DE4024373A1 - Low thermal conductivity weldable pack - has areas coated with weldable polymer which incorporate material absorbing HF energy and heat up in applied field - Google Patents

Low thermal conductivity weldable pack - has areas coated with weldable polymer which incorporate material absorbing HF energy and heat up in applied field

Info

Publication number
DE4024373A1
DE4024373A1 DE4024373A DE4024373A DE4024373A1 DE 4024373 A1 DE4024373 A1 DE 4024373A1 DE 4024373 A DE4024373 A DE 4024373A DE 4024373 A DE4024373 A DE 4024373A DE 4024373 A1 DE4024373 A1 DE 4024373A1
Authority
DE
Germany
Prior art keywords
plastic
packaging according
packaging
microwave energy
weldable
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.)
Withdrawn
Application number
DE4024373A
Other languages
German (de)
Inventor
Guenther Dr Perthen
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.)
Christian Majer & Co Kg 7400 Tuebingen De GmbH
Christian Majer GmbH and Co KG Maschinenfabrik
Original Assignee
Christian Majer & Co Kg 7400 Tuebingen De GmbH
Christian Majer GmbH and Co KG Maschinenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Christian Majer & Co Kg 7400 Tuebingen De GmbH, Christian Majer GmbH and Co KG Maschinenfabrik filed Critical Christian Majer & Co Kg 7400 Tuebingen De GmbH
Priority to DE4024373A priority Critical patent/DE4024373A1/en
Publication of DE4024373A1 publication Critical patent/DE4024373A1/en
Withdrawn legal-status Critical Current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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1425—Microwave radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission 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
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1477—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier
    • B29C65/1483—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier coated on the article
    • 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
    • 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
    • B29C66/01—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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/542—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles joining hollow covers or hollow bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
    • 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
    • B29C66/73—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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Laminated Bodies (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A pack is made of material which is a poor conductor of heat and has parts where plastic material can be welded together. Those parts are treated or coated with a material which absorbs, (pref.) h/f energy and is pref. a ceramic of oxides of their compounds. ADVANTAGE - The packing material can be welded together with inexpensive equipment but without needing conducting coatings or the direct application of welding pressure tools.

Description

Die Erfindung betrifft eine Verpackung, bestehend aus schlecht wärmeleitendem Material und mit Bereichen, in denen ein Verschweißen von Kunststoffmaterial erfolgen soll.The invention relates to a package consisting of poor heat conducting material and with areas in which are welded plastic material should.

Aus Kunststoffmaterial bestehende Verpackungen, insbesondere aus Kunststoffolie bestehende Verpackungen, werden üblicherweise mittels beheizter Schweißstempel, -köpfe, -rollen durch direkte Wärmeeinwirkung an den gewünschten Stellen miteinander verschweißt. Bei dickem Material mit schlechter Wärmeleitung sind die Taktzeiten sehr lang, und es besteht oft die Gefahr einer Oberflächenbeschädigung. Hier wird üblicherweise ein berührungsloses, kapazitives oder induktives Schweißverfahren angewandt. Bei Verpackungen aus Verbundfolie, welche einem mit einem PVC-Überzug versehene Aluminium-Folienauflage aufweisen, wird überwiegend das induktive Schweißverfahren angewandt, bei welchem die Erwärmung durch Wirbelstrombildung in der Aluminiumschicht erzielt wird.Packaging consisting of plastic material, in particular packaging made of plastic film usually by means of heated welding punches, heads, -roll through direct heat to the desired Places welded together. With thick material with poor heat conduction, the cycle times are very long, and there is often a risk of surface damage. This is usually a non-contact, capacitive or inductive welding. For packaging made of composite film, which one with a PVC coating provided aluminum foil overlay is predominantly  the inductive welding process applied, in which heating due to eddy current formation in the aluminum layer is achieved.

Es ist auch bekannt, PVC-beschichtete Materialien in einem elektrischen Hochfrequenzfeld zum Zweck des Verschweißens zu erwärmen. Bei diesem kapazitiven Schweißverfahren, wie auch bei einem Verschweißen mittels Laser, sind jedoch teure Einrichtungen erforderlich. Auch ist die Ausfallquote relativ hoch, weil hier der Feuchtigkeitsgehalt, beispielsweise von beschichtetem Papiermaterial, eine wesentliche Rolle spielt. Hier muß mit elektrischen Überschlägen gerechnet werden, durch welche anstelle einer Schweißnaht Löcher im zu verschweißenden Verpackungsmaterial entstehen.It is also known to use PVC coated materials in one high frequency electric field for the purpose of welding to warm up. With this capacitive welding process, such as even when welding by laser, however expensive facilities required. The default rate is also relatively high, because here the moisture content, for example of coated paper material, a plays an important role. Here must be with electrical flashovers by which instead of one Holes in the packaging material to be sealed arise.

Nachdem in verstärktem Maße zwecks Verminderung der Umweltbelastung durch Verpackungen Verbundstoffolien mit Aluminiumbeschichtung vermieden werden und damit auch induktive Schweißverfahren nicht mehr angewandt werden können, hat sich bei der vorliegenden Erfindung die Aufgabe gestellt, Verpackungen der eingangs genannten Art so auszubilden, daß sie mit vertretbarem Geräteaufwand auch ohne Vorhandensein elektrisch leitender Materialbeschichtungen ohne die direkte Einwirkung von Schweißstempeln od. dgl. miteinander verschweißt werden können.After to a greater extent in order to reduce environmental pollution through packaging with composite films Aluminum coating can be avoided and thus inductive welding processes are no longer used can, has the task in the present invention provided, packaging of the type mentioned above train that they with reasonable equipment effort too without the presence of electrically conductive material coatings without the direct impact of welding punches or the like. Can be welded together.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Verpackung in den zu verschweißenden Bereichen mit einem bevorzugt Mikrowellenenergie absorbierenden Werkstoff versetzt oder beschichtet ist. Dies kann ein keramisches Material oder auch eine Kunststoffolie mit besonders hohen dielektrischen Verlusten bei der verwendeten Mikrowellenfrequenz sein.The object is achieved according to the invention in that that the packaging in the areas to be welded with a preferably microwave energy absorbing material is offset or coated. This can be a ceramic  Material or a plastic film with special high dielectric losses at the microwave frequency used be.

Bei einer Verpackung gemäß der Erfindung läßt sich also eine Erwärmung mittels Mikrowellen durchführen und damit ein Verschweißen mit Hilfe von an Mikrowellenherden bereits erprobten Geräten erzielen, die weniger aufwendig als kapazitive Schweißeinrichtungen sind und vor allem mit größerer Sicherheit als jene betrieben werden können. Es gibt Werkstoffe, insbesondere keramische Werkstoffe, die aus Oxiden oder Oxidverbindungen bestehen, die in Mikro­ wellen-Frequenzbereichen bevorzugt Energie absorbieren.With a packaging according to the invention, perform heating by means of microwaves and thus welding with the help of microwave ovens already Get proven devices that are less expensive as capacitive welding devices and especially with greater security than that can be operated. It are materials, especially ceramic materials, that consist of oxides or oxide compounds that are in micro wave frequency ranges prefer to absorb energy.

Der Mikrowellenenergie absorbierende Werkstoff kann auf unterschiedliche Weise zur Anwendung kommen. Beispielsweise kann er in das Verpackungsmaterial selbst eingearbeitet sein. Er kann aber auch nur in den Schweißbereichen auf das Verpackungsmaterial, z. B. als Folie oder Beschichtung, aufgebracht sein. So kann der Mikrowellenenergie absorbierende keramische Werkstoff in den zu verschweißenden Bereichen zusammen mit einem Kunststoff- Lösungsmittel auf das zu verschweißende Material aufgebracht sein oder zwischen Papier und einer siegelfähigen Beschichtung angeordnet sein. Das Mikrowellenenergie absorbierende Material läßt sich aber auch in einer Leimschicht möglichst nahe den gewünschten Verschweißungsstellen auf beispielsweise vorgeformte und miteinander zu verbindende Verpackungskörper aufbringen. Ein keramisches Material läßt sich in Pulverform oder als Kleinstgranulat anwenden.The microwave energy absorbing material can come in different ways. For example can be incorporated into the packaging material itself be. But it can only be used in the welding areas on the packaging material, e.g. B. as a film or Coating. So the microwave energy absorbent ceramic material in the welded Areas together with a plastic Solvent applied to the material to be welded be or between paper and a sealable Coating may be arranged. That microwave energy absorbent material can also be in a layer of glue as close as possible to the desired welding points for example preformed and together Apply connecting packaging. A ceramic Material can be in powder form or as small granules apply.

Nachfolgend werden drei Ausführungsbeispiele von erfindungsgemäß ausgebildeten Verpackungen anhand der Zeichnung erläutert.Below are three exemplary embodiments of the invention trained packaging based on the Drawing explained.

Im einzelnen zeigtIn detail shows

Fig. 1 eine schematische Darstellung einer Schweißverbindungsstelle zwischen zwei Kunststoffolien, Fig. 1 is a schematic illustration of a welding joint between two plastic sheets,

Fig. 2 einen Schnitt durch den Befestigungsbereich des Bodens einer Verbunddose, Fig. 2 shows a section through the attachment region of the base of a composite can,

Fig. 3 einen Schnitt durch den Befestigungsbereich des Bodens einer anderen Verbunddose. Fig. 3 shows a section through the fastening area of the bottom of another compound box.

Fig. 1 zeigt zwei Kunststoffolien 10 und 11 oder Kunststoffplatten, die in dem durch Kreuze gekennzeichneten Bereich 12 durch die Einwirkung von Mikrowellen miteinander verschweißt werden sollen. Hierzu ist auf die dem Schweißverbindungsbereich 12 abgewandte Seite 10.1 der einen Kunststoffolie ein Lösungsmittel aufgebracht worden, das mit pulverförmigem keramischen Werkstoff 13, der Mikrowellenenergie absorbiert, versetzt ist. Durch das Lösungsmittel, das sich anschließend verflüchtigt, ist das in der Fig. 1 durch Punkte angedeutete Keramikpulver 13 in die Kunststoffolie 10 eingedrungen. Unter Mikrowelleneinfluß erwärmt sich das Keramikpulver 13 so stark, daß ein Anschweißen der anderen Kunststoffolie 11 im Bereich 12 erfolgt. Fig. 1 shows two plastic films 10 and 11 or plastic plates, which are to be welded together in the area 12 marked by crosses by the action of microwaves. For this purpose, on the side 10.1 of the one plastic film facing away from the welded connection area 12, a solvent has been applied, which is mixed with powdered ceramic material 13 , which absorbs microwave energy. The ceramic powder 13 indicated by dots in FIG. 1 has penetrated into the plastic film 10 due to the solvent which then evaporates. Under the influence of microwaves, the ceramic powder 13 heats up so strongly that the other plastic film 11 is welded on in the region 12 .

Fig. 2 zeigt einen Querschnitt durch den Fußteil einer Verbunddose, deren Dosenkörper 14 mit seinem unteren Rand 14.1 um den abgewinkelten Rand 15.1 eines eingesetzten Dosenbodens 15 herumgebördelt ist. Dosenkörper 14 und Dosenboden 15 sind aus Pappe hergestellt. Der Dosenkörper 14 ist auf seiner Innenseite mit einer Kunststoffschicht 16 versehen. Der Dosenboden 15 weist auf beiden Seiten eine Kunststoffbeschichtung 17 oder 18 auf. Um die durch Kreuze gekennzeichneten Schweißverbindungsbereiche 19 und 20 im Umbördelungsbereich der Verbunddose zu schaffen, ist am Dosenkörper 14 über seinen ganzen Umfangsbereich in seinem unteren Randbereich zwischen der Kunststoffschicht 16 und dem Dosenkörper 14 eine Schicht 21 aus Mikrowellenenergie absorbierendem Werkstoff angeordnet. Auch der Boden 15 weist in seinem abgewinkelten Randbereich 15.1 eine solche Schicht 22 zwischen der Kunststoffbeschichtung 17 und dem Boden 15 auf. Unter Mikrowelleneinwirkung erwärmen sich die Schichten 21 und 22 so stark, daß die sich in ihrem Bereich befindlichen Kunststoffschichten 16, 17 und 18 miteinadner verschweißen. Fig. 2 shows a cross section through the foot part of a composite can, the can body 14 is flanged with its lower edge 14.1 around the angled edge 15.1 of an inserted can bottom 15 . Can body 14 and can bottom 15 are made of cardboard. The can body 14 is provided on the inside with a plastic layer 16 . The can base 15 has a plastic coating 17 or 18 on both sides. In order to create the welded connection areas 19 and 20 identified by crosses in the flanging area of the compound can, a layer 21 of microwave energy absorbing material is arranged on the can body 14 over its entire peripheral area in its lower edge area between the plastic layer 16 and the can body 14 . The bottom 15 also has such a layer 22 in its angled edge region 15.1 between the plastic coating 17 and the bottom 15 . Under the action of microwaves, the layers 21 and 22 heat up so strongly that the plastic layers 16 , 17 and 18 located in their area weld to one another.

Fig. 3 zeigt den Bodenverbindungsbereich einer Verbunddose, deren beispielsweise aus Papierbahnen gewickelter Dosenkörper 24 auf seiner Innenseite eine Kunststoffbeschichtung 26 trägt. Der wiederum mit einem Randflansch 25.1 versehene Boden 25 der Verbunddose ist aus Pappmaterial gefertigt, in welches durch Punkte angedeutetes keramisches Kleinstgranulat 28 eingearbeitet ist. Der Boden 25 ist zur Doseninnenseite hin ebenfalls mit einer Kunststoffbeschichtung 27 versehen. Unter Mikrowelleneinfluß erwärmt sich das keramische Kleinstgranulat und damit der Boden 25 mit seinem Flansch 25.1 so stark, daß eine Schweißverbindung 29 zwischen den im Bodenbereich der Dose gegeneinanderliegenden Kunststoffbeschichtungen 26 und 27 erfolgt. Fig. 3 shows the bottom connection area of a composite can, for example, the wound from paper webs can body 24 carries on its inside a plastic coating 26. The bottom 25 of the compound can, which in turn is provided with an edge flange 25.1 , is made of cardboard material into which small ceramic granules 28 indicated by dots are incorporated. The bottom 25 is also provided on the inside of the can with a plastic coating 27 . Under the influence of microwaves, the small ceramic granules and thus the bottom 25 with its flange 25.1 are heated so strongly that a welded connection 29 takes place between the plastic coatings 26 and 27 lying opposite one another in the bottom region of the can.

Claims (9)

1. Verpackung, bestehend aus schlecht wärmeleitendem Material und mit Bereichen, in denen ein Verschweißen von Kunststoffmaterial erfolgen soll, dadurch gekennzeichnet, daß sie in den zu verschweißenden Bereichen mit einem bevorzugt Mikrowellenenergie absorbierenden Werkstoff (13, 21, 22, 28) versetzt oder beschichtet ist.1. Packaging consisting of poorly heat-conducting material and with areas in which a welding of plastic material is to take place, characterized in that it is mixed or coated in the areas to be sealed with a preferably microwave energy absorbing material ( 13 , 21 , 22 , 28 ) is. 2. Verpackung nach Anspruch 1, dadurch gekennzeichnet, daß der Mikrowellenenergie absorbierende Werkstoff in den zu verschweißenden Bereichen (12) zusammen mit einem Kunststoff-Lösungsmittel auf das zu verschweißende Kunststoffmaterial (10) aufgebracht ist (Fig. 1).2. Packaging according to claim 1, characterized in that the microwave energy absorbing material in the areas to be welded ( 12 ) is applied together with a plastic solvent to the plastic material to be welded ( 10 ) ( Fig. 1). 3. Verpackung nach Anspruch 1, die aus Papier oder Pappe besteht, das bzw. die in den zu verschweißenden Bereichen mit einer Kunststoffbeschichtung versehen ist, dadurch gekennzeichnet, daß der Mikrowellenenergie absorbierende Werkstoff zwischen dem Papier (14, 15) und der Kunststoffbeschichtung (16, 17) angeordnet ist (Fig. 2).3. Packaging according to claim 1, which consists of paper or cardboard, or which is provided in the areas to be welded with a plastic coating, characterized in that the microwave energy absorbing material between the paper ( 14 , 15 ) and the plastic coating ( 16 , 17 ) is arranged ( Fig. 2). 4. Verpackung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Mikrowellenenergie absorbierende Werkstoff auf der in dem schlecht wärmeleitenden Material in einer Leimschicht angeordnet ist. 4. Packaging according to one of claims 1 to 3, characterized characterized in that the microwave energy absorbing Material on the in the poorly heat conductive Material is arranged in a layer of glue.   5. Verpackung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie aus einer Verpackungsfolie besteht, die mindestens mit einer Außenschicht aus Kunststoffmaterial besteht.5. Packaging according to one of claims 1 to 4, characterized characterized that it consists of a packaging film, the at least with an outer layer of plastic material consists. 6. Verpackung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie aus mehreren vorgeformten und miteinander verbundenen Verpackungs-Formkörpern besteht, die im Bereich ihrer Verbindungsstellen Kunststoffmaterial und bevorzugt Mikrowellenenergie absorbierenden Werkstoff aufweisen.6. Packaging according to one of claims 1 to 4, characterized characterized in that it consists of several preformed and interconnected molded packaging, the plastic material in the area of their connection points and preferably absorbing microwave energy Have material. 7. Verpackung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der bevorzugt Mikrowellenenergie absorbierende Werkstoff ein keramischer Werkstoff ist.7. Packaging according to one of claims 1 to 6, characterized characterized in that the preferred microwave energy absorbent material is a ceramic material. 8. Verpackung nach Anspruch 7, dadurch gekennzeichnet, daß der keramische Werkstoff mindestens überwiegend aus Oxiden und/oder Oxidverbindungen besteht.8. Packaging according to claim 7, characterized in that the ceramic material at least predominantly Oxides and / or oxide compounds. 9. Verpackung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der keramische Werkstoff als Pulver oder Kleinstgranulat verwendet ist.9. Packaging according to one of claims 1 to 8, characterized characterized in that the ceramic material as a powder or small granules is used.
DE4024373A 1990-08-01 1990-08-01 Low thermal conductivity weldable pack - has areas coated with weldable polymer which incorporate material absorbing HF energy and heat up in applied field Withdrawn DE4024373A1 (en)

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