NL8103851A - METHOD FOR WELDING SHEETS OR PLATES FROM THERMOPLASTIC MATERIAL AND APPARATUS FOR CARRYING OUT THIS METHOD - Google Patents

METHOD FOR WELDING SHEETS OR PLATES FROM THERMOPLASTIC MATERIAL AND APPARATUS FOR CARRYING OUT THIS METHOD Download PDF

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Publication number
NL8103851A
NL8103851A NL8103851A NL8103851A NL8103851A NL 8103851 A NL8103851 A NL 8103851A NL 8103851 A NL8103851 A NL 8103851A NL 8103851 A NL8103851 A NL 8103851A NL 8103851 A NL8103851 A NL 8103851A
Authority
NL
Netherlands
Prior art keywords
wedge
sheets
thermoplastic material
overlapping edges
hot
Prior art date
Application number
NL8103851A
Other languages
Dutch (nl)
Original Assignee
Gundle Holdings Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gundle Holdings Ltd filed Critical Gundle Holdings Ltd
Publication of NL8103851A publication Critical patent/NL8103851A/en

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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
    • B29C65/40—Applying molten plastics, e.g. hot melt
    • B29C65/42—Applying molten plastics, e.g. hot melt between pre-assembled parts
    • 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
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • B29C65/24—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
    • B29C65/26—Hot fluid
    • 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
    • B29C65/28—Flame or combustible material
    • 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
    • B29C65/32—Induction
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • 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
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/524—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive by applying the adhesive from an outlet device in contact with, or almost in contact with, the surface of the part 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
    • 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
    • B29C66/70—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
    • B29C66/83—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
    • B29C66/8362—Rollers, cylinders or drums moving relative to and tangentially to 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
    • B29C66/90—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
    • B29C66/914—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
    • 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
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1412—Infrared [IR] radiation
    • 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
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or 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
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C66/91653—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 voltage, i.e. the electric potential difference or electric tension
    • 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
    • B29C66/91931—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 in explicit relation to the fusion temperature or melting point of the material of one of 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/953—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the humidity
    • B29C66/9532—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the humidity of the parts to be joined, i.e. taking the humidity of the parts to be joined into account
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

__ § * * -1- 22037/CV/mv__ § * * -1- 22037 / CV / pl

Korte Aanduiding: Werkwijze voor het aan elkaar lassen van vellen of platen uit thermoplastisch materiaal en inrichting voor het uitvoeren van deze werkwijze.Brief Description: Method for welding sheets or plates of thermoplastic material together and device for performing this method.

5 De uitvinding heeft betrekking op een werkwijze voor het lassen van thermoplastisch materiaal en meer in het bijzonder op het lassen van thermoplastische vellen of platen en op een inrichting voor het uitvoeren van deze werkwijze.The invention relates to a method for welding thermoplastic material and more particularly to welding thermoplastic sheets or plates and to an apparatus for carrying out this method.

Bij het overlappend lassen van thermoplastische vellen of platen 10 worden de elkaar overlappende randen of tegenover elkaar gelegen oppervlakken daarvan in het algemeen gelast op een van de volgende wijzen: (a) De oppervlakken worden verhit tot boven de smelttemperatuur met behulp van een verhitte metalen wig, welke daar overheen wordt gevoerd.In overlapping welding of thermoplastic sheets or plates 10, the overlapping edges or opposed surfaces thereof are generally welded in one of the following ways: (a) The surfaces are heated above the melting temperature using a heated metal wedge which is passed over it.

De gesmolten oppervlakken worden dan tegen elkaar gedrukt totdat het ma- 15 teriaal onder het smeltpunt is gekomen en is gestold.The melted surfaces are then pressed together until the material is below the melting point and solidified.

(b) De oppervlakken worden verhit tot een bepaalde temperatuur, in het algemeen onder het smeltpunt onder gebruikmaking van een voor-verwarmer. Voor het waarborgen van een juist smelten van de vellen voor het lassen wordt dan aanvullende warmte toegevoerd door toevoeging van 20 verder gesmolten thermoplastisch materiaal in een voldoende hoeveelheid en op een voldoend hoge temperatuur om smelten van de oppervlakken van de twee aan elkaar te hechten vellen te waarborgen. De oppervlakken worden dan tegen elkaar gedrukt, zodat een lassen plaatsvindt indien de temperatuur van het materiaal daalt tot onder zijn smeltpunt.(b) The surfaces are heated to a certain temperature, generally below the melting point using a preheater. To ensure proper melting of the sheets before welding, additional heat is then supplied by adding 20 further molten thermoplastic material in a sufficient amount and at a sufficiently high temperature to melt the surfaces of the two sheets to be bonded together. safeguards. The surfaces are then pressed together so that a welding takes place when the temperature of the material drops below its melting point.

25 In de boven genoemde gevallen wordt de warmte voor het smelten en/ of voor het voorverwarmen op bekende wijze toegevoerd door hetzij: (i) Een hete metalen wig, waaraan door geleiding warmte wordt toegevoerd; de warmtebron is daarbij gebruikelijk een electrisch element, een direct inwerkende vlam of een heet gas.In the above-mentioned cases, the heat for melting and / or for preheating is supplied in known manner by either: (i) A hot metal wedge, to which heat is supplied by conduction; the heat source is usually an electric element, a directly acting flame or a hot gas.

30 (ii) Een straal heet gas, zoals bijvoorbeeld lucht, dat gebruike lijk wordt verhit met behulp van een electrisch element of een vlam.(Ii) A jet of hot gas, such as, for example, air, which is usually heated by means of an electric element or a flame.

(iii) Straling, gebruikelijk in het infrarode deel van het spectrum, maar eveneens omvattende straling van andere geschikte golflengtes.(iii) Radiation, usually in the infrared part of the spectrum, but also including radiation of other suitable wavelengths.

Voor het waarborgen van een constante lastemperatuur in de ge-35 vallen (ii) en (iii) is het noodzakelijk de temperatuur van de aan elkaar te lassen ttermoplastische vellen waar te nemen en de warmtetoevoer te vari-- eren teneinde te compenseren voor temperatuurvariaties. Het waarnemen van de temperatuur houdt echter geen rekening met factoren, zoals vochtig- 8103851 ,i' * - -2- 22037/CV/mv heid op de vellen, welke aanvullende warmte vereist voor verdamping maar waardoor veroorzaakt kan worden, dat de oppervlakte temperatuur lager zal zijn dan vereist.To ensure a constant welding temperature in cases (ii) and (iii) it is necessary to observe the temperature of the ttermoplastic sheets to be welded together and to vary the heat supply to compensate for temperature variations. However, the observation of the temperature does not take into account factors such as moisture on the sheets, which requires additional heat for evaporation but which can cause the surface temperature to evaporate. will be lower than required.

Om een constante las temperatuur te waarborgen in het geval dat 5 de hete wig in contact is met het vel in de hierboven genoemde gevallen (a) en (i) is het voldoende de temperatuur van de wig zo dicht mogelijk bij het werkoppervlak van de wig waar te nemen en te compenseren voor temperatuurvariaties door bijstelling van de warmte toevoer. De tijdver-traging veroorzaakt door geleiding van de warmte in de wig kan resulteren 10 in een onvoldoende lassing.To ensure a constant welding temperature in the event that the hot wedge is in contact with the sheet in the above cases (a) and (i), it is sufficient to maintain the temperature of the wedge as close as possible to the working surface of the wedge to observe and compensate for temperature variations by adjusting the heat supply. The time delay caused by conduction of the heat in the wedge can result in insufficient welding.

Een ander probleem, dat gebruikelijk is bij de las/verbindingswerk-wijze (a) ontstaat in het geval, dat de verbinding zowel mechanisch gezond als lekbestendig moet zijn. In het geval dat de randen van de aan elkaar te hechten vellen niet absoluut vlak zijn vormen zich kleine 15 materiaalgolven voor de laswig. Deze golven bewegen van tijd tot tijd over de laswig als een vouw, welke niet is gelast en zodoende een doortocht voor fluidum vormen.Another problem common to the welding / joining method (a) arises in the case where the joint must be both mechanically sound and leak resistant. In the event that the edges of the sheets to be bonded together are not absolutely flat, small material waves form in front of the welding wedge. These waves from time to time move over the welding wedge as a fold, which has not been welded, and thus form a passage for fluid.

Een oogmerk van de uitvinding is het verkrijgen van een verbeterde werkwijze en inrichting voor het aan elkaar lassen van vellen en 20 thermoplastisch materiaal.An object of the invention is to obtain an improved method and device for welding sheets and thermoplastic material together.

Volgens de uitvinding omvat een werkwijze voor het aan» elkaar lassen van vellen uit thermoplastisch materiaal de volgende stappen: (i) Het zodanig plaatsen van twee te lassen vellen, dat zij althans nagenoeg nabij elkaar zijn gelegen met een paar van hun randen 25 in een overlappende verhouding: (ii) Het bewegen van een hete wig tussen de overlappende randen teneinde in contact te komen met de naburig oppervlakken van de beide vellen, waarbij de wig is op een temperatuur, welke hoog genoeg is voor het smelten van beide oppervlakken; 30 (iii) Het toevoegen van een hoeveelheid gesmolten thermoplastisch materiaal tussen de overlappende randen, en (iv) het tegen elkaar drukken van de overlappende randen en het toelaten van een koelen daarvan, zodat de oppervlakken althans nagenoeg volledig worden verbonden door het thermoplastische materiaal van de vellen 35 en eventuele holtes of plooien worden gevuld door de aanvullende hoeveelheid thermoplastisch materiaal.According to the invention, a method of welding sheets of thermoplastic material together comprises the following steps: (i) Placing two sheets to be welded such that they are at least substantially adjacent to each other with a pair of their edges 25 in a overlapping ratio: (ii) Moving a hot wedge between the overlapping edges to contact the adjacent surfaces of both sheets, the wedge being at a temperature high enough to melt both surfaces; (Iii) Adding an amount of molten thermoplastic material between the overlapping edges, and (iv) pressing the overlapping edges together and allowing cooling thereof so that the surfaces are at least almost completely joined by the thermoplastic material of the sheets 35 and any voids or pleats are filled by the additional amount of thermoplastic material.

Verder wordt volgens een aspect van de uitvinding het aanvullende themoplastische materiaal toegevoegd tussen overlappende randen op een 8103851 -3- 22037/CV/rav f ft plaats althans nagenoeg nabij het deel van de door de hete wig gesmolten oppervlakken.Furthermore, in accordance with an aspect of the invention, the additional themoplastic material is added between overlapping edges at a location 8103851-32037 / CV / rav fft substantially near the portion of the hot wedge melted surfaces.

Volgens een tweede aspect van de uitvinding omvat een hete wig, welke bestemd is voor gebruik in het lassen van de overlappende randen 5 van thermoplastische vellen een wig van een geschikt materiaal en middelen voor het verhitten van de wig in de vorm van een regelbare inductie winding of dergelijke.According to a second aspect of the invention, a hot wedge intended for use in welding the overlapping edges of thermoplastic sheets comprises a wedge of a suitable material and means for heating the wedge in the form of an adjustable induction coil or similar.

Volgens een derde aspect van de uitvinding omvat een hete wig voor gebruik in het lassen van de overlappende randen van thermoplastische vel-10 len een wig uit geschikt materiaal en weerstandsverwarmingsorgaan voor de wig voorzien van middelen voor het doorvoeren van een stroom met hoog amperage en laag voltage door de wig.According to a third aspect of the invention, a hot wedge for use in welding the overlapping edges of thermoplastic sheets comprises a wedge of suitable material and wedge resistance heater provided with means for carrying a high amperage and low current voltage through the wedge.

Verder omvat de wig van zowel het tweede als het derde aspect van de uitvinding een temperatuur waarneeminrichting, die daarin is opgenomen 15 voor het regelen van de verwarmingsorganen voor de wig.Furthermore, the wedge of both the second and third aspects of the invention includes a temperature sensing device included therein for controlling the wedge heaters.

De uitvinding zal hieronder nader worden uiteengezet aan de hand van bijgaande figuren waarin schematisch een drietal uitvoerings-voorbeelden van de uitvinding zijn weergegeven.The invention will be explained in more detail below with reference to the accompanying figures, which schematically show three exemplary embodiments of the invention.

Fig. 1 toont schematisch een aanzicht op een tweetal overlappende 20 vellen uit thermoplastisch materiaal, welke met elkaar worden verbonden met behulp van een wig volgens het eerste uitvoeringsvoorbeeld.Fig. 1 schematically shows a view of two overlapping sheets of thermoplastic material, which are joined together by means of a wedge according to the first exemplary embodiment.

Fig. 2 toont schematisch een aanzicht op overlappende vellen uit thermoplastisch materiaal, welke met elkaar worden verbonden met behulp van een wig volgens het tweede uitvoeringsvoorbeeld.Fig. 2 schematically shows a view of overlapping sheets of thermoplastic material, which are joined together by means of a wedge according to the second exemplary embodiment.

25 Fig, 3 toont schematisch een aanzicht op elkaar overlappende randen van thermoplastisch materiaal, welke met elkaar worden verbonden onder gebruikmaking van aanvullend thermoplastisch materiaal.Fig. 3 schematically shows a view of overlapping edges of thermoplastic material, which are joined together using additional thermoplastic material.

* Fig.« 4 is een eindaanzicht op twee elkaar overlappende vellen ther moplastisch materiaal waarvan de randen met elkaar worden verbonden 30 onder gebruikmaking van een hete wig en aanvullend thermoplastisch materiaal.* Fig. 4 is an end view of two overlapping sheets of thermoplastic material the edges of which are joined together using a hot wedge and additional thermoplastic material.

In het eerste uitvoeringsvoorbeeld van de uitvinding zoals weergegeven in* fig. 2 worden de naburige oppervlakken 1 en 2 van de overlappende randen 3 en 4 van twee vellen uit thermoplastisch materiaal met 35 elkaar verbonden onder gebruik making van een hete wig 5. Deze hete wig 5 wordt verhit onder gebruik making van een uitwendig opgestelde inductie-winding 6.In the first exemplary embodiment of the invention as shown in FIG. 2, the adjacent surfaces 1 and 2 of the overlapping edges 3 and 4 of two sheets of thermoplastic material are joined together using a hot wedge 5. This hot wedge 5 is heated using an externally disposed induction coil 6.

De hete wig wordt bewogen tussen de oppervlakken 1 en 2 in de 8103851 I t -4- 22037/CV/mv met de pijl X aangeduide richting. Indien de wig beweegt smelt deze de oppervlakken, welke dan tegen elkaar worden geknepen met behulp van een rol 7. Op deze wijze wordt het gesmolten materiaal van de oppervlakken 1 en 2 in contact met elkaar gebracht waarop dit materiaal samen, stolt in-5 dien de temperatuur van het materiaal daalt beneden het smeltpunt daarvan, waardoor de vellen aan elkaar worden gelast.The hot wedge is moved between surfaces 1 and 2 in the direction 8103851 I t -4- 22037 / CV / mv marked with arrow X. As the wedge moves, it melts the surfaces, which are then squeezed together using a roll 7. In this way, the molten material of surfaces 1 and 2 is brought into contact with each other, on which this material solidifies, if necessary. the temperature of the material drops below its melting point, whereby the sheets are welded together.

Voor het regelen van de temperatuur van de hete wig 5 is een temperatuur waarneeminrichting 8 opgesteld in de hete wig zo dicht mogelijk bij het puntvormige einde 9 daarvan. Deze inrichting is verbonden 10 met een niet nader weergegeven regelorgaan, welke de de hete wig verhittende inductiewinding 6 regelt.To control the temperature of the hot wedge 5, a temperature sensing device 8 is arranged in the hot wedge as close as possible to the pointed end 9 thereof. This device is connected to a control element (not shown in more detail) which controls the induction winding 6 heating the hot wedge.

In het tweede uitvoeringsvoorbeeld van de uitvinding zoals weergegeven in fig, 2 worden twee vellen uit thermoplastisch materiaal op dezelfde wijze aan elkaar gehecht als hierboven is omschreven waarbij echter 15 in dit geval een ander type hete wig wordt gebruikt. De hete wig 10 volgens dit uitvoeringsvoorbeeld omvat een mantel 11 uit een geschikt weerstands-materiaal. De mantel 11 is bij zijn einden 12 en 13 verbonden met elec-trische leidingen 15. Een stroom van hoge amperage en laag voltage wordt aan de hete wig toegevoerd via de leidingen 15 waardoor de hete wig tot 20 op een geschikte temperatuur zal worden verhit.In the second exemplary embodiment of the invention as shown in Fig. 2, two sheets of thermoplastic material are bonded together in the same manner as described above, but in this case a different type of hot wedge is used. The hot wedge 10 according to this exemplary embodiment comprises a jacket 11 of a suitable resistance material. The jacket 11 is connected at its ends 12 and 13 to electrical lines 15. A high amperage and low voltage current is supplied to the hot wedge through the lines 15 whereby the hot wedge will be heated to 20 at a suitable temperature.

Evenals in het voorgaande uitvoeringsvoorbeeld is een tempera-tuurwaarneeminrichting 16 opgesteld nabij de punt 17 van de wig. Deze inrichting 16 regelt op op zichzelf bekende wijze de stroom, welke door de wig vloeit en op deze wijze wordt de temperatuur van de wig geregeld.As in the previous embodiment, a temperature sensing device 16 is disposed near the tip 17 of the wedge. This device 16 controls the current flowing through the wedge in a manner known per se and in this way the temperature of the wedge is controlled.

25 In beide bovenomschreven uitvoeringsvoorbeelden kan een kleine hoeveelheid aanvullend gesmolten thermoplastisch materiaal worden ingébracht tussen de oppervlakken 1 en 2 nadat deze oppervlakken zijn gesmolten door de wig, maar voordat deze oppervlakken tegen elkaar worden geknepen door de rol 7. Dit materiaal kan worden ingebracht via een mondstuk 18, 30 dat is gelegen nabij de punt of de achterlopende rand 19 van een wig 20, zoals afgebeeld in fig. 3.In both embodiments described above, a small amount of additional molten thermoplastic material can be introduced between surfaces 1 and 2 after these surfaces have been melted by the wedge, but before these surfaces are pinched together by the roller 7. This material can be introduced via a nozzle 18, 30 located near the tip or trailing edge 19 of a wedge 20, as shown in Fig. 3.

Indien de rol de twee vellen uit thermoplastisch materiaal samenknijpt worden de gesmolten oppervlakken 1 en 2 daarvan op de boven beschreven wijze met elkaar in contact gebracht. Het aanvullende gesmolten thermo-35 plastisch metariaal verzamelt zich in eventuele holtes of plooien waar de twee oppervlakken niet aan elkaar zijn gelast waardoor een continuïteit en volledigheid van de las wordt gewaarborgd.When the roller squeezes the two sheets of thermoplastic material, the molten surfaces 1 and 2 thereof are brought into contact with each other as described above. The additional molten thermoplastic metal material collects in any voids or folds where the two surfaces are not welded together, ensuring continuity and completeness of the weld.

Een oorzaak van dergelijke plooien, welke tot lekken in de ver- 8103851 -5- 22037/CV/mv binding kan leiden, is af gebeeld in fig. 3. Indien de twee vellen onder de rol 7 bewegen gebeurt het vaak, dat een kleine golf van het materiaal zich opbouwt in een van de vellen voor de rol 7. Deze golven kunnen zo nu en dan onder de rol door bewegen in de vorm van een plooi 21. Het aan-5 vullende materiaal 22 verzamelt zich nu in een dergelijke plooi en dicht deze plooi op de bovenomschreven wijze af.A cause of such folds, which can lead to leakage in the connection 8103851 -5- 22037 / CV / mv bond, is shown in fig. 3. When the two sheets move under the roll 7 it often happens that a small wave of the material builds up in one of the sheets for the roll 7. These waves may occasionally move under the roll in the form of a pleat 21. The additional material 22 now collects in such a pleat and seal this fold in the manner described above.

Een alternatief op dit uitvoeringsvoorbeeld is weergegeven in fig. 4. In plaats van het aanvullende thermoplastische materiaal hier in te brengen op een plaats tussen de punt van de wig en de rol wordt het 10 ingebracht aan de zijkant van deze twee inrichtingen. Indien de rol de oppervlakken tegen elkaar knijpt verzamelt dit aanvullende thermoplastische materiaal zich in de vorm van een straal 23 naast de gelaste oppervlakken waardoor eventuele lekken of holtes, die eventueel aanwezig zouden kunnen zijn, zullen worden af gedicht. Opgemerkt wordt hier, dat de warmte 15 van het aanvullende gesmolten· materiaal de oppervlakken van de vellen smelt waardoor een soortgelijk lasmechanisme tot stand wordt gebracht.An alternative to this exemplary embodiment is shown in Fig. 4. Instead of introducing the additional thermoplastic material here at a location between the tip of the wedge and the roller, it is introduced at the side of these two devices. When the roller squeezes the surfaces together, this additional thermoplastic material collects in the form of a jet 23 adjacent to the welded surfaces, thereby sealing any leaks or voids that may be present. It is noted here that the heat of the additional molten material melts the surfaces of the sheets, thereby establishing a similar sealing mechanism.

Uit boven beschreven uitvoeringsvoorbeelden zal het duidelijk zijn, dat de uitvinding voorziet in een nieuwe werkwijze voor het aan elkaar lassen van de overlappende randen van vellen thermoplastisch mate* 20 riaal. Daarbij wordt dit lassen op een efficiënte vrije wijze uitgevoerd onder gebruik making van hete wiggen waarvan de temperatuur gemakkelijk en verhoudingsgewijs nauwkeurig kan worden geregeld.It will be apparent from the above described embodiments that the invention provides a new method for welding the overlapping edges of sheets of thermoplastic material together. In addition, this welding is efficiently performed using hot wedges whose temperature can be easily and relatively accurately controlled.

Binnen de geest en beschermingsomvang van de uitvinding zullen andere uitvoeringsvormen dan de beschreven uitvoeringsvormen mogelijk 25 zijn.Within the spirit and scope of the invention, embodiments other than the described embodiments will be possible.

-CONCLUSIES- 8103851- CONCLUSIONS - 8103851

Claims (7)

1. Werkwijze voor het aan elkaar lassen van vellen thermoplastisch materiaal, waarbij de werkwijze omvat: 5 (i) het zodanig opstellen van de twee te lassen vellen, dat zij althans nagenoeg nabij elkaar zijn gelegen met een paar van hun randen in een overlappende Verhouding; (ii) het bewegen van een hete wig tussen de overlappende randen teneinde de naburige oppervlakken van beide vellen daarmede in contact 10 te brengen, waarbij de wig is op een temperatuur, welke hoog genoeg is voor het smelten van beide oppervlakken; (iii) het toevoegen van een hoeveelheid gesmolten thermoplastisch materiaal tussen de overlappende randen, en (iv) het tegen elkaar drukken van de overlappende randen waarop 15 deze wordt toegestaan af te koelen, zodat de oppervlakken althans nagenoeg volledig aan elkaar worden gehecht door het thermoplastische materiaal van de vellen en eventuele holtes en vouwen door de aanvullende hoeveelheid thermoplastisch materiaal worden gevuld.A method for welding sheets of thermoplastic material together, the method comprising: (i) arranging the two sheets to be welded so that they are at least substantially adjacent to each other with a pair of their edges in an overlapping ratio ; (ii) moving a hot wedge between the overlapping edges to contact the adjacent surfaces of both sheets therewith, the wedge being at a temperature high enough to melt both surfaces; (iii) adding an amount of molten thermoplastic material between the overlapping edges, and (iv) pressing the overlapping edges together to allow it to cool, so that the surfaces are at least substantially adhered together by the thermoplastic material of the sheets and any voids and folds are filled by the additional amount of thermoplastic material. 2. Werkwijze volgens conclusie 1, met het kenmerk, dat het aan-20 vullende thermoplastische materiaal wordt toegevoegd tussen de overlap- pende randen op een plaats welke althans nagenoeg nabij dat deel van de oppervlakken is gelegen, welke door de hete wig worden gesmolten.2. A method according to claim 1, characterized in that the additional thermoplastic material is added between the overlapping edges at a location at least substantially near that part of the surfaces which are melted by the hot wedge. 3. Hete wig bestemd voor gebruik bij het lassen van de overlappende randen van thermoplastische vellen voorzien van'een wig uit geschikt ma- 25 teriaal en middelen voor het verhitten van de wig in de vorm van een regelbare inductiewinding of dergelijke.3. Hot wedge intended for use in welding the overlapping edges of thermoplastic sheets provided with a wedge of suitable material and means for heating the wedge in the form of an adjustable induction coil or the like. 4. Hete wig voor gebruik bij het lassen van de overlappende randen van thermoplastische vellen voorzien van een wig uit geschikt materiaal en weerstandsverwarmingsorganen voor de wig voorzien van middelen voor 30 het doorvoeren van een stroom met hoog amperage en laag voltage door de wig.4. Hot wedge for use in welding the overlapping edges of thermoplastic sheets provided with a wedge of suitable material and wedge resistance heaters provided with means for passing a high amperage and low voltage current through the wedge. 5. Inrichting voorzien van een hete wig volgens conclusie 3 of 4. met het kenmerk, dat de inrichting is voorzien van middelen voor het inbrengen van aanvullend gesmolten kunststof materiaal tussen de overlappende randen na doorvoer van de hete wig en van middelen voor het tegen 35 elkaar drukken van de overlappende randen na het inbrengen van het gesmolten kunststof materiaal.5. Device provided with a hot wedge according to claim 3 or 4, characterized in that the device is provided with means for introducing additional molten plastic material between the overlapping edges after passage of the hot wedge and with means for counteracting pressing the overlapping edges together after insertion of the molten plastic material. 6. Werkwijze althans nagenoeg zoals hierboven is omschreven en/of is afgebeeld in bijgaande figuren. 8103851 cT -7- 22037/CV/mv6. Method at least substantially as described above and / or shown in the accompanying figures. 8103851 cT -7- 22037 / CV / pl 7. Inrichting althans nagenoeg zoals hierboven is omschreven en/of is af geheeld in bijgaande figuren. Eindhoven, augustus 1981. 81Q 3 8 d i7. Device at least substantially as described above and / or shown in the accompanying figures. Eindhoven, August 1981. 81Q 3 8 d i
NL8103851A 1980-08-22 1981-08-18 METHOD FOR WELDING SHEETS OR PLATES FROM THERMOPLASTIC MATERIAL AND APPARATUS FOR CARRYING OUT THIS METHOD NL8103851A (en)

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GB2082500A (en) 1982-03-10
IT8123596A0 (en) 1981-08-21
BR8105241A (en) 1982-04-27
IT1138164B (en) 1986-09-17
DE3132273A1 (en) 1982-04-01
AU7315781A (en) 1982-02-25
FR2488828A1 (en) 1982-02-26
IL63415A0 (en) 1981-10-30

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