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JPS5947438B2 - 高周波加熱コイル - Google Patents
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JPS5947438B2 - 高周波加熱コイル - Google Patents

高周波加熱コイル

Info

Publication number
JPS5947438B2
JPS5947438B2 JP50026739A JP2673975A JPS5947438B2 JP S5947438 B2 JPS5947438 B2 JP S5947438B2 JP 50026739 A JP50026739 A JP 50026739A JP 2673975 A JP2673975 A JP 2673975A JP S5947438 B2 JPS5947438 B2 JP S5947438B2
Authority
JP
Japan
Prior art keywords
heating coil
heating
coil
frequency heating
sheet
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.)
Expired
Application number
JP50026739A
Other languages
English (en)
Other versions
JPS51101240A (ja
Inventor
一久 石橋
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP50026739A priority Critical patent/JPS5947438B2/ja
Publication of JPS51101240A publication Critical patent/JPS51101240A/ja
Publication of JPS5947438B2 publication Critical patent/JPS5947438B2/ja
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—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
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3668—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • 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
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • B29C66/72321—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
    • B29C66/73—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
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making 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
    • 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
    • B29C66/91921—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 in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • 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
    • B29C66/91951—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 in explicit relation to time, e.g. temperature-time 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/944—Measuring or controlling the joining process by measuring or controlling the time by controlling or regulating the 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
    • B29C66/96—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
    • 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
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged 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
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5342—Joining single elements to open ends of tubular or hollow articles or to the ends of bars a substantially flat extra element being placed between and clamped by the joined single elements and the end of said tubular or hollow articles
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • 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
    • B29C66/91213—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 and measuring the electrical resistance of a resistive element belonging to said welding jaws, said element being, e.g. a thermistor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/02—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Package Closures (AREA)
  • General Induction Heating (AREA)

Description

【発明の詳細な説明】 本発明は高周波加熱コイル装置、特に被加熱体と近接す
る高周波加熱コイルを有する高周波加熱コイル装置の改
良に関するものである。
磁界内に置かれた良導体あるいは磁性体が電磁誘導作用
により加熱される誘導加熱現象は周知であり、この加熱
現象を用いたいくつかの高周波誘導加熱装置が実用化さ
れている。
高周波誘導加熱装置の好適な使用例として調理済み食品
ｑ充填された保存容器を密封する加熱シール工程が知ら
れている。通常の保存容器はアルミニウム等の金属箔を
両面から樹脂膜で積層した三重構造のシートで形成され
、このシートを袋状あるいは他の容器形状にした後に一
部を残して接合部を加熱シールする。
こうして製作された保存容器には調理済み食品が充填さ
れ、直ちに充填開口部が加熱シールされる。従来の加熱
シール手段として、加熱体をシール部に押圧して熱伝導
により接合部の樹脂膜を溶融接合するものが知られてい
るが、金属箔の外側の樹脂膜の溶融を防ぐために、押圧
する加熱体の温度をある程度以上にできないので、接合
部である内側の樹脂膜が溶融するのに長時間かかる。特
に、食品の風味を損ねないためと、加熱殺菌作業の能率
を上げるために、高温短時間殺菌が行なわれる場合には
、内側の樹脂膜の溶融温度は高温に耐えねばならず、ま
た外側の樹脂膜を溶融温度の高いものとすることは価格
の点で不利であるので、内側と外側との溶融温度の差は
少なくなり、内側のものを溶融するのに、かなり長い時
間がかかる。また保存容器が破損しないように内側の樹
脂膜として強靭なナイロンを使用することが好ましいが
、ナイロンはその特性上水分を吸収しやすいので、内側
の樹脂膜を溶融接合する際、ナイロンに吸収されている
水分が蒸発し、内側の樹脂膜は発泡するので、押圧した
ままの状態で接合部の温度を蒸発した水分が再びナイロ
ンに吸収される温度まで下げなければならない。この様
な加熱シール工程に高周波誘導加熱を使用すれば、シー
トの金属箔が直接加熱され、内側の樹脂膜が効果的に溶
融接合され、その作業効率は極端に向上するし、押圧状
態で加熱コイルヘの高周波電力の供給を停止すれば、加
熱された゜シートの熱は温度の低い加熱コイルヘと移り
、前述したような発泡も抑えることができる。
加熱シールする際、シートヘ加熱コイルを押付けるので
、加熱コイルと被加熱物である金属箔とは、極めて接近
し、加熱コイルと金属箔との相互誘導係数は大きく、加
熱コイルの力率が高い状態で使用される。
このような力率の高い負荷へ電力を供給するために、最
適の高周波電源は電力用トランジスタあるいはサイリス
タを用いたスイツチング方式のインバータである。すな
わち、この方式の高周波電源は、前述した真空管発振器
式の様な大きなタンク回路を必要としないで、小型で低
廉かつ高効率が得られる。この高周波誘導加熱用の電源
回路としては小型低廉でかつ加熱効率の高い電力用トラ
ンジスタを利用した電源回路が好ましい。
この様なトランジスタ方式の電源回路を用いて電力を供
給する場合、取り出し得る最大電力は負荷の力率が高け
れば高いほど大きくなる。即ら負荷に供給される電力は
駆動トランジスタの破壊限界で規制されるコレクタ電圧
と電流との積に比例するが、負荷の力率が低い場合には
負荷のインダクタンスに蓄えられるエネルギが増加し、
この蓄積エネルギは駆動トランジスタのスイツチング動
作の毎に電源とインダクタンス間で往復するのみで有効
電力とすることができない。従つてトランジスタ電源回
路を用いた高周波誘導加熱装置には高力率の加熱コイル
が要求される。
加熱コイルの力率を高めるためには、加熱コイルと被加
熱体との相互誘導係数をできるだけ１に近ずけることが
好ましい。周知の様に加熱コイルと被加熱体との間隙が
増加すると加熱コイルの力率は急速に低下する。従つて
加熱コイルと被加熱体とは相互に密着した状態で誘導加
熱が行なわれることが望ましい。この様な接触型の誘導
加熱においては、被加熱体から加熱コイルへ向つて大き
な熱伝導作用が生起し、シール部の温度が加熱コイルと
接触しないシール部の周縁部の温度より低下するのでシ
ール部の溶融以前に周縁部が溶融されてしまい実質的に
シールが不可能であつた。しかし、従来の高周波加熱コ
イルにあつては、加熱コイル装置自体が保存容器の熱を
奪つてしまい、効率の良い誘導加熱ができないものであ
つた。本発明はこのような従来の課題に鑑み為されたも
のであり、接触型の高周波加熱装置に好適な熱効率の良
い加熱コイルを提供することを目的とする。以下図面に
基づいて本発明に係る加熱コイルを詳細に説明する。
第１図には通常の加熱コイルの基本的な偏平渦巻きコイ
ル形状が示されている。
この加熱コイル１０は被加熱体に絶縁状態で押し付けら
れ、コイル形状に対応した部位が加熱される。第２図に
は袋状の保存容器を製作する途中段階が示され、三重構
造の積層シート１１が２枚重ねられ、その上を加熱コイ
ル１０が矢印の様に移動することにより斜線で示される
接合部１２が加熱シールされる。そして接合部１２を鎖
線に示す様に切断すれば三辺が接合された装状の保存容
器を得ることができる。この製作時に、第１図に示した
偏平渦巻きコイル１０は第２図の若干誇張した図から明
きらかな様に破線の部分まで加熱シールしてしまう点で
使用することができない。このために実際の使用上は恐
らく加熱コイル１０の一方の辺１０Ａを無効辺とするべ
く被加熱体である積層シート１１から浮離されることが
必要であろう。第３図には第２図の説明の様にして製作
された保存容器に調理済み食品を充填した後に、その開
口部１３を加熱コイル１０により加熱シールする状態が
示されている。この場合でも加熱コイル１０の無効辺１
０Ａは被加熱体と近接しないことが容易に理解される。
こうした無効辺を有する加熱コイルは無効辺が被加熱体
と電磁結合しないために相互誘導係数は低下し、高力率
の加熱コイルを得ることは得策でない。第１図において
、加熱コイル１０の無効辺１０Ａを加熱辺１０Ｂに近接
することにより１本の狭い帯状の加熱シールが達成され
るかにみえる。
しかし、より現実的にはこの結果相互誘導係数自体が低
下してしまうのでこの考えは否定される。第４図には保
存容器の開口部を気密シールする従来の改良された加熱
コイルが示され、偏平渦巻コイル１０にフエライトの磁
芯１４を固定したものである。この従来例では加熱コイ
ル１０から生じた磁束のほとんどは矢印Ｐで示される様
に磁芯１４中を通り、相互誘導係数の増大に寄与する。
しかし、この場合であつても無効辺１０Ａによる被加熱
体と鎖交しない磁束Ｑの存在により加熱コイル全体の相
互誘導係数は抑制されてしまう。第５図には本発明に係
る高周波加熱コイルの概略構成図が示され、無効辺１０
Ａとのみ鎖交する洩れ磁束Ｑを減少するために短絡コイ
ル１５が設けられている。短絡コイル１５はその一方の
辺部が加熱コイル１０の無効辺ＩＯＡに接近して配置さ
れ、磁芯１４の磁気回路を囲む短絡電流通路を形成する
。短絡コイル１５が図示の様に設けられると、洩れ磁束
Ｑが短絡コイル１５と鎖交するので、短絡コイル１５に
はこの洩れ磁束Ｑを打ち消す方向の電流が図示の様に流
れる。この結果、洩れ磁束Ｑは短絡コイル１５により打
ち消された加熱コイルの全体としての電磁相互誘導係数
が増加することが理解される。第５図の実施例において
、短絡コイル１５は銅線の巻回コイルから成るが、導電
性の金属板で短絡コイルを形成することも可能である。
加熱コイルを固定する金属製の取付台で短絡コイルを兼
用した実施例が第６、７図に示される。この実施例にお
いて、取付台１６は電気伝導度及び機械的強度が大きく
、加工の容易な真ちゆうからなり、短絡コイルの役目を
果す。取付台１６はほぼコ字状断面形状を有する棒から
なり、第７図に示される様に、保存容器加熱シール機械
の町動腕ＩＴにねじ１８，１９にて強固に固定されてい
る。取付台１６の長手方向にはこれもコ字状断面形状を
有するフエライト製の磁芯１４が固着されている。磁芯
１４には更に発熱装置を形成するヒータ２０が埋め込ま
れ、このヒータ２０は保存容器の加熱シール工程で保存
容器と加熱コイル装置とが接触する際に、加熱コイル装
置自体が保存容器の熱を奪うことを防止する。このヒー
タ２０は接触型の高周波誘導加熱装置には極めて好適で
あり、もしこのヒータ２０が設けられていない場合には
、所望のシール部の周辺部のみが無用に加熱されてしま
う状態が生じるであろう。加熱コイル１０の加熱辺ＩＯ
Ｂがヒータ２０の前面にまたその無効辺ＩＯＡが取付台
１６に固定され、この結果加熱コイル１０は磁芯１４を
取り巻く様に配置される。
この状態で取付台１６は無効辺ＩＯＡに接近した辺部１
６Ａとその反対側の端部１６Ｂとで磁芯１４の磁気回路
を囲む短絡電流通路を形成し、無効辺ＩＯＡによる洩れ
磁束を吸収する。加熱コイル１０の加熱辺ＩＯＢ及び無
効辺ＩＯＡの前面には銅製の保護板２１，２２が固定さ
れ、加熱コイル１０に損傷が与えられることを防止する
。加熱コイル１０の加熱辺ＩＯＢの近傍にはサーミスタ
等の温度検出装置２３が固定され、常時加熱辺ＩＯＢの
温度が検出される。
加熱辺ＩＯＢの温度は保存容器を形成する積層シートの
内側樹脂膜の溶融温度付近に設定することが望ましく、
このために温度検出装置２３の出力信号は図示していな
いが周知の温度制御回路を介してヒータ２０に供給され
る。以上の構成から明きらかな様に、本発明に係る高周
波加熱コイル装置によれば、高周波加熱コイルは常に適
当に選択された温度に保持されているので、被加熱体と
の接触状態で加熱コイルが熱を奪うことがなく効率の良
い誘導加熱が行なわれる。
本発明によればヒータ２０により所定温度にまで加熱さ
れている加熱コイル１０を被加熱体に接触させることに
より、所望のシール部のみを溶融温度近傍まで急速に温
度上昇させ、被加熱体のその他の部分との間に大きな温
度こう配を形成する。この温度こう配は高周波誘導加熱
とともに所望のシール部のみを短時間で加熱シールする
に多大の効果を奏する。なお、ヒータ２０を設けること
により、加熱コイル装置自体が保存容器の熱を奪うこと
が防止される結果、樹脂膜の発泡を生じさせる憂いが生
じるが、前記ヒータ２０の温度は、煎記発泡を抑えるに
充分低くて足るものである。
第８図には本発明の他の実施例が示され、この実施例で
は加熱コイルの無効辺ＩＯＡがヒータ２０をはさんで加
熱辺ＩＯＢと反対側に位置されている。
取付台１６にはその一部に開口部１６ａＪが形成され、
この開口部１６ａに無効辺ＩＯＡが挿入されている。こ
の実施例によれば加熱コイル装置を小型化できると共に
加熱コイル１０の無効辺ＩＯＡと被加熱物と相互誘導係
数は極めて小さいので、第３図に示すような製袋時の帯
状シールワ を行う際にも好ましいものである。第９図
には加熱コイルの特性例が示され、横軸に加熱時間がま
た縦軸に被加熱体の温度が目盛られている。
特性Ａは加熱コイル温度を常温に近い２５゜Ｃにまた特
性Ｂは１６０゜Ｃに設定した状態をク示し、いづれも高
周波入力は５００ワツトに規制されている。この特性図
から明きらかな様に、被加熱体の温度上昇に極端な差が
生じることが理解される。例えば溶融温度１７５゜Ｃま
で加熱するのにヒータ加熱を含む場合は０．２秒以下で
あるのに対し、無加熱状態では０．５秒も掛かり、この
間に加熱コイルに接触しない隣接する保存容器の他の部
分が誘導加熱により溶融してしまう欠点がある。第１０
図には本発明の他の実施例が示され、金属箔成形容器３
０とその蓋３１とが加熱シールされる。容器３０に調理
済食品が充填された後、樹脂膜の付着されたフランジ部
３３には蓋３１が嵌合される。次に容器３０は取付台１
６に固定されたリング状の加熱コイル１０にそのフラン
ジ部３２が載せられ、上方から加圧リング３３で加圧さ
れる。図示されていないが取付台１６にはその内部にヒ
ータ等の加熱装置及び温度検出装置が内蔵されている。
取付台１６を電気的良導体で形成する場合には短絡現象
を防止するためにその一部３４が切断される。本発明に
よる加熱コイルで高周波誘導加熱によるシールを行う場
合には、前述の説明のように実質的に同じ加熱コイル２
個を用いて加熱コイルの加熱辺でシール部を押圧する方
法と、１個の加熱コイルの加熱辺をシール部へ押圧し、
対向する側にはその加熱コイルの磁芯と磁気回路を形成
すべき磁芯を配置する方法とがあるが両者の加熱特性に
は大差はない。
以上説明した様に本発明に係る高周波誘導加熱コイル装
置によれば、極めて高い力率を得ることができる。
本発明に係るコイルの力率は０．９以上の値にすること
が可能であり、従来の一般的な誘導コイルの力率値が０
．１以下であることと比較してその改良は極めて大きな
効果を奏することが明らかである。高力率の加熱コイル
はその加熱効率を極端に向上することができる。
即ち被加熱物へ供給される電力は加熱コイルの力率に比
例するので、同一の電力を被加熱物に供給する場合、高
力率の加熱コイルでは電流値を減少することができる。
加熱コイルの電流値を減少させることは高周波誘導加熱
装置の製作に際して種々の利点を呈する。
このことは本発明に｝ける加熱コイルが従来に比してそ
の力率が１０倍以上そしてその電流値が１／１０以下に
することを可能にしたことから理解されるであろう。こ
れらの数値は同一の電力を供給するための加熱コイル線
径を１／１０以下にし得ることを意味し、この点は極め
て重要である。加熱コイル線径を細くすることは加熱コ
イルを任意の形状に形成することを容易にする。また電
流値の減少は導線部分の構造を簡単にすることができ更
に導線を細くし冷却装置を必要としない利点を有する。
特に加熱コイルを移動可能としなければならない装置に
おいて径の細い可撓性の導線を用いることができる利点
を有する。本発明に係る高周波加熱コイル装置に適する
電源回路としては電力用トランジスタあるいはサイリス
タを利用して高効率の大出力高周波電力を得ることので
きる小型かつ低廉な高周波加熱装置用電源回路が好適で
ある。
第１１図には本発明に用いる電源回路の基本構成が示さ
れている。
出力トランス２１０は一次巻線２１１と：次巻線２１２
とを含み、一次巻線２１１には電源回路２２０に接続さ
れる中間タツプ２１３を有する。出力トランス２１０の
二次巻線２１２は本発明に係る高周波加熱コイルに接続
される。電源回路２２０は商用電源２２１と全波整流回
路２２２と高周波バイパスコンデンサ２２３とを含み、
全波整流電力を出力トランス２１０の中間タツプ２１３
に印加する。出力トランス２１０の一次巻線２１１の両
端には出力トランジスタ回路２３０，２４０が接続され
、両出力トランジスタ回路２３０，２４０はそれぞれ出
力トランジスタ２３１，２４１、電流制限用抵抗２３２
，２４２、無効電力返還用ダイオード２３３，２４３を
含む。出力トランジスタ２３１，２４１のコレクタはそ
れぞれ一次巻線２１１の両端に接続され、またそのベー
スには発振回路２５０からの信号が駆動回路２３４，２
４４で増巾され印加される。なお駆動回路のトランジス
タ２３５，２３６，２４５，２４６は飽和状態で使用さ
れる．出力トランジスタ２３１のコレクタは帰還回路２
７１、駆動回路２４４を介して出力トランジスタ２４１
のベースに接続され、同様に出力トランジスタ２４１の
コレクタは帰還回路２７２、駆動回路２３４を介して出
力トランジスタ２３１のベースに接続されている。この
実施例では駆動回路２３４，２４４は、帰還信号３７１
，３７２がかなり高電圧のＡ，ｂ点から与えられるため
に生ずる電力損失を低減させるために設けられたもので
この回路のトランジスタは飽和状態で使用される。すな
わち、出力トランジスタ２３１，２４１のベース電圧は
低電圧でよいので、低電圧の電源電圧＋Ｅ，−Ｅをもつ
駆動回路２３４，２４４を設け、帰還信号３７１，３Ｔ
２の電流をこの駆動回路２３４，２４４にて増巾するこ
とにより、帰還信号３７２の電流値を低減可能とし、帰
還抵抗１１１，１１２での電力損失を少＜するものであ
る。駆動回路２３４，２４４はコレクタに正電圧＋Ｅの
印加されたＮＰＮトランジスタ２３５，２４５とコレク
タに負電圧−Ｅの印加されたＰＮＰトランジスタ２３６
，２４６とを含む。駆動回路２３４，２４４には制御ト
ランジスタ １・２７７，２Ｔ８が接続され、これらの
制御トランジスタ２Ｔ７，２７８は通常はオフ状態に保
存されているが、電力制御あるいは過電流保護時にオン
作動する。
制御トランジスタ２７７，２７８のそれぞれのベースに
は電力制御信号Ｃ、過電流保１護信号ｄおよびゼロボル
トスタート信号ｅが印加されている。ゼロボルトスター
ト信号ｅがオフとなり、中間タツプ２１３の脈動電圧が
出力トランジスタ２３１，２４１をオン作動するに十分
となり、出力トラン２ジスタ２３１，２４１のいずれか
不定であるが例えば発振回路２５０を形成する矩形波発
生器の出力Ｊが正で出力トランジスタ２３１がオン作動
しているとする。
すると出力トランジスタ２３１のコレクタａの電圧はゼ
ロに、出力トランジスタ ２２４０のコレクタｂ電圧は
出力トランスの変圧器作用により中間タツプ２１３の電
圧の２倍となる。したがつて出力トランジスタ２３１は
オンに、出力トランジスタ２４１はオフに保持される。
やがて矩形波発生器の出力Ｊが負となり、出力Ｋが正Ｓ
となると、出力トランジスタ２３１の駆動信号はオフと
なるが、出力トランジスタ２３１のオフ作動には蓄積電
荷により若干の遅れが生じ、やがて出力トランジスタ２
３１がオフとなると、出力トランジスタ２３１のコレク
タａが正となり、帰還信号３７２が駆動回路２４４で増
巾され、出力トランジスタ２４１をオン作動させる。以
上の様にして、一方の出力トランジスタのオフ動作を確
認後、他方の出力トランジスタをオン動作させるので、
両出力トランジスタ回路が同時に作動することがな＜、
回路に悪影響を与える電流スパイク等の発生が阻止され
駆動トランジスタ等の破壊が防止される。
【図面の簡単な説明】
第１図は通常の加熱コイルの基本的な偏平渦巻きコイル
形状を示す概略図、第２図は第１図の加熱コイルにより
袋状保存容器を製作する工程を示す平面図、第３図は第
１図の加熱コイルにより袋状保存容器の開口部を気密シ
ールする工程を示す平面図、第４図は従来の加熱コイル
を示す概略図、第５図は本発明に係る高周波加熱コイル
の概略構成図、第６図は本発明に係る高周波加熱コイル
の好適な実施例を示す斜視図、第Ｔ図は第６図の断面図
、第８図は本発明の他の実施例を示す断面図、第９図は
本発明に係る加熱コイルの特性図、第１０図は本発明の
更に他の実施例を示す断面図、第１１図は本発明に好適
な電源回路図である。 １０・・・・・・加熱コイル、１０Ａ・・・・・・無効
辺、１０Ｂ・・・・・・加熱辺、１４・・・・・・磁芯
、１５・・・・・・短絡コイル、２０・・・・・・発熱
装置、２３・・・・・・温度検出装置。

Claims (1)

    【特許請求の範囲】
  1. １ 相接着領域を局部的に有するシートをその接着領域
    において押圧する高周波加熱コイルを具備する高周波加
    熱装置からなり、前記各シートは、その少なくとも一方
    においてうず電流発生によつて発熱する導体箔を前記接
    着領域より広範に延在して積層し、かつ前記導体箔の発
    熱によつて接着するに足る溶融がなされる樹脂材から構
    成されたものであつて、前記高周波加熱コイルの前記シ
    ートへの押圧状態にて前記シートの発熱による熱の前記
    高周波加熱コイルへの伝導を抑制するに足る発熱を生ぜ
    しめる発熱装置を具備させたことを特徴とする高周波加
    熱装置。
JP50026739A 1975-03-05 1975-03-05 高周波加熱コイル Expired JPS5947438B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50026739A JPS5947438B2 (ja) 1975-03-05 1975-03-05 高周波加熱コイル

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50026739A JPS5947438B2 (ja) 1975-03-05 1975-03-05 高周波加熱コイル

Publications (2)

Publication Number Publication Date
JPS51101240A JPS51101240A (ja) 1976-09-07
JPS5947438B2 true JPS5947438B2 (ja) 1984-11-19

Family

ID=12201658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50026739A Expired JPS5947438B2 (ja) 1975-03-05 1975-03-05 高周波加熱コイル

Country Status (1)

Country Link
JP (1) JPS5947438B2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0177335U (ja) * 1987-11-13 1989-05-24

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2579856Y2 (ja) * 1991-07-05 1998-09-03 日本テトラパック株式会社 包装機における管状材料ウエブ加工装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0177335U (ja) * 1987-11-13 1989-05-24

Also Published As

Publication number Publication date
JPS51101240A (ja) 1976-09-07

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