WO1991007860A1 - Thermosoudage - Google Patents

Thermosoudage Download PDF

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Publication number
WO1991007860A1
WO1991007860A1 PCT/GB1990/001737 GB9001737W WO9107860A1 WO 1991007860 A1 WO1991007860 A1 WO 1991007860A1 GB 9001737 W GB9001737 W GB 9001737W WO 9107860 A1 WO9107860 A1 WO 9107860A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
application member
heat sealing
heating
current
Prior art date
Application number
PCT/GB1990/001737
Other languages
English (en)
Inventor
Gerald Buttery
Original Assignee
Storland Plc
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
Priority claimed from GB898925449A external-priority patent/GB8925449D0/en
Priority claimed from GB898925450A external-priority patent/GB8925450D0/en
Application filed by Storland Plc filed Critical Storland Plc
Publication of WO1991007860A1 publication Critical patent/WO1991007860A1/fr

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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
    • B29C65/38—Impulse heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7433—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B29C65/7451—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool the severing tool and the welding tool being movable with respect to one-another
    • 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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—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
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/81—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
    • B29C66/81431—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 cavity, e.g. a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81455—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—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
    • B29C66/914—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
    • B29C66/91431—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 the temperature being kept 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux 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
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/146—Conductive polymers, e.g. polyethylene, thermoplastics
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/58—Heating hoses; Heating collars
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/225—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a coating or being printed, e.g. being applied as a paint or forming a printed circuit
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • 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
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • 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
    • B29C66/83—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
    • B29C66/83521—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on bands or belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • 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

Definitions

  • This invention relates to heat sealing of heat sealable materials, especially of materials employed in packaging.
  • a known heat sealing apparatus has paired, confronting metallic dies, which contain a.c. or d.c. current-supplied resistive heating elements and which are also used to press together the materials being sealed together.
  • the amount of current supplied is controlled by an adjustable rheostat.
  • the metallic dies are typically in the form of steel blocks which take about half an hour to cool down and about the same length of time to heat up again. This results in long periods of non-use when it is necessary to cool the blocks down more or less completely such as in changing between types of packaging materials which require different heat-sealing temperatures.
  • Heat is discharged from the resistive heating elements by intermittently supplying electrical current sufficient to overcome the resistance of the material of the heating ele emt.
  • changes in the required heat-sealing temperature can be neither accurately obtained nor quickly achieved by the combination of such heating elements with such metallic dies.
  • actual heat discharge during heat sealing, and hence the actual heat sealing can be erratic due to the large inherent residual heat of the steel dies.
  • the metallic dies need to be precisely aligned with each other to provide satisfactory heat sealing because equal pressures are needed across the materials being heat-sealed together. However, it is not possible with metallic dies to achieve this in regions which include a change in the thickness of the materials. For example, in sealing along adjoining edges of material including a two-layer gusset, a weakness of the seal is created at the point of transition between the two layers of material and the four layers of material including the gusset.
  • a heat application member for heat sealing materials together comprising a portion of resilient solid material which contains or is in contact with means having high thermal conductivity for providing heat, the member being arranged so as to discharge heat through at least one location on the external surface of the member for heat sealing materials together.
  • the heat application member may be heated by supplying current to electrically-resistive heating elements. It has been found that such a heat application member functions with rapid and exact response to changes in supplied current, which allows precise control of the heat sealing temperature created by the heat application member.
  • the heat application member also has properties of minimal inherent heat retention and rapid heat loss upon cessation of current, which allow fast response times to imposed changes in heat application.
  • the heat application member of the invention also has the advantages of lending itself to the configuration of the materials being heat-sealed together. This overcomes the problem of uneven thicknesses in materials being heat sealed. It has also been found that a relatively low pressure is required at the heat application surface to obtain a good seal.
  • the supply current is pulsed.
  • the heat-sealing temperature can be precisely controlled since the heat application member of this invention is highly responsive to control by current pulses.
  • An important advantage of this is that low temperature melting materials such as polythene can be heat sealed, making in-situ freezing through polythene bags possible.
  • the heat application member according to the invention preferably includes a non-heat-discharging second portion of resilient solid material containing discrete means having a thermal conductivity relatively lower than the thermal conductivity of the first portion to avoid heat discharge from said second portion, wherein the relative thermal conductivities of the first and second portions are so selected and the first and second portions are so arranged with respect to each other as to result in a desired path of current and/or a desired location of heat discharge.
  • heat may be discharged over all or part of the heat-application surface of the heat application member over which materials to be heat sealed are passed, with relatively little heat discharge from the remaining surfaces of the member.
  • Heat may be discharged, for instance, at a series of points on the heat-application surface.
  • the second portion adjoins the first portion via an interface along the length of the member; in use, the second portion may be rearward of the first portion so that heat is generated from the front face of the member.
  • the first and second portions of the heat application member may be made from the same resilient solid material.
  • a preferred material is silicon rubber which has excellent flexibility and excellent heat resistance.
  • the heat application member of the invention may be in reciprocable form such as an elongate element paired with a reciprocable or stationary confronting member, such as a jaw, which may or may not be of similar construction or of conventional type.
  • a conventional confronting member may include a shaped configuration to create a patterned seal.
  • the heat application member of the invention may include sealing and/or cutting means.
  • the current supplied to the heat application member of the invention is advantageously in pulsed form according to an apparatus, circuit or method which will be described below.
  • the heat application member may include electrical means, such as an earth return which can be mechanically or electronically applied, disposed so as to guide the path of current through the member. This is especially advantageous for long heating members.
  • the position of the earth return can be fixed or variable.
  • More than one train of current pulses may be employed for a single heat application member, for instance, pulses may be applied at each end of the member in turn from the different sources.
  • the position of the earth return along the length of the member may divide up the length of the heating surface.
  • a preselected division of the heating surface can therefore provide a plurality of preselected distances over which heat sealing is obtainable.
  • a heat application member of length z can be divided into lengths x and y, which can be used to provide heat sealing over, for example, length x only, y only, x and y alternately, or z.
  • More than one heat application member can be used in parallel, with pulses supplied simultaneously or in turn to each member, also by using the circuit described below.
  • the heat application member may comprise an endless belt for heat sealing materials together, and rotatable means for supporting the member, the belt comprising a plurality of electrically independent heat discharge portions each including respective resistive heating means, and means for forming an electrical circuit through each of one or more of the heating portions to produce a heat discharge at a predetermined place along the path of the endless belt.
  • Such heat sealing apparatus is of especial use with materials being continuously or repeatedly supplied.
  • the endless belt may itself be employed in conveying said materials.
  • the resistive means of the heat-discharge portion may be metallic oxide powder, for example alumina or sine oxide, mixed with the resilient solid material and bonded thereto during manufacture; alternatively the resistive means may be a metallic element, such as tape or wire or etched strip.
  • the means having a lower thermal conductivity may be in the form of randomly distributed non-conductive fibres, preferably ceramic or glass fibre, mixed with the resilient solid material and bonded thereto during manufacture.
  • a resistive heating element is sandwiched between the resilient solid material of the heat discharge portion and the non-heat discharge portion. This increases the size of the heat reservoir provided by the heat application member.
  • the rotary means and the means for forming an electrical circuit may comprise a pair of spaced-apart rotatory wheels, at least one of which includes an electrically conductive path to its exterior.
  • the rotary means and belt may be suitably disposed with respect to a sealing station adjacent one of the long sides of the endless belt.
  • the sealing station may comprise an elongate contact surface, spaced from the belt so that the belt will pull material through the space.
  • the means for forming an electrical circuit may include one or both wheels or conductive other means located interiorly of the belt, preferably in the space between the wheels and adjacent the interior of the endless belt for electrical communication with the endless belt, whereby heat is discharged from said space.
  • one or more discrete earth return means are employed whereas, for belts having discrete means for current pick-up, elongate conductive means may be employed, whereby the or each electrical circuit of heating current can be maintained constantly with time at the predetermined heat sealing place.
  • the discrete means for current pick-up may include inward metallic protrusions from the belt, which are engageably slidable over the wheel exteriors and over the conductive means.
  • earth return means for example a metallic or metallised bridge member, may occupy substantially the whole of the free distance between the wheels.
  • the whole of such length must be occupied continuously by heating portions of the moving endless belt through each of which an electrical circuit is completed.
  • the earth return means could be alternatively electronically or mechanically applied along the whole distance between the wheels or along a reduced length to produce a corresponding reduced length of heat discharge.
  • the position of such earth return could be fixed or variable to vary the heat discharge length.
  • More than one current source may be employed, for instance one source may be applied at each end of the predetermined place, and trains of current pulses may be applied in turn from the different sources to supply more than one heating portion at once. This is advantageously achieved using a circuit as described below.
  • both wheels are employed to supply electrical current to the endless belt alternately and in opposite directions, in order to supply more than one heating portion of the belt at once.
  • the wheels are preferably of identical diameter and the centres of the wheels are spaced apart by a distance equal to half their circumference; the endless belt comprises four said heat discharge portions, each of a substantially identical length equal to slightly less than half the circumference of the wheels. This has been found to ensure continuous or substantially continuous heat sealing over the afore-mentioned length of space adjacent the belt and between the wheels.
  • a second bridge member or other conductive means may be employed in a corresponding position between the wheels opposite the first bridge member, whereby heat sealing may be undertaken at two stations.
  • apparatus for heat sealing comprising a source of pulsed current, means for controlling the source of pulsed current, and a heat application member electrically connected with the current source and including or in contact with resistive means for receiving pulsed current from the source and supplying heat through at least one location on the external surface of the member to materials to be heat sealed together, the heat application member comprising a portion of resilient solid material for contacting the materials to be heat sealed together and in thermal contact with the resistive means, preferably via a material of high thermal conductivity.
  • a method of heat sealing materials comprising supplying pulsed current of predetermined magnitude, to create a desired heat sealing temperature, to at least one heat application member comprising a resilient solid material which includes or is in contact with resistive means arranged so as to produce heat discharge through at least one location on the external surface of the heat application member, and contacting materials to be heat sealed together with the or each heat-discharge location on the heat application member so as to discharge heat from the heat application member to the materials and create the desired heat-sealing temperature to thereby seal the materials together.
  • This method and apparatus may be used separately but are more advantageously used together.
  • Each of the method and apparatus for heat sealing results in highly effective heat sealing since the heat sealing temperature may be accurately and rapidly controlled owing to the pulsed nature of the current. It has been found that the temperature can be controlled to an accuracy of + 1°C. Heat sealing temperatures in excess of 200°C can be obtained. Control of the frequency and size of the pulsed current and the time of application of the current is achieved. Such heat sealing is especially useful for form-fill-seal packaging because it can be so accurately controlled: an example is in wrapping of frozen foods with polythene without damaging the food or the polythene.
  • the location of heat sealing can also be controlled: for instance, by employing spaced, intermittent heat discharge locations, non-continuous sealing is obtained.
  • the pulsed nature of the current advantageously allows for efficient computerised control of the heat sealing.
  • records of the different pulse configurations required for different heat sealing processes can be stored in a microprocessor and the heat sealing procedure appropriate for a specific kind of material, for example polythene or laminated plastics, may be selected and carried out under the pre-programmed control of the microprocessor.
  • performance data can be sensed and fed back to the computer so as to monitor and adjust the heat sealing procedure as necessary.
  • means for measuring the temperature of the heating element may be employed.
  • the apparatus can be pre-programmed to follow any desired heat sealing operation, such as repeatedly alternating between two frequencies in response to machine movement.
  • the preferred range of current pulse duration is 5-20 ms, for example 10 milliseconds. It is preferred that direct current pulses are employed since these allow directional control.
  • Earth return means may also be contained in or associated with the heat-seal application member to guide the current therein, as mentioned above.
  • Heat sealing according to the invention may be used in all applications of heat sealing, for example in making seams, in bag closure and in carton seal.
  • Apparatus for heat sealing may include means for providing a heating circuit, as now described.
  • a heating circuit for controlling current supplied to a heat application member including a portion of resilient solid material for heat sealing materials together, the heating circuit comprising means for producing current pulses, and means for controlling the current pulses so as to obtain the pulse frequency required for producing a preselected heat sealing temperature.
  • This circuit is highly effective in producing a controllable heating temperature at which heat sealing is required to take place since the pulse frequency is controlled, and may be incorporated in heat sealing apparatus according to the second aspect of the invention.
  • This circuit may include means for imposing, as well as the means for producing the preselected heating temperature, a minimum heating temperature so as to ensure that the heating temperature does not fall below the temperature at which effective sealing takes place.
  • This means for imposing a minimum heating temperature may be provided by a second source of current pulses. More than two sources of current pulses can be employed for providing a corresponding number of temperatures. The use of an additional source or sources provides accurate control of a plurality of temperatures and the sources can be effectively interfaced with a microprocessor.
  • the pulse frequency for the low temperature is about half the pulse frequency for the high temperature.
  • the low temperature may be employed to retain a minimum heating temperature while materials are not being heat sealed so that it does not take so long to regain the desired heat sealing temperature and so that material will not stick to the cold die.
  • the circuit may include means for imposing a maximum heating temperature so as to ensure that the heating temperature does not exceed a safe value appropriate for materials being sealed together.
  • the means for producing current pulses preferably comprise; a pulse generator in series with a pulse shaper, which is connected across a power supply. The voltage supplied to the pulse generator controls the pulse frequency.
  • the circuit may include means for producing current pulses in parallel and/or means for producing current pulses in series.
  • the series mode may be provided by an earthed transistorised switch which is in series between the aforementioned pulse shaper and the heat application member which is in series with a dc supply.
  • the parallel mode may be provided by having a pair of such earthed transistorised switches in parallel, the second switch being in series with a selector switch. More than two transistorised switches may be employed in parallel arrangement by using additional pulse shapers in series therewith. Thus, one or more sources of current pulses may be provided. This may be used to supply a single heat application member or a plurality of such members. For instance, four heat application members may be used to heat seal a cover to a tray containing food.
  • Figure 1 is a diagrammatic representation showing the main components of an elongate heat sealing apparatus including a heat application member;
  • Figure 2 is a diagrammatic representation of a modified elongate heat application member
  • FIGS 3 to 7 show different uses of heat application members of the invention
  • Figure 8 shows an endless heat application belt according to the invention
  • Figure 9 shows a heat apparatus including the heat application belt of Figure 8.
  • Figure 10 is a diagrammatic view showing the apparatus of Figure 9 in more detail.
  • Figure 11 is a diagram of a circuit of a control device for producing current for heating a heat application member according to the invention.
  • a heat sealing apparatus illustrated schematically in Figure 1, employs a heat sealing member 1 electrically connected with a programmed pulsed-current control device 2 for the supply of high-energy pulses.
  • a d.c. power supply unit 3 (24v in this embodiment) is electrically connected between the control device 2 and the heat sealing member 1.
  • the reciprocable heat sealing member 1, as shown in Figure 1, consists of an elongate metal backing jaw 4 in which an elongate heat application member 5 is mounted so as to project from one face of the jaw.
  • the heat application member 5 consists essentially of a rectangular block made of silicon rubber and formed in two parts, a rearward elongate portion 5a being joined at an interface along the length of the member to a forward elongate portion 5b which includes the front face 6 of the heating member which is the surface through which heat is applied. At the interface is disposed a resistive heating element in the form of tape or wire (not shown) .
  • the heating element of the heat application member is insulated and a temperature feedback transducer is bonded to a beryllium copper strip (not illustrated) . The temperature is fed back to the microprocessor and the heating cycle is adjusted if required.
  • the temperature of the front portion of the heating element is about 180 C
  • the temperature of the rear portion is only about 70°C.
  • the front and rear portions are adhered together during moulding of the heating member. They may alternatively be laminated together.
  • the control device 2 is under the control of a microprocessor (not shown) which contains a range of programs suitable for different types of materials to be heat sealed together and which can be selected using a panel 7 on the control device.
  • the programs dictate the requisite heating cycle and in particular control the appropriate pulse frequency and the quantity of pulses supplied and hence the amount of current.
  • the current is supplied to the control unit at a voltage of 24V from the power supply unit 3. It is possible to manually control the pulse frequency by push-button controls 8 on the control panel. Pulses are typically 10 milliseconds long. An on-off switch 9 is provided on the power supply unit so that heating can be stopped manually if necessary. When the apparatus is turned on, a surge of current arises, which is useful for pre-heating purposes.
  • the apparatus may be used to control more than one heat application member, including cooperative members.
  • the control device 2 includes a circuit, illustrated in Figure 11, for forming current pulses which are used to heat the heating member or portions on the endless belt.
  • the circuit has four inputs interfaced to a microprocessor, the second and third of which are controlled by push-buttons 8 on the control panel of the control device;
  • a maximum temperature setting 18 which controls a unit (not shown) which takes a temperature feedback from the heating member and, should the temperature reach the maximum setting, all thermal current would be automatically cut off until the temperature fell back to the required weld temperature;
  • a higher level setting 20 which controls on the basis of pulse rate the ideal thermal current flow through the heating member to create a perfect weld for a specific material
  • an interface unit 21 which will select between the lower level and the higher level, its purpose being to ensure that, if the heat sealing apparatus ceases to run for operational reasons, excess temperature will not build up in the heating member due to the fact that materials are not being processed, there thus being no heat sink effect.
  • the lower level setting 19 and the higher level setting 20 provide two channels which can be considered as a single channel within the circuit.
  • the low and high level settings each have a pulse generator 22, 23 which generates pulses at the rates set by the respective setting point.
  • Each pulse generator is then followed by an on-off gate 24, 25. Only one of these gates can be opened at any one time dependent on the conditions being applied at the input 21. This therefore selects whether the pulses from generator 22 or generator 23 reach a pulse shaper 26.
  • the pulse shaper 26 creates an electrical pulse shape which has been set at e.g. 10m/s and the circuit therefore ensures that one of two rates of pulses can be passed through, dependent on the setting of selector 21.
  • pulses are then fed through an on-off gate 27 which can be closed by a temperature compensator 18b. If the temperature in the die reaches a critical state or the maximum set temperature at input 18, this gate 27 will close, preventing the pulses passing through the gate 27. As long as the temperature is below the maximum temperature setting at input 18, the pulses can pass freely through the gate 27.
  • the pulses then switch on and off one of two earthed transistorised power switches 28, 29, connected across the dc supply from the power supply unit 3 via the heat sealing member 1 for controlling the heating of the heating element.
  • the power supply is conveniently set at 24 volts, 13 amps. Because the switching is of such short duration and high frequency, a 65 amp current is generated through the heating element in the heat sealing member 1.
  • the two earthed transistorised switches 28, 29 are in parallel and a selector 27b switch can be used to select whether thermal current is produced either in parallel or series. In series selection one pulse will follow another, providing a cascading operation.
  • a first heat application member la is of the type earlier described.
  • the opposed member lb has in addition to the basic form a cut-off wire 10 on the front face 6 of the forward portion 5b for simultaneous seal and cut-off of packages and for forming a bead seal.
  • Figure 4 shows heat application members la, lb each incorporating in-line slots 11a, lib through which a cut-off knife 12 is passed for use in gusset-bag manufacture.
  • Figure 5 illustrates a cut-off blade 13 incorporated in a silicon rubber support 14, which may be part of a heat application member in accordance with the invention and is used especially for seal and cut-off of polythene bags.
  • Figure 6 shows a pair of heat application members, one of which includes a chrome metal pattern strip 15 on its heating face 6. This is for producing a patterned seal.
  • a knife may be employed for cut-off as in Figure 4.
  • a further modified heat application member lc shown in Figures 7a, 7b and 7c, is expandable for producing an even pressure over the seal area and conforming to the shape of the materials being sealed together.
  • the rearward portion 5a of the heat application member lc has a hollow interior 16 and inlet passages through which compressed air is introduced via a pipe 16a for carrying out sealing under pressure, whereby the forward face 17 of the rearward portion curves outwardly under pressure.
  • FIG. 7b is a cross-section without applied pressure, showing the member 5b spaced from a film substrate;
  • Figure 7c shows the forward face 17 deformed under pressure and the gap closed.
  • a modified heat appliction member shown in Figure 2, shows a silicon rubber forward member 5b seated on a heating wire H, which is disposed on a base B.
  • the rearward portion contains randomly distributed ceramic fibre for transmission of current without heat build-up.
  • the powder is mixed with liquid silicon rubber and a hardener during manufacture.
  • the forward portion contains 60 weight % zinc oxide powder for building up heat upon the transmission of current and for discharging heat through the front surface for heat sealing.
  • a heat application member 81 for heat sealing comprises an endless belt having four heating portions a, b, c, d, of equal length formed by electrical discontinuities in the material of the belt while maintaining physical connection between the four portions.
  • Each heating portion of the endless belt consists of an outer elongate heating layer formed of silicon rubber joined via an interface along the length of the member to an inner elongate non-heat discharging layer comprising silicon rubber containing randomly distributed ceramic fibre for transmission of current without heat build-up.
  • the powder is mixed with liquid silicon rubber and a hardener during manufacture.
  • the heating portion includes the external surface of the heat application member. At the interface is disposed a resistive heating element in the form of tape or wire (not shown) .
  • the heating element of the heat application member is insulated and a temperature feedback transducer is bonded to a beryllium copper strip (not illustrated) . The temperature is fed back to the microprocessor and the heating cycle is adjusted if required.
  • the temperature of the heating outer portion is about 180°C whereas the temperature of the inner portion is only about 70°C.
  • the outer and inner portions are adhered together during moulding of the heating member. They may alternatively be laminated together.
  • the endless belt 81 is mounted, as shown in Figures 9 and 10, for rotation on a pair of similarly-rotatory wheels 82 at a heat sealing station S, which includes a cold elongate contact surface 83 spaced from the belt to provide a passageway 84 for materials to be heat sealed together. As shown, materials will be pulled to the left in the direction of arrows M through the passageway upon anti-clockwise rotation of the belt and continuous heat-sealing is possible with continuous supply of materials. Electrical contact to the pulse control unit is provided at the axes of the wheels.
  • the endless belt may be used in a heat sealing apparatus as already described with reference to Figure 1.
  • a metallic shoe 85 (not shown in Figure 9) is disposed inwardly of the endless belt 81 and adjacent to the belt so that metallic feet 86 on the inner face of the belt 81 at each end of each heating portion a, b, c, d, can slide over the exterior of the shoe 85.
  • the shoe occupies substantially the whole length of the distance between the wheels 82 adjacent the belt 81.
  • the wheels are each of circumference C and the centres of the wheels are spaced apart by a distance / 2 C.
  • the length of each heating portion is slightly less than / 2 C, accounting for the required discontinuity between each heating portion and to accommodate any expansion of the resistive member during heating.
  • Each wheel 82 is electrically connected to the heating circuit of the control device 2, already described above in conjunction with Figure 1.
  • the parallel mode is used to supply each wheel alternately, one wheel operating on a master pulse and the other on a slave pulse.
  • the shoe 85 has two earth returns, one for each wheel. This allows any adjacent pair of heating portions to be kept substantially constantly supplied with heating current.
  • the apparatus described above may incorporate feed-back sensors for monitoring the sealing performance, for example means at the heating surface of the heat application member for detecting the heat-sealing temperature, and computerised means for assessing the properties monitored and for adjusting the heating cycle if required.
  • the flexibility of the forward face of heat application members according to the invention allows an effective heat seal to be formed since the member adjusts to the shape of materials being heat sealed together.
  • the forward portion contains 60 weight % zinc oxide powder for building up heat upon the transmission of current and for discharging heat through the front surface for heat sealing.
  • heat sealing apparatus may be supervised wholly manually.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)

Abstract

Un élément applicateur de chaleur (5) servant à thermosouder des matériaux comporte une partie en matériau solide élastique (56) et un moyen résistant servant à fournir de la chaleur. L'élément est disposé pour dégager de la chaleur à travers au moins un endroit situé sur sa surface externe (6). Il peut être incorporé à un appareil de thermosoudage comportant une paire de mâchoires opposées interactives ou peut comprendre une ceinture sans fin. On décrit également un procédé de thermosoudage et un circuit chauffant.
PCT/GB1990/001737 1989-11-10 1990-11-12 Thermosoudage WO1991007860A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB898925449A GB8925449D0 (en) 1989-11-10 1989-11-10 Heat sealing
GB8925449.4 1989-11-10
GB898925450A GB8925450D0 (en) 1989-11-10 1989-11-10 Heat sealing
GB8925450.2 1989-11-10

Publications (1)

Publication Number Publication Date
WO1991007860A1 true WO1991007860A1 (fr) 1991-05-30

Family

ID=26296184

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/001737 WO1991007860A1 (fr) 1989-11-10 1990-11-12 Thermosoudage

Country Status (1)

Country Link
WO (1) WO1991007860A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451286A (en) * 1991-02-25 1995-09-19 Weldan A/S (Evald A. Nyborg A/S) Method of welding thermoplastic material
EP0918623A1 (fr) * 1996-07-10 1999-06-02 Harold D. Hutchinson Appareil de thermoscellage de sacs en plastique
CH701562A1 (de) * 2009-07-20 2011-01-31 Elag Verpackungen Ag Siegelvorrichtung und Verfahren.
EP3656534A1 (fr) * 2018-11-26 2020-05-27 Marek Gasiorowski Système de conditionnement par film de produits thermoformables en portions et convoyeur modulaire équipé d'un tel système

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274759B (de) * 1964-12-12 1968-08-08 Harry Jung Elektrische Anwaerme-Vorrichtung fuer flaechenhafte Kunststoff-Druckformen
US3484325A (en) * 1966-07-13 1969-12-16 John M Pendleton Apparatus for sealing thermoplastic films
US4058704A (en) * 1974-12-27 1977-11-15 Taeo Kim Coilable and severable heating element
GB2015423A (en) * 1978-03-03 1979-09-12 Toyo Syokuhin Kikai Kk Wrapping machine
JPS57169316A (en) * 1981-04-10 1982-10-19 Masahiro Ogiwara Sealing apparatus
EP0155548A2 (fr) * 1984-03-10 1985-09-25 Optima-Maschinenfabrik Dr. Bühler GmbH & Co. Dispositif pour souder des feuilles

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1274759B (de) * 1964-12-12 1968-08-08 Harry Jung Elektrische Anwaerme-Vorrichtung fuer flaechenhafte Kunststoff-Druckformen
US3484325A (en) * 1966-07-13 1969-12-16 John M Pendleton Apparatus for sealing thermoplastic films
US4058704A (en) * 1974-12-27 1977-11-15 Taeo Kim Coilable and severable heating element
GB2015423A (en) * 1978-03-03 1979-09-12 Toyo Syokuhin Kikai Kk Wrapping machine
JPS57169316A (en) * 1981-04-10 1982-10-19 Masahiro Ogiwara Sealing apparatus
EP0155548A2 (fr) * 1984-03-10 1985-09-25 Optima-Maschinenfabrik Dr. Bühler GmbH & Co. Dispositif pour souder des feuilles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patents Abstracts of Japan, volume 7, no. 12 (M-186)(1157), 19 January 1983; & JP-A-57169316 (MASAHIRO OGIWARA) 19 October 1982 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451286A (en) * 1991-02-25 1995-09-19 Weldan A/S (Evald A. Nyborg A/S) Method of welding thermoplastic material
EP0918623A1 (fr) * 1996-07-10 1999-06-02 Harold D. Hutchinson Appareil de thermoscellage de sacs en plastique
EP0918623A4 (fr) * 1996-07-10 2000-12-27 Harwil Corp Appareil de thermoscellage de sacs en plastique
CH701562A1 (de) * 2009-07-20 2011-01-31 Elag Verpackungen Ag Siegelvorrichtung und Verfahren.
EP3656534A1 (fr) * 2018-11-26 2020-05-27 Marek Gasiorowski Système de conditionnement par film de produits thermoformables en portions et convoyeur modulaire équipé d'un tel système

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