DE1221432B - Vorrichtung zum Verschweissen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien - Google Patents

Vorrichtung zum Verschweissen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien

Info

Publication number
DE1221432B
DE1221432B DEF38556A DEF0038556A DE1221432B DE 1221432 B DE1221432 B DE 1221432B DE F38556 A DEF38556 A DE F38556A DE F0038556 A DEF0038556 A DE F0038556A DE 1221432 B DE1221432 B DE 1221432B
Authority
DE
Germany
Prior art keywords
welding
stretched
film
plastic films
films
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
DEF38556A
Other languages
English (en)
Inventor
Dipl-Chem Dr Heinz Vates
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.)
Loparex Grundstuecksverwaltungs GmbH
Original Assignee
Folienfabrik Forchheim 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
Priority to NL301691D priority Critical patent/NL301691A/xx
Application filed by Folienfabrik Forchheim GmbH filed Critical Folienfabrik Forchheim GmbH
Priority to DEF38556A priority patent/DE1221432B/de
Priority claimed from DEF40461A external-priority patent/DE1220589B/de
Priority to US33008063 priority patent/US3392504A/en
Priority to CH1525263A priority patent/CH424209A/de
Priority to BE641216A priority patent/BE641216A/xx
Priority to GB4929463A priority patent/GB1030789A/en
Priority to FR957194A priority patent/FR1390994A/fr
Publication of DE1221432B publication Critical patent/DE1221432B/de
Pending 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
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • B29C65/223—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire comprising several heated wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/228—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for electrically connecting the ends of said heated wire, resistive ribbon, resistive band or resistive strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7371—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 state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—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 state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7371—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 state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73711—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 state of the material of the parts to be joined oriented or heat-shrinkable oriented
    • B29C66/73712—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 state of the material of the parts to be joined oriented or heat-shrinkable oriented mono-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—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
    • B29C66/818—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
    • B29C66/8187—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
    • B29C66/81871—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 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
    • B29C66/83—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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • 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
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • 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
    • B29C65/229—Heated wire resistive ribbon, resistive band or resistive strip characterised by the means for tensioning said heated wire, resistive ribbon, resistive band or resistive strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/38—Impulse heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72341—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72343—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for liquids
    • 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
    • B29C66/737—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 state of the material of the parts to be joined
    • B29C66/7371—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 state of the material of the parts to be joined oriented or heat-shrinkable
    • B29C66/73715—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 state of the material of the parts to be joined oriented or heat-shrinkable heat-shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—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
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B29C66/9672—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes involving special data inputs, e.g. involving barcodes, RFID tags
    • 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
    • B29K2909/00—Use of inorganic materials not provided for in groups B29K2803/00 - B29K2807/00, as mould material
    • B29K2909/02—Ceramics
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/005—Oriented
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/005—Oriented
    • B29K2995/0051—Oriented mono-axially

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)

Description

BUNDESREPUBLIK DEUTSCHLAND
DEUTSCHES
PATENTAMT
AUSLEGESCHRIFT
Int. CL:
B 29 c
Deutschem.: 39 a2-19/02
Nummer: 1221432
Aktenzeichen: F 38556 X/39 a2
Anmeldetag: 14. Dezember 1962
Auslegetag: 21. Juli 1966
Gegenstand der Erfindung ist eine Vorrichtung zum Verschweißen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien, welche mit ihrer Reckrichtung gleichlaufend aufeinanderliegen mit einer Heizvorrichtung mit Heizelementen, die mit Abstand parallel zueinander angeordnet sind und nur von einer Seite wirken, wobei der Gegendruck von einem nicht beheizten Körper ausgeübt wird.
Es ist bekannt, Gegenstände unterschiedlicher Art, beispielsweise Packungen, zum Schutz gegen Umwelteinflüsse in Kunststoff-Folien einzuschlagen und danach die sich überlappenden Teile der Folien zwecks Herstellung eines Verschlusses miteinander zu verbinden. Soll der Gegenstand auch in seiner Umhüllung sichtbar sein, bedient man sich hierzu durchsichtiger Folien. Durch die Verwendung von Folien mit hohem Oberflächenglanz, Bedruckung, Prägung, Einfärbung u. dgl. wird den Packungen außerdem ein gefälliges Aussehen verliehen.
Für den genannten Zweck wurden bislang meistens Folien aus Zellglas bzw. Hydratzellulose verwendet. Das Verbinden der sich überlappenden Teile dieser Art Folie erfolgt üblicherweise mit Hilfe wäßriger Klebstoffe. Die Haftfestigkeit an den Klebstellen ist jedoch nicht sehr erheblich. Daneben weist die Zellglasfolie noch den Nachteil auf, daß sie in hohem Maße feuchtigkeitsempfindlich und wasserdampfdurchlässig ist. Um diese Feuchtigkeitsempfindlichkeit und Wasserdampfdurchlässigkeit zu verringern, ist es bekannt, die Folie für bestimmte Anwendungszwecke ein- oder beidseitig mit dünnen Schichten von Schutzlacken zu überziehen, wodurch die Möglichkeit zum Verbinden von Folien im Heißsiegelverfahren gegeben ist. Hierdurch werden jedoch die erwähnten Nachteile nur zum kleineren Teil aufgehoben, wobei noch hinzukommt, daß der Lackauftrag gesonderte, zusätzliche Arbeitsgänge erforderlich macht.
Folien aus Polyvinylchlorid dagegen zeichnen sich durch Wasserdampfundurchlässigkeit und Feuchtigkeitsunempfindlichkeit aus. Man hat sie auf Grund dieser Eigenschaft daher bereits zum Verpacken der verschiedensten Güter verwendet. Wenngleich diese Folien auch den erwünschten Oberflächenglanz aufweisen, so ist doch ihre Durchsichtigkeit im Vergleich zu den bisher benutzten Zellglasfolien geringer. Man erhält jedoch Polyvinylchloridfolien mit einer Durchsichtigkeit, die der der Zellglasfolien gleichkommt, wenn man derartige Folien bei ihrer Herstellung reckt. Durch den Reckvorgang werden gleichzeitig auch ihre mechanischen Eigenschaften, beispielsweise ihre Reißfestigkeit, erheblich verbessert.
Vorrichtung zum Verschweißen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien
Anmelder:
Folienfabrik Forchheim
Gesellschaft mit beschränkter Haftung,
Forchheim (OFr.), Zweibrückenstr. 15-25
Als Erfinder benannt:
Dipl.-Chem. Dr. Heinz Vates,
Stadeln über Nürnberg
Zum Verkleben von Folien, insbesondere solcher aus gerecktem Polyvinylchlorid, sind jedoch Klebstoffe auf wäßriger Grundlage nicht verwendbar, sondern man könnte nur solche benutzen, welche quellend auf die PVC-Folie einwirkende, organische Lösungsmittel enthalten. Diese Lösungsmittel besitzen aber in der Mehrzahl einen Eigengeruch, der leicht auf das Verpackungsgut übergehen kann, was unerwünscht ist. Zum anderen verdunsten diese organischen Lösungsmittel sehr rasch, so daß sich das Aufbringen mit den an den Verpackungsautomaten befindlichen Auftragswerken praktisch nicht durchführen läßt.
Es ist nun bekannt, Kunststoff-Folien, beispielsweise solche aus PVC, durch Verschweißung miteinander zu verbinden. Dieses Verfahren bereitet keine Schwierigkeiten, solange es sich dabei um das Verbinden ungereckter Folien handelt. Ein Verschweißen gereckter Folien, insbesondere weichmacher-, freier, ist aber auf diese Weise nicht möglich, da solche Folien durch die Wärmeeinwirkung beim Schweißvorgang sofort stark schrumpfen, ja sogar einreißen. Die Temperatur, bei der das Schrumpfen eintritt, liegt bei gereckter, weichmacherfreier PVC-Folie um etwa 80° C. Eine Verschweißung tritt dagegen erst bei etwa 180° C ein.
Es ist aber bereits vorgeschlagen worden, gereckte Folien, beispielsweise solche aus weichmacherhaltigem Polyvinylidenchlorid-Mischpolymerisat zu verschweißen. Ein Weichmacherzusatz zu Folien wirkt nicht nur plastifizierend auf sie ein, sondern setzt zudem ihren Erweichungspunkt, bei welchem die Verschweißung eintritt, herab. Wenngleich auch dann der Temperaturunterschied zwischen den Punkten, an denen Schrumpfung und bei welchen Verschwei-
609 590/368
ßung eintritt, verkleinert wird, so ist dennoch das Verschweißen weichmacherhaltiger, gereckter Folien mit Schwierigkeiten verbunden, und fast immer tritt in der Umgebung der Schweißnähte eine das Aussehen beeinträchtigende Kräuselung der Folie, bedingt durch die Schrumpfung ein.
Da der Weichmacher weichmacherhaltiger Folien häufig in das zu verpackende Gut wandert, eignen sich diese Art Kunststoff-Folien daher nicht zum Umhüllen von Lebensmitteln. Diesen Nachteil weisen weichmacherfreie Folien, insbesondere solche aus ge-, recktem, weichmacherfreiem PVC nicht auf, jedoch stößt deren Verschweißung, wie bereits vorstehend aufgeführt, auf große Schwierigkeiten.
Es wurde nun gefunden, daß ein Verbinden gereckter, weichmacherfreier Kunststoff-Folien, insbesondere solcher aus Polyvinylchlorid, möglich ist, wenn man zu diesem Zweck einseitig gereckte, weichmacherfreie Folien verwendet.
Auch eine einseitig gereckte Kunststoff-Folie, insbesondere eine solche aus weichmacherfreiem PVC, schrumpft bei der Wärmeeinwirkung stark. Wird eine solche einseitig gereckte Folie, insbesondere eine solche aus weichmacherfreiem PVC, zwischen zwei üblichen, sehmalen, durchlaufenden länglichen Schweißbacken erhitzt, so wird, wenn die Backen quer zur Reckrichtung verlaufen, die gereckte Folie zwar zwischen den Backen verschweißt, weil sie an dieser Stelle durch den hier auf sie ausgeübten Druck gehalten wird, aber im Bereich der Ränder der Bakken wird die Folie nicht verschweißt, sondern nur erhitzt, wobei sie erweicht. Da es sich um eine gereckte, weichmacherfreie Folie handelt, beginnt sie an den Randstellen schon weit unterhalb der Schweißtemperatur zu schrumpfen und reißt zu beiden Seiten der Backen auf, so daß die Folie durchlöchert und die erstrebte Schutzwirkung dadurch hinfällig ist.
Dieser unerwünschte Übelstand läßt sich überraschenderweise durch die erfindungsgemäße Vorrichtung zum Verbinden von einseitig gereckten Kunststoff-Folien, insbesondere solchen aus Polyvinylchlorid, vermeiden. Erfindungsgemäß wird bei der eingangs bezeichneten Vorrichtung vorgeschlagen, daß die Heizelemente in Richtung der Reckrichtung verlaufen und sie quer zur Reckrichtung eine geringe Auflage aufweisen. Die Heizelemente bestehen hierbei aus Widerstandsdraht geringen Durchmessers. Auch in diesem Fall wird die Folie zwischen dem Heizelement und dem nicht beheizten Körper verschweißt, wobei im Bereich der Backen ebenfalls ein Erweichen eintritt. Da sich aber eine ,einseitig gereckte Folie, insbesondere eine solche aus weichmacherfreiem Polyvinylchlorid, nunmehr quer zu ihrer Reckrichtung ausdehnt, wird sie an diesen Rändern lediglich leicht aufgeworfen, reißt aber nicht auf. Es ist auf diese Weise möglich, beim Umhüllen von Gegenständen, beispielsweise von Schachteln, mit einseitig gereckter Kunststoff-Folie, insbesondere aus weichmacherfreiem PVC, den Überschlag durch Verschweißung der sich überlappenden Folienteile in günstiger Weise zu verbinden. Man erhält auf diese Weise an den Schweißstellen überraschenderweise eine gut haltende und sichere Verbindung der beiden Folienenden.
Zur thermischen Verschweißung thermoplastischer Kunststoff-Folien bedient man sich üblicherweise des Wärmekontakt-, Wärmeimpuls- oder Hochfrequenzverfahrens. Bei der Ausübung des erfindungsgemäßen Verfahrens wird der Anwendung des Wärmeimpuls-Verfahrens der Vorzug gegeben.
Es ist eine Vorrichtung zum Verschweißen thermoplastischer Kunststoff-Folien bekannt, bei der ein heißes Werkzeug auf die Folien kurz aufgedrückt wird. Der Gegendruck wird hierbei von dem zu verpackenden Gegenstand ausgeübt. Hierbei besteht das Werkzeug aus parallel zueinander verlaufenden Heizelementen, die jedoch in Querrichtung eine große
ίο Ausdehnung aufweisen. Bei der Verschweißung wird jedoch keine Rücksicht auf eine eventuelle Reckrichtung der Folie genommen. Zudem eignet sich das Werkzeug mit seinen großflächigen Heizelementen nicht zum Verschweißen von gereckten Kunststoff-Folien.
Es ist bereits eine Schweißvorrichtung bekannt, bei welcher mehrere, getrennt voneinander liegende Schweißelemente in Form spitzer Dorne ausgebildet sind. Da diese Dorne nur einen kleinen Durchmesser besitzen, besteht die große Gefahr, daß gereckte Folien beim Verschweißen mit dieser bekannten Vorrichtung aufreißen, so daß der Zweck der Folie hinfällig wird. Zudem sind die Schweißstellen sehr klein, so daß eine zufriedenstellende Verbindung beider Folienenden mit der gewünschten Sicherheit nicht gewährleistet ist.
Die erfindungsgemäße Vorrichtung vermeidet diesen Nachteil. Das Schweißwerkzeug besteht aus mehreren einzelnen, getrennt in einer Reihe angeordneten Schweißelementen, deren Breite quer zur Reckrichtung der einseitig gereckten Folie möglichst ge-' ring ist, die aber gleichlaufend mit der Reckvorrichtung eine, ihre Breite um ein Vielfaches übertreffende Längenausdehnung besitzen. Beim Arbeiten nach dem Wärmeimpulsverfahren kann ein Schweißwerkzeug, das aus einer Heizspirale aus Widerstandsdraht besteht, benutzt werden. Vorteilhaft hat das Schweißwerkzeug zu diesem Zweck die Form' einer flachen Spirale, die auf einem flachen Träger, z.B. einem Keramik- oder Glasrohr aufgewickelt ist. Nach einer bevorzugten Ausführung kann der Träger von einem geeigneten Kühlmittel durchflossen werden.
Die beiliegende Zeichnung zeigt schematisch ein Ausführungsbeispiel einer erfindungsgemäß zu verwendenden Vorrichtung. Auf den flachen Träger 1 aus Keramik- oder Glasrohr ist in parallelen, in einem Abstand von ungefähr 5 bis 10 mm voneinander liegenden Windungen eine Spirale 2 aus Widerstandsdraht aufgebracht. Dieser z. B. aus Konstanten bestehende Widerstandsdraht, hat einen möglichst geringen Durchmesser, z. B. 0,4 mm. Die Länge des flachliegenden Teiles der Spirale beträgt beispielsweise 5 bis 10 mm. Die Spirale 2 wird über die Anschlüsse 3 und 3' miteis elektrischen Stromes nach dem Wärmeimpulsverfahren erhitzt. Der Träger 1 wird über den Zufluß 4 bzw. Abfluß 4' von einem geeigneten Kühlmittel durchflossen. An der Vorrichtung sind ferner Einrichtungen vorgesehen, mit Hilfe derer es möglich ist, entsprechend dem Widerstand des Drahtes die Stromspannung und die Wärmeimpulsdauer zu verändern, um sie auf die geeignetste Schweißtemperatur und -dauer einregulieren zu können.
Zur Ausübung des erfindungsgemäßen Verfahrens kann diese Vorrichtung mit einer ihrer Flachseiten gegen die Überlappung der beiden Enden einseitig gereckter Kunststoff-Folien, insbesondere solcher aus weichmacherfreiem PVC, unter dem notwendigen
Druck herangeführt werden, und zwar so, daß die Vorrichtung quer zur Reckrichtung der Folie zu liegen kommt, d. h. also, daß einzelne Abschnitte der Flachwicklung gleich mit der Reckrichtung der Folie laufen. Dies läßt sich in einfacher Weise mit der Hand oder auch durch ein Pedal bewerkstelligen. Die Vorrichtung läßt sich aber auch leicht in Verpackungsautomaten einbauen.

Claims (2)

Patentansprüche:
1. Vorrichtung zum Verschweißen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien, welche mit ihrer Reckrichtung gleichlaufend aufeinanderliegen mit einer Heizvorrichtung mit Heizelementen, die mit Abstand parallel zueinander angeordnet sind und nur von einer Seite wirken, wobei der Gegendruck von einem nichtbeheizten Körper ausgeübt wird, dadurch gekennzeichnet, daß die Heizelemente in Richtung der Reckrichtung verlaufen und sie quer zur Reckrichtung eine geringe Auflage aufweisen.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Heizelemente aus Widerstandsdraht geringen Durchmessers bestehen.
In Betracht gezogene Druckschriften:
Deutsche Auslegeschrift Nr. 1082 732;
österreichische Patentschriften Nr. 208 065,
194130;
USA.-Patentschrift Nr. 2768 272;
DIN-Blatt Nr. 16 930.
Hierzu 1 Blatt Zeichnungen
609 590/368 7.66 © Bundesdruckerei Berlin
DEF38556A 1962-12-14 1962-12-14 Vorrichtung zum Verschweissen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien Pending DE1221432B (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL301691D NL301691A (de) 1962-12-14
DEF38556A DE1221432B (de) 1962-12-14 1962-12-14 Vorrichtung zum Verschweissen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien
US33008063 US3392504A (en) 1962-12-14 1963-12-12 Method of packaging articles in stretched plastic foils
CH1525263A CH424209A (de) 1962-12-14 1963-12-12 Verfahren und Vorrichtung zum Verbinden gereckter Kunststoff-Folien, insbesondere solcher aus Polyvinylchlorid
BE641216A BE641216A (de) 1962-12-14 1963-12-12
GB4929463A GB1030789A (en) 1962-12-14 1963-12-13 Improvements relating to the seaming of stretched plastics films
FR957194A FR1390994A (fr) 1962-12-14 1963-12-13 Procédé et appareil pour unir des feuilles de matière plastique étirées, en particulier des feuilles de chlorure de polyinyle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEF38556A DE1221432B (de) 1962-12-14 1962-12-14 Vorrichtung zum Verschweissen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien
DEF40461A DE1220589B (de) 1963-08-09 1963-08-09 Vorrichtung zum Banderolieren von Packungen mit Kunststoff-Folien

Publications (1)

Publication Number Publication Date
DE1221432B true DE1221432B (de) 1966-07-21

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Application Number Title Priority Date Filing Date
DEF38556A Pending DE1221432B (de) 1962-12-14 1962-12-14 Vorrichtung zum Verschweissen von zwei einseitig gereckten thermoplastischen Kunststoff-Folien

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US (1) US3392504A (de)
BE (1) BE641216A (de)
CH (1) CH424209A (de)
DE (1) DE1221432B (de)
GB (1) GB1030789A (de)
NL (1) NL301691A (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3468412A (en) * 1966-06-08 1969-09-23 Harold M Forman Shrink film packages and packaging methods
US3978638A (en) * 1970-08-20 1976-09-07 Mobil Oil Corporation Package construction of articles with shrink film
US4014155A (en) * 1972-06-06 1977-03-29 Glory Kogyo Kabushiki Kaisha Coin wrapping method
US4419855A (en) * 1980-11-24 1983-12-13 Shanklin Frank G Low drag static seamer
DE4205583A1 (de) * 1992-02-24 1993-08-26 Windmoeller & Hoelscher Schweissband
AT508982B1 (de) * 2009-11-02 2013-03-15 Herwig Worff Verfahren zum verschliessen eines sackkörpers
AT509141A1 (de) * 2009-11-23 2011-06-15 Herwig Worff Verfahren zum verschliessen eines sackkörpers
RU2680034C2 (ru) 2014-10-10 2019-02-14 Криовак, Инк. Устройство и способ упаковки продукта

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US2768272A (en) * 1952-12-24 1956-10-23 Du Pont Apparatus for heat-sealing thermoplastic material
AT194130B (de) * 1954-04-16 1957-12-27 Int Standard Electric Corp Nahtbildendes elektrisches Heizelement
AT208065B (de) * 1956-12-07 1960-03-25 Hoechst Ag Verfahren zum Verschweißen von gereckten, insbesondere biaxial gereckten Folien aus schweißbaren thermoplastischen Kunststoffen
DE1082732B (de) * 1955-07-08 1960-06-02 Du Pont Verfahren zum Verschweissen von in beiden Richtungen gereckten und danach formfestgemachten Kunststoff-gebilden aus Polyterephthalsaeureestern

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US2999042A (en) * 1956-10-01 1961-09-05 Bagcraft Corp Method of producing plastic seam
US2992958A (en) * 1957-08-16 1961-07-18 Yamaguchi Sakuji Method of welding nylon and similar fabrics made of synthetic fibers by high frequency energy
US3033257A (en) * 1957-08-21 1962-05-08 H G Weber And Company Inc Bag forming tube and method of forming and accumulating the same
US3081571A (en) * 1959-09-18 1963-03-19 Grace W R & Co Method of decorating heat shrinkable, irradiated, biaxially oriented polyethylene
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Publication number Priority date Publication date Assignee Title
US2768272A (en) * 1952-12-24 1956-10-23 Du Pont Apparatus for heat-sealing thermoplastic material
AT194130B (de) * 1954-04-16 1957-12-27 Int Standard Electric Corp Nahtbildendes elektrisches Heizelement
DE1082732B (de) * 1955-07-08 1960-06-02 Du Pont Verfahren zum Verschweissen von in beiden Richtungen gereckten und danach formfestgemachten Kunststoff-gebilden aus Polyterephthalsaeureestern
AT208065B (de) * 1956-12-07 1960-03-25 Hoechst Ag Verfahren zum Verschweißen von gereckten, insbesondere biaxial gereckten Folien aus schweißbaren thermoplastischen Kunststoffen

Also Published As

Publication number Publication date
NL301691A (de)
BE641216A (de) 1964-04-01
CH424209A (de) 1966-11-15
GB1030789A (en) 1966-05-25
US3392504A (en) 1968-07-16

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