JP4514903B2 - Sealing method, sealing device, and bag manufacturing method - Google Patents

Sealing method, sealing device, and bag manufacturing method Download PDF

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Publication number
JP4514903B2
JP4514903B2 JP2000174382A JP2000174382A JP4514903B2 JP 4514903 B2 JP4514903 B2 JP 4514903B2 JP 2000174382 A JP2000174382 A JP 2000174382A JP 2000174382 A JP2000174382 A JP 2000174382A JP 4514903 B2 JP4514903 B2 JP 4514903B2
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JP
Japan
Prior art keywords
seal
sealing
film
rolls
roll
Prior art date
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Expired - Fee Related
Application number
JP2000174382A
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Japanese (ja)
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JP2001354210A (en
Inventor
澄 佐々木
弘之 松井
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.)
Fujimori Kogyo Co Ltd
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Fujimori Kogyo Co Ltd
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Priority to JP2000174382A priority Critical patent/JP4514903B2/en
Publication of JP2001354210A publication Critical patent/JP2001354210A/en
Application granted granted Critical
Publication of JP4514903B2 publication Critical patent/JP4514903B2/en
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Expired - Fee Related legal-status Critical Current

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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
    • 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
    • B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
    • B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
    • 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
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/32—Measures for keeping the burr form under control; Avoiding burr formation; Shaping the burr
    • B29C66/324—Avoiding burr formation
    • B29C66/3242—Avoiding burr formation on the inside of a tubular or hollow article
    • 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
    • B29C66/345—Progressively making the joint, e.g. starting from the middle
    • B29C66/3452—Making complete joints by combining partial joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • 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
    • B29C66/432—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
    • 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
    • B29C66/81413—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 non-symmetrical
    • 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
    • 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
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8226—Cam mechanisms; Wedges; Eccentric mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—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
    • B29C66/83513—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums cooperating jaws mounted on rollers, cylinders or drums and moving in a closed path
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • B29C66/92441—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time
    • B29C66/92443—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile
    • B29C66/92445—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power the pressure, the force or the mechanical power being non-constant over time following a pressure-time profile by steps
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between the joining 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
    • B29C66/90—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
    • 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
    • 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
    • B29C66/939—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges
    • B29C66/9392—Measuring or controlling the joining process by measuring or controlling the speed characterised by specific speed values or ranges in explicit relation to another variable, e.g. speed diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72327—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—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
    • B29C66/73921—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 characterised by the materials of both parts being thermoplastics

Description

【０００１】
【発明の属する技術分野】
この発明は、樹脂製のフィルムにシールを施すシール方法及びシール装置、並びにこのシール方法により袋体を製造する方法に関する。更に詳しくは、特に自動充填製袋機における横シールを適正に施して、充分なシール強度を付与可能とするシール方法及びシール装置、並びにこのシール方法により横シールを施す袋体の製造方法に関する。
【０００２】
【従来の技術】
食品や薬剤等の内容物を包装する袋体は、熱融着性を有する樹脂製のフィルム、あるいは、これに紙層やアルミニウム層等を積層したフィルムを用いて製造される。
【０００３】
上記フィルムに内容物を充填しつつ袋体を製袋するため、従来より例えば図４に示す充填製袋機５０が用いられている。図４において、符号５１ａ，５１ｂは縦シールロールで、縦シールロール５１ａ，５１ｂは、左右一対の平行な軸５２と、その両端にそれぞれ設けられた、ヒータを内蔵するシールリング５３とを備えている。縦シールロール５１ａ，５１ｂのシールリング５３はその外周面にて互いに対向し、これら対向するシールリング５３間に、重ね合わされた２枚のフィルム５４の両端部がそれぞれ挟持される。
【０００４】
縦シールロール５１ａ，５１ｂの下方には、左右一対の平行な横シールロール（シールロール）５５ａ，５５ｂが配置されている。個々の横シールロール５５ａ，５５ｂは、ロール本体５６と、ロール本体５６の外周面から、ロール本体５６の周方向に沿って等間隔で突出する、ヒータを内蔵する複数（図では３本）のシールバー５７とを備えている。これらシールバー５７は、ロール本体５６の軸線方向に延設されるとともに、後述するように横シールロール５５ａ，５５ｂを回転させた際に、対向するシールバー５７間に、上記フィルム５４が間欠的に挟持される。
【０００５】
上記各一対の縦シールロール５１ａ，５１ｂ及び横シールロール５５ａ，５５ｂは、上方からこれらシールロール５１ａ，５１ｂ，５５ａ，５５ｂ間に挿通されたフィルム５４の下方への移動に同期して、逆方向に回転駆動される。すなわち、縦シールロール５１ａ及び横シールロール５５ａは、図の右方向に回転するように、縦シールロール５１ｂ及び横シールロール５５ｂは、図の左方向に回転するようにそれぞれ駆動される。
【０００６】
符号５８は内容物供給用のノズルで、ノズル５８は２枚のフィルム５４間に上方から挿入され、その先端は、縦シールロール５１ａ，５１ｂの設置位置と横シールロール５５ａ，５５ｂの設置位置との中間に開口している。
【０００７】
フィルム５４は、製袋機５０により、内容物が充填された袋体６１に加工される。その工程を以下に示す。上方から縦シールロール５１ａ，５１ｂ間に挿通された２枚のフィルム５４は、縦シールロール５１ａ，５１ｂ間にて互いに重ね合わされるとともに、フィルム５４の両端部が、縦シールロール５１ａ，５１ｂの対向するシールリング５３間にそれぞれ挟持される。その結果、フィルム５４の両端部に、２枚のフィルム５４を、シールリング５３から印加された熱により長手方向に沿ってシール（縦シール）してなる縦シール部５４Ａが形成される。
【０００８】
縦シール後のフィルム５４は、横シールロール５５ａ，５５ｂ間に挿通され、横シールロール５５ａ，５５ｂ間を、図５に示す過程を経て通過し、その結果、フィルム５４には、フィルム５４を横断する横シール部５４Ｂが形成される。
【０００９】
図５は、横シール部５４Ｂの形成に伴うシールバー５７の位置関係の変化を説明したもので、図中矢印Ｃは横シールロール５５ａ，５５ｂの回転方向を示す。上記一対のシールバー５７は、図５に５７（α）で示す位置において互いに近接する。そして、５７（β）で示す位置を通過した後、５７（γ）で示す位置に達し、その後互いに離間する。フィルム５４は、符号５７（α）で示す位置（シール開始時）から符号５７（γ）で示す位置（シール終了時）に至る間、対向するシールバー５７間に挟持された状態でシールバー５７から印加された熱によりシールされ、その結果、対向するフィルム５４同士が熱融着されることにより、横シール部５４Ｂが形成される。
【００１０】
また、横シール部５４Ｂの形成に伴い、横シールロール５５ａ，５５ｂの上方（図４に符号Ａで示す位置）に位置する２枚のフィルム５４間には、ノズル５８から内容物が供給される。この内容物は、２枚のフィルム５４間に形成された、側方及び下方がそれぞれ縦シール部５４Ａ及び横シール部５４Ｂでシールされた空間内に充填される。
【００１１】
そして、符号Ａで示す位置から、横シールロール５５ａ，５５ｂを各々所定角度だけ回転（図では１／３回転）させることにより、フィルム５４が下方に移動するとともに、内容物が充填されたフィルム５４の上部が、隣在するシールバー５７により挟持される。その結果、このシールバー５７に挟持された位置においても同様に横シール部５４Ｂが形成され、図４に符号Ｂで示すように、内容物がシール部５４Ａ，５４Ｂで囲まれた空間内に密閉される。更に、カッター（図示せず）により横シール部５４Ｂの中央を切断することにより、袋体６１が完成する。
【００１２】
【発明が解決しようとする課題】
上述した従来の製袋機５０により形成された袋体６１では、横シール部５４Ｂのうち、シール開始時（図５に符号５７（α）で示す位置）に形成された部分のシール強度が、ともすれば不充分になりがちであり、シール剥離が発生しやすいという問題がある。また、その原因は、シール開始時では、フィルム５４が未加熱なので、フィルム５４とシールバー５７との温度差が大きく、その結果、シールバー５７から横シール部５４Ｂに印加される熱量が不足し、横シール部５４Ｂにおける樹脂の溶融が不充分となるためと考えられる。
【００１３】
一方、横シール部５４Ｂのうち、シール終了時（図５に符号５７（γ）で示す位置）に形成された部分では、溶融した樹脂がシールバー５７によりしごかれて上方に押し出され、２枚のフィルム５４間に、いわゆる「ポリ溜まり」を生じる現象がしばしば観察されている。また、このポリ溜まりは、横シールロール５５ａ，５５ｂの機械的精度等により、偏って形成される場合がある。図６は、横シール部５４Ｂに偏ったポリ溜まり７０が発生した状態を示す図である。
【００１４】
ポリ溜まり７０の近傍では、溶融した樹脂がポリ溜まり７０側に押し出されてしまうため、横シール部５４Ｂに薄い部分（エッジ）７１が生じる。エッジ７１では、横シール部５４Ｂの機械的強度が低下する他、他の部分に比して応力が集中しやすくなり、フィルム切れ等の不良の原因となる可能性があり、特に、図６に示すような偏ったポリ溜まり７０が発生すると、エッジ７１の形成による不良が発生しやすい傾向がある。また、ポリ溜まり７０及びエッジ７１が発生する原因は、シール終了時には、横シール部５４Ｂが既にシールバー５７により充分加熱されている上に、更にシールバー５７による加熱が加わるため、横シール部５４Ｂに対する加熱量が過剰となり、その結果、溶融し過ぎた樹脂が過剰に押し出されるためと考えられる。
【００１５】
本発明は、上記の問題を解決するためになされたもので、横シール部のうち、シール開始時に形成された部分におけるシール剥離や、シール終了時に形成された部分におけるポリ溜まりの発生に起因する不良の発生等がなく、シール開始からシール終了まで均質なシールを行うことができるヒートシール方法及びヒートシール装置、並びにシール開始からシール終了まで均質なシールが施されることにより、充分なシール強度を有する袋体の製造方法を提供することを課題とする。
【００１６】
【課題を解決するための手段】
本発明は、二本一対のシールロールを、個々のシールロールの側面から突出する一対以上のシールバーが、重ね合わせられた熱融着性を有するフィルムを間欠的に挟持するように、互いに逆方向に回転させ、これらシールバー間に挟持されたフィルムを、シールバーを介してフィルムに印加された熱によりシールするシール方法において、一対のシールロールの回転速度を、シール開始時に最小となり、シール終了時に最大となるよう、漸次増加させることにより、シールに際しシールバーを介してフィルムに印加される熱量を、シール開始時に最大となり、シール終了時に最小となるよう、漸次減少させることを特徴としている。
【００１７】
また、本発明は、二本一対のシールロールと、個々のシールロールの側面から突出する一対以上のシールバーと、重ね合わせられた熱融着性を有するフィルムがシールバーにより間欠的に挟持されるように、一対のシールロールを互いに逆方向に回転させる駆動手段とを備え、これらシールバー間に挟持されたフィルムを、シールバーを介してフィルムに印加された熱によりシールするシール装置において、一対のシールロールの回転速度を、シール開始時に最小となり、シール終了時に最大となるよう、漸次増加させることにより、シールに際しシールバーを介してフィルムに印加される熱量を、シール開始時に最大となり、シール終了時に最小となるよう、漸次減少させることを特徴としている。
【００１８】
この場合、例えば、シールロールの回転速度の変化に同期して、フィルムの移動速度を変化させる。
【００１９】
あるいは、フィルムを挟持するシールバーの間隔を、シール開始時に最小となり、シール終了時に最大となるよう、漸次拡大させることにより、シールに際しシールバーを介してフィルムに印加される前記熱量を漸次減少させる。
【００２０】
フィルムを挟持するシールバーの間隔を漸次拡大させる具体的方法としては、例えば、これら一対のシールロールの回転中心間の距離を、シール開始時に最小となり、シール終了時に最大となるよう漸次拡大させるか、あるいは、個々のシールバーの表面を、シールロールの回転方向に沿って、シールロールの回転中心側に漸次後退させる方法等が挙げられる。
【００２１】
更に、本発明は、重ね合わせられた複数枚の熱融着性を有するフィルムをシールして得られる袋体の製造方法において、特に、上記したシール方法によって横シール部を形成することをも特徴としている。
この場合、例えば、前記シールロールの回転速度の変化に同期して、前記フィルムの移動速度を変化させるとともに、前記フィルムの移動速度に対応すべきその他の部材の回転速度も、前記シールロールの回転速度の変化に同期して変化させる。
【００２２】
【発明の実施の形態】
以下、図面に基づき、本発明の実施形態を説明する。なお、以下の記載中、上記図４及び図５に示した部材と同様の構成を有する部材については、図４及び図５に示した部材と同一の符号を付してその説明を省略する。
【００２３】
本発明の一実施形態を図１を参照して説明する。本実施形態は、図４及び図５に示す充填製袋機５０を用いて、横シールロール５５ａ，５５ｂの回転速度を、図１に示すごとく変化させたものである。図１において、α、γは、シールバー５７が各々図５における５７（α）、５７（γ）の位置をとる時点、すなわち、横シールにおけるシール開始時とシール終了時とをそれぞれ示している。
【００２４】
図１に示すように、本実施形態では、横シールロール５５ａ，５５ｂの回転速度が、シール開始時の初期速度から徐々に加速され、シール終了時に最も速くなるよう設定されている。シール終了後は、次の一対のシールバー５７による横シールの開始前に、横シールロール５５ａ，５５ｂの回転速度を初期速度まで戻す。また、図４及び図５に示す充填製袋機５０の場合、一つの横シールロール５５ａ，５５ｂに設けられているシールバーが３本なので、図中矢印で示すように、横シールロール５５ａ，５５ｂは、１回転あたり、上記した加速と減速とを３回繰り返すようになっている。
【００２５】
本実施形態においても、従来技術と同様に、フィルム５４の移動速度と、横シールロール５５ａ，５５ｂの回転速度と同期させる必要があるのはもちろんである。従って、本実施形態の実施に際しては、横シールロール５５ａ，５５ｂの回転速度変化に同期して、フィルム５４の移動速度や縦シールロール５１ａ，５１ｂの回転速度も変化させる。また、充填製袋機５０が、フィルムの繰り出しロールや引きロール、冷却ロール等、フィルムの移動速度に対応すべきその他の部材を備えている場合には、これらの部材の回転速度等も、当然横シールロール５５ａ，５５ｂの回転速度変化に同期して変化させる。
【００２６】
本実施形態において、横シールロール５５ａ，５５ｂの駆動手段に特に限定はないが、ステッピングモータのようなサーボモータが特に好適に使用できる。ステッピングモータを使用した場合、横シールロール５５ａ，５５ｂの回転速度はミクロ的に見ればステップ状に変化するが、マクロ的に見た場合にはなだらかとなるように変化させることが望ましい。なお、本実施形態では、横シールロール５５ａ，５５ｂの回転速度を直線的に変化させたが、より均一な加熱、均一なヒートシールを目的として、横シールロール５５ａ，５５ｂの回転速度の変化率を適宜変化させてもかまわない。
【００２７】
本実施形態によれば、シール開始時、すなわち対向するシールバー５７によるフィルム５４の挟持開始時における横シールロール５５ａ，５５ｂの回転速度が遅いため、未加熱状態のフィルム５４を充分に加熱し、必要な強度のシールを施すことができる。従って、本実施形態によれば、横シール部５４Ｂのうち、シール開始時に形成された部分におけるシール剥離等を防止できる。
【００２８】
また、横シールロール５５ａ，５５ｂの回転速度がシール終了時に近づく程速くなるため、シールバー５７との接触に伴いシールバー５７からフィルム５４に印加される熱量が、シール終了時に近づく程減少する。従って、既にシールバー５７により充分加熱されている横シール部５４Ｂに、シールバー５７を介して更に加熱される加熱量が少なくて済み、その結果、シール部５４Ｂに対する加熱量が過剰とならず、ポリ溜まり７０及びエッジ７１の発生が最少に抑制される。
【００２９】
よって、本実施形態によれば、横シール部５４Ｂの形成に際し、シール開始時におけるシール剥離や、シール終了時におけるポリ溜まりの発生に起因する不良の発生等がなく、シール開始からシール終了まで均質な横シールを行うことができる。
【００３０】
本発明の他の実施形態を図２を参照して説明する。本実施形態は、図４及び図５に示す充填製袋機５０において、横シールロール５５ａ，５５ｂに換えて、図２に示す横シールロール（シールロール）１ａ，１ｂを用いたものである。図２は、横シールロール１ａ，１ｂを示す正面図で、（ａ）はシール開始時、（ｂ）は、シール途中、（ｃ）は、シール終了時の状態をそれぞれ示している。
【００３１】
本実施形態の横シールロール１ａ，１ｂは、上記した横シールロール５５ａ，５５ｂと同様、一対のロール本体２と、ロール本体２の外周面から、その周方向に沿って等間隔で突出する、ロール本体２の軸線方向に延設された３本のシールバー３とから構成されている。横シールロール１ａの回転中心Ｐ１は、対をなす横シールロール１ｂに近接離間する方向（図の左右方向）に変位可能とされ、かつ図示しない付勢手段により、対をなす横シールロール１ｂ側（図の左側）に付勢されている。
【００３２】
符号９は、横シールロール１ａの端面に、横シールロール１ａと同軸をなすよう固定されたカム、符号１０は、カム９の外周面に、横シールロール１ｂ側から接触するカム板である。カム９は、カム板１０に外周を接触させつつ回転し、その回転中心Ｐ１から外周面までの距離に応じて、横シールロール１ａを、対をなす横シールロール１ｂに近接離間する方向に変位させるようになっている。具体的には、図に符号９ａで示すように、カム９の外周面が、個々のシールバー３の径方向内方に相当する箇所にて、それぞれ横シールロール１ａの回転方向後方側に向け、径方向外方に漸次突出している。一方、横シールロール１ｂの構造は横シールロール５５ａと同様で、その回転中心Ｐ２は定位置に保持されている。
【００３３】
そして、横シールロール１ａ，１ｂの回転に伴い対向するシールバー３間に、重ね合わされた複数枚のフィルム５４を挟持することにより、フィルム５４が、シールバー３から印加された熱によりシールされ、対向するフィルム５４同士が熱融着し、横シール部５４Ｂが形成される。
【００３４】
この場合、図２（ａ）に示すように、シール開始時では、カム９が、その回転中心Ｐ１から外周面までの距離ｄが最小となる位置でカム板１０に接触しているため、横シールロール１ａが、対をなす横シールロール１ｂ側に変位し、回転中心Ｐ１，Ｐ２の距離が最小となる。従って、フィルム５４を挟んで対向するシールバー３の間隔も最小となり、フィルム５４は、互いに接近したシールバー３により両側から充分に加熱されるとともに、シールバー３により比較的強く加圧される。その結果、横シール部５４Ｂのうち、シール開始時に形成された部分にも、必要なシール強度が付与され、この部分におけるシール剥離等が防止される。
【００３５】
また、図２（ｂ）に示すように、シール途中では、上記した距離ｄがシール開始時に比べやや長くなるので、横シールロール１ａが、対をなす横シールロール１ｂ側から若干離間する方向に変位し、回転中心Ｐ１，Ｐ２が、シール開始時よりも離間する。従って、フィルム５４を挟んで対向するシールバー３の間隔もシール開始時より大きくなり、シールバー３によりフィルム５４に印加される熱量が、シール開始時より低下する。しかしながら、フィルム５４は、シール開始時に予め加熱されているため、印加される熱量が低下しても、フィルム５４に印加される全体的な熱量の過不足は生じない。また、シールバー３によるフィルム５４の加圧もやや軽減され適度なものとなる。そのため、横シール部５４Ｂのうち、シール途中で形成された部分にも、適切なシール強度が付与される。
【００３６】
また、図２（ｃ）に示すように、シール終了時では、カム９が、その回転中心Ｐ１から外周面までの距離ｄが最大となる位置でカム板１０に接触しているため、横シールロール１ａが、対をなす横シールロール１ｂ側から最も離間するよう変位し、回転中心Ｐ１，Ｐ２の距離が最大となる。従って、フィルム５４を挟んで対向するシールバー３の間隔も最大となり、シールバー３によりフィルム５４に印加される熱量が最小となる。しかしながら、フィルム５４は、シール開始からシール終了に至るまでの間にシールバー３から印加された熱量により既に充分加熱されているため、印加される熱量が低下しても、フィルム５４に印加される全体的な熱量の過不足は生じない。また、シールバー３によるフィルム５４の加圧も最小となるので、シールバー３によりしごかれて押し出される樹脂量も最小限で済む。そのため、横シール部５４Ｂのうち、シール終了時に形成された部分にも、適切なシール強度が付与され、特に、溶融し過ぎた樹脂が過剰に押し出されることによる、不要なポリ溜まりやエッジの発生が防止される。
【００３７】
よって、本実施形態においても、横シール部５４Ｂの形成に際し、シール開始時におけるシール剥離や、シール終了時におけるポリ溜まりの発生に起因する不良の発生等がなく、シール開始からシール終了まで均質な横シールを行うことができる。
【００３８】
なお、本実施形態において、横シールロール１ａの回転中心Ｐ１を変位させる手段としてカムを用いたが、横シールロール１ａの回転用の駆動手段とは独立した専用の駆動手段を用いて、横シールロール１ａの回転中心Ｐ１を変位させてもよい。また、横シールロー１ｂの回転中心Ｐ２を、横シールロール１ａと同様に変位可能としてもよい。
【００３９】
本発明の更に他の実施形態を図３を参照して説明する。本実施形態は、図４及び図５に示す充填製袋機５０において、横シールロール５５ａ，５５ｂに換えて、図３に示す横シールロール（シールロール）１ｃ，１ｄを用いたものである。図３は、横シールロール１ｃ，１ｄを示す正面図で、（ａ）はシール開始時、（ｂ）は、シール途中、（ｃ）は、シール終了時の状態をそれぞれ示している。
【００４０】
本実施形態の横シールロール１ｃ，１ｄは、上記した横シールロール５５ａ，５５ｂと同様、一対のロール本体２ａと、ロール本体２ａの外周面から、その周方向に沿って等間隔で突出する、ロール本体２ａの軸線方向に延設された３本のシールバー３ａとから構成されている。また、個々のシールバー３ａの表面３１は、横シールロール１ｃ，１ｄの回転方向に沿って、横シールロールの回転中心Ｑ側に漸次後退する傾斜面とされている。
【００４１】
そして、横シールロール１ｃ，１ｄの回転に伴い対向するシールバー３ａ間に、重ね合わされた複数枚のフィルム５４を挟持することにより、フィルム５４が、シールバー３ａから印加された熱によりシールされ、対向するフィルム５４同士が熱融着し、横シール部５４Ｂが形成される。
【００４２】
この場合、図３（ａ）に示すように、シール開始時では、個々のシールバー３ａの表面３１から回転中心Ｑまでの距離が最大となるため、フィルム５４を挟んで対向するシールバー３ａの間隔が最小となる。従って、フィルム５４は、互いに接近したシールバー３ａにより両側から充分に加熱されるとともに、シールバー３ａにより比較的強く加圧される。その結果、横シール部５４Ｂのうち、シール開始時に形成された部分にも、必要なシール強度が付与され、この部分におけるシール剥離等が防止される。
【００４３】
また、シールバー３ａの表面３１は、横シールロール１ｃ，１ｄの回転方向に沿って、横シールロールの回転中心Ｑ側に漸次後退する傾斜面とされているため、図３（ｂ）に示すように、シール途中では、フィルム５４を挟んで対向する表面３１の間隔が、シール開始時よりも大きくなり、シールバー３ａによりフィルム５４に印加される熱量が、シール開始時より低下する。しかしながら、フィルム５４は、シール開始時に予め加熱されているため、印加される熱量が低下しても、フィルム５４に印加される全体的な熱量の過不足は生じない。また、シールバー３ａによるフィルム５４の加圧もやや軽減され適度なものとなる。そのため、横シール部５４Ｂのうち、シール途中で形成された部分にも、適切なシール強度が付与される。
【００４４】
また、図３（ｃ）に示すように、シール終了時では、フィルム５４を挟んで対向する表面３１の間隔が最大となり、シールバー３ａによりフィルム５４に印加される熱量が最小となる。しかしながら、フィルム５４は、シール開始からシール終了に至るまでの間にシールバー３ａから印加された熱量により既に充分加熱されているため、印加される熱量が低下しても、フィルム５４に印加される全体的な熱量の過不足は生じない。また、シールバー３ａによるフィルム５４の加圧も最小となるので、シールバー３ａによりしごかれて押し出される樹脂量も最小限で済む。そのため、横シール部５４Ｂのうち、シール終了時に形成された部分にも、適切なシール強度が付与され、特に、溶融し過ぎた樹脂が過剰に押し出されることによる、不要なポリ溜まりやエッジの形成が防止される。
【００４５】
よって、本実施形態においても、横シール部５４Ｂの形成に際し、シール開始時におけるシール剥離や、シール終了時におけるポリ溜まりの発生に起因する不良の発生等がなく、シール開始からシール終了まで均質な横シールを行うことができる。
【００４６】
なお、本実施形態において、横シールロール１ｃ，１ｄの回転中心は定位置に固定されたものとしたが、図２に示すようにカム等を用いてシールバー３ａ間の距離を調整可能としてもかまわない。すなわち、シールバー３ａの形状と回転中心の位置調整との双方からシールバー３ａの間隔を調整してもよい。また、横シールロール１ｄを、図４及び図５における横シールロール５５ａ，５５ｂと同様の構造とし、横シールロール１ｃのみによってシールバー３ａの間隔を調整してもよい。
【００４７】
更に、図２及び図３に示す実施形態の横シールロール１ａ〜１ｄの回転速度を、図１に示すように変化させ、シールバー３，３ａの間隔と速度の双方から、フィルム５４に印加される熱量を制御するようにしてもよい。
【００４８】
また、上記した各実施形態の横シールロール１ａ〜１ｄは、図４に示すような、２カ所に縦シールを施した袋体用の製袋機の横シールロールのみならず、縦シールが１カ所のピロー袋やガゼット袋等、他の形態の袋体用の横シールロールにも適用可能で、フィルム５４についても、１枚のフィルムを折り重ねたものや、複数枚のフィルムを重ね合わせたものが使用可能である。なお、ロール本体２，２ａとシールバー３，３ａ，５７の具体的な製法に特に限定はなく、一体的に構成しても、別個に製作したものを溶接等により固定してもよい。また、シールバー３，３ａ，５７の数にも特に限定はなく、各々の横シールロール１ａ〜１ｄに少なくとも１つのシールバー３，３ａ，５７があればよい。また、上記した各実施形態では、いずれも横シールロール１ａ〜１ｄ，５５ａ，５５ｂのシールバー３，３ａ，５７が内蔵するヒータによりフィルム５４を加熱して横シール部５４Ｂを形成するヒートシールが採用されているが、フィルム５４の加熱方式にも限定はなく、シールバー３，３ａ，５７を介してフィルム５４に超音波振動を印加してフィルム５４を加熱し、横シール部５４Ｂを形成する超音波シール等も適宜採用できる。
【００４９】
【発明の効果】
以上、詳細に説明したように、本発明のヒートシール方法及びヒートシール装置によれば、ヒートシールの開始から終了に至るシール部の加熱状況を考慮して、シールロールの回転速度やシールバーの間隔を調整し、シールバーに印加される全体的な熱量を制御するので、フィルムに印加される熱量が、シール部全体で均一となる。その結果、本発明のヒートシール方法及びヒートシール装置によれば、シール開始時におけるシール剥離や、シール終了時におけるポリ溜まりの発生に起因する不良の発生等がなく、シール開始からシール終了まで、均質で、しかも充分なシール強度を有するシール部を有する袋体を得ることができる。
【図面の簡単な説明】
【図１】 本発明の一実施形態であるシールロールの回転速度変化を示すグラフである。
【図２】 本発明の他の実施の形態であるシールロールを示す正面図で、（ａ）はシール開始時、（ｂ）は、シール途中、（ｃ）は、シール終了時の状態を示すものである。
【図３】 本発明の他の実施の形態であるシールロールを示す正面図で、（ａ）はシール開始時、（ｂ）は、シール途中、（ｃ）は、シール終了時の状態を示すものである。
【図４】 本発明が適用可能な充填製袋機の構造の例を示す斜視図である。
【図５】 図４に示す充填製袋機における、横シール部の形成に伴うシールバーの位置関係の変化を説明する図である。
【図６】 横シール部近傍におけるポリ溜まりの発生状況を示すフィルムの一部断面図である。
【符号の説明】
１ａ，１ｂ，１ｃ，１ｄ，５５ａ，５５ｂ 横シールロール（シールロール）
２，２ａ，５６ ロール本体
３，３ａ，５７ シールバー
９ カム
１０ カム板
５４ フィルム
６１ 袋体
Ｐ１，Ｐ２，Ｑ シールロールの回転中心[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a sealing method and a sealing device for sealing a resin film, and the sealing method.Method for manufacturing a bagAbout. More specifically, a sealing method and a sealing device capable of giving a sufficient seal strength by appropriately performing a lateral seal particularly in an automatic filling bag making machine, and thisstickerHorizontal seal depending on the methodTheOutTheBagManufacturing methodAbout.
[0002]
[Prior art]
A bag for packaging contents such as foods and drugs is manufactured using a resin film having heat-fusibility or a film obtained by laminating a paper layer, an aluminum layer, or the like.
[0003]
Conventionally, for example, a filling bag making machine 50 shown in FIG. 4 has been used to make a bag while filling the film with contents. In FIG. 4, reference numerals 51 a and 51 b are vertical seal rolls, and the vertical seal rolls 51 a and 51 b include a pair of left and right parallel shafts 52, and a seal ring 53 with a built-in heater provided at both ends thereof. Yes. The seal rings 53 of the vertical seal rolls 51 a and 51 b are opposed to each other on the outer peripheral surface thereof, and both ends of the two films 54 that are overlapped are sandwiched between the opposed seal rings 53.
[0004]
A pair of left and right parallel horizontal seal rolls (seal rolls) 55a and 55b are disposed below the vertical seal rolls 51a and 51b. Each of the horizontal seal rolls 55a and 55b includes a plurality of (three in the figure) built-in heaters that protrude at equal intervals along the circumferential direction of the roll main body 56 from the outer peripheral surface of the roll main body 56 and the roll main body 56. And a seal bar 57. These seal bars 57 extend in the axial direction of the roll body 56, and when the horizontal seal rolls 55a and 55b are rotated as will be described later, the film 54 is intermittently provided between the opposing seal bars 57. Sandwiched between.
[0005]
The pair of vertical seal rolls 51a and 51b and the horizontal seal rolls 55a and 55b are reversely synchronized with the downward movement of the film 54 inserted between the seal rolls 51a, 51b, 55a and 55b from above. Is driven to rotate. That is, the vertical seal roll 51a and the horizontal seal roll 55a are driven so as to rotate in the right direction of the figure, and the vertical seal roll 51b and the horizontal seal roll 55b are driven so as to rotate in the left direction of the figure.
[0006]
Reference numeral 58 denotes a nozzle for supplying contents, and the nozzle 58 is inserted between the two films 54 from above, and the tip of the nozzle 58 corresponds to the installation position of the vertical seal rolls 51a and 51b and the installation position of the horizontal seal rolls 55a and 55b. It is open in the middle.
[0007]
The film 54 is processed into a bag body 61 filled with contents by the bag making machine 50. The process is shown below. The two films 54 inserted between the vertical seal rolls 51a and 51b from above are overlapped with each other between the vertical seal rolls 51a and 51b, and both ends of the film 54 are opposed to the vertical seal rolls 51a and 51b. The seal ring 53 is sandwiched between the seal rings 53. As a result, a longitudinal seal portion 54 </ b> A is formed at both ends of the film 54 by sealing (vertical sealing) the two films 54 along the longitudinal direction by heat applied from the seal ring 53.
[0008]
The film 54 after the vertical sealing is inserted between the horizontal sealing rolls 55a and 55b and passes between the horizontal sealing rolls 55a and 55b through the process shown in FIG. 5, and as a result, the film 54 crosses the film 54. A horizontal seal portion 54B is formed.
[0009]
FIG. 5 illustrates a change in the positional relationship of the seal bar 57 accompanying the formation of the lateral seal portion 54B. In the figure, an arrow C indicates the rotational direction of the lateral seal rolls 55a and 55b. The pair of seal bars 57 are close to each other at a position indicated by 57 (α) in FIG. And after passing the position shown by 57 ((beta)), it reaches the position shown by 57 ((gamma)), and is mutually spaced apart after that. The film 54 is sandwiched between the opposing seal bars 57 from the position indicated by reference numeral 57 (α) (at the start of sealing) to the position indicated by reference numeral 57 (γ) (at the end of sealing). As a result, the opposing films 54 are heat-sealed to form a lateral seal portion 54B.
[0010]
In addition, with the formation of the horizontal seal portion 54B, the contents are supplied from the nozzle 58 between the two films 54 positioned above the horizontal seal rolls 55a and 55b (position indicated by reference numeral A in FIG. 4). . The contents are filled in a space formed between the two films 54, the side and the bottom of which are sealed by the vertical seal portion 54A and the horizontal seal portion 54B, respectively.
[0011]
Then, the horizontal seal rolls 55a and 55b are each rotated by a predetermined angle from the position indicated by symbol A (1/3 rotation in the figure), whereby the film 54 moves downward and the film 54 filled with the contents. Is sandwiched between adjacent seal bars 57. As a result, the horizontal seal portion 54B is similarly formed at the position sandwiched between the seal bars 57, and the contents are sealed in the space surrounded by the seal portions 54A and 54B, as indicated by symbol B in FIG. Is done. Furthermore, the bag body 61 is completed by cutting the center of the horizontal seal portion 54B with a cutter (not shown).
[0012]
[Problems to be solved by the invention]
In the bag body 61 formed by the conventional bag making machine 50 described above, the seal strength of the portion formed at the start of sealing (the position indicated by reference numeral 57 (α) in FIG. 5) in the lateral seal portion 54B is as follows. In some cases, this tends to be insufficient, and seal peeling tends to occur. The cause is that the film 54 is unheated at the start of sealing, so the temperature difference between the film 54 and the seal bar 57 is large, and as a result, the amount of heat applied from the seal bar 57 to the lateral seal portion 54B is insufficient. This is thought to be because the melting of the resin in the lateral seal portion 54B becomes insufficient.
[0013]
On the other hand, in the portion formed at the end of sealing (the position indicated by reference numeral 57 (γ) in FIG. 5) in the horizontal seal portion 54B, the molten resin is squeezed by the seal bar 57 and pushed upward. It is often observed that a so-called “poly pool” occurs between the films 54. In addition, the poly pool may be formed unevenly depending on the mechanical accuracy of the horizontal seal rolls 55a and 55b. FIG. 6 is a view showing a state in which a poly pool 70 biased in the lateral seal portion 54B is generated.
[0014]
In the vicinity of the poly reservoir 70, the melted resin is pushed out toward the poly reservoir 70, so that a thin portion (edge) 71 is generated in the lateral seal portion 54B. At the edge 71, the mechanical strength of the lateral seal portion 54B is reduced, and stress is likely to be concentrated compared to other portions, which may cause defects such as film breakage. When a biased poly pool 70 is generated as shown, defects due to the formation of the edge 71 tend to occur. The cause of the occurrence of the poly pool 70 and the edge 71 is that the horizontal seal portion 54B is already heated by the seal bar 57 at the end of sealing and further heated by the seal bar 57. This is considered to be because the amount of heating with respect to is excessive, and as a result, the excessively melted resin is extruded excessively.
[0015]
  The present invention has been made to solve the above-described problem, and is caused by the occurrence of seal peeling at the portion formed at the start of sealing and the occurrence of poly pools at the portion formed at the end of sealing in the lateral seal portion. A heat seal method and heat seal device capable of performing a homogeneous seal from the start of the seal to the end of the seal without occurrence of defects, etc., and a sufficient seal strength by applying a uniform seal from the start of the seal to the end of the seal Bag withManufacturing methodIt is an issue to provide.
[0016]
[Means for Solving the Problems]
  The present invention reverses a pair of two seal rolls so that a pair of seal bars protruding from the side surfaces of the individual seal rolls intermittently sandwich the stacked heat-sealable films. In the sealing method of rotating in the direction and sealing the film sandwiched between these seal bars by the heat applied to the film through the seal bar,By gradually increasing the rotational speed of the pair of seal rolls so that it becomes minimum at the start of sealing and maximum at the end of sealing,It is characterized in that the amount of heat applied to the film through the seal bar at the time of sealing is gradually decreased so as to be maximized at the start of the seal and minimized at the end of the seal.
[0017]
  The present invention also includes a pair of seal rolls, a pair of seal bars projecting from the side surfaces of the individual seal rolls, and an overlapped film having heat-sealing properties that are intermittently sandwiched between the seal bars. And a driving device that rotates the pair of seal rolls in opposite directions, and seals the film sandwiched between the seal bars by the heat applied to the film through the seal bar.By gradually increasing the rotational speed of the pair of seal rolls so that it becomes minimum at the start of sealing and maximum at the end of sealing,When sealing, the amount of heat applied to the film via the seal bar is gradually decreased so that it becomes maximum at the start of sealing and minimum at the end of sealing.Whenis doing.
[0018]
  In this case, for example,The moving speed of the film is changed in synchronization with the change in the rotation speed of the seal roll..
[0019]
Alternatively, the amount of heat applied to the film via the seal bar is gradually reduced by gradually increasing the gap between the seal bars that sandwich the film so that the gap is minimized at the start of the seal and maximized at the end of the seal. .
[0020]
As a specific method for gradually increasing the distance between the seal bars that sandwich the film, for example, the distance between the rotation centers of the pair of seal rolls may be gradually increased so that the distance is minimized at the start of sealing and maximized at the end of sealing. Alternatively, there may be mentioned a method in which the surface of each seal bar is gradually retracted toward the rotation center side of the seal roll along the rotation direction of the seal roll.
[0021]
  Furthermore, the present invention relates to a bag obtained by sealing a plurality of superposed films having heat-fusibility.Manufacturing methodIn particular, the horizontal sealing portion by the sealing method described aboveTheFormationDoIt also features that.
  In this case, for example, the movement speed of the film is changed in synchronization with the change in the rotation speed of the seal roll, and the rotation speed of other members that should correspond to the movement speed of the film is also the rotation of the seal roll. Change in sync with changes in speed.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, about the member which has the structure similar to the member shown to the said FIG.4 and FIG.5, the code | symbol same as the member shown in FIG.4 and FIG.5 is attached | subjected and the description is abbreviate | omitted.
[0023]
An embodiment of the present invention will be described with reference to FIG. In the present embodiment, the rotational speed of the horizontal seal rolls 55a and 55b is changed as shown in FIG. 1 by using the filling bag making machine 50 shown in FIGS. In FIG. 1, α and γ indicate the time when the seal bar 57 takes the positions 57 (α) and 57 (γ) in FIG. 5, that is, when the horizontal seal starts and when the seal ends. .
[0024]
As shown in FIG. 1, in this embodiment, the rotational speed of the horizontal seal rolls 55a and 55b is set so as to be gradually accelerated from the initial speed at the start of the seal and become the fastest at the end of the seal. After the end of sealing, the rotational speed of the lateral seal rolls 55a and 55b is returned to the initial speed before the lateral sealing by the next pair of seal bars 57 is started. Further, in the case of the filling bag making machine 50 shown in FIGS. 4 and 5, since there are three seal bars provided on one horizontal seal roll 55a, 55b, the horizontal seal roll 55a, 55b repeats the above acceleration and deceleration three times per rotation.
[0025]
Also in this embodiment, it is needless to say that the moving speed of the film 54 needs to be synchronized with the rotational speed of the horizontal seal rolls 55a and 55b, as in the prior art. Accordingly, when the present embodiment is implemented, the moving speed of the film 54 and the rotational speeds of the vertical seal rolls 51a and 51b are also changed in synchronization with the rotational speed changes of the horizontal seal rolls 55a and 55b. In addition, when the filling bag making machine 50 includes other members that should correspond to the moving speed of the film, such as a film feeding roll, a pulling roll, and a cooling roll, the rotational speed of these members is also naturally determined. It is changed in synchronism with the rotational speed change of the horizontal seal rolls 55a and 55b.
[0026]
In the present embodiment, there is no particular limitation on the driving means of the horizontal seal rolls 55a and 55b, but a servo motor such as a stepping motor can be used particularly suitably. When a stepping motor is used, the rotational speed of the horizontal seal rolls 55a and 55b changes in a step shape when viewed microscopically, but it is desirable to change it gently when viewed macroscopically. In this embodiment, the rotational speed of the horizontal seal rolls 55a and 55b is linearly changed. However, the rate of change in the rotational speed of the horizontal seal rolls 55a and 55b is intended for more uniform heating and uniform heat sealing. May be changed as appropriate.
[0027]
According to the present embodiment, since the rotational speed of the horizontal seal rolls 55a and 55b at the start of sealing, that is, at the start of clamping of the film 54 by the opposing seal bar 57 is slow, the unheated film 54 is sufficiently heated, Seals with the required strength can be applied. Therefore, according to the present embodiment, it is possible to prevent the peeling of the seal at the portion formed at the start of sealing in the horizontal seal portion 54B.
[0028]
In addition, since the rotational speed of the horizontal seal rolls 55a and 55b becomes faster as the seal ends, the amount of heat applied from the seal bar 57 to the film 54 with the contact with the seal bar 57 decreases as the seal ends. Therefore, the amount of heating that is further heated via the seal bar 57 can be reduced in the horizontal seal portion 54B that has already been sufficiently heated by the seal bar 57. As a result, the amount of heating for the seal portion 54B is not excessive. Generation of the poly pool 70 and the edge 71 is minimized.
[0029]
Therefore, according to the present embodiment, when forming the horizontal seal portion 54B, there is no occurrence of failure due to seal peeling at the start of sealing or occurrence of a poly pool at the end of sealing, and it is uniform from the start of sealing to the end of sealing. Can be performed laterally.
[0030]
Another embodiment of the present invention will be described with reference to FIG. In this embodiment, in the filling bag making machine 50 shown in FIGS. 4 and 5, the horizontal seal rolls (seal rolls) 1a and 1b shown in FIG. 2 are used instead of the horizontal seal rolls 55a and 55b. 2A and 2B are front views showing the horizontal seal rolls 1a and 1b. FIG. 2A shows a state at the start of sealing, FIG. 2B shows a state during sealing, and FIG. 2C shows a state at the end of sealing.
[0031]
The horizontal seal rolls 1a and 1b according to the present embodiment protrude from the pair of roll main bodies 2 and the outer peripheral surface of the roll main body 2 at equal intervals along the circumferential direction, like the horizontal seal rolls 55a and 55b described above. It is comprised from the three seal bars 3 extended in the axial direction of the roll main body 2. As shown in FIG. The rotation center P1 of the horizontal seal roll 1a is displaceable in a direction approaching and separating from the pair of horizontal seal rolls 1b (the horizontal direction in the figure), and the pair of horizontal seal rolls 1b by an urging means (not shown). (Left side of the figure).
[0032]
Reference numeral 9 denotes a cam fixed to the end face of the horizontal seal roll 1a so as to be coaxial with the horizontal seal roll 1a, and reference numeral 10 denotes a cam plate that contacts the outer peripheral surface of the cam 9 from the side of the horizontal seal roll 1b. The cam 9 rotates while contacting the outer periphery of the cam plate 10, and the horizontal seal roll 1 a is displaced in a direction approaching and separating from the paired horizontal seal roll 1 b according to the distance from the rotation center P 1 to the outer peripheral surface. It is supposed to let you. Specifically, as indicated by reference numeral 9a in the figure, the outer peripheral surface of the cam 9 is directed toward the rear side in the rotational direction of the horizontal seal roll 1a at a position corresponding to the radially inner side of each seal bar 3. , Projecting gradually outward in the radial direction. On the other hand, the structure of the horizontal seal roll 1b is the same as that of the horizontal seal roll 55a, and its rotation center P2 is held at a fixed position.
[0033]
Then, by sandwiching a plurality of superimposed films 54 between the opposing seal bars 3 as the horizontal seal rolls 1a and 1b rotate, the films 54 are sealed by the heat applied from the seal bars 3, The opposing films 54 are heat-sealed to form a lateral seal portion 54B.
[0034]
In this case, as shown in FIG. 2A, at the start of sealing, the cam 9 is in contact with the cam plate 10 at a position where the distance d from the rotation center P1 to the outer peripheral surface is minimum. The seal roll 1a is displaced toward the paired horizontal seal roll 1b, and the distance between the rotation centers P1 and P2 is minimized. Accordingly, the distance between the seal bars 3 facing each other with the film 54 interposed therebetween is also minimized, and the film 54 is sufficiently heated from both sides by the seal bars 3 that are close to each other and is relatively strongly pressed by the seal bar 3. As a result, a necessary seal strength is imparted to the portion formed at the start of sealing in the lateral seal portion 54B, and seal peeling or the like at this portion is prevented.
[0035]
In addition, as shown in FIG. 2B, during the sealing, the distance d described above is slightly longer than that at the start of sealing, so that the horizontal seal roll 1a is slightly separated from the paired horizontal seal roll 1b side. Displacement causes the rotation centers P1 and P2 to be separated from the start of sealing. Accordingly, the interval between the seal bars 3 facing each other with the film 54 interposed therebetween is larger than that at the start of sealing, and the amount of heat applied to the film 54 by the seal bar 3 is lower than that at the start of sealing. However, since the film 54 is heated in advance at the start of sealing, even if the amount of heat applied decreases, the overall amount of heat applied to the film 54 does not become excessive or insufficient. Further, the pressurization of the film 54 by the seal bar 3 is slightly reduced and becomes appropriate. Therefore, an appropriate seal strength is also given to the portion formed in the middle of the seal in the horizontal seal portion 54B.
[0036]
Further, as shown in FIG. 2 (c), at the end of sealing, the cam 9 is in contact with the cam plate 10 at a position where the distance d from the rotation center P1 to the outer peripheral surface is the maximum, so that the horizontal seal The roll 1a is displaced so as to be farthest from the pair of horizontal seal rolls 1b, and the distance between the rotation centers P1 and P2 is maximized. Accordingly, the distance between the seal bars 3 facing each other with the film 54 interposed therebetween is maximized, and the amount of heat applied to the film 54 by the seal bar 3 is minimized. However, since the film 54 has already been sufficiently heated by the amount of heat applied from the seal bar 3 from the start of sealing to the end of sealing, it is applied to the film 54 even if the amount of applied heat decreases. There is no overall excess or deficiency of heat. Further, since the pressurization of the film 54 by the seal bar 3 is minimized, the amount of resin squeezed and pushed out by the seal bar 3 can be minimized. Therefore, an appropriate seal strength is also given to the portion formed at the end of the seal in the lateral seal portion 54B, and in particular, unnecessary poly pools and edges are generated due to excessive extrusion of the molten resin. Is prevented.
[0037]
Therefore, also in the present embodiment, when forming the horizontal seal portion 54B, there is no occurrence of failure due to seal peeling at the start of sealing or occurrence of a poly pool at the end of sealing, and it is uniform from the start of sealing to the end of sealing. Lateral sealing can be performed.
[0038]
In the present embodiment, the cam is used as the means for displacing the rotation center P1 of the horizontal seal roll 1a. However, the horizontal seal is used by using a dedicated drive means independent of the drive means for rotating the horizontal seal roll 1a. The rotation center P1 of the roll 1a may be displaced. Further, the rotational center P2 of the horizontal seal row 1b may be displaceable similarly to the horizontal seal roll 1a.
[0039]
Still another embodiment of the present invention will be described with reference to FIG. In this embodiment, in the filling bag making machine 50 shown in FIGS. 4 and 5, horizontal seal rolls (seal rolls) 1c and 1d shown in FIG. 3 are used instead of the horizontal seal rolls 55a and 55b. FIGS. 3A and 3B are front views showing the horizontal seal rolls 1c and 1d, in which FIG. 3A shows a state at the start of sealing, FIG. 3B shows a state during sealing, and FIG. 3C shows a state at the end of sealing.
[0040]
The horizontal seal rolls 1c and 1d of the present embodiment project at regular intervals along the circumferential direction from the pair of roll main bodies 2a and the outer peripheral surface of the roll main body 2a, like the horizontal seal rolls 55a and 55b described above. It is comprised from the three seal bars 3a extended in the axial direction of the roll main body 2a. Further, the surface 31 of each seal bar 3a is an inclined surface that gradually recedes toward the rotation center Q side of the horizontal seal roll along the rotation direction of the horizontal seal rolls 1c and 1d.
[0041]
Then, by sandwiching a plurality of superimposed films 54 between the opposing seal bars 3a as the horizontal seal rolls 1c and 1d rotate, the films 54 are sealed by the heat applied from the seal bars 3a. The opposing films 54 are heat-sealed to form a lateral seal portion 54B.
[0042]
In this case, as shown in FIG. 3A, since the distance from the surface 31 of each individual seal bar 3a to the rotation center Q is maximized at the start of the seal, the seal bar 3a opposed to each other with the film 54 interposed therebetween. The interval is minimized. Accordingly, the film 54 is sufficiently heated from both sides by the seal bars 3a that are close to each other, and is relatively strongly pressed by the seal bar 3a. As a result, a necessary seal strength is imparted to the portion formed at the start of sealing in the lateral seal portion 54B, and seal peeling or the like at this portion is prevented.
[0043]
Further, the surface 31 of the seal bar 3a is an inclined surface that gradually recedes toward the rotation center Q side of the horizontal seal roll along the rotational direction of the horizontal seal rolls 1c and 1d, and is shown in FIG. Thus, in the middle of sealing, the distance between the surfaces 31 facing each other with the film 54 interposed therebetween is larger than that at the start of sealing, and the amount of heat applied to the film 54 by the seal bar 3a is lower than at the beginning of sealing. However, since the film 54 is heated in advance at the start of sealing, even if the amount of heat applied decreases, the overall amount of heat applied to the film 54 does not become excessive or insufficient. Further, the pressurization of the film 54 by the seal bar 3a is somewhat reduced and becomes appropriate. Therefore, an appropriate seal strength is also given to the portion formed in the middle of the seal in the horizontal seal portion 54B.
[0044]
As shown in FIG. 3C, at the end of sealing, the distance between the surfaces 31 facing each other across the film 54 is maximized, and the amount of heat applied to the film 54 by the seal bar 3a is minimized. However, since the film 54 has already been sufficiently heated by the amount of heat applied from the seal bar 3a from the start of sealing to the end of sealing, it is applied to the film 54 even if the amount of heat applied is reduced. There is no overall excess or deficiency of heat. Further, since the pressure of the film 54 by the seal bar 3a is minimized, the amount of resin that is squeezed out and pushed out by the seal bar 3a can be minimized. Therefore, an appropriate seal strength is also given to the portion formed at the end of the seal in the lateral seal portion 54B, and in particular, unnecessary poly pools and edges are formed by excessively extruding the molten resin. Is prevented.
[0045]
Therefore, also in the present embodiment, when forming the horizontal seal portion 54B, there is no occurrence of failure due to seal peeling at the start of sealing or occurrence of a poly pool at the end of sealing, and it is uniform from the start of sealing to the end of sealing. Lateral sealing can be performed.
[0046]
In this embodiment, the center of rotation of the horizontal seal rolls 1c and 1d is fixed at a fixed position. However, as shown in FIG. 2, the distance between the seal bars 3a can be adjusted using a cam or the like. It doesn't matter. That is, you may adjust the space | interval of the seal bar 3a from both the shape of the seal bar 3a and the position adjustment of the rotation center. Further, the horizontal seal roll 1d may have the same structure as the horizontal seal rolls 55a and 55b in FIGS. 4 and 5, and the interval between the seal bars 3a may be adjusted only by the horizontal seal roll 1c.
[0047]
Further, the rotational speed of the horizontal seal rolls 1a to 1d of the embodiment shown in FIGS. 2 and 3 is changed as shown in FIG. 1, and applied to the film 54 from both the interval and the speed of the seal bars 3 and 3a. The amount of heat generated may be controlled.
[0048]
Moreover, the horizontal seal rolls 1a to 1d of the above-described embodiments are not only the horizontal seal rolls of the bag making machine for the bag body in which the vertical seals are provided at two places as shown in FIG. It can also be applied to horizontal seal rolls for other forms of bags, such as pillow bags and gusset bags, and the film 54 is a single film folded or a plurality of films overlaid. Things can be used. In addition, there is no limitation in particular in the specific manufacturing method of the roll main bodies 2 and 2a and the seal bars 3, 3a and 57, Even if comprised integrally, what manufactured separately may be fixed by welding etc. Further, the number of the seal bars 3, 3a, 57 is not particularly limited, and it is sufficient that at least one seal bar 3, 3a, 57 is provided in each of the horizontal seal rolls 1a to 1d. In each of the above-described embodiments, the heat seal that forms the horizontal seal portion 54B by heating the film 54 with the heater built in the seal bars 3, 3a, and 57 of the horizontal seal rolls 1a to 1d, 55a, and 55b. Although employed, the heating method of the film 54 is not limited, and the film 54 is heated by applying ultrasonic vibration to the film 54 through the seal bars 3, 3a, 57 to form the horizontal seal portion 54B. An ultrasonic seal or the like can also be employed as appropriate.
[0049]
【The invention's effect】
As described above in detail, according to the heat sealing method and the heat sealing apparatus of the present invention, the rotation speed of the seal roll and the seal bar Since the interval is adjusted and the overall amount of heat applied to the seal bar is controlled, the amount of heat applied to the film is uniform throughout the seal portion. As a result, according to the heat sealing method and the heat sealing apparatus of the present invention, there is no occurrence of failure due to seal peeling at the start of sealing or occurrence of poly pool at the end of sealing, from the start of sealing to the end of sealing, A bag body having a seal portion that is homogeneous and has sufficient seal strength can be obtained.
[Brief description of the drawings]
FIG. 1 is a graph showing a change in rotational speed of a seal roll according to an embodiment of the present invention.
FIGS. 2A and 2B are front views showing a seal roll according to another embodiment of the present invention, wherein FIG. 2A shows a state at the start of sealing, FIG. 2B shows a state during sealing, and FIG. 2C shows a state at the end of sealing; Is.
FIGS. 3A and 3B are front views showing a seal roll according to another embodiment of the present invention, wherein FIG. 3A shows a state at the start of sealing, FIG. 3B shows a state during sealing, and FIG. 3C shows a state at the end of sealing; Is.
FIG. 4 is a perspective view showing an example of the structure of a filling bag making machine to which the present invention can be applied.
FIG. 5 is a diagram for explaining a change in the positional relationship of the seal bar accompanying the formation of the lateral seal portion in the filling bag making machine shown in FIG. 4;
FIG. 6 is a partial cross-sectional view of a film showing a state of occurrence of a poly pool in the vicinity of a lateral seal portion.
[Explanation of symbols]
1a, 1b, 1c, 1d, 55a, 55b Horizontal seal roll (seal roll)
2,2a, 56 Roll body
3, 3a, 57 Seal bar
9 cams
10 Cam plate
54 films
61 Bag
P1, P2, Q Seal roll rotation center

Claims (6)

二本一対のシールロールを、個々のシールロールの側面から突出する一対以上のシールバーが、重ね合わせられた熱融着性を有するフィルムを間欠的に挟持するように、互いに逆方向に回転させ、前記シールバー間に挟持された前記フィルムを、前記シールバーを介して前記フィルムに印加された熱によりシールするシール方法において、前記一対のシールロールの回転速度を、シール開始時に最小となり、シール終了時に最大となるよう、漸次増加させることにより、前記シールに際し前記シールバーを介して前記フィルムに印加される熱量を、シール開始時に最大となり、シール終了時に最小となるよう、漸次減少させることを特徴とするシール方法。Two pairs of seal rolls are rotated in opposite directions so that the pair of seal bars protruding from the side surfaces of the individual seal rolls intermittently sandwich the laminated heat-sealable film. In the sealing method of sealing the film sandwiched between the seal bars by heat applied to the film through the seal bar, the rotational speed of the pair of seal rolls is minimized at the start of sealing, By gradually increasing so that it becomes maximum at the end, the amount of heat applied to the film via the seal bar at the time of sealing is gradually decreased so that it becomes maximum at the start of sealing and minimum at the end of sealing. A characteristic sealing method. 前記シールロールの回転速度の変化に同期して、前記フィルムの移動速度を変化させることを特徴とする請求項１に記載のシール方法。The sealing method according to claim 1, wherein the moving speed of the film is changed in synchronization with a change in the rotation speed of the sealing roll. 二本一対のシールロールと、個々のシールロールの側面から突出する一対以上のシールバーと、重ね合わせられた熱融着性を有するフィルムが前記シールバーにより間欠的に挟持されるように、前記一対のシールロールを互いに逆方向に回転させる駆動手段とを備え、前記シールバー間に挟持された前記フィルムを、前記シールバーを介して前記フィルムに印加された熱によりシールするシール装置において、前記一対のシールロールの回転速度を、シール開始時に最小となり、シール終了時に最大となるよう、漸次増加させることにより、前記シールに際し前記シールバーを介して前記フィルムに印加される熱量を、シール開始時に最大となり、シール終了時に最小となるよう、漸次減少させることを特徴とするシール装置。Two pairs of seal rolls, a pair of one or more seal bars protruding from the side surfaces of the individual seal rolls, and an overlapped film having heat fusion properties are intermittently sandwiched by the seal bars, and drive means for rotating the pair of seal rolls in opposite directions, the film held between the seal bars, the sealing device to seal the applied heat to the film through the sealing bar, the By gradually increasing the rotational speed of the pair of seal rolls so that the rotational speed is minimized at the start of sealing and maximized at the end of sealing, the amount of heat applied to the film through the seal bar at the time of sealing is reduced at the start of sealing. A sealing device characterized by being gradually reduced so as to become maximum and minimum at the end of sealing. 前記シールロールの回転速度の変化に同期して、前記フィルムの移動速度を変化させることを特徴とする請求項３に記載のシール装置。The sealing apparatus according to claim 3, wherein a moving speed of the film is changed in synchronization with a change in a rotation speed of the seal roll. 重ね合わせられた複数枚の熱融着性を有するフィルムをシールして得られる袋体の製造方法において、請求項１に記載のシール方法によって横シール部を形成することを特徴とする袋体の製造方法。In the manufacturing method of the bag body obtained by sealing the several film | membrane which has the heat bonding property on which it piled up, a horizontal seal part is formed with the sealing method of Claim 1 , The bag body characterized by the above-mentioned . Manufacturing method . 前記シールロールの回転速度の変化に同期して、前記フィルムの移動速度を変化させるとともに、前記フィルムの移動速度に対応すべきその他の部材の回転速度も、前記シールロールの回転速度の変化に同期して変化させることを特徴とする請求項５に記載の袋体の製造方法。The movement speed of the film is changed in synchronization with the change in the rotation speed of the seal roll, and the rotation speed of other members that should correspond to the movement speed of the film is also synchronized with the change in the rotation speed of the seal roll. The bag manufacturing method according to claim 5, wherein the bag body is changed.
JP2000174382A 2000-06-09 2000-06-09 Sealing method, sealing device, and bag manufacturing method Expired - Fee Related JP4514903B2 (en)

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JPH05237939A (en) * 1992-02-26 1993-09-17 Taisei Ramick Kk Heat seal roll
JPH05329932A (en) * 1992-05-27 1993-12-14 Taisei Ramick Kk Heat-sealing roll
JPH09295624A (en) * 1996-05-02 1997-11-18 Omori Mach Co Ltd End seal device
JP2000247310A (en) * 1999-03-02 2000-09-12 Taisei Ramikku Kk Heat-sealing roll
JP2003026103A (en) * 2001-07-19 2003-01-29 Nippon Seiki Co Ltd Filling and packaging machine and method for its operation

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