FIG. 15B is a schematic perspective view illustrating an example where a plurality of guides are provided in a concentric manner.
- FIG. 15C is a schematic perspective view illustrating another example where a plurality of guides are provided so as to be spaced apart from each other in the axial direction of an axis O.
- FIG. 16 is a schematic side view illustrating a transfer device.
- FIG. 17 is a schematic side view illustrating a folding device.
- FIG. 18A is a perspective view illustrating an example of a guide and a moving section.
- FIG. 18B is a perspective view illustrating another example of a guide and a moving section.
- FIG. 19A is a schematic view illustrating a variation of a folding device.
- FIG. 19B is a diagram illustrating plates between two pads being in a spread formation.
- FIG. 19C is a diagram illustrating plates being folded into a bellows-like shape.
- FIG. 19D is an enlarged view illustrating plates between two pads.
- FIG. 20 is a schematic diagram illustrating another variation of a folding device.
- FIG. 21 is a schematic diagram illustrating another embodiment of a folding device.
- FIG. 22 is a perspective view illustrating an example of a top sheet.
- FIG. 23 is a perspective view illustrating an example of a top sheet before cutting.
- FIG. 24 is a perspective view illustrating another example of a top sheet before cutting.
- FIG. 25 is a diagram illustrating a portion of another example of a bellows-shaped folding device.
- FIG. 26A is a diagram illustrating an elastic member being introduced so as to extend across a slack portion that has been obtained through a “Z-shaped folding process”.
- FIG. 26B is a diagram illustrating a web after cutting off the elastic member and removing the slack.
- FIG. 27 is a diagram illustrating an example of a device for intermittently introducing an elastic member between a first web that has been subjected to a “Z-shaped folding process” and a second web.
- FIG. 28 is a diagram illustrating an example of a pants-shaped diaper, which is a disposable worn article, being spread out.
- FIGS. 1 to 5 A-B show Embodiment 1.
- An apparatus for producing a wearing article shown in FIG. 1 is capable of providing a web with looseness and intermittently placing an elastic member on at least a part of the web.
- the apparatus for producing a wearing article includes a rotation apparatus 1 capable of providing a second web W 2 with looseness and a second roller 12 capable of placing an elastic member F on portions of the second web W 2 other than those which are loose.
- the apparatus can intermittently place the elastic member F on the second web W 2 . This intermittent placement is mainly caused by the looseness of the second web W 2 .
- the configuration and operation of the rotation apparatus 1 , the second roller 12 , and the like will be described.
- a supply apparatus 3 of the elastic member F supplies the elastic member F to the surface of a first roller 11 .
- the elastic member F on the first roller 11 is fed to the second roller 12 .
- a circumferential velocity V 2 of the second roller 12 is set to be larger than a circumferential velocity V 1 of the first roller 11 . Therefore, the elastic member F is stretched between the first roller 11 and the second roller 12 .
- the second roller 12 is supplied with a first web W 1 .
- the second roller 12 transports the first web W 1 while sucking the first web W 1 by vacuum suction or the like.
- On the surface of the second roller 12 for example, a number of suction holes 12 a for sucking the first web W 1 may be provided.
- the first web W 1 is divided into a predetermined size with a web cutter 2 . In this division, the first web W 1 may be cut or half-cut to a predetermined length in a transport direction.
- the first web W 1 may be cut to a predetermined length together with the elastic member F in a subsequent step or cut in a predetermined length when an interval of pads is increased. After this division, the elastic member F is placed so as to spread across the surface of the respective first webs W 1 .
- the elastic member F is made of thread rubber or flat rubber, an adhesive is applied to at least one of the elastic member F, the first web W 1 , and the second web.
- the elastic member F is cut together with the first web W 1 .
- the elastic member F is made of hot-melt resin
- molten resin discharged from the supply apparatus 3 is cooled by the first roller 11 .
- the molten resin may be cooled with cool water.
- the first roller 11 may be a porous roller.
- the first roller 11 may be configured so that air is discharged from the inside of the first roller 11 through holes. Due to the air, the hot-melt resin becomes unlikely to adhere to the roller. When the air is discharged from the porous body, the volume of the air is increased to cool the roller. Thus, the hot-melt resin can be cooled.
- the porous roller may be formed by sintering stainless ball or the like.
- the first roller 11 is provided with grooves or the like, whereby resin is molded.
- resin is molded.
- mesh-shaped (for example, lattice-shaped) grooves are formed on the first roller 11 , and hot-melt resin is applied to the grooves of the first roller 11 with a coater or the like, whereby a mesh-shaped elastic member is formed.
- the hot-melt resin may be a kneaded composition and may comprise a thermoplastic resin, tackifier, viscosity adjuster, antioxidant, heat stabilizer, ultraviolet radiation absorbent, bulking agent, elasticizer, and the like.
- the thermoplastic resin may include elastomers such as olefins ⁇ EVA (ethylene-vinyl acetate copolymer), APAO (amorphous-poly- ⁇ -olefin) ⁇ , rubbers ⁇ SIS (styrene-isoprene-styrene copolymer), SBS (styrene-butadiene-styrene copolymer), SEBS (styrene-ethylene-butadiene-styrene copolymer), SEPS (styrene-ethylene-propylene-styrene copolymer) ⁇ , polyamides and polyesters.
- the thermoplastic resin may be a single elastomer or a blend of more than one
- the rotation apparatus 1 for folding is placed in the vicinity of the second roller 12 .
- the rotation apparatus 1 has a plurality of pads 9 capable of sucking the second web W 2 and transporting it. On the surface of a pad 9 i , suction holes 10 for sucking the second web W 2 are provided.
- the rotation apparatus 1 continuously transports the second web W 2 , and is in contact with the surface of the second roller 12 via the first web W 1 , the elastic member F, and the second web W 2 at a contact point O (predetermined position). Thereafter, the following may also be possible: an additional roller and the pad 9 i sandwich the first web W 1 , the elastic member F, and the second web W 2 placed on the pad 9 i , whereby the contact therebetween is enhanced.
- the elastic member F is cut after being interposed between the first web W 1 and the second web W 2 .
- the elastic member F is fixed between the webs W 1 and W 2 , so that the elastic member F shrinks less, compared with the case where the elastic member F is placed on one web.
- the rotation apparatus 1 receives the second web W 2 at a circumferential velocity V 11 at a receiving position RP.
- the circumferential velocity of the pad is V 11 .
- FIG. 5A is a side view showing the enlarged vicinity of the point “A” of FIG. 1 .
- the pad 9 i+1 moves at a substantially constant circumferential velocity V 11 . The reason for this is to prevent the second web W 2 from being damaged.
- Each pad 9 i of the rotation apparatus 1 is rotated at the receiving position RP at the circumferential velocity V 11 , and decelerates to a circumferential velocity V 21 before reaching the contact point O (where the distance between the pad 9 i and the pad 9 i+1 becomes minimum). Therefore, the interval between the pad 9 i and the pad 9 i+1 becomes narrow before the pad 9 i moves from the receiving position RP to the contact point O. This causes the second web W 2 to become loose between the pad 9 i and the pad 9 i+1 , whereby a loose portion Wa is formed.
- the pad 9 i comes into contact with the second roller 12 via the second web W 2 and the like at the circumferential velocity V 21 (V 11 >V 21 ) at the contact point O shown in FIG. 1 .
- the first web W 1 is transferred from the second roller 12 at the circumferential velocity V 2 .
- the circumferential velocity V 21 of the pad 9 i is set at a substantially constant velocity equal to or close to the circumferential velocity V 2 of the second roller 12 . That is, while at least the pad 9 i is in contact with the second roller 12 via the second web and the like or at least the pad 9 i places the first web W 1 on the second web W 2 , the pad 9 i moves at the substantially constant circumferential velocity V 21 substantially equal to V 2 .
- the pad 9 i moves the constant circumferential velocity V 21 ( ⁇ V 2 ).
- the difference in velocity prevents the first web W 1 and the second web W 2 from being shifted from each other, and exactly places the first web W 1 at a predetermined position of the second web W 2 .
- FIG. 5B is a side view showing the enlarged vicinity of the point B.
- the pad 9 i moves at a substantially constant circumferential velocity V 31 at least during a period from a time slightly before the pad 9 i+1 adjacent to the pad 9 i releases the second web W 2 to a time when the pad 9 i releases the second web W 2 ( FIG. 5B ).
- the reason for this is to minimize the fluctuation in velocity of the released second web W 2 .
- the circumferential velocity of an embossing roller 5 is V 3
- the circumferential velocity V 31 becomes substantially equal to V 3 .
- the pad 9 i When or after the circumferential velocity of the pad 9 i becomes maximum in the vicinity of the point A in FIG. 5A , the pad 9 i receives the second web W 2 . If the pad 9 i receives the second web W 2 before the circumferential velocity of the pad 9 i becomes maximum, the interval between adjacent pads is increased, which may damage the second web W 2 . As the operation of the pad 9 i , the pad 9 i may move at a maximum circumferential velocity, for example, during a period from the point B to the point A. In this case, a region from the point B to the point A can be dealt with as one region. That is, in the present embodiment, the circumferential velocity of the pad may become substantially constant at least at two points.
- the apparatus is provided with a directing part so that the loose portion Wa in FIG. 1 becomes loose exactly toward the center of the rotation apparatus 1 .
- the directing part may be, for example, a mechanism for jetting air or a mechanism for pushing the loose portion Wa of the web toward the center of the rotation apparatus 1 .
- the directing part may be a mechanism for sucking the web W toward the center of the rotation apparatus 1 by vacuum suction.
- the directing part is a mechanism for jetting air
- one or a plurality of directing parts may be provided.
- the directing part is a mechanism for pushing the loose portion Wa
- one or a plurality of directing parts may be provided.
- the loose portion Wa can be bent exactly toward the center of the rotation apparatus 1 .
- the loose portion Wa may have a shape dented toward the center of the rotation apparatus 1 due to the weight of the second web W 2 .
- the rotation apparatus for conducting the above-mentioned “folding” is not limited to the rotation apparatus 1 .
- an apparatus described in Japanese Patent Application No. 2001-545183 A may be used.
- the present invention is intended to place an elastic member intermittently on a web. Therefore, the second web W 2 is not necessarily folded completely. Furthermore, depending upon the shape of the pad 9 i , the second web W 2 may have a loop shape.
- the folded second web W 2 is attached to be stacked on the first web W 1 at non-folded portions We before and after the folded portion Wb. That is, the elastic member F is not cut until the elastic member F is placed and fixed between the first web W 1 and the second web W 2 . Therefore, the stretched elastic member F hardly shrinks on the second web W 2 .
- the first web W 1 is not placed on the folded portion Wb folded between the pads 9 i and 9 i+1 adjacent to each other in the vicinity of the contact point O.
- the interval between the pads 9 i and 9 i+1 is increased as shown in FIG. 2 , only the elastic member F is exposed as shown in FIG. 3A .
- suction of air through the suction holes 12 a of the second roller 12 may be stopped or air may be discharged through the suction holes 12 a .
- the purpose of this is to attach the first web W 1 to the second web W 2 smoothly.
- the exposed elastic member F in FIG. 3A is cut with a cutter.
- a light cutter 4 shown in FIG. 2 is used.
- the light cutter 4 has a rotatable cover, and a slit 42 is formed at a part of the cover.
- the cover 41 with the slit 42 is rotated, whereby infrared rays are radiated intermittently from a light source 40 to the elastic member F to cut it at a predetermined pitch.
- the elastic member F may be cut with a pressure, heat, UV-rays, a laser or at least two of them. Furthermore, the elastic member F may be cut with an ultrasonic wave.
- FIG. 11A is a view showing a cutting machine 43 that is an example of a cutter.
- the cutting machine 43 has a rotatable roller 44 and at least one of blade 45 placed at the roller 44 .
- the distance between the rotation center of the roller 44 and the center of the rotation apparatus 1 is hardly changed.
- the blade 45 can cut the elastic member F positioned on the loose portion Wa between the pads 9 i and the pad 9 i+1 , when the roller 44 is rotated.
- the rotation of the roller 44 is changed in accordance with the rotation of at least one of the pad 9 i and the pad 9 i+1 .
- the blade (s) 45 may have a linear shape ( FIG. 11B ) or may be in a jagged shape ( FIG. 11C ).
- the blade 45 may be reciprocated in the direction of the rotation axis.
- FIG. 11D shows another cutting machine 46 .
- the cutting machine 46 includes a rotatable large roller 47 , a rotatable small roller 48 attached to the large roller 47 , and a blade 49 placed at the small roller 48 .
- the blade 49 of the cutting machine 46 can cut the elastic member F positioned on the loose portion Wa between the pad 9 i and the pad 9 i+1 , when the large roller 47 and the small roller 48 are rotated.
- the rotations of the large roller 47 and the small roller 48 are changed in accordance with the rotation of at least one of the pad 9 i and the pad 9 i+1 .
- the tip end of the blade 49 is preferably directed to the center of the rotation apparatus 1 .
- the blade 49 may have a shape as shown in FIG. 11B or 11 C, and may be reciprocated in the direction of the rotation axis of the large roller 47 or the small roller 48 .
- the small roller 48 of the cutting machine 46 may have a plurality of blades 49 as shown in FIG. 11E .
- the blades 49 may be reciprocated in the direction of the rotation axis to cut the elastic member.
- the rotation apparatus 1 may be provided with scissors instead of the cutting machine. After the second web W 2 is stacked on the first web W 1 , and the interval between the pad 9 i and the pad 9 i+1 is slightly increased, the scissors may enter between the pad 9 i and the pad 9 i+1 to cut the elastic member stretched between the pad 9 i and the pad 9 i+1 . The scissors may enter between the pad 9 i and the pad 9 i+1 in accordance with the rotation of at least one of the pad 9 i and the pad 9 i+1 . In order for the scissors to perform such an operation, at least one of a cam mechanism and a link mechanism may be used.
- the circumferential velocity of the pad 9 3 becomes a velocity V 31 (V 31 >V 21 ) at a releasing position SP where the pad 9 3 releases the second web W 2 . Therefore, the interval between the pads 9 3 and 9 4 is increased from the contact point O to the releasing position SP. Therefore, the tension stress and elongation of the elastic member F are increased from the contact point O to the releasing position SP.
- the elastic member F is cut with the light cutter 4 in this state, cutting becomes easy.
- a stack N 1 in FIG. 3B in which the webs W 1 and W 2 and the elastic member F are stacked, is in the state before the folded portion Wb is folded.
- suction through the suction holes 10 may be stopped, and air may be discharged through the suction holes 10 .
- the purpose of this is to smoothly transfer the stack N 1 in a downstream direction.
- an embossing roller 5 may be provided downstream from the releasing position SP.
- the stack N 1 in FIG. 3B is sent to the embossing roller 5 .
- a plurality of convex portions 51 are arranged on the embossing roller 5 , and at least the elastic member F of the stack N 1 is cut with the convex portions 51 .
- the stack N 1 is obtained in which the shrinking force of a part of the elastic member F interposed between the first and second webs W 1 and W 2 is suppressed.
- An adhesive is not basically applied to a portion CP where the shrinking force of the elastic member F is suppressed by the embossing roller 5 . The reason for this is to protect the shrinking of the elastic member F. However, in order to control the shrinking of the elastic member F, some adhesive weaker than usual may be applied.
- a portion represented by a solid line in FIG. 4B shows an example of a disposable diaper produced by the production method of the present invention.
- the stack N 1 at least a part of an absorber C is fixed at the portion Wb of the stack N 1 where the elastic member F is not placed.
- the other end of the absorber C is connected to another stack N 2 represented by a broken line.
- the absorber C is folded into two, and the portion CP of the stack N 1 comes into contact with a corresponding portion of another stack N 2 , whereby continuous disposable diapers can be produced.
- Another stack N 2 may have the same configuration as that of the stack N 1 .
- the absorber C is folded into two, and the portion CP of the stack N 1 comes into contact with the corresponding portion of another stack N 2 , whereby the stacks N 1 and N 2 are stretched in a flow direction, even if the elastic member F is placed at the portion CP, the above connection can be conducted.
- one web may be allowed to pass through a dummy roller to cause a delay from the other web.
- a production apparatus shown in FIG. 6 is capable of placing at least three kinds of elastic members F 1 to F 3 for a leg gathering on a wearing article, as shown in FIG. 9A .
- the present apparatus includes a first roller 11 for placing a first elastic member 1 for a waist gathering and a guide unit 23 for placing a second elastic member 2 for a leg gathering.
- the guide unit 23 is capable of arranging the second elastic member F 2 for a leg gathering in a curved shape or a linear shape by being reciprocated in the axis direction of a second roller 12 with, for example, a cam or a servo motor.
- U.S. patent application Ser. No. 10/095,959 discloses an example of the guide unit 23 .
- the second elastic member F 2 may be cut mechanically with scissors, a blade, or the like provided at the roller.
- FIGS. 11A to 11D show examples of a cutter.
- the first elastic member F 1 may not be a thermoplastic elastic member.
- the first elastic member F 1 can be cut with scissors, a blade, or the like in the same way as in the second elastic member F 2 . Furthermore, the first and second elastic members F 1 and F 2 may be cut with the same scissors, blade, or the like. In the steps until here in Embodiment 2, the other configuration is the same as that of Embodiment 1. Like parts are denoted with like reference numerals, and the detailed description and drawings are omitted here.
- the first and second elastic members F 1 and F 2 are cut to be arranged as shown in FIG. 7 .
- an elastic member for a leg gathering is placed on a crotch portion. Therefore, such a portion contrasts to cause an unsatisfactory feeling during wearing.
- the elastic member on the crotch portion is cut so as to shrink, whereby the elastic member on the crotch portion can be made short to some degree.
- FIGS. 10A , 10 C, and 10 E show the second elastic member F 2 interposed between the first web W 1 and the second web W 2 on adjacent pads 9 , wherein a part of the web W 2 is interposed between the adjacent pads 9 .
- a folded portion Wb is formed on the crotch portion G of the first web W 1 , and the second elastic member F 2 is placed on non-folded portions Wc. Thereafter, the second elastic member F 2 striding across the adjacent pads 9 is cut. As a result, the second elastic member F 2 is not placed on the crotch portion G, as shown in FIGS. 10B and 10D .
- FIG. 10F when a non-coated portion Df with no adhesive applied thereto is provided in the non-folded portion Wc adjacent to the vicinity of the folded portion Wb, after the second elastic member F 2 is cut, a portion of the second elastic member F 2 that is not sufficiently attached to the non-folded portion Wc shrinks ( FIG. 10F ).
- Full-circle pants may be produced by such adjustment of an adhesive. Some adhesive may be applied to the non-coated portion Df. In this case, the second elastic member F 2 shrinks slowly without being fixed to the non-folded portion Wc, and finally, the second elastic member F 2 can be eliminated from the crotch portion G.
- an adhesive may be applied in an annual shape to at least one of the first and second webs W 1 and W 2 with a coater or the like.
- guns with a plurality of valves are placed in a direction across the first web W 1 so that opening/closing of the valve may be controlled by the flow speed of at least one of the first web W 1 and the second web W 2 and the coating shape.
- an adhesive can be applied in arbitrary regions partitioned in a matrix.
- An absorber C is arranged and attached to the webs W 1 and W 2 in the above-mentioned arrangement state of the elastic members by a turn apparatus 30 . Thereafter, a third elastic member F 3 for a waist gathering is placed to form an attachment state of an absorber as shown in FIG. 8 .
- the turn apparatus 30 is provided with a plurality of suction pads 30 p around a drum (not shown).
- the suction pads 30 p are rotated in an arrow direction while changing the posture of the absorber C by 90° by turning.
- an apparatus as disclosed by International Publication No. WO 01/44086 or U.S. Patent Application Publication No. US 2002/0103468 may be used, as is described in more detail below.
- the webs W 1 and W 2 with the absorber attached thereto have their folding portions E on both edges folded inward at a position of two-dot dash lines L 2 shown in FIG. 8 by a folding apparatus 31 .
- a leg hole Lh is cut out with a leg hole cutter 32 ( FIG. 6 ), whereby a both-edge folded state shown in FIG. 9A is formed.
- the leg hole cutter 32 may be placed upstream from the turn apparatus 30 . In such a configuration, it also becomes possible to produce a disposable wearing article in which a part of the absorber C extends out to the leg hole Lh portion.
- the webs W 1 and W 2 are folded into two at a folding line B by a two-folding apparatus 33 , whereby the webs W 1 and W 2 are folded into two as shown in FIG. 9B .
- a two-folding apparatus 33 for example, an apparatus described in U.S. Pat. No. 3,828,367, U.S. Pat. No. 5,711,832, or U.S. patent application Ser. No. 10/147,644 may be used.
- the webs W 1 and W 2 folded into two have both edges L sealed (e.g., heat-sealed or sonic-sealed), as shown in FIG. 9B .
- a cutting portion D represented by a two-dot dash line is cut to form an individual disposable wearing article, e.g., pants P.
- the present apparatus may form pants P from the webs W 1 and W 2 (hereinafter, referred to as a “stacked web W”) folded into two, using a decelerating drum 34 , a main drum 37 , a seal roller 35 , and a cutter roller 36 .
- the web W has an elastic member
- the web W is moved in a stretched state so that placement of an absorber at a predetermined position, formation of a leg hole, and other processing can be performed easily.
- the position of the edge L only needs to be determined. This is because the state of the other portions of the web W does not influence a sealing step and a cutting step.
- a flow speed of the web W is lower so as to obtain a sufficient time for melting a part of the web W and the like.
- the decelerating drum can decrease the flow speed of the web W so as to obtain a sufficient time for melting the part of the web W and the like.
- an apparatus described in JP 63-317576 A, International Publication No. WO 01/44086, or U.S. Patent Application Publication No. 2002/0103468 may be used.
- the decelerating drum 34 is provided with a plurality of pads 34 p rotating in a transport direction of the stacked web W around a drum (not shown).
- the decelerating drum 34 receives at least an edge L at a receiving position RP from the two-folding apparatus 33 placed upstream therefrom, and holds it.
- the other portions of the web W are positioned between adjacent pads 34 p .
- the edge L is transported to a releasing position SP, and thereafter, the edge L is supplied to the main drum 37 placed downstream therefrom at the releasing position SP. While the pad 34 p moves from the receiving position RP to the releasing position SP, the interval between the adjacent pads 34 p is changed to be narrow.
- the pad 34 p is capable of receiving the edge L in a stretched state at the receiving position RP, and keeping holding the edge L shown in FIG. 9B .
- the edge L may be held by sucking the edge L, pressing the edge L with a hook, or fixing the edge L with a pin placed at the pad 34 p .
- the interval between the adjacent pads 34 p which has been increased at the receiving position RP, is decreased before the releasing position SP, and a shrinking portion S excluding the edge L shrinks in a transport direction X.
- the shrinking force of the elastic member positioned at the edge L may be weakened by an embossing roller 38 .
- the embossing roller 38 can cut the elastic member to a predetermined length or change the elastic configuration of the elastic member by using at least one of heat and pressure.
- an apparatus described in U.S. Patent Application Publication No. 2002/0103468 may be used.
- the embossing roller 38 is placed in a region from the rotation apparatus 1 to the two-folding apparatus 33 .
- the main drum 37 receives the web W in a mixed state where the stretched edge L and the shrinking portion S that has shrunk are present alternately from the decelerating drum 34 .
- the main drum 37 transports the web W in such a mixed state.
- the main drum 37 may be provided with, for example, a plurality of suction holes to suck air through the suction holes so as to suck the web W.
- the seal roller 35 can conduct heat-sealing by heating and pressing the edge L ( FIG. 9B ) of the web W. More specifically, the web W is pressed by being interposed between the seal roller 35 and the main drum 37 , and heated by the seal roller 35 .
- the seal roller 35 may be provided with, for example, a heater so as to heat-seal the edge L. Furthermore, the seal roller 35 may have a horn to conduct sonic-sealing.
- the web W subjected to the above-mentioned heat-sealing is cut to individual pants P by a cutter roller 36 placed downstream therefrom.
- the decelerating drum 34 continuously receives the web W onto each pad 34 p under the condition that the web W is stretched in a flow direction.
- the pad 34 p holds the edge L ( FIG. 9B ) of the web W in a stretched state.
- the pad 34 p having received the web W After receiving the web W, the pad 34 p having received the web W has its circumferential velocity decreased, whereby the interval between the adjacent pads 34 p becomes narrow. Therefore, a portion S other than the edge L of the web W shown in FIG. 9B shrinks in a transport direction X to form the shrinking portion S. On the other hand, the edge L is held in a stretched state.
- the main drum 37 receives the web W from the decelerating drum 34 .
- the main drum 37 receives the web W in a mixed state where the edge L in a stretched state and the shrinking portion S that has shrunk are present alternately.
- the main drum 37 transports the web W in a downstream direction while keeping the mixed state.
- the seal roller 35 presses and heats the edge L of the web W on the main drum 37 .
- a part of the web W shrinks, so that the transport velocity of the web becomes low. Sealing can be conducted exactly, as the transport velocity of the web W is low.
- the web W is cut to individual pieces with a cutter roller 36 to form pants P.
- the elastic member is cut between adjacent first webs. Therefore, the second web and an absorber do not become stiff between the first webs.
- first webs are placed on a second web under the condition where they are away from each other. Therefore, the first web is not stacked on a portion where a gathering of the elastic member is not formed, so that such a portion becomes thin and allows air to pass therethrough. As a result, a user wearing such an article is not likely to feel stuffy.
- the elastic member is cut between the first webs and at a loose portion of the second web. Therefore, only the elastic member can be cut without damaging the web.
- the first web can be transferred to a predetermined posit ion of the second web exactly.
- the elastic member is cut under the condition that the tension stress of the elastic member is increased, the elastic member can be cut easily with infrared rays or the like.
- the transport velocity of the web can be increased without impairing the exactness of heat-sealing.
- FIGS. 13A-28 further detail regarding the rotation apparatus or device will be described as originally set forth in U.S. Patent Application Publication No. US 2002/0103468.
- FIG. 13A and FIG. 13B illustrate an embodiment of the present invention.
- a rotation device 1 includes a rotation section B, a guide 3 ′ and a plurality of moving sections 4 1 to 4 n .
- the rotation device 1 also includes a driving section 2 ′.
- the driving section 2 ′ inputs a rotational force to the moving sections 4 i .
- a rotational force from a rotational power source such as a motor is transmitted to the driving section 2 ′ via a power transmission portion 5 ′ and a shaft 20 , so that the driving section 2 ′ rotates about an axis O at a constant velocity, for example.
- the driving section 2 ′ is axially and rotatably supported by a drum 6 via a bearing B 1 .
- the axis O of the driving section 2 ′ is eccentric to an axis C of the drum 6 . Due to such an eccentric structure, it is possible to, for example, periodically change the velocity of each moving section 4 i while the driving section 2 ′ rotates.
- a guide 3 ′ is attached to the drum 6 via the rotation section B′ such as a ball bearing and a rotation ring 50 .
- the rotation device 1 illustrated in FIG. 13A two or more endless guides 3 ′ are provided spaced apart from each other in the axial direction of the drum 6 .
- a plurality of moving sections 4 1 to 4 i are attached to each guide 3 ′ so that the moving sections 4 1 to 4 i are movable in the circumferential direction of the guide 3 ′. Therefore, each moving section 4 i rotates around the drum 6 along with the guide 3 ′ while additionally moving relative to the guide 3 ′ around the drum 6 along the guide 3 ′.
- an R Guide manufactured by THK® Co., Ltd., as illustrated in FIG. 18A , or a Gonio Way manufactured by Nippon Bearing Co., Ltd. may suitably be employed.
- a rolling element such as a ball or a wheel is inserted between the guide 3 ′ and the moving section 4 i .
- Each guide 3 ′ may be a number of rails or grooves attached together in the circumferential direction of the rotation section B′. Basically, it is preferred that the reciprocating movement is a rolling movement of a bearing, or the like, but may alternatively be a sliding movement.
- a bridging section 7 i is provided so as to extend between each pair of moving sections 4 i that are spaced apart from each other in the axial direction of the drum 6 .
- One end of an arm 70 i is fixed to the bridging section 7 i , and a link 8 i is rotatably attached to the other end of the arm 70 i .
- a controller being capable of moving the moving sections 4 i at a programmed velocity, is provided by the link 8 i in combination with the eccentricity between the axes C and O.
- the controller may be provided by any other link mechanism, or a controller described in PCT International Publication WO01/44086, for example, may be used.
- each link 8 i is rotatably attached to the driving section 2 via a bearing B 2 and a fixed pin 8 a
- the other end of each link 8 i is rotatably attached to the arm 70 i via a bearing B 3 and a rotation pin 8 b
- the driving section 2 rotates at a substantially constant velocity
- the fixed pin 8 a rotates, together with the driving section 2 , at a substantially constant angular velocity
- the rotation pin 8 b rotates around the fixed pin 8 a
- the angular velocity of the rotation pin 8 b changes depending on the rotation angle of the rotation pin 8 b
- the bridging section 7 i integral with the rotation pin 8 b rotates around the drum 6 while changing the interval (pitch) with respect to an adjacent bridging section 7 i , as illustrated in FIG. 13B .
- each bridging section 7 i rotates at a relatively low velocity while it rotates from the position of the bridging section 7 n to that of the bridging section 7 2 of FIG. 13B , whereas the bridging section 7 i rotates at a higher velocity while it rotates from the position of the bridging section 7 2 to that of the bridging section 7 n . Therefore, the spacing interval (pitch) between adjacent bridging sections 7 i changes along with the rotation of the bridging sections 7 i .
- FIG. 14A and FIG. 14B illustrate another embodiment of the rotation device 1 .
- the rotation ring 50 is coupled to each rotation section B′, and an attachment section 75 i , through which a pad to be described later is inserted, is provided in a generally central portion of each bridging section 7 i .
- the attachment section 75 i may be a space in the form of a through hole, a notch, a depression, etc.
- a groove 8 A i elongated in the radial direction of the drum 6 is provided, instead of the link 8 i , at an end of each bridging section 7 i .
- the groove 8 A i is provided with the fixed pin 8 a illustrated in FIG. 14B so that the fixed pin 8 a is slidable in the radial direction. Therefore, the rotational velocity of the bridging section 7 i changes as in the previous embodiment.
- the velocity of the bridging section 7 i may be controlled by a link as illustrated in FIG. 13 , or alternatively by any other controller mechanism as described above.
- FIG. 15A to FIG. 15C schematically illustrate another embodiment of the rotation device of the present invention.
- the rotation device 1 illustrated in FIG. 15A includes an endless guide 3 ′, a plurality of moving sections 4 i moving along the guide 3 ′, and the rotation section B.
- the rotation section B′ allows the guide 3 ′ to rotate about the axis of the rotation section B′.
- the plurality of moving sections 4 np are arranged in the rotation allowance direction of the section B′ (i.e., the direction in which the rotation section B′ allows the guide 3 ′ to rotate).
- Each moving section 4 i can move away from or toward an adjacent moving section 4 i , and can reciprocate along the guide 3 ′ in the direction of rotation of the rotation section B′ or in the opposite direction. If the reciprocating movement is done over a particular region of the rotation section B′, the guide 3 ′ may not need to be endless.
- a plurality of arc-shaped guides 3 ′ may be arranged about the axis O of the rotation section B′ so as to be spaced apart from one another in the rotation allowance direction of the rotation section B, surrounding the axis O.
- each of the plurality of guides 3 ′ includes at least one moving section that is movable in the direction of rotation of the rotation member or in the opposite direction.
- the guide 3 ′ of FIG. 15A is rotated at a predetermined rotational velocity about the axis O by a rotational force applying member (e.g., a motor or a power transmission device), which is not shown in the figure.
- the annular guide 3 ′ is arranged at a predetermined position with respect to the rotation section B′.
- a plurality of moving sections 4 1 to 4 i are movably attached to the guide 3 ′.
- Each moving section 4 i can move along the guide 3 ′ along with the rotation of the rotation section B′.
- the interval between a pair of adjacent moving sections changes depending on the rotational position.
- a predetermined controller as described above may be employed to accurately control such an interval.
- a certain level of control can be provided by, for example, the gravitational acceleration acting on the moving sections 4 i .
- a motor may be provided for each moving section 4 i for driving the moving section 4 i along the guide 3 ′ so that the moving section 4 i rotates at an instantaneous velocity according to a rotational angle .theta..sub.i.
- the rotation section B′ may be optional.
- the rotation device 1 includes the endless guide 3 ′, and a plurality of moving sections 4 i that move while being guided by the guide 3 ′.
- the rotation device 1 in which the guide 3 ′ is provided with a plurality of moving sections 4 i may have a poor friction resistance as compared with one using ball bearings, but such a rotation device 1 can be lighter in weight than rotation devices in the prior art.
- FIG. 16 illustrates an example of a method for transferring a worn article using the rotation device 1 .
- the rotation device 1 includes pads 9 i each attracting an article N and allowing the article N to be transferred.
- each pad 9 i may be provided in the bridging section, or the bridging section may serve as a pad (i.e., the bridging section itself may be used as a pad).
- each pad 9 i may be fit into the attachment section 75 i of the bridging section so that the pad 9 i can rotate (e.g., about the direction normal to the drum 6 ), or the bridging section may serve as a pad.
- each pad 9 i may be provided in the moving section.
- Each pad 9 i of FIG. 16 includes a plurality of suction holes for attracting the article N, and the suction holes are placed under a negative pressure to attract the article N while the pad is moving from the position of the pad 9 1 (where the article N is received from a first conveyer C 1 ) to the position of the pad 9 3 (where the article N is handed over to a second conveyer C 2 ).
- the pad 9 i may alternatively attract the article N by using an electrostatic charge, or the like.
- the first conveyer C 1 is provided upstream of the rotation device 1 , and the second conveyer C 2 is provided downstream of the rotation device 1 .
- the first conveyer C 1 transfers the articles N to the rotation device 1 at an interval D 1 .
- each pad 9 i rotates at a circumferential velocity V 1 that is about the same as that of the first conveyer C 1 from when it comes near a pickup position RP until it passes the pickup position RP, and rotates at a circumferential velocity V 2 that is about the same as that of the second conveyer C 2 from when it comes near a hand-over position SP until it passes the hand-over position SP.
- V 1 a circumferential velocity
- V 2 that is about the same as that of the second conveyer C 2 from when it comes near a hand-over position SP until it passes the hand-over position SP.
- the pad 9 i may rotate about a normal direction CL by a predetermined angle (e.g., 90°.) to change the orientation of the article N i while the pad 9 i moves from the pickup position RP to the hand-over position SP.
- the article N i may be a final or intermediate product of a worn article such as a napkin, a disposable diaper, disposable pants or a bandage, or may be a single-layer or multilayer sheet of woven fabric, non-woven fabric, a liquid permeable sheet or a liquid impermeable sheet.
- the intermediate product may be an absorbent or absorbents arranged over a web.
- FIG. 17 illustrates an example of a method for folding a web W using the rotation device 1 .
- each bridging section 7 i includes the pad 9 i for attracting the web W so that the web W can be transferred.
- the pad 9 i attracts the web W while it is moving from the position of the pad 9 1 (where the web W is received) to the position of the pad 9 3 (where a folded web is transferred) in FIG. 17 .
- the rotation device 1 forms a wheel for continuously transferring the web W, and is in contact with the surface of a belt 31 ′ of a conveyer 30 ′ via the web W.
- the rotation device 1 picks up the web W traveling at a first velocity V 11 , and hands it over to the conveyer 30 ′ traveling at a second velocity V 21 (V 11 >V 21 ).
- the belt 31 ′ of the conveyer 30 ′ basically transfers the web W at the circumferential velocity V 21 .
- each pad 9 i rotates at the circumferential velocity V 11 at the position of the pad 9 1 (where the web W is received), and slows down to the circumferential velocity V 21 by the time it reaches the position of the pad 9 3 (where a folded web is transferred). Therefore, the interval between adjacent pads 9 i is shortened while the pads 9 i move from the pickup position RP to the hand-over position SP, thereby slackening the web W between the pads 9 i to form a slack portion W 1 .
- the web W is supplied by being attracted onto the surface of the pad 9 1 at the pickup position RP, and then transferred along the pads 9 i of the rotation device 1 . While the rotation section B′ rotates in the direction of an arrow Vh, the pad 9 1 moves along the guide 3 ′ and in the opposite direction Vs, thereby reducing the interval between the pads 9 i .
- the direction Vs is defined with respect to the guide 3 ′. Therefore, a folded portion W 2 is formed in the web W. After the formation of the folded portion W 2 , the pad 9 4 stops attracting the web W, whereby the web W including folded portions W 2 at a predetermined pitch is transferred onto the conveyer 30 ′, thereby performing a so-called “Z-shaped folding process”.
- the rotation device for performing the Z-shaped folding process may not be the rotation device 1 described above, but may alternatively be, for example, a device described in PCT International Publication WO01/44086, or a device using any other link mechanism.
- FIG. 19A Another example of a folding device for performing the Z-shaped folding process is illustrated in FIG. 19A .
- a rotation device 1 A includes a plurality of pads 9 i . At least one suction hole 10 for attracting the web W is provided in the surface of each pad 9 i .
- the velocity of the pad 9 i is the same as that of the web W at the pickup position RP. However, at the hand-over position SP, the velocity is lower than that at the pickup position RP. Therefore, a slack portion W 1 is formed in the web W.
- the folding device includes a directioning section 12 ′ so as to ensure that the slack portion W 1 is folded in toward the center of the rotation device 1 A.
- the directioning section 12 ′ may be, for example, a mechanism that blows out a stream of air, a mechanism that thrusts the slack portion W 1 of the web toward the center of the rotation device 1 A, or a mechanism that sucks the web W toward the center of the rotation device 1 A by a vacuum.
- a mechanism that blows out a stream of air a mechanism that thrusts the slack portion W 1 of the web toward the center of the rotation device 1 A
- a mechanism that sucks the web W toward the center of the rotation device 1 A by a vacuum may be, for example, a mechanism that blows out a stream of air, a mechanism that thrusts the slack portion W 1 of the web toward the center of the rotation device 1 A, or a mechanism that sucks the web W toward the center of the rotation device 1 A by a vacuum.
- the air blowing mechanism is employed, only one directioning section 12 ′ may be provided, or a plurality of orientation sections 12 ′ may alternatively be
- the width of the directioning section 12 ′ (the length thereof in the direction perpendicular to the surface of the sheet of the figure) can be set to a value (a length in the direction perpendicular to the surface of the sheet of the figure) according to the width of the web W.
- one or more suction holes 11 may be provided on each of the side surfaces of the pads 9 i by which the web W is to be sandwiched, i.e., on the side surfaces of each pad that face the side surfaces of the adjacent pads, so that the slack portions W 1 of the web W are laid down along the side surfaces of the pads 9 i .
- the direction in which the web is to be folded may be the direction in which the web runs or the opposite direction.
- the circumferential velocity of the trailing one of two pads that sandwich the web therebetween is higher than that of a conveyer in the vicinity of the hand-over position SP
- the web is folded by the trailing pad in the running direction.
- the leading pad is only required to move so as not to interfere with the movement of the trailing pad.
- the circumferential velocity of the conveyer is higher than that of the leading pad in the vicinity of the hand-over position SP, the web is folded by the leading pad in the direction opposite to the running direction.
- a side surface of each pad 9 i in the circumferential direction forms a folded portion.
- the side surfaces of two adjacent pads 9 4 and 9 5 that are facing each other in the circumferential direction come close to each other at the hand-over position SP so as to fold in two the web W therebetween, thereby forming the folded portion W 2 .
- An applicator (an example of a fold-holding section) 13 for applying an adhesive such as a hot melt resin may be provided on the receiving side, as illustrated in FIG. 19A .
- the applicator 13 applies an adhesive on one or both of another web Wo and the web W to be folded so as to bond the webs Wo and W together, thereby making it easier to maintain the shape of the folded portion W 2 .
- a conveyer as illustrated in FIG. 20 may be used to maintain the shape of the folded portion W 2 .
- the directioning section 12 ′ may suck in the slack portion W 1 by a stream of air as illustrated in FIG. 20 .
- the suction by the directioning section 12 ′ forms the slack portion W 1 into a shape that is protruding from the rotation device 1 A.
- the suction of the web W, the number of the directioning sections, etc., may be set as those for the device of FIG. 19A .
- the slack portion W 1 of the web is sandwiched between the pad 9 i and the belt 31 ′ of the conveyer 30 ′, thereby forming the folded portion W 2 .
- Another example of the fold-holding section provided on the receiving side may be, for example, a meshed belt 31 ′ of the conveyer 30 ′ capable of sucking an air therethrough by which the folded web W is received, wherein the web W is sucked by an air 100 , as illustrated in FIG. 20 , so as to maintain the shape of the folded portion W 2 .
- a belt 31 ′ including a plurality of holes therein may be used.
- the fold-holding section may alternatively maintain the shape of the slack portion W 1 by using an electrostatic charge, or the like.
- a bellows-shaped folding device for performing a bellows-shaped folding process which is a modified version of the Z-shaped folding process, will be described with reference to FIG. 19B to FIG. 19D .
- the bellows-shaped folding device is capable of folding the slackened web W at a plurality of positions.
- the bellows-shaped folding device includes, in addition to the elements of the folding device of FIG. 19A , a plurality of plates P i between adjacent pads 9 i ⁇ 1 and 9 i . As illustrated in FIG. 19D , the plates P i are pivotally connected to one another and to the pads 9 i via joints J i . For example, the plate P 1 is pivotally connected to the pad 9 i ⁇ 1 via the joint J i , and the adjacent plate P 2 is pivotally connected to the plate P i via the joint J 2 .
- Each plate P i is capable of sucking the web W.
- Each plate P i may include at least one suction hole, through which the web W is sucked. In such a case, each plate P i may be meshed.
- the bellows-shaped folding device may have each plate P i charged with a first charge and the web with another charge that attracts the first charge, so as to attract the web W onto the plate P i .
- the plurality of plates P i that have been in a spread formation are turned into a bellows-like shape.
- the joints J i between the plates P i may restrict the angle by which the connected plates P i can pivot in order to form a predetermined bellows-like shape in the web.
- an elastic member 40 ′ may be provided between the plates P 2 and P 3 as illustrated in FIG. 19D so as to restrict the angle by which the plates P i can pivot.
- the web W attracted onto the plates P i is bent so as to conform with the shape of the plates P i .
- the slackened web W is folded so as to have top portions and bottom portions and is transferred onto the conveyer 30 ′.
- the folded web W may be transferred onto the conveyer 30 ′ after the interval between adjacent pads 9 i ⁇ 1 and 9 i has been shortened and before the interval therebetween reaches its maximum value.
- a triangular prism-shaped wall Tw is formed as illustrated, for example, in FIGS. 22 and 23 .
- FIG. 21 illustrates another example of a folding device.
- a pair of first rolls 21 and 21 having a high transfer speed v 1 are provided upstream, with respect to the transfer direction, along the web W, and a pair of second rolls 22 and 22 having a low transfer speed v 2 are provided downstream along the web W.
- the slack portion W 1 is formed between the first rolls 21 and the second rolls 22 .
- the direction in which the slack portion W 1 is folded is determined by the directioning section 12 .
- the directioning section 12 includes two bars 12 a and 12 b extending in the width direction of the web W. Broken lines in the figure represent the respective traces of the two bars.
- the second bar 12 b moves after the first bar 12 a moves, thereby forming the folded portion W 2 . Since the web W is made of a relatively light material such as non-woven fabric, pulp or a synthetic resin, the web W can easily be supported by the bars 12 a and 12 b with only one end thereof being fixedly supported.
- the second bar 12 b retracts toward the first rolls 21 before it is caught between the second rolls 22 .
- the first bar 12 a can move in the width direction of the web W so as to extend beyond the edge of the folded portion W 2 .
- FIG. 22 illustrates an example of a top sheet of a napkin, in which broken lines represent a web.
- the walls Tw are formed in a top sheet T so as to extend in a direction generally perpendicular to the running direction X of the top sheet T being produced.
- the running direction X being a transverse direction
- elongated walls Tw can be formed along the opposing sides of the napkin.
- FIG. 23 illustrates a top sheet (web) W of a diaper or pants before cutting.
- the walls Tw can be formed in a direction Y transverse to a running direction X of the web Was illustrated in the figure.
- the longitudinal direction Y of the walls Tw is transverse to the running direction X of the web W.
- the longitudinal direction of an absorbent (core) Co denoted by a broken line is transverse to the running direction X of the web W (i.e., the production line is of a so-called “transverse flow” type).
- a diaper or pants in a transverse flow type production by cutting the web W in a direction transverse to the running direction (the X direction) as indicated by a two-dot chain line.
- a liquid impermeable back sheet in addition to the absorbent Co, can be layered on the liquid permeable top sheet.
- the wall Tw may alternatively be formed on the absorbent Co.
- the wall Tw may be formed in the vicinity of an end of the absorbent Co, or a plurality of walls Tw may be formed in the vicinity of the end of the absorbent Co.
- every other folded portion may be folded back in the opposite direction, for example, so as to form the walls Tw illustrated in FIG. 22 and FIG. 23 .
- An elastic member for making the worn article better fit to the wearer may be provided along the wall Tw.
- a mechanism for attaching an elastic member that is extending in the direction Y transverse to the running direction X of the web W onto the web e.g., a widening mechanism as described in Japanese Patent Application No. 12-028945
- the elastic member may be made of at least one flat or cord rubber.
- the wall Tw of a disposable worn article such as a napkin, a diaper or pants as described above may be formed by the bellows-shaped folding process.
- a plurality of top portions and bottom portions may be formed on the absorbent Co through the bellows-shaped folding process. In such a case, excrement is drawn into the bottom portions, thereby reducing a leak from the worn article.
- FIG. 24 is a diagram illustrating an example of a plurality of walls Tw formed on each absorbent Co through the bellows-shaped folding process.
- the walls Tw may be positioned on the absorbent Co directly, or indirectly via a sheet, or the like.
- the sheet may be a continuous sheet, or at least one sheet may be layered between a plurality of walls Tw and an absorbent.
- bottom portions Vw of the walls Tw are preferably flat.
- the area over which the bottom portions Vw of the walls Tw contact the sheet or the absorbent Co is preferably 50% or more of the total area of the sheet or the absorbent Co.
- FIG. 25 is a diagram illustrating a portion of a bellows-shaped folding device 100 for forming bottom portions Vw that are generally flat.
- the bellows-shaped folding device 100 includes a plurality of pads 9 i , at least one dummy pad 101 , and a plurality of generally V-shaped plate pairs 102 .
- Each of the generally V-shaped plate pairs 102 includes two plates P and P, and each plate P is capable of pivoting with respect to the other about the link between the plates P and P.
- One end of each generally V-shaped plate pair 102 is connected to the dummy pad 101 or the pad 9 i .
- At least one of the pads 9 i , the dummy pad 101 and the generally V-shaped plate pair 102 is capable of sucking the web W onto the surface of the plates P and P and the surface of the top portion of the dummy pad 101 .
- the width Wd of the bottom portion of the wall is 1 cm or less, the web W may be sucked by using only the pads 9 i and the generally V-shaped plate pairs 102 .
- the width Wd of the bottom portion of the wall is so small, the web W can be attracted and secured only by suction by the pads 9 i and the generally V-shaped plate pairs 102 .
- the surface configuration of the pads 9 i and the dummy pads 101 is such that the surfaces of the pad 9 i and the dummy pad 101 contact the conveyer when handing over the folded web W to the conveyer.
- a disposable worn article including a web with at least one elastic member attached thereto in an intermittent manner can be produced by employing the “Z-shaped folding process”.
- At least one elastic member is bonded to a web, with a slack portion having been formed therein through the “Z-shaped folding process”, so that the elastic member extends across the slack portion, as illustrated in FIG. 26A .
- the elastic member F is cut off in the vicinity of a position between one edge W 11 of the slack portion W 1 of the web W and the other edge W 12 of the slack portion W 1 .
- the elastic member F may be cut by using a straight cutter or an embossing roll.
- a straight cutter, an embossing roll, or the like, can cut off the elastic member through the application of heat, pressure, or a combination thereof, for example.
- FIG. 26B is a diagram illustrating the web W after cutting off the elastic member F and eliminating the slack.
- the elastic member can be provided on the web W except for a portion W 3 that has been a slack portion.
- FIG. 27 illustrates an example of a device for intermittently introducing an elastic member F between a first web W that has been subjected to the “Z-shaped folding process” and a second web Wo.
- the device applies an adhesive 201 on at least a portion of at least one of the first web and the second web. Then, nip rolls 200 secure the first web W, the elastic member F and the second web Wo with respect to one another.
- the laminate obtained by the nip rolls 200 is passed to an embossing roll 203 .
- the embossing roll 203 is provided with a plurality of protrusions that cut off at least one the elastic member F of the laminate along with a portion of the second web Wo.
- the tip of each protrusion may be sharp as disclosed in U.S. patent application Ser. No. 09/891,034.
- the second web Wo may be provided with a slit at each position corresponding to a slack portion W 1 of the first web W.
- the second web Wo may include a slack portion.
- the first web W, the elastic member F and the second web Wo are bonded together so that the position of the slack portion of the first web W corresponds to the position of the slack portion of the second web Wo.
- Only the elastic member F may be cut off.
- it is possible to cut off only the elastic member F by employing an elastic member F whose melting point is lower than that of the second web Wo and embossing the laminate while heating the embossing roll 203 to a predetermined temperature.
- FIG. 28 is a diagram illustrating an example of a pants-shaped diaper N, which is a disposable worn article, being spread out.
- the pants-shaped diaper N includes an absorbent Co, a front flap 300 and a back flap 301 .
- the front flap 300 and the back flap 301 include a waist gather Fw that closely fits to the wearer around the waist, and a fit gather Fb that fits to the abdominal part of the wearer.
- the fit gather Fb is generally absent in a portion where the pants-shaped diaper and the absorbent Co overlap with each other. If there is an elastic member F in the overlapped portion, the absorbent Co shrinks, thereby deteriorating the comfort to the wearer.
- the front or back flap 300 , 301 can be produced by attaching an elastic member to a web in an intermittent manner by using the “Z-shaped folding process” described above.
- the pants-shaped diaper may include a wall as described above.
- the worn article described above may of course be an article other than a pants-shaped diaper, such as a diaper with adhesive tapes.
- the elastic member described above may be a polyurethane fiber, a natural rubber or a synthetic rubber,
- the polyurethane fiber may be LYCRA® manufactured by E I du Pont de Nemours and Company.
- the elastic member may be in the form of a cord, a string or a net, or have a flat shape.
- Rebound® manufactured by CONWED PLASTICS may be used as a net-shaped elastic member.
- rotation member is provided so as to allow a guide to rotate, with the guide being provided with a plurality of moving sections, whereby each moving section can slide independently. Therefore, the friction between the guide and the moving sections is significantly reduced, and thus it is possible to rotate the moving section continuously over a long period of time. Moreover, a plurality of moving sections can be provided without being spaced apart from one another in the axial direction, whereby the size of the device can be reduced.
- the bridging section is stabilized because the bridging section can then be supported at two positions.
- the folding method or the folding device of the present invention it is possible to easily and efficiently form a folded portion or a wall in a direction transverse to the direction in which the first web is transferred.
- a worn article including a wall formed as described above has different characteristics from those of a worn article having a wall that is parallel to the direction in which the first web is transferred.
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Abstract
A method for producing a wearing article of the present invention includes the steps of: supplying an elastic member; stretching the elastic member; placing the stretched elastic member so that the elastic member spreads across a plurality of first webs divided in a transport direction; making a part of a second web loose in the transport direction while transporting the second web, thereby forming a loose portion; placing the first webs, on which the elastic member is disposed, on non-loose portions before and after the loose portion of the second web; and cutting the elastic member between adjacent first webs of the plurality of first webs.
Description
- The present application is a continuation of commonly assigned, copending application Ser. No. 10/316,523, filed Dec. 11, 2002, and entitled “Method and Apparatus for Producing Wearing Article”, the entire disclosure of which is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a method and apparatus for producing a disposable wearing article such as paper diapers and pants.
- 2. Description of the Related Art
- In the above-mentioned type of wearing articles, in order to form, for example, a waist gathering, an elastic member is placed on a sheet surface. However, such an elastic member allows an absorber to shrink, so that the absorber becomes stiff, degrading a feeling of wearing.
- As a prior art of cutting an elastic member, Japanese Laid-Open Patent Publication No. 2001-224627 discloses a method for interposing a film sheet for gathering between a peripheral surface of an adsorbent roller and a cutter blade of a cutter roller, and cutting the film sheet.
- Furthermore, International publication No WO 00/04855 discloses a method for forming a web loop.
- Japanese Laid-Open Patent Publication No. 63-317576, for example, discloses a movement of a plurality of pads rotating about a predetermined axis while each of the pads changes its velocity, during a process of producing a worn article or a web (a continuous material). Japanese National Phase PCT Laid-Open Publication No. 2000-514024 discloses a material engagement member reciprocating in a direction parallel to a rotation axis of a drum.
- When each of the pads is supported by a bearing, the same number of bearings as the number of pads are required so that the velocities of the pads can be changed individually, thereby increasing the size and/or complexity of the device.
- In view of the problem in the prior art, it is an object of the present invention to provide a rotation device having a simple structure and being capable of providing a complicated movement. It is also an object of the present invention to provide a method for transferring a worn article, a method for folding a web and a device for folding a web that can suitably employ the rotation device, and a disposable worn article produced by using the same.
- In order to achieve the objects set forth above, a first rotation device of the present invention includes: an endless guide; a plurality of moving sections that slide while being guided by the guide; and a rotation member that allows the guide to rotate about an axis. In addition, the plurality of moving sections are arranged in the rotation allowance direction of the rotation member; and the plurality of moving sections can slide in the direction of rotation of the rotation member or in the opposite direction by being guided by the guide.
- A second rotation device of the present invention includes: a plurality of guides; a plurality of moving sections that slide while being guided by the plurality of guides; and a rotation member that allows the plurality of guides to rotate about an axis. Furthermore each of the moving sections is guided by at least one of the guides; and the plurality of guides is provided about the axis so as to be arranged in the rotation allowance direction of the rotation member while surrounding the axis, so that the plurality of moving sections can slide in the direction of rotation of the rotation member or the opposite direction.
- As a rotational force having a predetermined velocity curve is applied to the moving sections, the rotation member rotates at a high velocity along with the rotation of the moving sections. Meanwhile, each moving section rotates with respect to the guide at a low relative velocity. In this way, the friction between the moving sections and the guide is significantly reduced, thereby improving the durability of the device.
- Ideally, the rotation member is capable of an unlimited rotation, and may be a ball bearing or a roller bearing including a rolling element such as a ball or a roller.
- The guide may be any type of guide as long as it allows the sliding movement of the moving sections in a direction including a component of the rotation allowance direction of the rotation member. The term “endless guide” as used herein refers to not only a generally completely ring-shaped guide, but also to those having slight gaps in the circumferential direction, or even to those obtained by arranging guide elements, which together form one guide, so as to be spaced apart from one another at a predetermined interval. Moreover, the guide elements may overlap with one another as viewed in the axial direction. The phrase “in a direction including a component of the rotation allowance direction of the rotation member” as used herein means that a guide element may be provided in an inclined direction. The guide element may be a rail or a groove.
- In the second rotation device of the present invention, the phrase “a plurality of guides” means that the guides are spaced apart from one another in the direction of rotation or in the axial direction to such a degree that a moving section cannot move from one guide to another.
- Where one moving section moves from one of a plurality of guide elements to another, the plurality of guide elements together form one guide.
- In the present invention, it is preferred to provide a controller for controlling the moving velocity of the moving sections. Such a controller causes the moving sections to rotate at differing predetermined instantaneous velocities, thereby changing the pitch between the moving sections during rotation.
- The term “instantaneous velocity” as used herein refers to a velocity in a minute period of time, meaning that each moving section rotates while changing its velocity depending on the rotational position thereof.
- The present invention can be used with a rotation device as described in PCT International Publication WO01/44086, a method for transferring worn articles while changing the pitch thereof, a method for folding a web, or a device for folding a web.
- A method for folding a web of the present invention is a method for folding a web by using a rotation device including a plurality of pads that rotate about a predetermined axis so as to continuously transfer the web. The method includes: supplying the web onto surfaces of the rotation device pads; rotating adjacent ones of the pads onto which the web has been supplied so as to change the interval therebetween to slacken a portion of the web between the adjacent pads, thereby folding the portion of the web; and releasing the web from the pads.
- Such a folding method can be realized using the first or second rotation devices of the present invention. Other rotation devices such as that described in PCT International Publication WO01/44086 may be used in place of the rotation device including a plurality of pads.
- A device for folding a web of the present invention is a device for folding a web to form a wall in a direction transverse to a web running direction. The device includes: a transfer member for forming a slack portion in the web in the running direction thereof while continuously transferring the web; and a member for folding the slack portion so as to form the wall.
- The term “wall” as used in the present invention refers to a portion of a web or a sheet-like material that has been folded, regardless of whether the wall is laid down along the surface of the web or standing on the web.
- In the folding device of the present invention, the “transfer member” may be any member including a plurality of transfer sections for transferring the web in the web running direction, wherein the transfer velocity of one of the transfer sections is set to be lower than that of another transfer section upstream of the one of the transfer sections so as to form a slack portion in a portion of the web between the upstream and downstream transfer sections.
- In the present invention, it is preferred to provide a directioning member for defining the direction in which a slack portion is to be folded.
- In the present invention, the term “slack portion” refers to a portion of a web on which no tension is applied.
- In the present invention, it is preferred to provide a fold-holding section for maintaining the shape or condition of a folded portion obtained by folding the slack portion.
-
FIG. 1 is a side layout view of an apparatus for producing a wearing article of Embodiment 1 according to the present invention. -
FIG. 2 is a side layout view illustrating the steps of cutting an elastic member in the apparatus shown inFIG. 1 . -
FIG. 3A is a perspective view of a stack in a state before the elastic member is cut, andFIG. 3B is a perspective view of a stack in a state after the elastic member is cut. -
FIG. 4A is a front view showing the stack in which the elastic member interposed between webs is cut, andFIG. 4B is a front view showing a wearing article. -
FIGS. 5A and 5B are partial side views showing a circumferential velocity of pads. -
FIG. 6 is a side layout view showing an apparatus for producing a wearing article of Embodiment 2 according to the present invention. -
FIG. 7 is a front view showing webs in a state where the elastic member is placed. -
FIG. 8 is a front view showing webs in a state where an absorber is attached. -
FIG. 9A shows webs whose both edges are bent, andFIG. 9B shows webs folded into two. -
FIGS. 10A to 10F are front views illustrating a method for placing a second elastic member. -
FIGS. 11A to 11C show an example of cutting the elastic member with a cutting machine, andFIG. 11D shows another cutting machine. -
FIG. 12 shows diapers obtained by cutting the elastic member so that a trim is not generated, and shifting the phase of one web thus cut by substantially ½ from the other web. -
FIG. 13A is a schematic cross-sectional view illustrating a first embodiment of the rotation device of the present invention. -
FIG. 13B is a side view illustrating the first embodiment of the rotation device of the present invention. -
FIG. 14A is a schematic cross-sectional view illustrating a second embodiment of the rotation device of the present invention. -
FIG. 14B is a side view illustrating a portion of a fixed pin and groove arrangement for controlling a rotational velocity of a bridging section according to the second embodiment of the invention. -
FIG. 15A is a schematic cross-sectional view illustrating a third embodiment of the rotation device of the present invention. -
FIG. 15B is a schematic perspective view illustrating an example where a plurality of guides are provided in a concentric manner. -
FIG. 15C is a schematic perspective view illustrating another example where a plurality of guides are provided so as to be spaced apart from each other in the axial direction of an axis O. -
FIG. 16 is a schematic side view illustrating a transfer device. -
FIG. 17 is a schematic side view illustrating a folding device. -
FIG. 18A is a perspective view illustrating an example of a guide and a moving section. -
FIG. 18B is a perspective view illustrating another example of a guide and a moving section. -
FIG. 19A is a schematic view illustrating a variation of a folding device. -
FIG. 19B is a diagram illustrating plates between two pads being in a spread formation. -
FIG. 19C is a diagram illustrating plates being folded into a bellows-like shape. -
FIG. 19D is an enlarged view illustrating plates between two pads. -
FIG. 20 is a schematic diagram illustrating another variation of a folding device. -
FIG. 21 is a schematic diagram illustrating another embodiment of a folding device. -
FIG. 22 is a perspective view illustrating an example of a top sheet. -
FIG. 23 is a perspective view illustrating an example of a top sheet before cutting. -
FIG. 24 is a perspective view illustrating another example of a top sheet before cutting. -
FIG. 25 is a diagram illustrating a portion of another example of a bellows-shaped folding device. -
FIG. 26A is a diagram illustrating an elastic member being introduced so as to extend across a slack portion that has been obtained through a “Z-shaped folding process”. -
FIG. 26B is a diagram illustrating a web after cutting off the elastic member and removing the slack. -
FIG. 27 is a diagram illustrating an example of a device for intermittently introducing an elastic member between a first web that has been subjected to a “Z-shaped folding process” and a second web. -
FIG. 28 is a diagram illustrating an example of a pants-shaped diaper, which is a disposable worn article, being spread out. - Hereinafter, the present invention will be described by way of illustrative embodiments with reference to the drawings.
- FIGS. 1 to 5A-
B show Embodiment 1. - An apparatus for producing a wearing article shown in
FIG. 1 is capable of providing a web with looseness and intermittently placing an elastic member on at least a part of the web. For example, the apparatus for producing a wearing article includes arotation apparatus 1 capable of providing a second web W2 with looseness and asecond roller 12 capable of placing an elastic member F on portions of the second web W2 other than those which are loose. When the elastic member F extending across a loose portion of the second web W2 is cut with at least one of a laser, an industrial light, a blade, and scissors, the apparatus can intermittently place the elastic member F on the second web W2. This intermittent placement is mainly caused by the looseness of the second web W2. Hereinafter, the configuration and operation of therotation apparatus 1, thesecond roller 12, and the like will be described. - In
FIG. 1 , asupply apparatus 3 of the elastic member F supplies the elastic member F to the surface of afirst roller 11. The elastic member F on thefirst roller 11 is fed to thesecond roller 12. A circumferential velocity V2 of thesecond roller 12 is set to be larger than a circumferential velocity V1 of thefirst roller 11. Therefore, the elastic member F is stretched between thefirst roller 11 and thesecond roller 12. - The
second roller 12 is supplied with a first web W1. Thesecond roller 12 transports the first web W1 while sucking the first web W1 by vacuum suction or the like. On the surface of thesecond roller 12, for example, a number of suction holes 12 a for sucking the first web W1 may be provided. After the first web W1 is sucked to be held on the surface of thesecond roller 12 by vacuum suction or the like, the first web W1 is divided into a predetermined size with aweb cutter 2. In this division, the first web W1 may be cut or half-cut to a predetermined length in a transport direction. In the case where the first web W1 is half-cut, the first web W1 may be cut to a predetermined length together with the elastic member F in a subsequent step or cut in a predetermined length when an interval of pads is increased. After this division, the elastic member F is placed so as to spread across the surface of the respective first webs W1. In the case where the elastic member F is made of thread rubber or flat rubber, an adhesive is applied to at least one of the elastic member F, the first web W1, and the second web. - It may also be possible that after the elastic member F is placed on the first web W1, the elastic member F is cut together with the first web W1. Furthermore, in the case where the elastic member F is made of hot-melt resin, molten resin discharged from the
supply apparatus 3 is cooled by thefirst roller 11. The molten resin may be cooled with cool water. Furthermore, thefirst roller 11 may be a porous roller. In the case where thefirst roller 11 is a porous roller, thefirst roller 11 may be configured so that air is discharged from the inside of thefirst roller 11 through holes. Due to the air, the hot-melt resin becomes unlikely to adhere to the roller. When the air is discharged from the porous body, the volume of the air is increased to cool the roller. Thus, the hot-melt resin can be cooled. The porous roller may be formed by sintering stainless ball or the like. - Furthermore, it may also be possible that the
first roller 11 is provided with grooves or the like, whereby resin is molded. For example, mesh-shaped (for example, lattice-shaped) grooves are formed on thefirst roller 11, and hot-melt resin is applied to the grooves of thefirst roller 11 with a coater or the like, whereby a mesh-shaped elastic member is formed. - When hot-melt resin having a softening point lower than that of Lycra® is used as the elastic member, the subsequent cutting step becomes easier, compared with the case of using Lycra®.
- The hot-melt resin may be a kneaded composition and may comprise a thermoplastic resin, tackifier, viscosity adjuster, antioxidant, heat stabilizer, ultraviolet radiation absorbent, bulking agent, elasticizer, and the like. The thermoplastic resin may include elastomers such as olefins {EVA (ethylene-vinyl acetate copolymer), APAO (amorphous-poly-α-olefin)}, rubbers {SIS (styrene-isoprene-styrene copolymer), SBS (styrene-butadiene-styrene copolymer), SEBS (styrene-ethylene-butadiene-styrene copolymer), SEPS (styrene-ethylene-propylene-styrene copolymer)}, polyamides and polyesters. The thermoplastic resin may be a single elastomer or a blend of more than one elastomer.
- The
rotation apparatus 1 for folding is placed in the vicinity of thesecond roller 12. Therotation apparatus 1 has a plurality ofpads 9 capable of sucking the second web W2 and transporting it. On the surface of apad 9 i, suction holes 10 for sucking the second web W2 are provided. Therotation apparatus 1 continuously transports the second web W2, and is in contact with the surface of thesecond roller 12 via the first web W1, the elastic member F, and the second web W2 at a contact point O (predetermined position). Thereafter, the following may also be possible: an additional roller and thepad 9 i sandwich the first web W1, the elastic member F, and the second web W2 placed on thepad 9 i, whereby the contact therebetween is enhanced. - The elastic member F is cut after being interposed between the first web W1 and the second web W2. The elastic member F is fixed between the webs W1 and W2, so that the elastic member F shrinks less, compared with the case where the elastic member F is placed on one web.
- The
rotation apparatus 1 receives the second web W2 at a circumferential velocity V11 at a receiving position RP. At a point “A” where thepad 9 i receives the second web W2, the circumferential velocity of the pad is V11.FIG. 5A is a side view showing the enlarged vicinity of the point “A” ofFIG. 1 . During a period from a time when at least a part of thepad 9 i+1 shown inFIG. 5A receives the second web W2 to a time when at least a part of thepad 9 i adjacent to thepad 9 i+1 receives the second web W2, thepad 9 i+1 moves at a substantially constant circumferential velocity V11. The reason for this is to prevent the second web W2 from being damaged. - Each
pad 9 i of therotation apparatus 1 is rotated at the receiving position RP at the circumferential velocity V11, and decelerates to a circumferential velocity V21 before reaching the contact point O (where the distance between thepad 9 i and thepad 9 i+1 becomes minimum). Therefore, the interval between thepad 9 i and thepad 9 i+1 becomes narrow before thepad 9 i moves from the receiving position RP to the contact point O. This causes the second web W2 to become loose between thepad 9 i and thepad 9 i+1, whereby a loose portion Wa is formed. - The
pad 9 i comes into contact with thesecond roller 12 via the second web W2 and the like at the circumferential velocity V21 (V11>V21) at the contact point O shown inFIG. 1 . The first web W1 is transferred from thesecond roller 12 at the circumferential velocity V2. The circumferential velocity V21 of thepad 9 i is set at a substantially constant velocity equal to or close to the circumferential velocity V2 of thesecond roller 12. That is, while at least thepad 9 i is in contact with thesecond roller 12 via the second web and the like or at least thepad 9 i places the first web W1 on the second web W2, thepad 9 i moves at the substantially constant circumferential velocity V21 substantially equal to V2. In other words, during a period from a time when the second web W2 on thepad 9 i starts receiving the first web W1 to a time when the second web W2 finishes receiving it, thepad 9 i moves the constant circumferential velocity V21 (≈V2). The difference in velocity prevents the first web W1 and the second web W2 from being shifted from each other, and exactly places the first web W1 at a predetermined position of the second web W2. - The circumferential velocity of the
pad 9 i+1 becomes V31 at a point B where thepad 9 i+1 releases the second web W2.FIG. 5B is a side view showing the enlarged vicinity of the point B. Thepad 9 i moves at a substantially constant circumferential velocity V31 at least during a period from a time slightly before thepad 9 i+1 adjacent to thepad 9 i releases the second web W2 to a time when thepad 9 i releases the second web W2 (FIG. 5B ). The reason for this is to minimize the fluctuation in velocity of the released second web W2. For example, in the case where the circumferential velocity of anembossing roller 5 is V3, the circumferential velocity V31 becomes substantially equal to V3. - When or after the circumferential velocity of the
pad 9 i becomes maximum in the vicinity of the point A inFIG. 5A , thepad 9 i receives the second web W2. If thepad 9 i receives the second web W2 before the circumferential velocity of thepad 9 i becomes maximum, the interval between adjacent pads is increased, which may damage the second web W2. As the operation of thepad 9 i, thepad 9 i may move at a maximum circumferential velocity, for example, during a period from the point B to the point A. In this case, a region from the point B to the point A can be dealt with as one region. That is, in the present embodiment, the circumferential velocity of the pad may become substantially constant at least at two points. - It is preferable that the apparatus is provided with a directing part so that the loose portion Wa in
FIG. 1 becomes loose exactly toward the center of therotation apparatus 1. - The directing part may be, for example, a mechanism for jetting air or a mechanism for pushing the loose portion Wa of the web toward the center of the
rotation apparatus 1. Alternatively, the directing part may be a mechanism for sucking the web W toward the center of therotation apparatus 1 by vacuum suction. In the case where the directing part is a mechanism for jetting air, one or a plurality of directing parts may be provided. Furthermore, in the case where the directing part is a mechanism for pushing the loose portion Wa, one or a plurality of directing parts may be provided. By providing a plurality of directing parts, the loose portion Wa can be bent exactly toward the center of therotation apparatus 1. In the present embodiment, the loose portion Wa may have a shape dented toward the center of therotation apparatus 1 due to the weight of the second web W2. - Next, a folding operation will be described. When the second web W2 is sucked to be held on the surface of the
pad 9 1 at the receiving position RP, the second web W2 is transported along thepad 9 1 of therotation apparatus 1. When thepad 9 1 is rotated from the receiving position RP to the contact point O, the interval between thepads 9 i is decreased. Because of this, the loose portion Wa is formed in the second web W2. Furthermore, the loose portion Wa is folded into two to form a folded portion Wb. - The rotation apparatus for conducting the above-mentioned “folding” is not limited to the
rotation apparatus 1. For example, an apparatus described in Japanese Patent Application No. 2001-545183 A may be used. The present invention is intended to place an elastic member intermittently on a web. Therefore, the second web W2 is not necessarily folded completely. Furthermore, depending upon the shape of thepad 9 i, the second web W2 may have a loop shape. - The folded second web W2 is attached to be stacked on the first web W1 at non-folded portions We before and after the folded portion Wb. That is, the elastic member F is not cut until the elastic member F is placed and fixed between the first web W1 and the second web W2. Therefore, the stretched elastic member F hardly shrinks on the second web W2. When the second web W2 is stacked on the first web W1, the first web W1 is not placed on the folded portion Wb folded between the
pads pads FIG. 2 , only the elastic member F is exposed as shown inFIG. 3A . - As shown in
FIG. 1 , during β from a time when the first web W1 is attached to the second web W2 to a time when the first web W1 is received, suction of air through the suction holes 12 a of thesecond roller 12 may be stopped or air may be discharged through the suction holes 12 a. The purpose of this is to attach the first web W1 to the second web W2 smoothly. - The exposed elastic member F in
FIG. 3A is cut with a cutter. In the case where the elastic member F can be cut with a light cutter, alight cutter 4 shown inFIG. 2 is used. Thelight cutter 4 has a rotatable cover, and aslit 42 is formed at a part of the cover. Thecover 41 with theslit 42 is rotated, whereby infrared rays are radiated intermittently from alight source 40 to the elastic member F to cut it at a predetermined pitch. When the elastic member F is cut with thelight cutter 4, there is no possibility that the webs W1 and W2 are damaged by heat from thelight cutter 4, since the elastic member F is away from the loose portion Wa. The elastic member F may be cut with a pressure, heat, UV-rays, a laser or at least two of them. Furthermore, the elastic member F may be cut with an ultrasonic wave. - Hereinafter, an example of cutting the elastic member F with a cutter will be described.
FIG. 11A is a view showing a cuttingmachine 43 that is an example of a cutter. The cuttingmachine 43 has arotatable roller 44 and at least one ofblade 45 placed at theroller 44. The distance between the rotation center of theroller 44 and the center of therotation apparatus 1 is hardly changed. Theblade 45 can cut the elastic member F positioned on the loose portion Wa between thepads 9 i and thepad 9 i+1, when theroller 44 is rotated. The rotation of theroller 44 is changed in accordance with the rotation of at least one of thepad 9 i and thepad 9 i+1. The blade (s) 45 may have a linear shape (FIG. 11B ) or may be in a jagged shape (FIG. 11C ). Furthermore, theblade 45 may be reciprocated in the direction of the rotation axis. -
FIG. 11D shows another cuttingmachine 46. The cuttingmachine 46 includes a rotatable large roller 47, a rotatablesmall roller 48 attached to the large roller 47, and ablade 49 placed at thesmall roller 48. Theblade 49 of the cuttingmachine 46 can cut the elastic member F positioned on the loose portion Wa between thepad 9 i and thepad 9 i+1, when the large roller 47 and thesmall roller 48 are rotated. The rotations of the large roller 47 and thesmall roller 48 are changed in accordance with the rotation of at least one of thepad 9 i and thepad 9 i+1. As shown inFIG. 11D , when theblade 49 reaches the bottom dead point, the tip end of theblade 49 is preferably directed to the center of therotation apparatus 1. Furthermore, in the same way as in theblade 45, theblade 49 may have a shape as shown inFIG. 11B or 11C, and may be reciprocated in the direction of the rotation axis of the large roller 47 or thesmall roller 48. - The
small roller 48 of the cuttingmachine 46 may have a plurality ofblades 49 as shown inFIG. 11E . Theblades 49 may be reciprocated in the direction of the rotation axis to cut the elastic member. - The
rotation apparatus 1 may be provided with scissors instead of the cutting machine. After the second web W2 is stacked on the first web W1, and the interval between thepad 9 i and thepad 9 i+1 is slightly increased, the scissors may enter between thepad 9 i and thepad 9 i+1 to cut the elastic member stretched between thepad 9 i and thepad 9 i+1. The scissors may enter between thepad 9 i and thepad 9 i+1 in accordance with the rotation of at least one of thepad 9 i and thepad 9 i+1. In order for the scissors to perform such an operation, at least one of a cam mechanism and a link mechanism may be used. - In
FIG. 1 , the circumferential velocity of thepad 9 3 becomes a velocity V31 (V31>V21) at a releasing position SP where thepad 9 3 releases the second web W2. Therefore, the interval between thepads light cutter 4 in this state, cutting becomes easy. At the releasing position SP, a stack N1 inFIG. 3B , in which the webs W1 and W2 and the elastic member F are stacked, is in the state before the folded portion Wb is folded. - Herein, during α from the releasing position SP to the receiving position RP, suction through the suction holes 10 may be stopped, and air may be discharged through the suction holes 10. The purpose of this is to smoothly transfer the stack N1 in a downstream direction.
- As shown in
FIG. 1 , anembossing roller 5 may be provided downstream from the releasing position SP. The stack N1 inFIG. 3B is sent to theembossing roller 5. A plurality ofconvex portions 51 are arranged on theembossing roller 5, and at least the elastic member F of the stack N1 is cut with theconvex portions 51. Because of this, as shown inFIG. 4A , the stack N1 is obtained in which the shrinking force of a part of the elastic member F interposed between the first and second webs W1 and W2 is suppressed. An adhesive is not basically applied to a portion CP where the shrinking force of the elastic member F is suppressed by theembossing roller 5. The reason for this is to protect the shrinking of the elastic member F. However, in order to control the shrinking of the elastic member F, some adhesive weaker than usual may be applied. - A portion represented by a solid line in
FIG. 4B shows an example of a disposable diaper produced by the production method of the present invention. In the stack N1, at least a part of an absorber C is fixed at the portion Wb of the stack N1 where the elastic member F is not placed. The other end of the absorber C is connected to another stack N2 represented by a broken line. The absorber C is folded into two, and the portion CP of the stack N1 comes into contact with a corresponding portion of another stack N2, whereby continuous disposable diapers can be produced. Another stack N2 may have the same configuration as that of the stack N1. Furthermore, in the case where the absorber C is folded into two, and the portion CP of the stack N1 comes into contact with the corresponding portion of another stack N2, whereby the stacks N1 and N2 are stretched in a flow direction, even if the elastic member F is placed at the portion CP, the above connection can be conducted. - Furthermore, the following may also be possible: when the elastic member F is cut so that a trim is not generated as shown in
FIG. 12 , and the phase of one web thus cut is shifted by substantially ½ from the other web, whereby the web W2 shown inFIG. 4B is formed. As a method for shifting a phase, one web may be allowed to pass through a dummy roller to cause a delay from the other web. - Next,
Embodiment 2 will be described. A production apparatus shown inFIG. 6 is capable of placing at least three kinds of elastic members F1 to F3 for a leg gathering on a wearing article, as shown inFIG. 9A . - First, as shown in
FIG. 7 , the configuration and operation of the present apparatus for obtaining an arrangement state of elastic members, in which first and second elastic members F1 and F2 are placed on webs W1 and W2, will be briefly described. - The present apparatus includes a
first roller 11 for placing a firstelastic member 1 for a waist gathering and aguide unit 23 for placing a secondelastic member 2 for a leg gathering. Theguide unit 23 is capable of arranging the second elastic member F2 for a leg gathering in a curved shape or a linear shape by being reciprocated in the axis direction of asecond roller 12 with, for example, a cam or a servo motor. U.S. patent application Ser. No. 10/095,959 discloses an example of theguide unit 23. The second elastic member F2 may be cut mechanically with scissors, a blade, or the like provided at the roller.FIGS. 11A to 11D show examples of a cutter. The first elastic member F1 may not be a thermoplastic elastic member. In this case, the first elastic member F1 can be cut with scissors, a blade, or the like in the same way as in the second elastic member F2. Furthermore, the first and second elastic members F1 and F2 may be cut with the same scissors, blade, or the like. In the steps until here inEmbodiment 2, the other configuration is the same as that ofEmbodiment 1. Like parts are denoted with like reference numerals, and the detailed description and drawings are omitted here. - After being interposed and fixed between the first and second webs W1 and W2, the first and second elastic members F1 and F2 are cut to be arranged as shown in
FIG. 7 . - In some disposable wearing articles, an elastic member for a leg gathering is placed on a crotch portion. Therefore, such a portion contrasts to cause an unsatisfactory feeling during wearing. In order to avoid this, the elastic member on the crotch portion is cut so as to shrink, whereby the elastic member on the crotch portion can be made short to some degree. However, it is impossible to completely eliminate the elastic member on the crotch portion, so that an unsatisfactory feeling may still remain.
- In contrast, when the second elastic member F2 for a leg gathering is placed as shown in
FIGS. 10A , 10C, and 10E, the second elastic member F2 can be eliminated from the crotch portion G.FIGS. 10A , 10C, and 10E show the second elastic member F2 interposed between the first web W1 and the second web W2 onadjacent pads 9, wherein a part of the web W2 is interposed between theadjacent pads 9. - For example, as shown in
FIGS. 10A and 10 c, a folded portion Wb is formed on the crotch portion G of the first web W1, and the second elastic member F2 is placed on non-folded portions Wc. Thereafter, the second elastic member F2 striding across theadjacent pads 9 is cut. As a result, the second elastic member F2 is not placed on the crotch portion G, as shown inFIGS. 10B and 10D . - Furthermore, as shown in
FIG. 10 e, when a non-coated portion Df with no adhesive applied thereto is provided in the non-folded portion Wc adjacent to the vicinity of the folded portion Wb, after the second elastic member F2 is cut, a portion of the second elastic member F2 that is not sufficiently attached to the non-folded portion Wc shrinks (FIG. 10F ). Full-circle pants may be produced by such adjustment of an adhesive. Some adhesive may be applied to the non-coated portion Df. In this case, the second elastic member F2 shrinks slowly without being fixed to the non-folded portion Wc, and finally, the second elastic member F2 can be eliminated from the crotch portion G. - The adhesive only needs to be applied to a portion where the second elastic member F2 is placed. As a coating method, an adhesive may be applied in an annual shape to at least one of the first and second webs W1 and W2 with a coater or the like. Furthermore, guns with a plurality of valves are placed in a direction across the first web W1 so that opening/closing of the valve may be controlled by the flow speed of at least one of the first web W1 and the second web W2 and the coating shape. In the case of using such guns, an adhesive can be applied in arbitrary regions partitioned in a matrix.
- An absorber C is arranged and attached to the webs W1 and W2 in the above-mentioned arrangement state of the elastic members by a
turn apparatus 30. Thereafter, a third elastic member F3 for a waist gathering is placed to form an attachment state of an absorber as shown inFIG. 8 . - The
turn apparatus 30 is provided with a plurality ofsuction pads 30 p around a drum (not shown). Thesuction pads 30 p are rotated in an arrow direction while changing the posture of the absorber C by 90° by turning. As theturn apparatus 30, for example, an apparatus as disclosed by International Publication No. WO 01/44086 or U.S. Patent Application Publication No. US 2002/0103468 may be used, as is described in more detail below. - Thereafter, the webs W1 and W2 with the absorber attached thereto have their folding portions E on both edges folded inward at a position of two-dot dash lines L2 shown in
FIG. 8 by afolding apparatus 31. After both edges of the webs W1 and W2 are folded, a leg hole Lh is cut out with a leg hole cutter 32 (FIG. 6 ), whereby a both-edge folded state shown inFIG. 9A is formed. Theleg hole cutter 32 may be placed upstream from theturn apparatus 30. In such a configuration, it also becomes possible to produce a disposable wearing article in which a part of the absorber C extends out to the leg hole Lh portion. - After folding, the webs W1 and W2 are folded into two at a folding line B by a two-folding
apparatus 33, whereby the webs W1 and W2 are folded into two as shown inFIG. 9B . As the two-foldingapparatus 33, for example, an apparatus described in U.S. Pat. No. 3,828,367, U.S. Pat. No. 5,711,832, or U.S. patent application Ser. No. 10/147,644 may be used. - Thereafter, the webs W1 and W2 folded into two have both edges L sealed (e.g., heat-sealed or sonic-sealed), as shown in
FIG. 9B . Thereafter, a cutting portion D represented by a two-dot dash line is cut to form an individual disposable wearing article, e.g., pants P. - The present apparatus may form pants P from the webs W1 and W2 (hereinafter, referred to as a “stacked web W”) folded into two, using a decelerating
drum 34, amain drum 37, aseal roller 35, and acutter roller 36. - As described above, although the web W has an elastic member, the web W is moved in a stretched state so that placement of an absorber at a predetermined position, formation of a leg hole, and other processing can be performed easily. However, in order to seal the web W and cut a seal portion, the position of the edge L only needs to be determined. This is because the state of the other portions of the web W does not influence a sealing step and a cutting step. Furthermore, in the sealing step, it is preferable that a flow speed of the web W is lower so as to obtain a sufficient time for melting a part of the web W and the like. The decelerating drum can decrease the flow speed of the web W so as to obtain a sufficient time for melting the part of the web W and the like. As the decelerating
drum 34, an apparatus described in JP 63-317576 A, International Publication No. WO 01/44086, or U.S. Patent Application Publication No. 2002/0103468 may be used. - The decelerating
drum 34 is provided with a plurality of pads 34 p rotating in a transport direction of the stacked web W around a drum (not shown). The deceleratingdrum 34 receives at least an edge L at a receiving position RP from the two-foldingapparatus 33 placed upstream therefrom, and holds it. The other portions of the web W are positioned between adjacent pads 34 p. The edge L is transported to a releasing position SP, and thereafter, the edge L is supplied to themain drum 37 placed downstream therefrom at the releasing position SP. While the pad 34 p moves from the receiving position RP to the releasing position SP, the interval between the adjacent pads 34 p is changed to be narrow. - The pad 34 p is capable of receiving the edge L in a stretched state at the receiving position RP, and keeping holding the edge L shown in
FIG. 9B . For example, the edge L may be held by sucking the edge L, pressing the edge L with a hook, or fixing the edge L with a pin placed at the pad 34 p. On the other hand, the interval between the adjacent pads 34 p, which has been increased at the receiving position RP, is decreased before the releasing position SP, and a shrinking portion S excluding the edge L shrinks in a transport direction X. In order to allow the edge L to be exactly held, the shrinking force of the elastic member positioned at the edge L may be weakened by anembossing roller 38. For example, theembossing roller 38 can cut the elastic member to a predetermined length or change the elastic configuration of the elastic member by using at least one of heat and pressure. As theembossing roller 38, for example, an apparatus described in U.S. Patent Application Publication No. 2002/0103468 may be used. Theembossing roller 38 is placed in a region from therotation apparatus 1 to the two-foldingapparatus 33. - The
main drum 37 receives the web W in a mixed state where the stretched edge L and the shrinking portion S that has shrunk are present alternately from the deceleratingdrum 34. Themain drum 37 transports the web W in such a mixed state. In order to keep the mixed state, themain drum 37 may be provided with, for example, a plurality of suction holes to suck air through the suction holes so as to suck the web W. - The
seal roller 35 can conduct heat-sealing by heating and pressing the edge L (FIG. 9B ) of the web W. More specifically, the web W is pressed by being interposed between theseal roller 35 and themain drum 37, and heated by theseal roller 35. Theseal roller 35 may be provided with, for example, a heater so as to heat-seal the edge L. Furthermore, theseal roller 35 may have a horn to conduct sonic-sealing. The web W subjected to the above-mentioned heat-sealing is cut to individual pants P by acutter roller 36 placed downstream therefrom. - Next, an operation of forming pants P from the stacked web W will be described. The decelerating
drum 34 continuously receives the web W onto each pad 34 p under the condition that the web W is stretched in a flow direction. Herein, the pad 34 p holds the edge L (FIG. 9B ) of the web W in a stretched state. - After receiving the web W, the pad 34 p having received the web W has its circumferential velocity decreased, whereby the interval between the adjacent pads 34 p becomes narrow. Therefore, a portion S other than the edge L of the web W shown in
FIG. 9B shrinks in a transport direction X to form the shrinking portion S. On the other hand, the edge L is held in a stretched state. - Thereafter, the
main drum 37 receives the web W from the deceleratingdrum 34. At this time, themain drum 37 receives the web W in a mixed state where the edge L in a stretched state and the shrinking portion S that has shrunk are present alternately. Themain drum 37 transports the web W in a downstream direction while keeping the mixed state. During transportation by themain drum 37, theseal roller 35 presses and heats the edge L of the web W on themain drum 37. Herein, a part of the web W shrinks, so that the transport velocity of the web becomes low. Sealing can be conducted exactly, as the transport velocity of the web W is low. - Thereafter, the web W is cut to individual pieces with a
cutter roller 36 to form pants P. - As described above, according to the present invention, after being interposed and fixed between a first web and a second web, an elastic member is cut. Therefore, the stretched elastic member hardly shrinks on the second web, whereby an expected gathering is obtained.
- Furthermore, according to the present invention, the elastic member is cut between adjacent first webs. Therefore, the second web and an absorber do not become stiff between the first webs.
- Furthermore, a plurality of first webs are placed on a second web under the condition where they are away from each other. Therefore, the first web is not stacked on a portion where a gathering of the elastic member is not formed, so that such a portion becomes thin and allows air to pass therethrough. As a result, a user wearing such an article is not likely to feel stuffy.
- Furthermore, the elastic member is cut between the first webs and at a loose portion of the second web. Therefore, only the elastic member can be cut without damaging the web.
- If a pad that makes the second web loose is allowed to transport the second web at a substantially constant velocity during a predetermined period from a time when the pad starts receiving the first web to a time when the pad finishes receiving it, the first web can be transferred to a predetermined posit ion of the second web exactly.
- Furthermore, if the elastic member is cut under the condition that the tension stress of the elastic member is increased, the elastic member can be cut easily with infrared rays or the like.
- Furthermore, while the web is transported under the condition that an edge (where the web is stretched) and a shrinking portion (where the web shrinks) are present alternately in a transport direction, a heating time for heating the edge becomes long. Therefore, the transport velocity of the web can be increased without impairing the exactness of heat-sealing.
- Referring now to
FIGS. 13A-28 , further detail regarding the rotation apparatus or device will be described as originally set forth in U.S. Patent Application Publication No. US 2002/0103468. -
FIG. 13A andFIG. 13B illustrate an embodiment of the present invention. - A
rotation device 1 includes a rotation section B, aguide 3′ and a plurality of movingsections 4 1 to 4 n. In the present embodiment, therotation device 1 also includes adriving section 2′. - The
driving section 2′ inputs a rotational force to the movingsections 4 i. A rotational force from a rotational power source such as a motor is transmitted to thedriving section 2′ via apower transmission portion 5′ and ashaft 20, so that thedriving section 2′ rotates about an axis O at a constant velocity, for example. Thedriving section 2′ is axially and rotatably supported by adrum 6 via a bearing B1. The axis O of thedriving section 2′ is eccentric to an axis C of thedrum 6. Due to such an eccentric structure, it is possible to, for example, periodically change the velocity of each movingsection 4 i while thedriving section 2′ rotates. - A
guide 3′ is attached to thedrum 6 via the rotation section B′ such as a ball bearing and arotation ring 50. In therotation device 1 illustrated inFIG. 13A , two or moreendless guides 3′ are provided spaced apart from each other in the axial direction of thedrum 6. As shown inFIG. 13B , a plurality of movingsections 4 1 to 4 i are attached to eachguide 3′ so that the movingsections 4 1 to 4 i are movable in the circumferential direction of theguide 3′. Therefore, each movingsection 4 i rotates around thedrum 6 along with theguide 3′ while additionally moving relative to theguide 3′ around thedrum 6 along theguide 3′. - For the
guide 3′ and the movingsection 4 i, an R Guide manufactured by THK® Co., Ltd., as illustrated inFIG. 18A , or a Gonio Way manufactured by Nippon Bearing Co., Ltd., may suitably be employed. Preferably, a rolling element such as a ball or a wheel is inserted between theguide 3′ and the movingsection 4 i. Eachguide 3′ may be a number of rails or grooves attached together in the circumferential direction of the rotation section B′. Basically, it is preferred that the reciprocating movement is a rolling movement of a bearing, or the like, but may alternatively be a sliding movement. - In
FIG. 13A , a bridging section 7 i is provided so as to extend between each pair of movingsections 4 i that are spaced apart from each other in the axial direction of thedrum 6. One end of anarm 70 i is fixed to the bridging section 7 i, and a link 8 i is rotatably attached to the other end of thearm 70 i. - In the present embodiment, a controller, being capable of moving the moving sections 4 i at a programmed velocity, is provided by the link 8 i in combination with the eccentricity between the axes C and O. Alternatively, the controller may be provided by any other link mechanism, or a controller described in PCT International Publication WO01/44086, for example, may be used.
- One end of each link 8 i is rotatably attached to the
driving section 2 via a bearing B2 and a fixedpin 8 a, and the other end of each link 8 i is rotatably attached to thearm 70 i via a bearing B3 and arotation pin 8 b. As thedriving section 2 rotates at a substantially constant velocity, the fixedpin 8 a rotates, together with thedriving section 2, at a substantially constant angular velocity, while therotation pin 8 b rotates around the fixedpin 8 a. Thus, the angular velocity of therotation pin 8 b changes depending on the rotation angle of therotation pin 8 b. Therefore, the bridging section 7 i integral with therotation pin 8 b rotates around thedrum 6 while changing the interval (pitch) with respect to an adjacent bridging section 7 i, as illustrated inFIG. 13B . - Specifically, each bridging section 7 i rotates at a relatively low velocity while it rotates from the position of the bridging section 7 n to that of the bridging section 7 2 of
FIG. 13B , whereas the bridging section 7 i rotates at a higher velocity while it rotates from the position of the bridging section 7 2 to that of the bridging section 7 n. Therefore, the spacing interval (pitch) between adjacent bridging sections 7 i changes along with the rotation of the bridging sections 7 i. -
FIG. 14A andFIG. 14B illustrate another embodiment of therotation device 1. - In the present embodiment, the
rotation ring 50 is coupled to each rotation section B′, and an attachment section 75 i, through which a pad to be described later is inserted, is provided in a generally central portion of each bridging section 7 i. The attachment section 75 i may be a space in the form of a through hole, a notch, a depression, etc. - Moreover, in the present embodiment, a groove 8Ai elongated in the radial direction of the
drum 6 is provided, instead of the link 8 i, at an end of each bridging section 7 i. The groove 8Ai is provided with the fixedpin 8 a illustrated inFIG. 14B so that the fixedpin 8 a is slidable in the radial direction. Therefore, the rotational velocity of the bridging section 7 i changes as in the previous embodiment. - In the rotation device of
FIG. 14A andFIG. 14B , the velocity of the bridging section 7 i may be controlled by a link as illustrated inFIG. 13 , or alternatively by any other controller mechanism as described above. -
FIG. 15A toFIG. 15C schematically illustrate another embodiment of the rotation device of the present invention. - The
rotation device 1 illustrated inFIG. 15A includes anendless guide 3′, a plurality of movingsections 4 i moving along theguide 3′, and the rotation section B. The rotation section B′ allows theguide 3′ to rotate about the axis of the rotation section B′. - The plurality of moving
sections 4 np are arranged in the rotation allowance direction of the section B′ (i.e., the direction in which the rotation section B′ allows theguide 3′ to rotate). Each movingsection 4 i can move away from or toward an adjacent movingsection 4 i, and can reciprocate along theguide 3′ in the direction of rotation of the rotation section B′ or in the opposite direction. If the reciprocating movement is done over a particular region of the rotation section B′, theguide 3′ may not need to be endless. Specifically, a plurality of arc-shapedguides 3′ may be arranged about the axis O of the rotation section B′ so as to be spaced apart from one another in the rotation allowance direction of the rotation section B, surrounding the axis O. In such a case, each of the plurality ofguides 3′ includes at least one moving section that is movable in the direction of rotation of the rotation member or in the opposite direction. - The
guide 3′ ofFIG. 15A is rotated at a predetermined rotational velocity about the axis O by a rotational force applying member (e.g., a motor or a power transmission device), which is not shown in the figure. Theannular guide 3′ is arranged at a predetermined position with respect to the rotation section B′. A plurality of movingsections 4 1 to 4 i are movably attached to theguide 3′. - Each moving
section 4 i can move along theguide 3′ along with the rotation of the rotation section B′. - The interval between a pair of adjacent moving sections (e.g., 4 2 and 4 3) changes depending on the rotational position. A predetermined controller as described above may be employed to accurately control such an interval. However, a certain level of control can be provided by, for example, the gravitational acceleration acting on the moving
sections 4 i. Alternatively, a motor may be provided for each moving section 4 i for driving the movingsection 4 i along theguide 3′ so that the moving section 4 i rotates at an instantaneous velocity according to a rotational angle .theta..sub.i. - In this embodiment, the rotation section B′ may be optional. The
rotation device 1 includes theendless guide 3′, and a plurality of movingsections 4 i that move while being guided by theguide 3′. Therotation device 1 in which theguide 3′ is provided with a plurality of movingsections 4 i may have a poor friction resistance as compared with one using ball bearings, but such arotation device 1 can be lighter in weight than rotation devices in the prior art. -
FIG. 16 illustrates an example of a method for transferring a worn article using therotation device 1. - The
rotation device 1 includespads 9 i each attracting an article N and allowing the article N to be transferred. In therotation device 1 illustrated inFIG. 13A andFIG. 13B , eachpad 9 i may be provided in the bridging section, or the bridging section may serve as a pad (i.e., the bridging section itself may be used as a pad). In therotation device 1 illustrated inFIG. 14A andFIG. 14B , eachpad 9 i may be fit into the attachment section 75 i of the bridging section so that thepad 9 i can rotate (e.g., about the direction normal to the drum 6), or the bridging section may serve as a pad. In therotation device 1 illustrated inFIG. 15A toFIG. 15C , eachpad 9 i may be provided in the moving section. - Each
pad 9 i ofFIG. 16 includes a plurality of suction holes for attracting the article N, and the suction holes are placed under a negative pressure to attract the article N while the pad is moving from the position of the pad 9 1 (where the article N is received from a first conveyer C1) to the position of the pad 9 3 (where the article N is handed over to a second conveyer C2). Thepad 9 i may alternatively attract the article N by using an electrostatic charge, or the like. - The first conveyer C1 is provided upstream of the
rotation device 1, and the second conveyer C2 is provided downstream of therotation device 1. The first conveyer C1 transfers the articles N to therotation device 1 at an interval D1. - For example, each
pad 9 i rotates at a circumferential velocity V1 that is about the same as that of the first conveyer C1 from when it comes near a pickup position RP until it passes the pickup position RP, and rotates at a circumferential velocity V2 that is about the same as that of the second conveyer C2 from when it comes near a hand-over position SP until it passes the hand-over position SP. In therotation device 1 illustrated inFIG. 16 , i.e., in a case where it is desired to increase the interval between pads, the relationship between the circumferential velocities is V2>V1. However, the relationship between the circumferential velocities is V2<V1 in a case where it is desired to shorten the interval between pads. The circumferential velocity of the second conveyer is about V2. - As the article N1 is transferred by the first conveyer C1 to the pickup position RP, article N1 is attracted onto the
pad 9 1 and thepad 9 1 receives the article N1 at the pickup position RP. Then, thepad 9 1 rotates toward the hand-over position SP, where thepad 9 3 releases the article N3, while gradually increasing the velocity thereof. At the hand-over position SP, thepad 9 3 stops attracting the article N3, whereby the second conveyer C2 can easily attract and receive the article N3. - In a case where a portion of the
pad 9 i is rotatably fit into the attachment section of the bridging section, thepad 9 i may rotate about a normal direction CL by a predetermined angle (e.g., 90°.) to change the orientation of the article Ni while thepad 9 i moves from the pickup position RP to the hand-over position SP. The article Ni may be a final or intermediate product of a worn article such as a napkin, a disposable diaper, disposable pants or a bandage, or may be a single-layer or multilayer sheet of woven fabric, non-woven fabric, a liquid permeable sheet or a liquid impermeable sheet. The intermediate product may be an absorbent or absorbents arranged over a web. -
FIG. 17 illustrates an example of a method for folding a web W using therotation device 1. - In the figure, each bridging section 7 i includes the
pad 9 i for attracting the web W so that the web W can be transferred. Thepad 9 i attracts the web W while it is moving from the position of the pad 9 1 (where the web W is received) to the position of the pad 9 3 (where a folded web is transferred) inFIG. 17 . - The
rotation device 1 forms a wheel for continuously transferring the web W, and is in contact with the surface of abelt 31′ of aconveyer 30′ via the web W. - The
rotation device 1 picks up the web W traveling at a first velocity V11, and hands it over to theconveyer 30′ traveling at a second velocity V21 (V11>V21). Thebelt 31′ of theconveyer 30′ basically transfers the web W at the circumferential velocity V21. Specifically, eachpad 9 i rotates at the circumferential velocity V11 at the position of the pad 9 1 (where the web W is received), and slows down to the circumferential velocity V21 by the time it reaches the position of the pad 9 3 (where a folded web is transferred). Therefore, the interval betweenadjacent pads 9 i is shortened while thepads 9 i move from the pickup position RP to the hand-over position SP, thereby slackening the web W between thepads 9 i to form a slack portion W1. - Next, the operation will be described. The web W is supplied by being attracted onto the surface of the
pad 9 1 at the pickup position RP, and then transferred along thepads 9 i of therotation device 1. While the rotation section B′ rotates in the direction of an arrow Vh, thepad 9 1 moves along theguide 3′ and in the opposite direction Vs, thereby reducing the interval between thepads 9 i. The direction Vs is defined with respect to theguide 3′. Therefore, a folded portion W2 is formed in the web W. After the formation of the folded portion W2, thepad 9 4 stops attracting the web W, whereby the web W including folded portions W2 at a predetermined pitch is transferred onto theconveyer 30′, thereby performing a so-called “Z-shaped folding process”. - The rotation device for performing the Z-shaped folding process may not be the
rotation device 1 described above, but may alternatively be, for example, a device described in PCT International Publication WO01/44086, or a device using any other link mechanism. - Another example of a folding device for performing the Z-shaped folding process is illustrated in
FIG. 19A . - In
FIG. 19A arotation device 1A includes a plurality ofpads 9 i. At least onesuction hole 10 for attracting the web W is provided in the surface of eachpad 9 i. The velocity of thepad 9 i is the same as that of the web W at the pickup position RP. However, at the hand-over position SP, the velocity is lower than that at the pickup position RP. Therefore, a slack portion W1 is formed in the web W. Preferably, the folding device includes adirectioning section 12′ so as to ensure that the slack portion W1 is folded in toward the center of therotation device 1A. - The
directioning section 12′ may be, for example, a mechanism that blows out a stream of air, a mechanism that thrusts the slack portion W1 of the web toward the center of therotation device 1A, or a mechanism that sucks the web W toward the center of therotation device 1A by a vacuum. Where the air blowing mechanism is employed, only onedirectioning section 12′ may be provided, or a plurality oforientation sections 12′ may alternatively be provided as illustrated inFIG. 19A . Also, where the slack portion thrusting mechanism is employed, only onedirectioning section 12′ may be provided, or a plurality oforientation sections 12′ may alternatively be provided. By providing a plurality oforientation sections 12′, it is possible to reliably fold in the slack portion W1 toward the center of therotation device 1A. The width of thedirectioning section 12′ (the length thereof in the direction perpendicular to the surface of the sheet of the figure) can be set to a value (a length in the direction perpendicular to the surface of the sheet of the figure) according to the width of the web W. - Moreover, one or more suction holes 11 may be provided on each of the side surfaces of the
pads 9 i by which the web W is to be sandwiched, i.e., on the side surfaces of each pad that face the side surfaces of the adjacent pads, so that the slack portions W1 of the web W are laid down along the side surfaces of thepads 9 i. - The direction in which the web is to be folded may be the direction in which the web runs or the opposite direction. For example, in a case where the circumferential velocity of the trailing one of two pads that sandwich the web therebetween is higher than that of a conveyer in the vicinity of the hand-over position SP, the web is folded by the trailing pad in the running direction. In such a case, the leading pad is only required to move so as not to interfere with the movement of the trailing pad. In a case where the circumferential velocity of the conveyer is higher than that of the leading pad in the vicinity of the hand-over position SP, the web is folded by the leading pad in the direction opposite to the running direction.
- In the present embodiment, a side surface of each
pad 9 i in the circumferential direction forms a folded portion. Specifically, the side surfaces of twoadjacent pads - An applicator (an example of a fold-holding section) 13 for applying an adhesive such as a hot melt resin may be provided on the receiving side, as illustrated in
FIG. 19A . Theapplicator 13 applies an adhesive on one or both of another web Wo and the web W to be folded so as to bond the webs Wo and W together, thereby making it easier to maintain the shape of the folded portion W2. - Alternatively, in the present embodiment, a conveyer as illustrated in
FIG. 20 may be used to maintain the shape of the folded portion W2. - Moreover, the
directioning section 12′ may suck in the slack portion W1 by a stream of air as illustrated inFIG. 20 . The suction by thedirectioning section 12′ forms the slack portion W1 into a shape that is protruding from therotation device 1A. The suction of the web W, the number of the directioning sections, etc., may be set as those for the device ofFIG. 19A . - Referring to
FIG. 20 , the slack portion W1 of the web is sandwiched between thepad 9 i and thebelt 31′ of theconveyer 30′, thereby forming the folded portion W2. Another example of the fold-holding section provided on the receiving side may be, for example, ameshed belt 31′ of theconveyer 30′ capable of sucking an air therethrough by which the folded web W is received, wherein the web W is sucked by anair 100, as illustrated inFIG. 20 , so as to maintain the shape of the folded portion W2. Instead of themeshed belt 31′, abelt 31′ including a plurality of holes therein may be used. Moreover, the fold-holding section may alternatively maintain the shape of the slack portion W1 by using an electrostatic charge, or the like. - A bellows-shaped folding device for performing a bellows-shaped folding process, which is a modified version of the Z-shaped folding process, will be described with reference to
FIG. 19B toFIG. 19D . The bellows-shaped folding device is capable of folding the slackened web W at a plurality of positions. - The bellows-shaped folding device includes, in addition to the elements of the folding device of
FIG. 19A , a plurality of plates Pi betweenadjacent pads FIG. 19D , the plates Pi are pivotally connected to one another and to thepads 9 i via joints Ji. For example, the plate P1 is pivotally connected to thepad 9 i−1 via the joint Ji, and the adjacent plate P2 is pivotally connected to the plate Pi via the joint J2. - Each plate Pi is capable of sucking the web W. Each plate Pi may include at least one suction hole, through which the web W is sucked. In such a case, each plate Pi may be meshed. Moreover, the bellows-shaped folding device may have each plate Pi charged with a first charge and the web with another charge that attracts the first charge, so as to attract the web W onto the plate Pi.
- Referring to
FIG. 19C , as the interval betweenadjacent pads elastic member 40′ may be provided between the plates P2 and P3 as illustrated inFIG. 19D so as to restrict the angle by which the plates Pi can pivot. - As the interval between
adjacent pads conveyer 30′. - The folded web W may be transferred onto the
conveyer 30′ after the interval betweenadjacent pads FIGS. 22 and 23 . -
FIG. 21 illustrates another example of a folding device. In the figure, a pair offirst rolls second rolls - Since the velocities satisfy v1>v2, the slack portion W1 is formed between the first rolls 21 and the second rolls 22. The direction in which the slack portion W1 is folded is determined by the
directioning section 12. In the present embodiment, thedirectioning section 12 includes twobars second bar 12 b moves after thefirst bar 12 a moves, thereby forming the folded portion W2. Since the web W is made of a relatively light material such as non-woven fabric, pulp or a synthetic resin, the web W can easily be supported by thebars second bar 12 b retracts toward the first rolls 21 before it is caught between the second rolls 22. Moreover, thefirst bar 12 a can move in the width direction of the web W so as to extend beyond the edge of the folded portion W2. - It is possible to produce a disposable worn article, including a napkin, a diaper and pants, with a wall formed therein, by employing the “Z-shaped folding process” as described above.
-
FIG. 22 illustrates an example of a top sheet of a napkin, in which broken lines represent a web. InFIG. 22 , the walls Tw are formed in a top sheet T so as to extend in a direction generally perpendicular to the running direction X of the top sheet T being produced. With the running direction X being a transverse direction, elongated walls Tw can be formed along the opposing sides of the napkin. -
FIG. 23 illustrates a top sheet (web) W of a diaper or pants before cutting. By slacking the web W using the folding method described above, the walls Tw can be formed in a direction Y transverse to a running direction X of the web Was illustrated in the figure. In other words, the longitudinal direction Y of the walls Tw is transverse to the running direction X of the web W. The longitudinal direction of an absorbent (core) Co denoted by a broken line is transverse to the running direction X of the web W (i.e., the production line is of a so-called “transverse flow” type). Therefore, it is possible to produce a diaper or pants in a transverse flow type production by cutting the web W in a direction transverse to the running direction (the X direction) as indicated by a two-dot chain line. As is well known in the art, a liquid impermeable back sheet, in addition to the absorbent Co, can be layered on the liquid permeable top sheet. The wall Tw may alternatively be formed on the absorbent Co. The wall Tw may be formed in the vicinity of an end of the absorbent Co, or a plurality of walls Tw may be formed in the vicinity of the end of the absorbent Co. - While the web is folded in a certain direction in the examples illustrated in
FIG. 19A toFIG. 19D andFIG. 20 , every other folded portion may be folded back in the opposite direction, for example, so as to form the walls Tw illustrated inFIG. 22 andFIG. 23 . - An elastic member for making the worn article better fit to the wearer may be provided along the wall Tw. For example, a mechanism for attaching an elastic member that is extending in the direction Y transverse to the running direction X of the web W onto the web (e.g., a widening mechanism as described in Japanese Patent Application No. 12-028945) may be employed so as to provide an elastic member inside the wall Tw. The elastic member may be made of at least one flat or cord rubber.
- The wall Tw of a disposable worn article such as a napkin, a diaper or pants as described above may be formed by the bellows-shaped folding process. Moreover, in a disposable worn article such as a napkin, a diaper or pants, a plurality of top portions and bottom portions may be formed on the absorbent Co through the bellows-shaped folding process. In such a case, excrement is drawn into the bottom portions, thereby reducing a leak from the worn article.
-
FIG. 24 is a diagram illustrating an example of a plurality of walls Tw formed on each absorbent Co through the bellows-shaped folding process. The walls Tw may be positioned on the absorbent Co directly, or indirectly via a sheet, or the like. The sheet may be a continuous sheet, or at least one sheet may be layered between a plurality of walls Tw and an absorbent. In order to fix the walls Tw at predetermined positions, bottom portions Vw of the walls Tw are preferably flat. Specifically, the area over which the bottom portions Vw of the walls Tw contact the sheet or the absorbent Co is preferably 50% or more of the total area of the sheet or the absorbent Co. -
FIG. 25 is a diagram illustrating a portion of a bellows-shapedfolding device 100 for forming bottom portions Vw that are generally flat. The bellows-shapedfolding device 100 includes a plurality ofpads 9 i, at least onedummy pad 101, and a plurality of generally V-shaped plate pairs 102. Each of the generally V-shaped plate pairs 102 includes two plates P and P, and each plate P is capable of pivoting with respect to the other about the link between the plates P and P. One end of each generally V-shapedplate pair 102 is connected to thedummy pad 101 or thepad 9 i. - At least one of the
pads 9 i, thedummy pad 101 and the generally V-shapedplate pair 102 is capable of sucking the web W onto the surface of the plates P and P and the surface of the top portion of thedummy pad 101. Where the width Wd of the bottom portion of the wall is 1 cm or less, the web W may be sucked by using only thepads 9 i and the generally V-shaped plate pairs 102. When the width Wd of the bottom portion of the wall is so small, the web W can be attracted and secured only by suction by thepads 9 i and the generally V-shaped plate pairs 102. - Preferably, the surface configuration of the
pads 9 i and thedummy pads 101 is such that the surfaces of thepad 9 i and thedummy pad 101 contact the conveyer when handing over the folded web W to the conveyer. - Moreover, it is possible to attach at least one elastic member to a web in an intermittent manner by employing the “Z-shaped folding process”. Accordingly, a disposable worn article including a web with at least one elastic member attached thereto in an intermittent manner can be produced by employing the “Z-shaped folding process”.
- Specifically, at least one elastic member is bonded to a web, with a slack portion having been formed therein through the “Z-shaped folding process”, so that the elastic member extends across the slack portion, as illustrated in
FIG. 26A . Then, the elastic member F is cut off in the vicinity of a position between one edge W11 of the slack portion W1 of the web W and the other edge W12 of the slack portion W1. The elastic member F may be cut by using a straight cutter or an embossing roll. A straight cutter, an embossing roll, or the like, can cut off the elastic member through the application of heat, pressure, or a combination thereof, for example. U.S. patent application Ser. No. 09/891,034, PCT International Publication WO00/76444 and Japanese Laid-Open Patent Publication No. 2000-26015 are incorporated herein by reference, with respect to a cutting method using an embossing roll. Upon the cutting off of the elastic member, the slack of the web is eliminated. -
FIG. 26B is a diagram illustrating the web W after cutting off the elastic member F and eliminating the slack. In this way, the elastic member can be provided on the web W except for a portion W3 that has been a slack portion. Thus, it is possible to provide the web W with pieces of at least one elastic member F that are spaced apart from one another at a constant interval. - An elastic member F may be sandwiched between a first web that has been subjected to the “Z-shaped folding process” and a second web.
FIG. 27 illustrates an example of a device for intermittently introducing an elastic member F between a first web W that has been subjected to the “Z-shaped folding process” and a second web Wo. - The device applies an adhesive 201 on at least a portion of at least one of the first web and the second web. Then, nip
rolls 200 secure the first web W, the elastic member F and the second web Wo with respect to one another. The laminate obtained by the nip rolls 200 is passed to anembossing roll 203. Theembossing roll 203 is provided with a plurality of protrusions that cut off at least one the elastic member F of the laminate along with a portion of the second web Wo. The tip of each protrusion may be sharp as disclosed in U.S. patent application Ser. No. 09/891,034. - The second web Wo may be provided with a slit at each position corresponding to a slack portion W1 of the first web W. When the slack W1 of first web W is eliminated, i.e., when the laminate on which the elastic member F has been cut off is placed under a tension, the second web Wo is also cut off along the slit.
- Alternatively, the second web Wo may include a slack portion. In such a case, the first web W, the elastic member F and the second web Wo are bonded together so that the position of the slack portion of the first web W corresponds to the position of the slack portion of the second web Wo. Only the elastic member F may be cut off. For example, it is possible to cut off only the elastic member F by employing an elastic member F whose melting point is lower than that of the second web Wo and embossing the laminate while heating the
embossing roll 203 to a predetermined temperature. It is possible to cut off only the elastic member F with substantially no heat-induced alteration to the second web Wo if the temperature of theembossing roll 203 is higher than the melting point of the elastic member F and lower than the melting point of the second web Wo. Moreover, even when the temperature of theembossing roll 203 is higher than the melting point of the second web Wo, it is possible to cut off the elastic member before holes are created in the second web if the running velocity of the laminate is high. -
FIG. 28 is a diagram illustrating an example of a pants-shaped diaper N, which is a disposable worn article, being spread out. The pants-shaped diaper N includes an absorbent Co, afront flap 300 and aback flap 301. Thefront flap 300 and theback flap 301 include a waist gather Fw that closely fits to the wearer around the waist, and a fit gather Fb that fits to the abdominal part of the wearer. The fit gather Fb is generally absent in a portion where the pants-shaped diaper and the absorbent Co overlap with each other. If there is an elastic member F in the overlapped portion, the absorbent Co shrinks, thereby deteriorating the comfort to the wearer. The front orback flap - The elastic member described above may be a polyurethane fiber, a natural rubber or a synthetic rubber, The polyurethane fiber may be LYCRA® manufactured by E I du Pont de Nemours and Company. The elastic member may be in the form of a cord, a string or a net, or have a flat shape. As a net-shaped elastic member, Rebound® manufactured by CONWED PLASTICS may be used.
- As described above, in the rotation device of the present invention, rotation member is provided so as to allow a guide to rotate, with the guide being provided with a plurality of moving sections, whereby each moving section can slide independently. Therefore, the friction between the guide and the moving sections is significantly reduced, and thus it is possible to rotate the moving section continuously over a long period of time. Moreover, a plurality of moving sections can be provided without being spaced apart from one another in the axial direction, whereby the size of the device can be reduced.
- Moreover, when a plurality of moving sections are provided in the axial direction with a bridging section extending between the moving sections, the bridging section is stabilized because the bridging section can then be supported at two positions.
- Moreover, with the folding method or the folding device of the present invention, it is possible to easily and efficiently form a folded portion or a wall in a direction transverse to the direction in which the first web is transferred.
- A worn article including a wall formed as described above has different characteristics from those of a worn article having a wall that is parallel to the direction in which the first web is transferred.
- Various other modifications will be apparent to and can be readily made by those skilled in the art without departing from the scope and spirit of this invention. Accordingly, it is not intended that the scope of the claims appended hereto be limited to the description as set forth herein, but rather that the claims be broadly construed.
Claims (3)
1-2. (canceled)
3. A method for folding a web by using a rotation device, the rotation device comprising a plurality of pads that rotate to continuously transfer the web, the method comprising the steps of: supplying the web onto surfaces of the pads that are spaced apart from one another at a predetermined spacing interval; holding, by using the pads, the web on the surfaces of the pads; changing the spacing interval between adjacent ones of the pads onto which the web has been supplied; slacking a portion of the web between the adjacent ones of the pads by reducing the spacing interval therebetween so as to fold the portion of the web; and releasing the web from the pads.
4-11. (canceled)
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US11/180,170 US8002928B2 (en) | 2002-08-22 | 2005-07-13 | Method and apparatus for producing wearing article |
US13/086,854 US20110212818A1 (en) | 2002-08-22 | 2011-04-14 | Method and apparatus for producing wearing article |
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US11/180,170 Division US8002928B2 (en) | 2002-08-22 | 2005-07-13 | Method and apparatus for producing wearing article |
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US13/086,836 Expired - Fee Related US8663420B2 (en) | 2002-08-22 | 2011-04-14 | Method and apparatus for producing wearing article |
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US11/250,849 Expired - Lifetime US7216685B2 (en) | 2002-08-22 | 2005-10-14 | Method and apparatus for producing wearing article |
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- 2011-04-14 US US13/086,854 patent/US20110212818A1/en not_active Abandoned
- 2011-04-14 US US13/086,871 patent/US20110196331A1/en not_active Abandoned
- 2011-04-14 US US13/086,836 patent/US8663420B2/en not_active Expired - Fee Related
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US8636136B2 (en) | 2011-12-20 | 2014-01-28 | Kimberly-Clark Worldwide, Inc. | Apparatus and method for rotatably conveying and applying discrete parts to a substrate |
US8813351B2 (en) | 2011-12-20 | 2014-08-26 | Kimberly-Clark Worldwide, Inc. | Apparatus and method for applying discrete parts to a moving web |
US9085418B2 (en) | 2011-12-20 | 2015-07-21 | Kimberly-Clark Worldwide, Inc. | Apparatus and method for rotatably conveying and applying discrete parts to a substrate |
US20160256332A1 (en) * | 2015-03-06 | 2016-09-08 | The Procter & Gamble Company | Method for Manufacturing Absorbent Articles Including a Discrete Barrier Member |
US10604367B2 (en) * | 2016-04-18 | 2020-03-31 | Zuiko Corporation | Method and device for cutting outer layer of rollstock |
Also Published As
Publication number | Publication date |
---|---|
US8002928B2 (en) | 2011-08-23 |
US20050241751A1 (en) | 2005-11-03 |
US20110188985A1 (en) | 2011-08-04 |
US7216685B2 (en) | 2007-05-15 |
US8663420B2 (en) | 2014-03-04 |
US20040035521A1 (en) | 2004-02-26 |
US20060032589A1 (en) | 2006-02-16 |
US7008497B2 (en) | 2006-03-07 |
US20110196331A1 (en) | 2011-08-11 |
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