DE2060403C3 - Vorrichtung zum thermischen Versiegeln von aus einem Schlauch eines Verpackungslaminats bestehenden Verpackungen - Google Patents

Vorrichtung zum thermischen Versiegeln von aus einem Schlauch eines Verpackungslaminats bestehenden Verpackungen

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Publication number
DE2060403C3
DE2060403C3 DE2060403A DE2060403A DE2060403C3 DE 2060403 C3 DE2060403 C3 DE 2060403C3 DE 2060403 A DE2060403 A DE 2060403A DE 2060403 A DE2060403 A DE 2060403A DE 2060403 C3 DE2060403 C3 DE 2060403C3
Authority
DE
Germany
Prior art keywords
sealing
metal layer
packaging
coil
laminate
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
DE2060403A
Other languages
English (en)
Other versions
DE2060403A1 (de
DE2060403B2 (de
Inventor
Gyula Malmoe Balla
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.)
Tetra Pak AB
Original Assignee
Tetra Pak International AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE17018/69A external-priority patent/SE346251B/xx
Application filed by Tetra Pak International AB filed Critical Tetra Pak International AB
Publication of DE2060403A1 publication Critical patent/DE2060403A1/de
Publication of DE2060403B2 publication Critical patent/DE2060403B2/de
Application granted granted Critical
Publication of DE2060403C3 publication Critical patent/DE2060403C3/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • 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
    • B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
    • B65B51/227—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by induction 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
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3668—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • 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
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—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
    • B29C66/7232—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 non-plastics layer
    • B29C66/72321—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 non-plastics layer consisting of metals or their alloys
    • 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
    • B29C66/7232—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 non-plastics layer
    • B29C66/72327—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 non-plastics layer consisting of natural products or their composites, not provided for in B29C66/72321 - B29C66/72324
    • B29C66/72328—Paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—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
    • B29C66/80—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
    • 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
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0008—Magnetic or paramagnetic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/20—Flexible squeeze tubes, e.g. for cosmetics

Description

35
Die Erfindung bezieht sich auf eine Vorrichtung der im Oberbegriff des Patenanspruches 1 genannten Art.
Eine derartige Vorrichtung ist bereits bekannt (CH-PS 4 63 088) und dient zum Versiegeln von Verpackungslaminat, das mindestens eine elektrisch leitfähige Metallschicht und eine Thermoplastschicht aufweist, die zum Versiegeln dient. Das Erhitzen der Thermoplastschicht erfolgt beim Stand der Technik durch das induktive Erhitzen der Metallschicht mittels der elektrischen Spule, die jedoch eine große Induktanz und große Trägheit sowie große transiente Ströme aufweist.
Darüber hinaus ist es beim Versiegeln von tütenförmigen Verpackungsbehältern bekannt, die hochstehende Verschlußrippe mittels zweier Backen zusammenzupressen und dafür zu sorgen, daß in der Metallschicht eine induktive Erwärmung erfolgt, die durch impulsweises Erhitzen der Versiegelungsbacke mit Hilfe von Hochfrequnenzströmen vorgenommen wird. Hierzu dient ein mit Kühlwasser gekühlter Kupferleiter, der in einer der Backen angeordnet ist.
Der Erfindung liegt die Aufgabe zugrunde, das Versiegeln mit Hilfe einer einfach aufgebauten Vorrichtung derart zu verbessern, insbesondere zu beschleunigen, daß mit dem Siegelungsbacken jeweils zwei im Abstand voneinander befindliche Siegelnähte entstehen, um zu einem produktiven Verpackungsverfahren beizutragen, bei dem die Verpackungen trotzdem auch wirklich dicht versiegelt sind.
Die Erfindung ist im Patentanspruch 1 gekennzeichnet. Zweckmäßigerweise sind die Schiene und der Kern in elektrisch isolierendes Material des Siegelungsbakkens eingebettet.
Zu erwähnen ist noch, daß das Einbetten von Spulenschienen in Preßbacken an sich bekannt ist (FR-PS 12 05 655).
Die bei der Erfindung zur Anwendung gelangenden elektrischen Wechselströme sollten eine Frequenz zwischen 0,5 und 2 MHz aufweisen.
Anhand der Zeichnung ist ein Ausführungsbeispiel der Erfindung näher erläutert. Darin zeigt
F i g. 1 in stark vergrößerter Darstellung einen Teilschnitt durch zwei Verpackungslaminate, die an der Versiegelungszone durch zwei Siegelungsbacken zusammengepreßt sind, und
Fig.2 einen Siegelungsbacken in schematischer Darstellung und den elektrischen Anschluß der aus zwei Windungen bestehenden Spulenschiene an einen Hochfrequenzgenerator.
Jede Lage des Verpackungslaminats 6 besteht aus einer Trägerschicht 10, beispielsweise aus Papier oder Pappe, einer inneren Thermoplastschicht 2 zum Versiegeln aus beispielsweise Polyäthylen oder Polypropylen, einer Metallschicht 1, vorzugsweise aus Aluminiumfolie, und einer Laminierungsschicht 9, die als Bindeschicht zwischen der Trägerschicht 10 und der Metallschicht 1 wirkt
Im vorliegenden Fall kann angenommen werden, daß das Verpackungsliminat 6 in Form einer Bahn hergestellt ist, die zu einem Schlauch umgebildet ist, dessen Längskanten, beispielsweise durch eine überlappte Naht, miteinander verbunden sind. Der Schlauch, dessen innere Schicht also aus der Thermoplastschicht 2 besteht, kann daher mit dem abzupackenden Füllgut gefüllt werden, indem diese fortschreitend eingegossen wird. Anschließend wird der Schlauch in Einzelverpakkungseinheiten unterteilt, indem entlang der Schlauchachse in den erforderlichen Abständen voneinander quergerichtete Schweißnähte entlang verhältnismäßig schmaler Versiegelungszonen 7 hergestellt werden.
Dieses Querschweißen des Schlauches wird in vorteilhafter Weise mittels der Vorrichtung nach der Erfindung durchgeführt, die aus zwei Preßeinheiten bzw. Siegelungsbacken 4,5 besteht, die gegeneinander- und auseinanderbewegbar sind und aus elektrisch isolierfähigem Material, beispielsweise Phenoplast, Steatit, Gießharz od. dgl. hergestellt sind. Der Siegelungsbacken 4 ist mit einer als Schiene 3 ausgebildeten Arbeitsspule ausgestattet, die an einen Hochfrequenzgenerator Ganschließbar ist und in der ein ferromagnetischer Kern 8 gegebenenfalls ein Ferritkern, angeordnet ist.
Das Schweißen erfolgt durch Gegeneinanderpressen der Laminate 6 durch die Siegelungsbacken 4,5 die die dazwischengelegte Schlauchzone derart flachpressen, daß die Thermoplastschichten 2 gegeneinandergebogen und gegeneinandergepreßt werden. Wenn dann die Siegelungsbacken 4,5 ihre Preßstellung erreicht haben, wird von dem Hochfrequenzgenerator G ein hochfrequenter Wechselstrom von zwischen 0,5 und 2 MHz, vorzugsweise von ca. 1,5MHz, durch die Arbeitsspule geschickt, die ein hochfrequentes elektromagnetisches Feld erzeugt, das durch die Metallschicht 1 hindurchgeht.
Der Ferrit- oder Eisenpulverkern 8 dient zur Erhöhung der Induktion in der Arbeitsspule. Da durch die Metallschicht 1, die sich in einem Abstand von ca. 0,3 bis 1 mm von der Spule entfernt befindet, ein hochfrequentes elektromagnetisches Feld hindurchgeht, werden in der Metallschicht 1 sogenannte Wirbelströme erzeugt, die in denjenigen Teilen der Metallschicht 1,
die dem Wechselfeld ausgesetzt sind, eine Wärmeentwicklung hervorrufen. Die in der Metallschicht 1 erzeugte Wärme wird den benachbarten Thermoplastschichten 2 zugeleitet Diese werden in einem solchen Maß erhitzt, daß sie zu einer homogenen Naht verschmolzen werden, die nach Abschalten des Wechselfeldes abgekühlt und eine mechanisch dauerhafte Dichtung 7 bildet Nach Beendigung des Schweißvorganges werden die Schweißeinheiten bzw. Siegelungsbacken 4, 5 vom Schweißmaterial entfernt und an einer weiteren Zone des Schlauches abermals angelegt Dieser Vorgang wird laufend wiederholt
Die Anwendung des Verfahrens setzt voraus, daß das versiegelbare Material mindetstens eine Metallschicht bzw. -folie, vorzugsweise eine Aluminiumfolie, enthält und daß diese direkt mit der Thermoplastschicht 2 aus siegelbarem Material laminiert ist denn die für das Versiegeln erforderliche Wärme wird zuerst in der Metallschicht 1 erzeugt und anschließend der Thermoplastschicht 2 aus versiegelbarem Kunststoff zugeführt.
Der in F i g. 2 gezeigte Siegelungsbacken 4 veranschaulicht die Ausbildung der Arbeitsspule, die hier aus zwei in einem Epoxydharz eingebetteten Windungen einer aus Kupfer bestehenden Schiene 3 besteht Die Spulenanschlüsse 11 sind an den Hochfrequenzgenerator G angeschlossen, der einen hochfrequenten Strom von ca. 1,5MHz liefert der einen wechselnden Magnetfluß erzeugt, dessen maximale Feldstärke entlang der Windungen der Schiene 3 konzentriert ist. Da bei einer gemäß F i g. 2 ausgebildeten Versiegelungseinheit das Wechselfeld entlang der Windungen in hohem Maße konzentriert ist, werden beim Versiegeln zwei Schweißnähte gebildet, die sich im Abstand A voneinander befinden. Der geschweißte Schlauch wird zweckmäßigerweise durch Abschneiden zwischen den Schweißzonen bzw. Versiegelungszonen in die vollständig versiegelten Verpackungseinheiten unterteilt. Um eine befriedigende Schweißung über die ganze Schlauchbre-te zu gewährleisten soll die Schiene 3 länger sein als die Breite des plattgedrückten Schlauches, so daß sich sämtliche Teile des Schlauches im Bereich der Spule bzw. Schiene 3 befinden.
Das Verfahren kann als ein Verfahren zum indirekten Erhitzen einer Laminatschichi durch Wärmeerzeugung in einer benachbarten Schicht des gleichen Laminates bezeichnet werden. Im vorliegenden Fall ist die zu erhitzende Schicht eine Schicht aus schweißbarem Thermoplast, die auf die Schweibtemperatur erhitzt werden soll. Dieses Erhitzen der Schicht aus versiegelbarem Material wird in solcher Weise durchgeführt daß eine benachbarte dünne Metallschicht durch ein hochfrequentes elektromagnetisches Feld erhitzt wird, das in der Metallschicht Wirbelstromverluste hervorruft Der Wirbelstrom in der Metallschicht erhitzt das Material der Metallfolie schnell, während die benachbarten Thermoplastschichten von der direkten Einwirkung des hochfrequenten elektromagnetischen Feldes nahezu unbeeinflußt bleiben. Durch die Tatsache, daß die erhitzte Metallschicht der Thermoplastschicht benachbart angeordnet ist, wird diese durch Konvektion von der Metallschicht her, also indirekt, auf die Schweißtemperatur erhitzt.
Es hat sich gezeigt daß durch die Vorrichtung gemäß der Erfindung äußerst kurze Versiegelungszeiten erzielt werden können, da die Wärme nicht erst durch wärmeisolierende Papierschichten 10 hindurchgeleitet zu werden braucht und außerdem Beschädigungen durch Versengen der Außenseite des Verpackungsmaterials vermieden werden, da ja die Arbeitsspule bzw.
. Schiene 3 oder der Siegelungsbacken 4 nur äußerst mäßig erwärmt werden.
Die Vorrichtung kann natürlich auch für andere Verpackungsmaterialien als solche verwendet werden, die entsprechend der obigen Beschreibung erst zu einem Schlauch umgeformt und dann mittels quergerichteter Versiegelungszonen unterteilt werden sollen.
Es besteht natürlich auch die Möglichkeit, in jeder der Siegelungsbacken eine Arbeitsspule vorzusehen.
Hierzu 1 Blatt Zeichnungen

Claims (2)

Patentanspiüche:
1. Vorrichtung zum thermischen Versiegeln von aus einem Schlauch geformten und aus einem Verpackungslaminat bestehenden Verpackungen, wobei das Laminat außer einer elektrisch leitfähigen Metallschicht eine Thermoplastschicht aufweist und die zu verbindenden Laminate mit Hilfe von Siegelungsbacken so zusammendrückbar sind, daß sich die Thermoplastschichten berühren, und mindestens eine Metallschicht durch ein im Bereich der Versiegelungszone im wesentlichen orthogonal bzw. unter rechtem Winkel zur Ebene der Metallschicht angelegtes und über eine elektrische Spule im Siegelungsbacken von einer Spannungsquelle erzeugtes elektromagnetisches Wechselfeld induktiv so erhitzbar ist, daß die an die benachbarten Thermoplastschichten abgegebene Wärme diese in der Versiegelungszone aufschmelzen und dann durch Abkühlen verschmelzen, und bei der die Spule einen magnetisierbaren Kern aufweist, dadurch gekennzeichnet, daß die Spule (3) aus einer Schiene mit zwei Windungen besteht, deren Abstand über die Laminatbreite gleich ist, wobei die Spule (3) einen Abstand von etwa 0,3 bis 1 mm von der Metallschicht (1) hat.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schiene (3) und der Kern (8) in elektrisch isolierendes Material des Siegelungsbakkens (4) eingebettet sind.
DE2060403A 1969-12-10 1970-12-08 Vorrichtung zum thermischen Versiegeln von aus einem Schlauch eines Verpackungslaminats bestehenden Verpackungen Expired DE2060403C3 (de)

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US9515070A 1970-12-04 1970-12-04
US32309573 US3864186A (en) 1969-12-10 1973-01-12 Method for induction sealing packaging material

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CH535113A (de) 1973-03-31
FR2073137A5 (fr) 1971-09-24
GB1327280A (en) 1973-08-22
NL7017840A (de) 1971-06-14
US3864186A (en) 1975-02-04
DE2060403A1 (de) 1971-06-16
DE2060403B2 (de) 1977-11-03
NL169281C (nl) 1982-07-01

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