DE3425430C2 - Vorrichtung zum Trennschweißen von Kunststoffolien - Google Patents

Vorrichtung zum Trennschweißen von Kunststoffolien

Info

Publication number
DE3425430C2
DE3425430C2 DE3425430A DE3425430A DE3425430C2 DE 3425430 C2 DE3425430 C2 DE 3425430C2 DE 3425430 A DE3425430 A DE 3425430A DE 3425430 A DE3425430 A DE 3425430A DE 3425430 C2 DE3425430 C2 DE 3425430C2
Authority
DE
Germany
Prior art keywords
welding
hold
film
down device
holding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DE3425430A
Other languages
English (en)
Other versions
DE3425430A1 (de
Inventor
Werner 7443 Frickenhausen Diez
Peter 7430 Metzingen Gottwald
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.)
Womako Maschinenkonstruktionen GmbH
Original Assignee
Womako Maschinenkonstruktionen GmbH
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 Womako Maschinenkonstruktionen GmbH filed Critical Womako Maschinenkonstruktionen GmbH
Priority to DE3425430A priority Critical patent/DE3425430C2/de
Priority to IT2140585A priority patent/IT1185171B/it
Priority to US06/752,256 priority patent/US4767482A/en
Publication of DE3425430A1 publication Critical patent/DE3425430A1/de
Application granted granted Critical
Publication of DE3425430C2 publication Critical patent/DE3425430C2/de
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—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
    • B29C66/8161—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 said pressing elements being supported or backed-up by springs or by resilient 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
    • 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
    • B29C66/90—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
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—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
    • B29C66/137—Beaded-edge joints or bead seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—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
    • B29C66/81825—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 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2883/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as mould material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
    • Y10T156/1054—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing and simultaneously bonding [e.g., cut-seaming]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/12—Surface bonding means and/or assembly means with cutting, punching, piercing, severing or tearing
    • Y10T156/1313—Cutting element simultaneously bonds [e.g., cut seaming]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0405—With preparatory or simultaneous ancillary treatment of work
    • Y10T83/0419—By distorting within elastic limit
    • Y10T83/0424—By stretching
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/323—With means to stretch work temporarily

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

Die Erfindung betrifft eine Vorrichtung zum Trennschweißen von Kunststoffolien mit einem die Folie auf eine Unterlage pressenden und auf dieser haltenden Niederhalter und einem beheizten Schweißstempel, wobei der Niederhalter aus einem hitzebeständigen, das Ankleben der Folien verhindernden Material besteht
Derartige Trennschweißvorrichtungen, die vorzugsweise zum Einschweißen von zu verpackendem Gut in Folien verwendet werden, sind hinreichend bekannt
Sie bestehen im allgemeinen aus einem dauerbeheizten Schweißstempel mit einem Schweißmesser oder einem Stempel mit einem impulsbeheizten Trenndraht und aus einem Folienniederhalter aus Stahlblech mit oder ohne Kühleinrichtung.
Der Folienniederhalter hat dabei die Aufgabe, die zu verschweißenden Kunststoffolien plan und ohne Falten beim Beginn des Schweißvorganges auf eine Unterlage, einen Gegenstempel, zu pressen, die Folie zu halten, während das Schweißmesser des Schweißstempels die Folien trennschweißt, sowie die Folie noch kurze Zeit nach dem Abheben des Schweißmessers bis zum Erkalten der Nähte zu halten, damit eine haltbare Schweißnaht erzielt wird.
Besteht bei einem dauerbeheizten Schweißstempel der Niederhalter aus Stahlblech ohne eine Kühleinrichtung, so heizt sich dieser Niederhalter nach kurzer Zeit so auf, daß er die vorstehend beschriebene Funktion nicht mehr erfüllen kann. Die Folie wird durch den Niederhalter in einen plastischen Zustand versetzt, so daß mittels des Schweißmessers keine einwandfreie Schweißnaht mehr erreichbar ist Bei höheren einzuschweißenden Produkten klebt die Folie während der Stempelschließbewegung sogar an den Niederhalterblechen an und schmilzt. Dadurch verschmutzen der Schweißstempel und der Niederhalter sehr schnell, so daß schon in kurzen Zeitabständen eine Reinigung notwendig wird. Eine einwandfreie Folienverpackung wird dabei überhaupt nicht erreicht.
Derartige Niederhalter sind deshalb für dauerbeheizte Schweißstempel ungeeignet. Sie lassen sich allenfalls für einen Stempel mit einem impulsbeheizten Trenndraht verwenden, der mit geringen Taktzahlen arbeitet. Ein solcher wäre für einen kontinuierlichen Betrieb natürlich nicht geeignet.
Für den Betrieb von kontinuierlich arbeitenden Folienschweißmaschinen mit hoher Taktleistung wird deshalb der Niederhalter des Schweißstempels mittels Wasser, Emulsion oder Luft gekühlt.
Bedingt durch die dafür erforderlichen Kühlleitungen weist ein derartiger Niederhalter verhältnismäßig große Abmessungen in seiner Breite auf. Das bedeutet, daß zwischen den in der Folie aufgereihten Produkten größere Lücken gehalten werden müssen. Das hat wiederum zur Folge, daß die eingeschweißten Produkte einen unerwünscht großen Folienbeutel erhalten. Beim anschließenden Schrumpfen wird keine gute Qualität der Verpackung erreicht, da der zu große Folienüberstand nicht restlos wegschrumpft, sondern sich in Falten über das Produkt legt Neben dieser optisch unschönen Verpackung erweist sich natürlich besonders der Mehrverbrauch an Folienmaterial als nachteilig. Weiterhin hat der gekühlte Niederhalter den Nachteil, daß er dem Schweißstempel einen Teil der ihm zugeführten Wärmeenergie entzieht, was zu einem erhöhten Energiebedarf führt Außerdem wird die Folie durch die auf sie auftreffenden starren Bleche des Niederhalters nicht gespannt, sondern nur geheIten. Trennt anschließend das Schweißmesser des Schweißstempels die Folien durch, so werden die Schweißnähte auf den Gegenstempel gedrückt und kleben dort sehr leicht an. Wird nun ein sehr leichtes Produkt verpackt, so kann es vorkommen, daß das Eigengewicht des Produktes nicht ausreicht, um bei seinem Abtransport die festgeklebte Folie vom Gegenstempel zu lösen, was zu Störungen führt
Durch die DE-OS 27 52 176 ist ein Folienschweißgerät der eingangs genannten Art bekannt geworden, bei dem der Niederhalter aus Polytetrafluoräthyien, also einem bereits das Ankleben der Folie am Niederhalter vermeidenden Material besteht Dieser Niederhalter ist so ausgebildet, daß er vorrangig das Einwirken der vom Schweißstempel entwickelten Wärme auf das zu verpackende Gut abschirmen kann. Aber auch dieser Niederhalter ist nicht dazu geeignet, um die Folie auf der Unterlage im Trennschweißbereich gespannt zu halten, so daß auch hiermit die bereits geschilderten diesbezügliehen Mängel nicht beseitigt sind.
Der Erfindung liegt somit die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so weiterzubilden, daß beim Trennschweißen die Folien im Trennschweißbereich gespannt gehalten werden.
Erfindungsgemäß wird das dadurch erreicht, daß der Niederhalter an seinen Halteflächen Schrägen mit nach außen gerichteten federnden Kanten aufweist. Durch die an den Halteflächen des Niederhalters angebrachten Schrägen wird die Folie beim Auftreffen auf den Gegenstempel glatt gespannt. Nach dem Trennschweißen werden die beiden getrennten und mit einer Schweißnaht versehenen Folien durch die federartig nach außen wirkenden Schrägen vom Schweißmesser gelöst, so daß die Schweißnähte sofort erkalten können und somit nicht mehr am Gegenstempel ankleben. Somit sind auch diesbezügliche Störungen ausgeschlossen.
Die Erfindung soll nachstehend anhand eines Ausführungsbeispiels näher erläutert werden.
In den Zeichnungen zeigt
Fig. 1 einen Abschnitt einer Trennschweißvorrichtung,
F i g. 2 den Schnitt A-A nach F i g. 1,
F i g. 3 den Schnitt B-B nach F i g. 1.
An einem Träger 1 (Fig. 1), der sich über eine bestimmte Länge erstreckt, ist ein sich etwa über dieselbe Länge wie der Träger 1 erstreckendes Trennschweißwerkzeug 2 mittels mehrerer in Abständen angeordneter Stangen 3 gehalten, von denen in dem in Fig. 1 dargestellten Abschnitt nur eine ersichtlich ist.
Auf und unter dem Träger 1 sind Teile 4 bzw. 6 vorgesehen, die mit dem Träger 1 durch durchgehende Schraubenbolzen 5a, 5b verbunden sind.
Die Stange 3 ist durch das untere Teil 6, durch den
Träger 1 und durch das obere Teil 4 hindurchgeführt und mittels einer in das obere Ende der Stange 3 zentral eingeschraubten Schraube 7 gegen die Innenseite des Kopfteiles 8 des oberen Teiles 4 verschraabt Auf der Stange 3 befindet sich eine Druckfeder 9, die sich einerseits über eine Scheibe 11 gegen das untere Teil 6 und andererseits gegen eine an der Stange 3 festliegende Scheibe 12 abstützt (F i g. 2).
Das Trennschweißwerkzeug 2 besteht aus einem Schweißstempel 13 und einem Niederhalter 14. Der Schweißstempel 13 ist am Gewindeteil 3a der Stangen 3 befestigt und trägt ein an diesem mit Schrauben 16 befestigtes Schweißmesser 17.
Der Schweißstempel 13 ist mit einer Heizpatrone 18 sowie mit einem Temperaturfühler 10 versehen. Der Niederhalter 14 ist mit dem Schweißstempel 13, zu diesem eine vertikale Relativbewegung gewährleistend, vei bunden. Dies geschieht durch mittels Druckfedern 15 abgestützte Schraubbolzen 20 (F i g. 1 und S). Der Niederhalter 14 besteht aus Niederhalterblechen 14a, t4b, die sich beiderseits des Schweißstempels 13 mit Schweißmesser 17 befinden. Bei der Ansicht nach F i g. 1 ist das vordere Niederhalterblech 146 entfernt. Die Niederhalterbleche 14a, 146 sind mit einer Silikonbeschichtung 19a, 196 versehen. Diese Silikonbeschichtung weist am unteren Ende der Niederhalterbleche 14a, 146 Schrägen 21 a, 21 6 auf, die nach außen gerichtete federnde Kanten 22a, 226 bilden.
Beim Durchführen einer Trennschweißung wird durch Absenken des geführten Trägers 1 zunächst, wie aus F i g. 2 ersichtlich ist, durch den Niederhalter 14 mit seinen Niederhalterblechen 14a, 146 die obere Kunststoffolienbahn 23 auf die untere Kunststoffolienbahn 24 gegen einen Gegenstempel 26 gepreßt, wobei die nach außen gerichteten federnden Kanten 22a, 226 die Folie zwischen sich faltenfrei spannen.
Beim weiteren Absenken des Trägers 1 bewegt sich dann der Schweißstempel 13 mit seinem Schweißmesser 17 gegen die Kraft der Druckfedern 15 relativ zum Niederhalter 14 auf die Folie zu, durchtrennt diese und verschweißt sie an beiden Kanten.
Dabei bewirken die Kanten 22a, 22b der Silikonbeschichtung 19a, 196 der Niederhalterbleche 14a, 146 mit ihren nach außen wirkenden Komponenten ein Lösen der getrennten und mit einer Schweißnaht versehenen Folien vom Schweißmesser 17, so daß die Schweißnähte sofort erkalten können. Auch bei einer großen Höhe der zu verpackenden Produkte 27 und bei kleinen Lücken zwischen den aufgereihten Produkten 27 ist infolge der Silikonbeschichtung ein Ankleben der Folie an den Niederhalterblechen 14a, 146 ausgeschlossen.
Beim Aufwärtsbewegen des Trägers 1 mit dem Trennschweißwerkzeug 2 geht der Schweißstempe! 13 mit seinem Schweißmesser 17 in seine Ausgangslage zurück, in der er an einem mit Dämpfungsmaterial 25 belegten Anschlag 28 des Niederhalters 14 anliegt (Fig. 1).
Hierzu 3 Blatt Zeichnungen

Claims (1)

  1. Patentanspruch:
    Vorrichtung zum Trennschweißen von Kunststoffolien mit einem die Folie auf eine Unterlage pressenden und auf dieser haltenden Niederhalter und einem beheizten Schweißstempel, wobei der Niederhalter aus einem hitzebeständigen, das Ankleben der Folien verhindernden Material besteht, dadurch gekennzeichnet, daß der Niederhalter (14) an seinen Halteflächen Schrägen (21a, 21 ύ) mit nach außen gerichteten federnden Kanten (22a, 22b) aufweist
DE3425430A 1984-07-11 1984-07-11 Vorrichtung zum Trennschweißen von Kunststoffolien Expired DE3425430C2 (de)

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Application Number Priority Date Filing Date Title
DE3425430A DE3425430C2 (de) 1984-07-11 1984-07-11 Vorrichtung zum Trennschweißen von Kunststoffolien
IT2140585A IT1185171B (it) 1984-07-11 1985-07-02 Dispositivo per troncare e saldare fogli di materiale sintetico
US06/752,256 US4767482A (en) 1984-07-11 1985-07-03 Apparatus for severing and heat sealing sheets of thermoplastic material

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DE3425430A DE3425430C2 (de) 1984-07-11 1984-07-11 Vorrichtung zum Trennschweißen von Kunststoffolien

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IT1185171B (it) 1987-11-04
DE3425430A1 (de) 1986-01-23
US4767482A (en) 1988-08-30

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