DE1229277B - Thermal contact welding device for welding layers of thermoplastic materials lying on top of one another, in particular for welding plastic lids onto the bottle edge of plastic cans - Google Patents

Thermal contact welding device for welding layers of thermoplastic materials lying on top of one another, in particular for welding plastic lids onto the bottle edge of plastic cans

Info

Publication number
DE1229277B
DE1229277B DEF30955A DEF0030955A DE1229277B DE 1229277 B DE1229277 B DE 1229277B DE F30955 A DEF30955 A DE F30955A DE F0030955 A DEF0030955 A DE F0030955A DE 1229277 B DE1229277 B DE 1229277B
Authority
DE
Germany
Prior art keywords
welding
plastic
thermal contact
clamping plate
cover plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DEF30955A
Other languages
German (de)
Inventor
Heinz Oelze
Franz Hartleib
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
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 to IT649918D priority Critical patent/IT649918A/it
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to DEF30955A priority patent/DE1229277B/en
Priority to GB12663/61A priority patent/GB958602A/en
Priority to SE3685/61A priority patent/SE303860B/xx
Priority to FR858301A priority patent/FR1287730A/en
Publication of DE1229277B publication Critical patent/DE1229277B/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B7/00—Closing containers or receptacles after filling
    • B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
    • B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
    • B65B7/2842—Securing closures on containers
    • B65B7/2878—Securing closures on containers by heat-sealing
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • 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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow 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
    • B29C66/50—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
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—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
    • B29C66/814—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
    • B29C66/81457—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
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of 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
    • B29C66/80—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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of 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
    • B29C66/80—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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81875—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/71—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 composition of the plastics material 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
    • B29C66/91—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

Landscapes

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

Description

Wärmekontakt-Schweißvorrichtung zum Verschweißen von aufeinanderliegenden Schichten aus thermoplastischen Kunststoffen, insbesondere zum Aufschweißen von Kunststoffdeckeln auf den Flaschenrand von Kunststoffdosen Zum Verschweißen von Kunststoffolien aus Polyvinylchlorid, Polyäthylen, Polypropylen usw. stehen grundsätzlich die Arbeitsmethoden mit Wärmekontakt, mit Wärmeimpuls und mit Hochfrequenz zur Verfügung.Thermal contact welding device for welding superimposed Layers of thermoplastics, in particular for welding on Plastic lids on the bottle edge of plastic cans For welding Plastic films made of polyvinyl chloride, polyethylene, polypropylene, etc. are generally available the working methods with thermal contact, with thermal impulse and with high frequency are available.

Die Hochfrequenzmethode ist nur für Kunststoffe mit bestimmtem Verlustwinkel, also z. B. für Hartfolien aus Polyvinylchlond und Polyamidfolien, nicht aber für Folien aus Polyolefinen anwendbar. Außerdem stellen die hierzu benötigten HF-Generatoren kostspielige und schwierig einzuregulierende Apparaturen dar. Beim Wärmeimpulsverfahren wird das Schweißelement, beispielsweise ein Band aus Nickelkonstantan, mittels eines kurzen Stromimpulses auf die für das Schweißen benötigte Temperatur gebracht. The high frequency method is only for plastics with a certain loss angle, so z. B. for rigid films made of polyvinyl chloride and polyamide films, but not for Films made from polyolefins can be used. The HF generators required for this are also provided expensive and difficult to regulate equipment the welding element, for example a band made of nickel constantan, by means of a short current pulse brought to the temperature required for welding.

Mit der Unterbrechung des Impulses kühlt das Band sofort wieder ab. Dies wäre an sich günstig für die wünschenswerte Abkühlung unter Druck, aber leider stehen noch keine in der Praxis sicher arbeitenden Formelektroden auf Wärmeimpulsbasis zur Verfügung. Die Bänder sind äußerst empfindlich, und nach kurzer Gebrauchsdauer tritt eine starke Erwärmung ein, so daß die Wärmeimpulsschweißung mehr den Charakter einer Wärmekontaktschweißung annimmt.When the pulse is interrupted, the belt immediately cools down again. This would in itself be beneficial for the desirable cooling under pressure, but unfortunately There are not yet any form electrodes that work reliably in practice on the basis of heat pulses to disposal. The tapes are extremely delicate, and after a short period of use a strong heating occurs, so that the thermal impulse welding more the character a thermal contact weld.

Beim Wärmekontaktschweißen werden die Schweißelemente dauernd beheizt, wobei die Temperatur der Backen über einen Thermostaten geregelt werden muß. Die Einhaltung einer über längere Zeit konstanten Backentemperatur ist dabei sehr schwierig, obwohl sie bei dem relativ engen, für die thermoplastische Verarbeitung zur Verfügung stehenden Temperaturbereich von ausschlaggebender Bedeutung ist. Wenn nicht unter Druck abgekühlt wird, schrumpft die Folie nach dem Entlasten des Wärmekontaktstempels infolge der reversiblen Eigenschaften, z. B. des Polyvinylchlorids, zusammen, und es entsteht eine unansehnliche Schweißnaht. Beim Öffnen der Schweißbacken kleben die verschweißten Folien häufig an ihnen fest. Die hiergegen vorgeschlagenen Abdekkungsschichten, z. B. aus Tetrafluoräthylen, nehmen nach kurzer Zeit auch eine hohe Temperatur an, und die Schweißnähte neigen wieder zum Welligwerden.With thermal contact welding, the welding elements are continuously heated, whereby the temperature of the jaws must be regulated by a thermostat. the Maintaining a constant baking temperature over a longer period of time is very difficult, although they are at the relatively narrow, available for thermoplastic processing temperature range is of crucial importance. If not under Pressure is cooled, the film shrinks after releasing the thermal contact stamp due to the reversible properties, e.g. B. of polyvinyl chloride, together, and an unsightly weld seam is created. Stick when opening the welding jaws the welded foils often stuck to them. The covering layers proposed against this, z. B. from tetrafluoroethylene, also take on a high temperature after a short time, and the weld seams tend to become wavy again.

Es besteht demnach ein dringendes Bedürfnis für eine einwandfrei und betriebssicher arbeitende Wärmekontakt-Schweißvorrichtung, und eine solche nachstehend beschriebene Vorrichtung ist Gegenstand der Erfindung. There is therefore an urgent need for an impeccable one and reliable thermal contact welding device, and such below The device described is the subject of the invention.

Gegenstand der Erfindung ist eine Wännekontakt-Schweißvorrichtung zum Verschweißen von aufeinanderliegenden Schichten aus thermoplastischen Kunststoffen, insbesondere zum Aufschweißen von Kunststoffdeckeln auf den Flanschenrand von mit Füllgut befüllten Kunststoffdosen, gekennzeichnet durch eine vertikal verschiebbar gelagerte Einspannplatte, in welche ein membranartiges metallisches Schweißelement eingespannt ist und welche die das Schweißelement beaufschlagenden Heizelemente trägt, ein ringförmiges hohles Anpreß- und Kühlorgan mit Kühlwasserzuleitung und Kühlwasserableitung, welches koaxial zur Einspannplatte vertikal derart verschiebbar ist, daß es mit seiner Unterkante in Berührung mit den frei tragenden Flächenteilen des Heizelements tritt, und ein senkrecht unterhalb des bisherigen Vorrichtungsteils angeordnetes Gegenlager, welches die zu verschweißenden Kunststoffflächen trägt. The invention relates to a thermal contact welding device for welding layers of thermoplastic materials on top of one another, especially for welding plastic covers onto the flange edge of with Filled plastic cans, characterized by a vertically displaceable mounted clamping plate in which a membrane-like metallic welding element is clamped and which the heating elements acting on the welding element carries, an annular hollow pressing and cooling element with cooling water supply and Cooling water discharge, which can be displaced vertically in such a way coaxially to the clamping plate is that its lower edge is in contact with the cantilevered surface parts of the heating element occurs, and one vertically below the previous device part arranged counter bearing, which carries the plastic surfaces to be welded.

Als Schweißelement wird in einer bevorzugten Ausführungsform ein kalt aus einer Kupferscheibe gedrückte Membran hoher statischer Festigkeit verwendet. In a preferred embodiment, a Used cold-pressed membrane with high static strength from a copper washer.

Das Kühlelement wird zweckmäßig von einer Abdeckplatte gehalten, während die Einspannplatte von durch Bohrungen der Abdeckplatte hindurchgehenden senkrechten Schraubbolzen mit Führungs- und Verstellbuchsen und Stellringen getragen wird. The cooling element is expediently held by a cover plate, while the clamping plate of passing through holes in the cover plate vertical screw bolts carried with guide and adjusting bushings and adjusting rings will.

In der Mittelachse der Einspannplatte und der Abdeckplatte kann vertikal verschiebbar ein an sich be--kannter Führungsstempel mit Niederhalter angeordnet werden. In the central axis of the clamping plate and the cover plate can be vertical a known guide punch with hold-down device can be displaced will.

In »Maschinenmarkt«, 1956, S. 12, ist für die Wärmeimpulsschweißung als stromführender Teil ein gut leitendes Metallband beschrieben, das durch einen hindurchgeleiteten Stromkreis erhitzt wird und nach Abschalten des Zeitrelais unter Druck abkühlen kann. Hier ist das Metallband Bestandteil eines elektrischen Stromkreises. Bei der Wärmekontakt-Schweißvorrichtung der vorliegenden Erfindung steht die Metallmembran nicht unter Strom und ist nicht in einen elektrischen Stromkreis eingeschaltet. Vielmehr nimmt hier die Metallmembran die zum Verschweißen erforderliche Wärmemenge von einer entsprechend dimensionierten Wärmequelle ab, über trägt sie auf mit ihr in Berührung gebrachte Kunststoffffächen und wird anschließend durch ein wassergekühltes Anpreßorgan wieder abgekühlt. In "Maschinenmarkt", 1956, p. 12, is for thermal impulse welding described as a current-carrying part a highly conductive metal strip, which is through a circuit passed through is heated and after switching off the Time relay can cool down under pressure. Here the metal band is part of one electrical circuit. In the thermal contact welding apparatus of the present Invention, the metal diaphragm is not energized and is not in an electrical one Circuit switched on. Rather, here the metal membrane takes the one for welding required amount of heat from an appropriately dimensioned heat source, it carries over it to plastic surfaces brought into contact with it and is then cooled again by a water-cooled pressure element.

Der gleiche grundsätzliche Unterschied besteht gegenüber der Vorrichtung der USA.-Patentschrift 2 574 095, bei der ebenfalls das Schweißwerkzeug in einen elektrischen Stromkreis eingeschaltet isft Demgegenüber hat dieVarmekontakt-Schweißvorrichtung der Erfindung den Vorteil des Abkühlens unter Anpreßdruck und der Entbehrlichkeit von Abdeckschichten aus Polytetrafluoräthylen od. dgl. auf den Elektroden, wie sie beispielsweise für die Vorrichtung der erwähnten USA.-P.atentschrift vorgesehen werden muß. The same fundamental difference exists with respect to the device US Pat. No. 2,574,095, in which the welding tool is also integrated into a On the other hand, the arm contact welding device the invention has the advantage of cooling under contact pressure and dispensability of cover layers made of polytetrafluoroethylene od. Like. On the electrodes, as they for example provided for the device of the above-mentioned United States patent must become.

Aus der deutschen P.atentanmeldungL 1756 XI/39a ist ein Verfahren zum Verschweißen von Kunststofffolienbahnen bekannt, bei dem die Erwärmung der zu vereinigenden Kunststoffschichten durch einen oder mehrere Wärmeimpulse mit Hilfe eines oder mehrerer, vorzugsweise stromdurchfiossener Teile geringer Wärmekapazität, beispielsweise einer als Heizband dienenden eingelegten Metallfolie, erfolgt. In der allgemeinsten Form wird zu diesem Zweck mit einer Vorrichtung gearbeitet, bei der zwei aus wärmeleitendem Material bestehende, heiz- und kühlbare Preßplatten zwischen sich ein oder zwei Heizbänder und zwei zu verschweißende Kunststoffschichten einschließen. Das Heizband liegt dabei dort, wo es mit den zu verschwei:ßenden Folienflächen in Beriihrung kommt, mit seiner ganzen rückwertigen Fläche auf einer Druckplatte auf. Im Gegen--satz hierzu ist das membranartige Schweiß organ der Vorrichtung der vorliegenden Erfindung dort, wo es mit den zu verschweißenden Folienfiächen in Beruhrung tritt, frei tragend und nicht auf der anderen Seite mit irgendeiner anderen Fläche verbunden. From the German patent application L 1756 XI / 39a is a method known for welding plastic film webs, in which the heating of the to unifying plastic layers by means of one or more heat impulses one or more parts of low heat capacity, preferably through which current flows, for example, an inserted metal foil serving as a heating tape takes place. In the most general form is worked with a device for this purpose the two heatable and coolable press plates made of thermally conductive material between them one or two heating strips and two plastic layers to be welded lock in. The heating tape is where it connects to the foil surfaces to be welded comes into contact with its entire rear surface on a pressure plate on. In contrast to this, the membrane-like sweat organ of the device is the present invention where it comes into contact with the foil surfaces to be welded steps, cantilevered and not on the other side with any other surface tied together.

Von keiner der genannten Vorveröffentlichungen konnte der Fachmann zu der sehr speziellen Vorrichtungfder-vorliegenitien Erfindung geführt werden. The person skilled in the art could not from any of the prior publications mentioned be led to the very special device-present invention.

Die als Schweißelement dienende Membran kann verhältnismäßig dünn, z. B. in Kupfer 0,1 bis 0,4 mm, je nach der Dicke der zu verschweißenden Folien gestaltet werden, weil sie lediglich die Wärmemenge von der Heizquelle aufzunehmen und an die Folie weiterzuleiten hat, was bei dieser Materialstärke innerhalb von Sekunden oder Sekundenbruchteilen -geschieht. Das anschließend sich auf die Oberseite der Wärmeimpulsmembran herabsenkende gekühlte Anpreßorgan entzieht unverzüglich der Schweißnaht die Wärme und drückt gleichzeitig das Schweißelement in den Kunststoff hinein, so daß die Schweißnaht unter Druck abgekühlt wird und deshalb formbeständig ausfällt. The membrane used as a welding element can be relatively thin, z. B. in copper 0.1 to 0.4 mm, depending on the thickness of the foils to be welded be designed because they only absorb the amount of heat from the heat source and has to pass on to the foil what is within this material thickness Seconds or fractions of a second - happens. That then spreads out on top the cooled pressure element, which is lowering the heat pulse membrane, immediately withdraws The weld seam absorbs the heat and at the same time pushes the welding element into the plastic into it, so that the weld seam is cooled under pressure and is therefore dimensionally stable fails.

Das membranartige Schweißorgan kann in jeder für die Schweißnaht gewählten Form, also beispielsweise linear, geometrisch gleichmäßig oder ganz unregelmäßig gestaltet werden. Es kann durch auf einem Träger angeordnete Heizelemente oder durch einen Stromimpulsgeber auf die erforderliche Temperatulr aufgeheizt werden, die je nach Folientyp etwa 150 bis 2500 C betragen kam. Vorteilhaft kann dem membranartigen Schweißorgan 6 eine größere statische Festigkeit verliehen werden, indem man es beispielsweise aus einer runden Kupferscheibe kalt drückt. The membrane-like welding organ can be used in any for the weld seam selected shape, for example linear, geometrically uniform or completely irregular be designed. It can be through heating elements arranged on a carrier or through a current pulse generator to the required temperature be heated that ever depending on the type of film, the temperature was between 150 and 2500 C. The membrane-like Welding organ 6 a greater static strength can be imparted by it for example cold presses from a round copper disk.

In den Zeichnungen ist eine beispielsweise Ausführungsform des Gerätes der Erfindung dargestellt, welche für den Spezialfall des Aufschweißens eines geilanschten Kunststoffdeckels auf den umgebogenen Flanschenrand eines tiefgezogenen Kunststoffbechers ausgestaltet ist, der beispielsweise zur Verpackung von Fischmarinaden, Marmeladen u. dgl. dient. In the drawings is an exemplary embodiment of the device the invention shown, which for the special case of welding a geilanschten Plastic lid on the bent flange edge of a deep-drawn plastic cup is designed, for example, for packaging fish marinades, jams and the like.

Fig. 1 zeigt den Oberteil des Gerätes vor der Schweißoperation, F i g. 2 und 4 den Unterteil des Gerätes, in dessen Hohlraum der zu verschließende Kunststoffbecher 19 eingesetzt und mit dem aufzuschweißenden, nach innen und abwärts gekröpften Kunststoffdeckel 20 bedeckt ist. Fig. 1 shows the upper part of the device before the welding operation, F i g. 2 and 4 the lower part of the device, in its cavity the one to be closed Plastic cup 19 inserted and with the welded on, inward and downward cranked plastic lid 20 is covered.

Der Unterteil des Gerätes besteht im wesentlichen nur aus der den tiefgezogenen Becher aufnehmenden Hohlform 17 und einer sich auf seiner oberen waagerechten Fläche im Bereich der Schweißzone ßrstrekkenden, wärmeisolierenden, ringförmigen Unterlage 18 aus .unelastischem oder elastischem Stoff, z.B. The lower part of the device consists essentially only of the deep-drawn cup receiving hollow shape 17 and one on its upper horizontal Area in the area of the welding zone ßrstrstrkende, heat-insulating, ring-shaped Base 18 made of inelastic or elastic material, e.g.

Silikongummi.Silicone rubber.

Am Oberteil des Gerätes sind konzentrisch angeordnet: ein senkrecht verschiebbarer Führungsstempel 2, mit dem der Niederhalter 1 für den Dosendeckel fest verbunden ist, eine auf dem Führungsstempel 2 verschiebbare Einspannplatte 5 für das als Kupfermembran 6 gestaltete Schweißorgan und zum Tragen der in der Zeichnung nicht dargestellten Heiz-.elemente, ein ringförmiges, hohlesAnpreß- und Kühlorgan 11 mit Kühlwasserzuleitung 12 und Kühlwasser-.ableitung 13 und eine Abdeckplatte 15. Schrauben--bolzen 7 dienen zum Halten der Aufnahmeplatte, die einerseits die Heizkörper trägt und in die andererseits das Schweißelement -6-eingespannt ist. Die Bolzen 7 sind innerhalb von Führungs- und Verstellbüchsen 8 angeordnet, mittels deren das Schweißelement 6 in der Höhe verstellbar ist. Koaxial um die Stopfbüchsein 8 sind Stellringe 9 angeordnet, mittels deren der lichte senkrechte Abstand zwischen der Unterseite des Anpreß- und Kühlorgans 11 und der Oberseite des Schweißorgans 6 verändert werden kann. Die .Größe dieses Abstandes und damit die Wegzeit, welche das Anpreß- und Kühlelement von seiner obersten Stellung bis zur Berührung des Schweißelements 6 -benötigt, bestimmt die jeweilige Schweißzeit. Bei 4 ist eine Gegendruckf eder für den Niederhalter .angedeutet, während die Druckfedern 10 die Druckkraft für die Einspannplatte 5 und damit für das Schweiß element 6 liefern. 16 sind Stehbolzen, die zur Auinaime des Schweißwerkzeuges in die übliche Schweißpresse dienen. On the upper part of the device are arranged concentrically: one perpendicular displaceable guide punch 2 with which the hold-down device 1 for the can lid is firmly connected, a on the guide punch 2 displaceable clamping plate 5 for the welding organ designed as a copper membrane 6 and for wearing the in the Drawing not shown heating elements, an annular, hollow pressing and Cooling element 11 with cooling water supply line 12 and cooling water discharge line 13 and a cover plate 15. Screw bolts 7 are used to hold the mounting plate, on the one hand the Carries radiator and in which the other hand the welding element -6- is clamped. The bolts 7 are arranged within guide and adjusting sleeves 8, by means of the welding element 6 of which is adjustable in height. Be coaxial around the stuffing box 8 adjusting rings 9 are arranged, by means of which the clear vertical distance between the underside of the pressing and cooling member 11 and the top of the welding member 6 can be changed. The .size of this distance and thus the travel time, which the pressing and cooling element from its uppermost position until it touches the welding element 6 -required, determines the respective welding time. At 4 there is a counter pressure spring for the hold-down. indicated, while the compression springs 10 the compressive force for the clamping plate 5 and thus supply element 6 for the welding. 16 are stud bolts, which are used to insert the welding tool into the usual welding press.

Innerhalb der Führungsplatte 5 kann eine als entgegengesetzt schraffierter Streifen dargestellte Glimmerscheibe angeordnet sein, die aber bei Anlegen eines Stromimpulses an das Schweißelement 6 nicht erforderlich ist. Within the guide plate 5, one can be hatched in the opposite direction Strip shown mica disk be arranged, but when you create a Current pulse to the welding element 6 is not required.

In F i g. 3 ist die Vorrichtung in dem Augenblick gezeigt, wo nach erfolgter Wärmeimpulsabgabe an das Schweißelement 6 die Schweißung stattgefunden hat und nunmehr das herabgeführte Anpreß- und Kühlorgan 11 das Schweiß element 6 gegen die SSchwéißnaht preßt und gleichzeitig kühlt, so daß die hergestellte Schweißnaht unter Druck abgekühlt und dadurch formbeständig gemacht wird. In Fig. 3 the device is shown at the moment after Once the heat pulse has been emitted to the welding element 6, the welding has taken place has and now the downward pressure and cooling element 11, the welding element 6 presses against the weld seam and cools at the same time, so that the manufactured The weld seam is cooled under pressure and thereby made dimensionally stable.

Die Relativ-Beweglichkeit der einzelnen Teile im und außer Eingriff ist durch die eingezeichneten Doppelpfeile angedeutet. Beim Schließen der Dose setzt der Niederhalter 1 auf den Kunststoffdeckel 20 auf. Bei der weiteren vertikalen Aufwärtsbewegung wird durch Vermittlung von Schraubenbolzen 7 und Einspannplatte 5 das Schweißorgan 6 auf den zu verschweißenden Rand des Dosendeckels aufgesetzt und gibt die ihm von den Heizelementen zufließende Wärmemenge an diese Zone des zu verschweißenden Dosendeckels ab, welche sich nunmehr entsprechend erwärmt. In der nächsten Bewegungsphase wird durch Vermittlung der Abdeckplatte 15 das Anpreß- und Kühlelement 11 auf das Schweißelement 6 herabgedrückt, das dadurch auf die erwärmte Randzone von Kunststoffdeckel und Dosenflansch einen mechanischen Druck ausübt, durch welchen die Verschweißung zustande gebracht wird. Dadurch wird sowohl das dünne Schweiß element 6 wie die Schweißnahtfläche abgekühlt. The relative mobility of the individual parts in and out of engagement is indicated by the double arrows shown. When closing the can sets the hold-down device 1 on the plastic cover 20. With the further vertical Upward movement is achieved by means of screw bolts 7 and clamping plate 5 the welding member 6 is placed on the edge of the can lid to be welded and gives the amount of heat flowing to it from the heating elements to this zone of the to be welded from the can lid, which is now heated accordingly. In the next movement phase is through the mediation of the cover plate 15, the pressing and cooling element 11 pressed down on the welding element 6, which is thereby heated to the The edge zone of the plastic lid and the can flange exerts mechanical pressure, through which the weld is brought about. This will do both the thin welding element 6 cooled as the weld seam surface.

Nach einer ausreichenden Dauer des Abkühl- und Schweißvorganges, die von Art und Dicke der zu verschweißenden Kunststofflagen bestimmt wird, wird zunächst das Anpreß- und Kühlorgan 11, anschließend das Schweißelement 6 und schließlich der Niederhalter 1 senkrecht nach oben abgehoben, so daß die nunmehr mit dem Deckel verschweißte Dose frei wird und aus dem Unterteil 17 der Vorrichtung (Fig. 4) herausgehoben werden kann. After a sufficient duration of the cooling and welding process, which is determined by the type and thickness of the plastic layers to be welded first the pressing and cooling element 11, then the welding element 6 and finally the hold-down device 1 lifted vertically upwards, so that the now with the lid welded box is free and lifted out of the lower part 17 of the device (Fig. 4) can be.

Sobald das Anpreß- und Kühlelement 11 von dem dünnen Schweißelement 6 wieder abgehoben ist, läßt sich letzteres innerhalb weniger Sekunden wieder aufheizen. As soon as the pressing and cooling element 11 of the thin welding element 6 is lifted again, the latter can be heated up again within a few seconds.

Selbstverständlich ist es möglich, die Temperatur des Schweiß elements 6 mittels eines schnell reagierenden Thermostaten zu regeln. Of course, it is possible to adjust the temperature of the welding element 6 by means of a fast-reacting thermostat.

Stellt man die Einspannplatte 5 aus einem isolierenden Werkstoff her, so kann das Schweißwerkzeug 6, das dann allerdings aus einem entsprechend leitendem Werkstoff bestehen muß, bei geöffnetem Werkzeug über einen Impulsregler mittels Stromimpuls beheizt werden. If the clamping plate 5 is made of an insulating material forth, so the welding tool 6, which then, however, consists of a correspondingly conductive Material must exist, with the tool open via a pulse regulator using Current pulse are heated.

Während die oben beschriebene Ausführungsform für das Aufschweißen von Deckeln auf KunststoE-dosen bestimmt und deshalb mit einem ringförmigen Schweißorgan und einem entsprechend ringförmig gestalteten Anpreß- und Kühlorgan ausgestattet ist, können nach dem gleichen Prinzip arbeitende Vorrichtungen selbstverständlich auch mit nicht in sich zurücklaufenden Schweiß- und Anpreßorganen für andere Zwecke, insbesondere an Abpackmaschinen für Kunststoffbeutel und Schlauch-Einzelpackungen, benutzt werden, für die dauernd beheizte Schweißbacken wünschenswert sind, aber bisher in konti- nuierlicher Arbeitsweise noch nicht befriedigend und wirtschaftlich betrieben werden konnten. Gedacht ist z. B. an Aggregate zum Verschweißen von durch hydrophobe Beschichtung wetterfest gemachten Cellulosehydratfolien oder von mit Polymeren beschichteten Zellglasfolien. Dabei werden zweckmäßig dem Kühlorgan 11 noch dünne, leitfähige Schweißmembranen vorgeschaltet. While the embodiment described above for welding determined by lids on plastic cans and therefore with a ring-shaped sweat organ and a correspondingly ring-shaped pressing and cooling element , devices working according to the same principle can of course be used also with welding and pressure elements that do not retract in themselves for other purposes, especially on packaging machines for plastic bags and single tube packs, can be used for which continuously heated welding jaws are desirable, but so far in continuous natural way of working is not yet satisfactory and economical could be operated. Thought is z. B. on units for welding by hydrophobic coating made of weatherproof cellulose hydrate films or with Polymer-coated cellulose film. The cooling element 11 still thin, conductive welding membranes connected upstream.

Claims (4)

Patentansprüche: 1. Wärmekontakt-Schweißvorrichtung zum Verschweißen von aufeinanderliegenden Schichten aus thermoplastischen Kunststoffen, insbesondere zum Aufschweißen von Kunststoffdeckeln auf den Flanschenrand von Kunststoffdosen, g e -kennzeichnet durch eine vertikal verschiebbar gelagerte Einspannplatte (5), in welche ein membranartiges metallisches Schweißelement (6) eingespannt ist und welche die das Schweißelement beaufschlagenden Heizelemente trägt, ein ringförmiges hohles Anpreß- und Kühlorgan (11) mit Kühlwasserzuleitung (12) und Kühlwasserableitung (13), welches koaxial zur Einspannplatte (5) vertikal derart verschiebbar ist, daß es mit seiner Unterkante in Berührung mit den frei tragenden Flächenteilen des Heizelements (6) tritt, und ein senkrecht unterhalb des bisherigen Vorrichtungsteils angeordnetes Gegenlager (17, 18), welches die zu verschweißenden Kunststoffflächen trägt. Claims: 1. Thermal contact welding device for welding of superimposed layers of thermoplastics, in particular for welding plastic lids onto the flange edge of plastic cans, g e - characterized by a vertically displaceable mounting plate (5), in which a membrane-like metallic welding element (6) is clamped and which carries the heating elements acting on the welding element, an annular one hollow contact pressure and cooling element (11) with cooling water supply line (12) and cooling water drainage (13), which is vertically displaceable coaxially to the clamping plate (5) in such a way that its lower edge in contact with the self-supporting surface parts of the heating element (6) occurs, and one arranged vertically below the previous device part Counter bearing (17, 18) which carries the plastic surfaces to be welded. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Schweiß element eine kalt aus einer Kupferscheibe gedrückte Membran hoher statischer Festigkeit verwendet wird. 2. Apparatus according to claim 1, characterized in that the sweat element a membrane of high static strength pressed cold from a copper washer is used. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Kühlelement (11, 12, 13) von einer Abdeckplatte (15) gehalten ist, während die Einspannplatte (5) von durch Bohrungen der Abdeckplatte (15) hindurchgehenden senkrechten Schraubbolzen (7) mit Führungs-und Verstellbuchsen (8) und Stellringen (9) getragen wird. 3. Apparatus according to claim 1 or 2, characterized in that the cooling element (11, 12, 13) is held by a cover plate (15), while the Clamping plate (5) of vertical through holes in the cover plate (15) Screw bolts (7) carried with guide and adjusting bushings (8) and adjusting rings (9) will. 4. Vorrichtung nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß in der Mittelachse der Einspannplatte (5) und der Abdeckplatte (15) vertikal verschiebbar ein an sich bekannter Führungsstempel (2) mit Niederhalter (1) angeordnet ist. 4. Apparatus according to claim 1 to 3, characterized in that vertically displaceable in the central axis of the clamping plate (5) and the cover plate (15) a known guide punch (2) with hold-down device (1) is arranged. In Betracht gezogene Druckschriften: Deutsche Patentanmeldung L 1756 XI/39a (bekanntgemacht am 30.4. 1953); schweizerische Patentschriften Nr. 274 038, 334743; USA.-P.atentschriften Nr. 2 710 986, 2638964; Zeitschrift »Der Maschinenmarkt«, 1956, S. 11 bis 14. Considered publications: German patent application L 1756 XI / 39a (announced April 30, 1953); Swiss patents No. 274 038, 334743; U.S. Patent Nos. 2,710,986, 2638964; Magazine »Der Maschinenmarkt«, 1956, pp. 11 to 14.
DEF30955A 1960-04-08 1960-04-08 Thermal contact welding device for welding layers of thermoplastic materials lying on top of one another, in particular for welding plastic lids onto the bottle edge of plastic cans Pending DE1229277B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
IT649918D IT649918A (en) 1960-04-08
DEF30955A DE1229277B (en) 1960-04-08 1960-04-08 Thermal contact welding device for welding layers of thermoplastic materials lying on top of one another, in particular for welding plastic lids onto the bottle edge of plastic cans
GB12663/61A GB958602A (en) 1960-04-08 1961-04-07 Improvements in or relating to a method and apparatus for welding thermoplastic material by heat-contact welding
SE3685/61A SE303860B (en) 1960-04-08 1961-04-07
FR858301A FR1287730A (en) 1960-04-08 1961-04-08 Device for thermal contact welding of plastic sheets and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF30955A DE1229277B (en) 1960-04-08 1960-04-08 Thermal contact welding device for welding layers of thermoplastic materials lying on top of one another, in particular for welding plastic lids onto the bottle edge of plastic cans

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DE1229277B true DE1229277B (en) 1966-11-24

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DEF30955A Pending DE1229277B (en) 1960-04-08 1960-04-08 Thermal contact welding device for welding layers of thermoplastic materials lying on top of one another, in particular for welding plastic lids onto the bottle edge of plastic cans

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DE (1) DE1229277B (en)
GB (1) GB958602A (en)
IT (1) IT649918A (en)
SE (1) SE303860B (en)

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US5308954A (en) * 1991-10-02 1994-05-03 At&T Bell Laboratories Heat sealing apparatus for splice case having two half shells

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CN107000878B (en) 2014-10-10 2020-04-24 克里奥瓦克公司 Apparatus and process for packaging products
EP3204210B1 (en) 2014-10-10 2020-02-05 Cryovac, LLC Apparatus and process for packaging a product
AU2017224048B2 (en) 2016-02-26 2022-04-07 Cryovac, Llc Heating head for packaging assembly, packaging apparatus and process, manufacturing process for making a heating head
CN109016676A (en) * 2018-09-28 2018-12-18 杭州勤诚塑料包装材料有限公司 For plane bag to be processed into the devices and methods therefor of stereoscopic bag
CN114715456B (en) * 2022-03-31 2024-04-19 山东莯霂生物科技有限公司 Leakage-proof food packaging equipment and method for food processing

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CH274038A (en) * 1949-01-31 1951-03-15 Langer Nicholas Process for welding thermoplastic layers and machine for carrying out this process.
US2638964A (en) * 1950-02-07 1953-05-19 Amsco Packaging Machinery Inc Machine for heat-sealing thermoplastic materials
US2710986A (en) * 1949-10-15 1955-06-21 Injection Molding Company Apparatus for applying inserts or bottoms in plastic containers
CH334743A (en) * 1955-04-26 1958-12-15 Mohr Rudolf Dr Method and device for closing the installation opening of receptacles for electrical collectors made of polyethylene

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH274038A (en) * 1949-01-31 1951-03-15 Langer Nicholas Process for welding thermoplastic layers and machine for carrying out this process.
US2710986A (en) * 1949-10-15 1955-06-21 Injection Molding Company Apparatus for applying inserts or bottoms in plastic containers
US2638964A (en) * 1950-02-07 1953-05-19 Amsco Packaging Machinery Inc Machine for heat-sealing thermoplastic materials
CH334743A (en) * 1955-04-26 1958-12-15 Mohr Rudolf Dr Method and device for closing the installation opening of receptacles for electrical collectors made of polyethylene

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5308954A (en) * 1991-10-02 1994-05-03 At&T Bell Laboratories Heat sealing apparatus for splice case having two half shells

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SE303860B (en) 1968-09-09
GB958602A (en) 1964-05-21
IT649918A (en) 1900-01-01

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