AU2007305506A1 - Longitudinal sealing mechanism - Google Patents

Longitudinal sealing mechanism Download PDF

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Publication number
AU2007305506A1
AU2007305506A1 AU2007305506A AU2007305506A AU2007305506A1 AU 2007305506 A1 AU2007305506 A1 AU 2007305506A1 AU 2007305506 A AU2007305506 A AU 2007305506A AU 2007305506 A AU2007305506 A AU 2007305506A AU 2007305506 A1 AU2007305506 A1 AU 2007305506A1
Authority
AU
Australia
Prior art keywords
longitudinal
seal portion
width
sealing mechanism
packaging material
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
Application number
AU2007305506A
Inventor
Satoshi Hashimoto
Yukio Sasaki
Masahiko Tatsuoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ishida Co Ltd
Original Assignee
Ishida Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ishida Co Ltd filed Critical Ishida Co Ltd
Publication of AU2007305506A1 publication Critical patent/AU2007305506A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/18—Applying or generating heat or pressure or combinations thereof by endless bands or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/347—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients
    • B29C66/3472—General aspects dealing with the joint area or with the area to be joined using particular temperature distributions or gradients; using particular heat distributions or gradients in the plane of the joint, e.g. along the joint line in the plane of the joint or perpendicular to the joint line in the plane of the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—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
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
    • 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
    • B29C66/49—Internally supporting the, e.g. tubular, article during joining
    • 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
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    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
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    • B29C66/822—Transmission mechanisms
    • B29C66/8222—Pinion or rack mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • 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
    • B29C66/83541—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement
    • B29C66/83543—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws flying jaws, e.g. jaws mounted on crank mechanisms or following a hand over hand movement cooperating flying jaws
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • 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
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/2014—Tube advancing means
    • B65B9/2021—Tube advancing means combined with longitudinal welding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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    • B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
    • B65B9/207—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web advancing continuously
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
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    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81419—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B2051/105—Heat seal temperature control

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Package Closures (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)

Description

SPECIFICATION LONGITUDINAL SEALING MECHANISM TECHNICAL FIELD The present invention relates to a longitudinal sealing mechanism mounted on a 5 bag manufacturing and packaging apparatus and configured to seal an overlapped portion of a packaging material formed in a tubular shape while conveying the same. BACKGROUND ART In recent years, there has been provided a bag manufacturing and packaging apparatus as a device for bag manufacturing and packaging, which manufactures bags and .0 fills the inside of these bags with articles to be packaged such as snack foods. For example, with a longitudinal bag manufacturing and packaging apparatus called a pillow packaging apparatus, a packaging material that is a sheet-like film is formed into a tubular shape by a former and a tube, and overlapped longitudinal ends of the tubular packaging material are thermally sealed (thermal welding) to be made into a tubular packaging material by a L5 longitudinal sealing mechanism. Then, the articles to be packaged are filled from the tube into the tubular packaging material which ultimately becomes a bag. Thereafter, a portion across a top end portion of the bag and a bottom end portion of the next following bag are thermally sealed by a transverse sealing mechanism disposed blow the tube, and then the center of the thermal seal portion (transverse seal portion) is cut by a cutter. Z0 With this type of longitudinal sealing mechanism mounted on the bag manufacturing and packaging apparatus described as above, a sheet-like packaging material is wrapped around the tube to form the packaging material into a tubular shape. Then, an overlapped portion of the tubular packaging material is thermally sealed by causing a heated heater belt to come into contact with the overlapped portion and applying 25 heat and pressure thereto. At this time, as a counterpart of the heater belt to sandwich the overlapped portion of the packaging material therebetween, the tube that forms the tubular packaging material is provided with a pad (receiving member) on the surface facing the heater belt. For example, patent document 1 discloses a longitudinal sealing device including 30 a heat generating protrusion provided at a heater block and a pair of guide rails provided at an outer surface of a filling tube, in which an overlapped portion of a packing material, i.e., a seal portion, is resiliently deformed by the heat generating protrusion and the guide rails and supported at three points, and heat is applied intensively to the overlapped portion from the heat generating protrusion in order to heat seal the overlapped portion. 1 <Patent Document 1> JP-A Publication No. 2000-72104 (published on March 7, 2000) DISCLOSURE OF THE INVENTION <OBJECT TO BE ACHIEVED BY THE PRESENT INVENTION> 5 However, the above described conventional longitudinal sealing mechanism has the following problems. Specifically, with the longitudinal sealing mechanism disclosed in the above publication, because a relatively large amount of heat is applied also to the surrounding area of the seal portion, there is a risk that not only the seal portion but also its surrounding 10 becomes contracted, generating wrinkles. An object of the present invention is to provide a longitudinal sealing mechanism capable of reducing generation of wrinkles, sealing failure, and the like at a surrounding area of a longitudinal seal portion. <MEANS TO ACHIEVE THE OBJECT> 15 A longitudinal sealing mechanism according to a first aspect of the present invention is a longitudinal sealing mechanism that conveys a packaging material formed into a tubular shape and seals an overlapped portion of the packaging material. The longitudinal sealing mechanism includes a contact section, a heating section, and a receiving member. The contact section comes into contact with the overlapped portion of 20 the packaging material, which is formed in a direction along the conveying direction of the packaging material. The heating section heats the contact section. The receiving member sandwiches the packaging material against the contact section so as to longitudinally seal the packaging material. Further, the contact section, the heating section, and the receiving member are configured such that the amount of heat per unit time applied to the packaging 25 material from the contact section is reduced in the direction toward the both sides of the longitudinal seal portion in the direction crossing the conveying direction of the packaging material. Here, in the longitudinal sealing mechanism which conveys the packaging material in a predetermined direction, makes the packaging material into a tubular shape, 30 and forms a longitudinal seal portion at the overlapped portion in order to manufacture a bag, the contact section, the heating section, and the receiving member which form the longitudinal seal portion are configured so that the amount of heat applied to the packaging material from the contact section is reduced in the direction toward the both sides of the longitudinal seal portion in the width direction. Specifically, in order to prevent excess 2 heat from being applied to the peripheral area of the longitudinal seal portion, for example, a temperature gradient is created in which the temperature is reduced in the direction toward the both sides of the contact section in the width direction. Note that the both sides of the longitudinal seal portion in the direction crossing 5 the conveying direction of the above described packaging material refer to both end portions of the longitudinal seal portion in the width direction. Typically, with this type of longitudinal sealing mechanism, the width of the contact section that comes into direct contact with the packaging material is set larger than the width of the longitudinal seal portion such that the longitudinal seal portion can be 10 formed even when the packaging material is displaced to the left or right during conveyance. Consequently, with the conventional longitudinal sealing mechanism, the both sides of the longitudinal seal portion in the width direction are subjected to the same amount of heat as the longitudinal seal portion is and become contracted. This has been a factor in generating wrinkles and sealing failure. 15 With the longitudinal sealing mechanism of the present invention, the contact section, the heating section, and the receiving member are configured such that the heat will not be applied more than necessary to the surrounding area of the longitudinal seal portion when the heat is applied from the contact section to the packaging material. Accordingly, the amount of heat applied to portions other than the longitudinally 20 sealed portion of the packaging material can be reduced compared to the conventional mechanism, and the necessary amount of heat can be applied only to the longitudinal seal portion of the packaging material. As a result, it is possible to prevent the both sides of the longitudinal seal portion from being excessively heated, and thus generation of problems such as wrinkles, sealing failure, and the like along the longitudinal seal portion can be 25 prevented. A longitudinal sealing mechanism according to a second aspect of the present invention is the longitudinal sealing mechanism according to the first aspect of the present invention, wherein the heating section and the receiving member each have a width substantially equal to the width of the longitudinal seal portion formed on the packaging 30 material. Further, the contact section has a width larger than the width of the longitudinal seal portion. Here, the widths of the heating section and the receiving member are made equal to the width of the longitudinal seal portion, and the width of the contact section is made larger than the width of the longitudinal seal portion. 3 Accordingly, a large amount of heat necessary for longitudinal sealing is applied to the area of the contact section where the width is equal to the width of the heating section. At the same time, the amount of heat is gradually reduced toward the areas on both sides of the aforementioned area. As a result, the temperature can be reduced toward the 5 both sides of the contact section that comes into contact with the packaging material, and thus it is possible to prevent generation of wrinkles and sealing failure at the surrounding area of the longitudinal seal portion. A longitudinal sealing mechanism according to a third aspect of the present invention is the longitudinal sealing mechanism according to the first aspect of the present 10 invention, wherein the receiving member has a width substantially equal to the width of the longitudinal seal portion. Here, the width of the receiving member is formed according to the width of the longitudinal seal portion. Accordingly, even when the width of the contact section is larger than the width of .5 the longitudinal seal portion, only the longitudinal seal portion is sandwiched between the contact section and the receiving member and the heat is applied thereto. Consequently, an outer side of the longitudinal seal portion is prevented from being directly subjected to a large amount of heat, and thus generation of wrinkles, sealing failure, and the like along the longitudinal seal portion can be prevented. 20 A longitudinal sealing mechanism according to a fourth aspect of the present invention is the longitudinal sealing mechanism according to the first aspect of the present invention, wherein the receiving member has a curved contact surface whose both sides in the width direction do not come into contact with the contact section. Here, the receiving member that sandwiches the packaging material against the 25 contact section and forms the longitudinal seal portion is configured such that a contact surface that contacts the packaging material is formed in a curved shape such that only the longitudinal seal portion is sandwiched between the contact section and the receiving member. Accordingly, it is possible to reduce the amount of heat applied to the both sides 30 of the longitudinal seal portion from the contact section, and the heat can be applied mainly to the longitudinal seal portion. As a result, it is possible to prevent excess supply of heat to the surrounding of the longitudinal seal portion and generation of wrinkles and sealing failure. A longitudinal sealing mechanism according to a fifth aspect of the present 4 invention is the longitudinal sealing mechanism according to the first aspect of the present invention, wherein the contact section has a curved surface from which the packaging material comes off, in the area on the outer side of a contact portion that contacts the longitudinal seal portion. 5 Here, the contact section that sandwiches the packaging material against the receiving member so as to form the longitudinal seal portion has the curved surface whose distance from the packaging material increases toward the both side in the width direction. Accordingly, the both sides of the longitudinal seal portion of the packaging material are prevented from being directly sandwiched between the contact section and the .0 receiving member. As a result, it is possible to prevent excess supply of heat to the surrounding of the longitudinal seal portion and generation of wrinkles and sealing failure. A longitudinal sealing mechanism according to a sixth aspect of the present invention is the longitudinal sealing mechanism according to any one of the first through fifth aspects of the present invention, wherein the heating section is formed such that the 5 cross sectional shape in a plane perpendicular to the conveying direction of the packaging material is generally T shaped, and a projection-side surface of the T shape is disposed adjacently to the contact section. Here, the contact section is heated by using the heating section whose cross sectional shape is generally T shaped. Further, the contact section is heated by the 0 projection-side surface of the generally T shape. Accordingly, in the projecting portion of the generally T shaped heating section, because the heat becomes more easily diffused in the both end portions than in the center portion, it is possible to create a temperature gradient inclined in the direction toward the both sides. As a result, it is possible to reduce the amount of heat applied to the both sides !5 of the longitudinal seal portion and prevent generation of wrinkles, sealing failure and the like along both sides of the longitudinal seal portion. A longitudinal sealing mechanism according to a seventh aspect of the present invention is the longitudinal sealing mechanism according to any one of the first through sixth aspects of the present invention, wherein the contact section is a rotational band 0 structure that rotates around the heating section. Accordingly, it is possible to prevent an excess amount of heat from being applied to the surrounding of the longitudinal seal portion from the rotational band structure, and thus generation of problems such as wrinkles, sealing failure, and the like along the longitudinal seal portion can be prevented. 5 A longitudinal sealing mechanism according to an eighth aspect of the present invention is the longitudinal sealing mechanism according to any one of the first through sixth aspects of the present invention, wherein the contact section is a heater block integrally formed with the heating section. 5 Accordingly, it is possible to prevent an excess amount of heat from being applied to the surrounding of the longitudinal seal portion from the heater block, and thus problems such as generation of troubles such as wrinkles, sealing failure, and the like along the longitudinal seal portion can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS tO Figure 1 is a schematic view showing a configuration of a bag manufacturing and packaging apparatus according to an embodiment of the present invention. Figure 2 is an enlarged view showing a longitudinal sealing mechanism included in the bag manufacturing and packaging apparatus in Figure 1. Figure 3 is a cross sectional view taken along an arrow A-A in Figure 2. .5 Figure 4 is a lateral view showing the longitudinal sealing mechanism in Figure 2. Figure 5 is an elevation view showing the longitudinal sealing mechanism in Figure 2. Figure 6 is an elevation view showing the shape of a pulley included in the longitudinal sealing mechanism in Figure 2. .0 Figure 7 is an enlarged view showing a transverse sealing mechanism included in the bag manufacturing and packaging apparatus in Figure 1. Figure 8 is a graph showing a widthwise temperature distribution of a heater belt included in the longitudinal sealing mechanism in Figure 2. Figure 9 is a cross sectional view showing a configuration of a longitudinal .5 sealing mechanism according to another embodiment of the present invention. Figures 10(a) and 10(b) are cross sectional views showing the cross sectional shape of a receiving member included in a longitudinal sealing mechanism according to yet another embodiment of the present invention. Figure 11 is a cross sectional view showing the cross sectional shapes of a heater 0 belt and a heater block included in a longitudinal sealing mechanism according to yet another embodiment of the present invention. Figure 12 is a cross sectional view showing the cross sectional shapes of a heater belt and a heater block included in a longitudinal sealing mechanism according to yet another embodiment of the present invention. 6 Figure 13 is a cross sectional view showing the cross sectional shapes of a heater block and the like included in a longitudinal sealing mechanism according to yet another embodiment of the present invention. DESCRIPTION OF THE REFERENCE SYMBOLS 5 1 Bag manufacturing and packaging apparatus 10 Bag manufacturing unit 13 Forming mechanism 13a Former 13b Tube LO 13c Surface fastener (receiving member) 14 Pull down belt mechanism 14a Driving roller 14b Driven roller 14c Belt 5 15 Longitudinal sealing mechanism 16a Heater belt (contact section, rotational band structure) 16b Heater block (heating section) 16c Pulley 16e Heater bar !0 16f Rotation shaft 17 Transverse sealing mechanism 20 Control unit 51 Sealing jaws 113c Surface fastener 5 ll3ca Surface 11 6a Heater belt (contact section, rotational band structure) 116aa Surface 116b Heater block 116c Heater block 0 213c Surface fastener 213ca Surface 213cb Surface 216a Heater block (contact section) d, dl to d3 Width 7 F Film (packaging material) Fl Longitudinal seal portion F2 Overlapped portion B Bag 5 BEST MODE FOR CARRYING OUT THE INVENTION A bag manufacturing and packaging apparatus I equipped with a longitudinal sealing mechanism 15 according to an embodiment of the present invention is described with reference to Figures 1 through 8. <ENTIRE STRUCTURE OF BAG MANUFACTURING AND PACKAGING o APPARATUS 1> As shown in Figure 1, the bag manufacturing and packaging apparatus I according to an embodiment of the present invention is an apparatus that covers articles C (here, potato chips) such as potato chips with a thermoplastic film (packaging material) F, and manufactures a bag by transversely and longitudinally sealing the film F made into a .5 tubular shape. *Note that, as a general rule, potato chips of a predetermined amount drop from a weighing device and the like disposed above the bag manufacturing and packaging apparatus 1. The bag manufacturing and packaging apparatus 1 includes a bag manufacturing 0 unit 10, a control unit 20, and a film roll holder (not shown). <FILM ROLL HOLDER> The film roll holder holds a film roll from which a sheet-like film F is unwound and sent to a former 13a of the later described bag manufacturing unit 10. The film roll is formed by winding the long film F. The tension of the film F unwound from this film roll .5 is maintained in a predetermined range by a dancer roller or the like in order to prevent loosening and meandering during conveyance. In addition, a film remaining amount detection sensor (not shown) that detects the remaining amount of the film F wound around the film roll is disposed in the vicinity of the film roll holder. 0 <BAG MANUFACTURING UNIT 10> As shown in Figure 1, the bag manufacturing unit 10 includes: a forming mechanism 13 that forms the sheet-like film F sent from the film roll holder into a tubular shape; a pull down belt mechanism 14 that conveys the tube-like film F (hereinafter referred to as "tubular film") downward; the longitudinal sealing mechanism 15 that 8 longitudinally seals an overlapped portion of the tubular film; and a transverse sealing mechanism 17 that transversely seals the tubular film and thereby seals the upper and lower ends of a bag B. <FORMING MECHANISM 13> 5 The forming mechanism 13 includes a tube 13b, the former 13a, and a surface fastener (receiving member) 13c. Note that, here, the surface fastener 13c is described as a member on the forming mechanism 13 side, however, it can be regarded as a member on the later described longitudinal sealing mechanism 15 side. The tube 13b is a cylindrical shaped member whose upper and lower ends are .0 open. The potato chips C weighed by the weighing device are fed into the opening at the upper end of the tube 13b. In addition, the tube 13b includes the surface fastener 13c on the surface facing a heater belt 16a of the later described longitudinal sealing mechanism 15. Further, an overlapped portion F2 (see Figure 3) of the film F is sandwiched therebetween the surface fastener 13c and the heater belt 16a, and the overlapped portion .5 F2 is thereby sealed. The former 13a is disposed so as to surround the tube 13b. The shape of the former 13a is formed such that the sheet-like film F unwound and sent from the film roll is formed into a tubular shape when passing through the former 13a and the tube 13b. In addition, the tube 13b and the former 13a of the forming mechanism 13 can be 0 replaced according to the size of the bags to be manufactured. As shown in Figures 3 through 5, the surface fastener 13c is interchangeably attached to a flat portion of the surface of the tube 13b, in which the flat portion faces the heater belt 16a of the longitudinal sealing mechanism 15. The surface fastener 13c applies heat and pressure to the overlapped portion of the film between the surface fastener 13c !5 and the heater belt 16a and seals the portion. Note that, in view of improvement of sealing performance, as the surface fastener 13c, it is preferable to use a small member such as Magic Tape (registered trademark) or the like, for example, which has elasticity in the direction of contact with the film F and whose contact surface has small frictional resistance. In addition, as shown in Figure 3, the surface fastener 13c has a width dl 0 substantially equal to a width d (see Figure 2) of a longitudinal seal portion F1 of the film F in the plane view, and forms the longitudinal seal portion F1 within this width. Accordingly, when the longitudinal seal portion Fl is formed on the film F, the sealing process is performed by sandwiching an overlapped portion F2 of the film F between the surface fastener 13c having a width substantially equal to the width d of the longitudinal 9 seal portion F1 and the heater belt 16a. Thereby, even when a width d2 of the heater belt 16a is larger than the width d of the longitudinal seal portion Fl, heat can be applied intensively to the longitudinal seal portion F1 to accomplish the sealing process. <PULL DOWN BELT MECHANISM 14> 5 The pull down belt mechanism 14 is a mechanism that holds the tubular film wound around the tube 13b by suction-adhesion and conveys the same downward. As shown in Figures 1 and 5, the pull down belt mechanism 14 is provided with a belt 14c on each of the left and right sides of the tube 13b. The pull down belt mechanism 14 rotates the belts 14c having the suction-adhesion function by a driving roller 14a and a driven 10 roller 14b and conveys the tubular film downward. Note that, in Figures 1 and 5, the drawing of a roller driving motor that rotates the driving roller 14a and the like is omitted. <LONGITUDINAL SEALING MECHANISM 15> As shown in Figure 1, the longitudinal sealing mechanism 15 is a mechanism that presses, with a constant amount of pressure, the overlapped portion F2 (see Figure 3) of .5 the tubular film F wound around the tube 13b onto the surface fastener 13c portion attached to the tube 13b, applies heat and pressure thereto, and thereby forms the longitudinal seal portion F1 (see Figures 1 and 2) along the longitudinal direction (conveying direction). In addition, the longitudinal sealing mechanism 15 is disposed on the front side of the tube 13b, and is connected to the control unit 20. In addition, as shown 20 in Figure 2, the longitudinal sealing mechanism 15 includes the heater belt (contact section, rotational band structure) 16a, a heater block (heating section) 16b and a pulley 16c. As shown in Figure 2, the heater belt 16a is an annularly formed (ring-like) metal belt with a thickness of approximately 0.15 mm. The heater belt 16a is held in a state of 25 maintaining a substantially constant amount of tensional force by the two pulleys 16c disposed in contact with the inner surface of the heater belt 16a. The heater belt 16a is rotated in the longitudinal direction when the pulleys 16c rotate. The heater belt 16a comes into contact with the overlapped portion F2 (see Figure 3) of the film F in a manner of sandwiching the tubular film F being conveyed at substantially the same speed as the 30 rotation speed of the heater belt 16a between the heater belt 16a and the tube 13b (surface fastener 13c); applies pressure and heat to the overlapped portion F2 in the space between the heater belt 16a and the surface fastener 13c; and thereby longitudinally seals the overlapped portion F2. In addition, as shown in Figure 3, the heater belt 16a has the width d2 larger than the width dl of the surface fastener 13c and a width d3 of the heater block 10 16b which are the widths substantially equal to the width d of the longitudinal seal portion Fl. Consequently, as shown in Figure 8, on the heater belt 16a that comes into direct contact with the overlapped portion F2 of the film F, a temperature gradient is created in which the temperature is reduced from the center portion, where the heater block 16b is 5 adjacently disposed, toward the both sides. Accordingly, a sufficient amount of heat and pressure per unit time to perform sealing can be applied to the longitudinal seal portion F1 of the film F, whereas a smaller amount of heat and pressure can be applied to the area surrounding the longitudinal seal portion Fl. As a result, it is possible to prevent an excess amount of heat per unit time from being applied to the surrounding of the longitudinal seal 10 portion F1 of the film F due to the contact with the heater belt 16a, and thus generation of wrinkles and sealing failure along the longitudinal seal portion Fl can be prevented. As shown in Figures 2 through 4, the heater block 16b is a rectangular parallelepiped shaped metal block, and has a built-in heater bar 16e that generates heat, on the side where the heater belt 16a and the film F come into contact with each other. L5 Further, the heater block 16b is adjacently disposed to the inner side of the heater belt 16a along the surface of the heater belt 16a in the longitudinal direction, and heats the heater belt 16a to 140 to 150 degrees C. Note that the heater bar 16e is not built in on the back side of the heater block 16b, but the entire heater block 16b is made of a metal having a high thermal conductivity, so that the temperature on the back side is also heated to about 20 130 degrees C. In addition, as shown in Figure 3, similar to the surface fastener 13c, the heater block 16b has the width d3 (a dl) substantially equal to the width d (see Figure 2) of the longitudinal seal portion Fl of the film F in the plane view. Consequently, from the heater block 16b to the heater belt 16a, a sufficient amount of heat to perform the sealing process is applied only to the portion within the width d of the longitudinal seal portion Fl. 25 On the other hand, because the heater block 16b is not adjacently disposed in the areas on the outer sides of the portion of the heater belt 16a corresponding to the width d of the longitudinal seal portion Fl, the amount of heat applied to the areas on the outer sides is significantly reduced. Thus, the temperature gradient is created in which the temperature is reduced from the center to the both sides on the surface of the heater belt 16a (see the 30 graph in Figure 8). As shown in Figures 2 and 4, the two pulleys 16c are disposed on the inner side of the heater belt 16a. The transmitted torque from a motor (not shown) causes the pulleys 16c to rotate about a rotation shaft 16f (see Figure 6), which consequently rotates the heater belt 16a in the longitudinal direction. 11 Note that the inner side of the heater belt 16a refers to the surface inside the endless belt supported by the pulleys 16c, and the outer side of the heater belt 16a refers to the surface on the side where longitudinal sealing is performed by being brought into contact with the film F. In addition, the back side of the heater block 16b refers to the side 5 opposite to the side where the heater bar 16e is built in and longitudinal sealing is performed. <TRANSVERSE SEALING MECHANISM 17> The transverse sealing mechanism (transverse seal portion) 17 is disposed below the forming mechanism 13, the pull down belt mechanism 14, and the longitudinal sealing 10 mechanism 15. The transverse sealing mechanism 17 has a pair of sealing jaws 51 each with a built-in heater (see Figure 7). One of the pair of sealing jaws 51 is located at the front side of the tubular film and the other one at the back side thereof, and as shown in Figure 7, they circulate so as to produce generally D shaped trajectories T that are front-to-back symmetric. Further, in the course of the circulatory movement, the tubular 15 film is sandwiched between the pair of sealing jaws 51 as they push against each other. The sealing jaws 51 apply pressure and heat to a portion of the tubular film which becomes the upper and lower ends of a bag in order to seal the portion. One of the sealing jaws 51 located at the front side of the tubular film is supported by a shaft 17c so as to rotate about the shaft 17c. The shaft 17c is rotated via a gear by the operation of a motor for circulation 20 (not shown) and is also horizontally moved front to back via a ball screw mechanism (not shown) by the operation of a motor for movement of the shaft. In addition, similarly, one of the sealing jaws 51 located at the back side of the tubular film is also rotated via a gear by the operation of the motor for circulation and is also horizontally moved front to back by the operation of the motor for movement of the shaft. In this way, as the pair of sealing 25 jaws 51 is rotated and horizontally moved, the generally D shaped trajectories T of the sealing jaws 51 are produced. In addition, through the torque control of the motor for movement of the shaft, the pressure at the time when the pair of sealing jaws 51 sandwiches the tubular film therebetween is adjusted. In addition, a cutter (not shown) is built-in in one of the pair of sealing jaws 51. 30 This cutter fulfils the role to cut off the bag B from the following tubular film at the central position in the height direction of the transverse seal portion formed by the sealing jaws 51. <CONTROL UNIT 20> As shown in Figure 1, the control unit 20 is connected to the longitudinal sealing 12 mechanism 15 and the like. Further, the control unit 20 is connected to the heater block 16b (heater bar 16e) included in the longitudinal sealing mechanism 15. In accordance with a detection result of a temperature sensor (not shown) that detects the temperature of the heater block 16b, the control unit 20 adjusts the amount of heat applied to the heater 5 belt 16a from the heater bar 16e (heater block 16b), in other words, the control unit 20 controls the set temperature of the heater block 16b, and also controls the operation of the entire bag manufacturing and packaging apparatus 1. <CHARACTERISTIC OF BAG MANUFACTURING AND PACKAGING APPARATUS 1> LO (1) With the bag manufacturing and packaging apparatus I in this embodiment, as shown in Figure 3 and the like, the heater belt 16a and the heater block 16b which constitute the longitudinal sealing mechanism 15 and the surface fastener 13c disposed on the forming mechanism 13 side are disposed such that the amount of heat per unit time applied to the areas on both outer sides of the longitudinal seal portion F1 of the film F is .5 reduced. Accordingly, while a sufficient amount of heat and pressure to perform the sealing process are applied to the longitudinal seal portion F1 of the film F, it is possible to prevent an excess amount of heat from being applied to the areas on both outer sides of the longitudinal seal portion Fl. As a result, it is possible to prevent degradation of the 20 appearance of the product caused by generation of wrinkles and the like along the longitudinal seal portion F1 which occurs when an amount of heat and pressure per unit time necessary for the sealing process are applied also to the surrounding of the longitudinal seal portion Fl. (2) 5 With the bag manufacturing and packaging apparatus 1 in this embodiment, as shown in Figure 3, as the constituent members that apply the amount of heat and pressure to the longitudinal seal portion F1 of the film F to perform the sealing process, the surface fastener 13c and the heater block 16b respectively having the width dl and the width d3 substantially equal to the width d of the longitudinal seal portion Fl, and the heater belt 30 16a having the width d2 larger than those widths d, dl, and d3 are used. Accordingly, on the longitudinal seal portion F1 of the film F which is sandwiched between the surface fastener 13c and the heater belt 16a, a large amount of heat and pressure are applied to the area within the width dl of the surface fastener 13c. On the other hand, although the areas on both outer sides of the width dl come into contact with 13 the heater belt 16a having the width wider than the surface fastener 13c, the amount of heat and pressure necessary to perform the sealing process are not applied thereto because the temperature gradient as shown in Figure 8 is created on the heater belt 16a in the width direction and the surface fastener 13c as a counterpart of the heater belt 16a to sandwich 5 the film F therebetween is not present on the heater belt 16a. In particular, in the areas on both outer sides of the surface fastener 13c, the film F wound around the tube 13b whose cross sectional shape is generally circular comes off from the surface of the heater belt 16a, so that the amount of heat and pressure are prevented from being excessively applied to the film F. LO As a result, it is possible to prevent generation of wrinkles and the like along the longitudinal seal portion F1 which occurs when an excess amount of heat and pressure are applied to the both outer sides of the longitudinal seal portion F1 from the heater belt 16a, and thus degradation of the appearance of the product can be prevented. (3) t5 With the bag manufacturing and packaging apparatus I in this embodiment, as shown in Figure 3, the surface fastener 13c has the width substantially equal to the width d of the longitudinal seal portion F . Accordingly, because the surface fastener 13c facing the heater belt 16a is not present in the areas on both outer sides of the longitudinal seal portion Fl, the amount of M0 heat and pressure per unit time applied to the film F from the heater belt 16a are significantly lower in the areas on both outer sides than in the area of the longitudinal seal portion Fl. In particular, in the areas on both outer sides of the surface fastener 13c, the film F wound around the tube 13b whose cross sectional shape is generally circular comes off 25 from the surface of the heater belt 16a. Thus, the amount of heat and pressure are not excessively applied to the film F. As a result, it is possible to prevent generation of wrinkles and the like along the longitudinal seal portion F1 which occurs when the same amount of heat and pressure that are applied to perform the sealing process are applied to the both outer sides of the 30 longitudinal seal portion F1 from the heater belt 16a, and thus degradation of the appearance of the product can be prevented. <OTHER EMBODIMENT> An embodiment of the present invention has been described as above, however, the present invention is not limited to the above embodiment, and various changes and 14 modifications can be made herein without departing from the scope of the invention. (A) The above embodiment is described, as shown in Figure 3, taking an example in which the width dl of the surface fastener 13c and the width d3 of the heater block 16b are 5 set substantially equal to the width d (see Figure 2) of the longitudinal seal portion Fl, and the width d2 of the heater belt 16a is set larger than these widths d, dl, and d3. However, the present invention is not limited thereto. For example, as shown in Figure 9, the width dl of the surface fastener 3c may be set substantially equal to the width d of the longitudinal seal portion F1, and the width 10 d2 of the heater belt 16a and a width d4 of a heater block 11 6b may be set larger than these widths d and dl. Also in this case, because the width dl of the surface fastener 13c is set substantially equal to the width d of the longitudinal seal portion Fl, the width of the overlapped portion F2 sandwiched between the heater belt 16a and the surface fastener 13c .5 is substantially equal to the width d of the longitudinal seal portion Fl. As a result, because the amount of heat is locally applied to the portion corresponding to the longitudinal seal portion F1 from the heater belt 16a, generation of problems such as wrinkles, sealing failure, and the like in the surrounding of the longitudinal seal portion can be prevented, and thus the same effect as described above can be obtained. 0 However, in view of the fact that creating the above described temperature gradient on the surface temperature of the heater belt 16a can prevent the amount of heat per unit time from being excessively applied to portions other than the longitudinal seal portion Fl, it is preferred that the width d3 of the heater block is set substantially equal to the width d of the longitudinal seal portion F1, as is the case with the above embodiment. 5 (B) The above embodiment is described taking an example in which the surface fastener 13c whose contact surface that contacts the film F is flat is used as the receiving member that sandwiches the overlapped portion F2 of the film F against the heater belt 16a and performs the sealing process. However, the present invention is not limited thereto. 0 For example, as shown in Figure 10(a), a surface 113ca corresponding to the contact surface that contacts the film may be formed in a curved shape, as the cross sectional shape of a surface fastener 113c, and the overlapped portion F2 of the film F may be sandwiched between this curve shaped surface 113ca and the heater belt 16a for the sealing process. 15 In this case, a sufficient amount of heat and pressure per unit time are applied to the film F in the area near the center portion corresponding to the width d of the longitudinal seal portion Fl, and at the same time, it is possible to reduce the pressure applied to the areas on the outer side of the longitudinal seal portion Fl. As a result, it is 5 possible to prevent an excess amount of heat and pressure from being applied to the surrounding areas of the longitudinal seal portion F1 of the film F by the shape of the surface fastener 113c, regardless of the width of the heater belt and the heater block that the surface fastener 113c faces. Thus, generation of wrinkles and sealing failure in the surrounding of the longitudinal seal portion can be easily prevented by a simple 10 configuration. Further, as the cross sectional shape of the receiving member, as shown in Figure 10(b), the center portion of the curve shaped surface 113ca of the surface fastener 113c may be formed as a flat surface 213ca, and curve shaped surfaces 213cb may be formed on both sides of the flat surface 213ca. L5 In this case, the amount of heat and pressure can be evenly applied to the area having a width corresponding to the longitudinal seal portion Fl, and at the same time, the amount of heat and pressure applied to the surrounding areas on both sides can be reduced. Thus, generation of wrinkles and sealing failure in the surrounding of the longitudinal seal portion can be easily prevented by a simple configuration. W0 (C) The above embodiment is described taking an example in which a generally rectangular parallelepiped heating element is used as the heater block 16b disposed adjacently to the heater belt 16a. However, the present invention is not limited thereto. For example, as shown in Figure 11, a heater block 116c whose cross sectional 25 shape is generally T shaped may be used, and a portion l I6ca whose width of the generally T shape is wider may be disposed to the heater belt 16a on the side that comes into contact with the overlapped portion F2 of the film F. In this case, with the portion 116ca whose width is wider, the temperature at both ends that are not continuous with a portion 116cb on the narrow width side tends to be 30 lower than the temperature at the center portion. Consequently, a temperature gradient in which the temperature is reduced from the center portion to the both ends can be created on the generally T shaped heater block 116c. As a result, generation of wrinkles, sealing failure, and the like in the surrounding of the longitudinal seal portion can be easily prevented by a simple configuration. 16 (D) The above embodiment is described taking an example in which the heater belt whose contact surface that contacts the film F is flat is used as the heater belt 16a that sandwiches the overlapped portion F2 of the film F against the surface fastener 13c as the 5 receiving member and performs the sealing process. However, the present invention is not limited thereto. For example, as shown in Figure 12, the heater belt 16a whose surface on the side that comes into contact with the overlapped portion F2 of the film F is formed as a curve shaped surface ll6aa may be used. t0 In this case, the amount of heat and pressure per unit time applied to the film F from the center portion of the curve shaped surface 116aa can be made larger than the amount of heat and pressure applied to the both ends thereof. As a result, by positioning the center portion of the longitudinal seal portion based on the center portion of the curve shaped surface 116aa, while a sufficient amount of heat and pressure are applied to the 5 longitudinal seal portion, such sufficient amount of pressure can be prevented from being applied to the surrounding areas at both ends of the longitudinal seal portion. Further, as is the case with a surface fastener 213c in Figure 10(b), the heater belt 16a having a flat surface formed in the vicinity of the center portion of the curved surface may also be used. 0 (E) The above embodiment is described taking an example in which the sealing process is performed in a manner that the overlapped portion F2 of the film F is sandwiched between the surface fastener 13c and the heater block 16b. However, the present invention is not limited thereto. 5 As a mode to perform the sealing process, for example, the sealing process may be performed in a manner that the seal portion is sandwiched by fins. Also, as the overlapped portion, a portion where films simply overlap with each other without having a folded portion formed thereon may be subjected to the sealing process. (F) 0 The above embodiment is described taking an example in which the surface fastener 13c that sandwiches the overlapped portion F2 of the film F against the heater belt 16a is disposed on the forming mechanism 13 side instead of the longitudinal sealing mechanism 15 side. However, the present invention is not limited thereto. Because the surface fastener is an essential element for the longitudinal sealing 17 process, it can be considered as the constituent member on the longitudinal sealing mechanism 15 side. (G) The above embodiment is described taking an example in which the heater belt 5 16a is used as the contact section that comes into contact with the longitudinal seal portion of the film F and thermally seals the portion. However, the present invention is not limited thereto. For example, as shown in Figure 13, it may be a type of longitudinal sealing mechanism in which a heater block 216b integrally formed with the heating section of the o heater and the like is intermittently operated in a manner that the heater block 216b is pressed against the overlapped portion F2 of the film F so as to longitudinally seal the portion. INDUSTRIAL APPLICABILITY The longitudinal sealing mechanism of the present invention is capable of 5 preventing the both sides of the longitudinal seal portion from being excessively heated, so that the effect of preventing generation of problems such as wrinkles, sealing failure, and the like along the longitudinal seal portion is obtained. Thus, the present invention is widely applicable to various types of sealing devices that perform sealing while conveying packaging materials. 18

Claims (8)

1. A longitudinal sealing mechanism that conveys a packaging material formed into a tubular shape and seals an overlapped portion of the packaging material, comprising: a contact section configured to come into contact with the overlapped 5 portion of the packaging material, the overlapped portion being formed along a conveying direction of the packaging material; a heating section configured to heat the contact section; and a receiving member configured to sandwich the packaging material against the contact section and perform longitudinal sealing; L0 the contact section, the heating section, and the receiving member being configured such that the amount of heat per unit time applied to the packaging material from the contact section is reduced in a direction toward both sides of the longitudinal seal portion in a direction crossing the conveying direction of the packaging material. L5
2. The longitudinal sealing mechanism according to claim 1, wherein the heating section and the receiving member each have a width substantially equal to the width of the longitudinal seal portion formed on the packaging material, and the contact section has a width larger than the width of the longitudinal seal portion.
3. The longitudinal sealing mechanism according to claim 1, wherein the receiving member has a width substantially equal to the width of the longitudinal seal portion.
4. The longitudinal sealing mechanism according to claim 1, wherein 25 the receiving member has a curved contact surface whose both sides in a width direction come apart from the contact section.
5. The longitudinal sealing mechanism according to claim 1, wherein the contact section has a curved surface from which the packaging material comes apart in an area on an outer side of a contact portion that contacts the longitudinal 30 seal portion.
6. The longitudinal sealing mechanism according to any one of claims 1 through claim 5, wherein the heating section is formed such that the cross sectional shape in a plane perpendicular to the conveying direction of the packaging material is generally T 19 shaped, and a projection-side surface of the T shape is disposed adjacently to the contact section.
7. The longitudinal sealing mechanism according to any one of claims 1 through claim 6, wherein 5 the contact section is a rotational band structure that rotates around the heating section.
8. The longitudinal sealing mechanism according to any one of claims 1 through claim 6, wherein the contact section is a heater block integrally formed with the heating section. 20
AU2007305506A 2006-10-13 2007-10-05 Longitudinal sealing mechanism Abandoned AU2007305506A1 (en)

Applications Claiming Priority (3)

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JP2006280335A JP2008094456A (en) 2006-10-13 2006-10-13 Vertical seal mechanism
JP2006-280335 2006-10-13
PCT/JP2007/069628 WO2008044662A1 (en) 2006-10-13 2007-10-05 Vertical seal mechanism

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BR (1) BRPI0719171A2 (en)
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BRPI0719171A2 (en) 2014-04-15
WO2008044662A1 (en) 2008-04-17
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GB2455949B (en) 2011-06-15
GB2455949A (en) 2009-07-01
JP2008094456A (en) 2008-04-24

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Free format text: THE NATURE OF THE AMENDMENT IS: AMEND THE INVENTION TITLE TO READ LONGITUDINAL SEALING MECHANISM

MK4 Application lapsed section 142(2)(d) - no continuation fee paid for the application