DE3343150A1 - Process for heat-sealing layers, especially for closing containers - Google Patents

Process for heat-sealing layers, especially for closing containers

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Publication number
DE3343150A1
DE3343150A1 DE19833343150 DE3343150A DE3343150A1 DE 3343150 A1 DE3343150 A1 DE 3343150A1 DE 19833343150 DE19833343150 DE 19833343150 DE 3343150 A DE3343150 A DE 3343150A DE 3343150 A1 DE3343150 A1 DE 3343150A1
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DE
Germany
Prior art keywords
layer
layers
lldpe
intermediate layer
heat
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DE19833343150
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German (de)
Inventor
Günter H. Dr.-Ing. 8035 Gauting Marx
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.)
Marx guenter H dr-Ing
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Marx guenter H dr-Ing
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Application filed by Marx guenter H dr-Ing filed Critical Marx guenter H dr-Ing
Priority to DE19833343150 priority Critical patent/DE3343150A1/en
Publication of DE3343150A1 publication Critical patent/DE3343150A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • C08J5/124—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives using adhesives based on a macromolecular component
    • C08J5/128—Adhesives without diluent
    • 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
    • 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
    • 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
    • B29C66/729—Textile or other fibrous material made from plastics
    • 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
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/748—Joining plastics material to non-plastics material to natural products or their composites, not provided for in groups B29C66/742 - B29C66/746
    • B29C66/7486—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0625—LLDPE, i.e. linear low density polyethylene
    • 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
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • B29K2313/02—Use of textile products or fabrics as reinforcement coated
    • 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
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • B29K2711/123—Coated
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

A process for heat-sealing layers together, one layer of which consists of a thermoplastic or a cellulosic material and the other layer of a polyolefin, in particular for the purpose of closing containers or the like formed from such layers. In order even to join layers of such materials which do not permit heat-sealing or do so only by obtaining a low strength, but also to reduce the process costs, it is proposed to use an intermediate layer of LLDPE (linear low density polyethylene) which has a good heat-sealability to both layers. Preferably one of the layers to be sealed is laminated in advance with an LLDPE-film forming the intermediate layer.

Description

Verfahren zum Heißversiegeln von Schichten, insbesondere Process for heat sealing layers, in particular

zum Verschließen von Behältern Die Erfindung betrifft ein Verfahren zum Heißversiegeln einer Schicht aus einem thermoplastischen Kunststoff oder einem Zellulosewerkstoff mit einer Schicht aus einem Polyolefin, insbesondere zum Zweck des Verschließens von aus solchen Schichten gebildeten Behältern od.dgl., bei dem die Schichten über eine aus Polyäthylen bestehende Zwischenschicht miteinander verbunden werden. for closing containers The invention relates to a method for heat sealing a layer made of a thermoplastic material or a Cellulosic material with a layer of a polyolefin, especially for purpose the closing of containers formed from such layers or the like., In the the layers are connected to one another via an intermediate layer made of polyethylene will.

Es ist bekannt, daß Schichten aus thermoplastischem Kunststoff unter Einwirkung von Druck und Wärme heißversiegelt oder miteinander verschweißt werden können. It is known that layers of thermoplastic material under Heat sealed or welded together under the effects of pressure and heat can.

Dieses Verfahren wird z.B. bei sogenannten Siegelbeuteln aus Kunststoffolie oder bei Behältern aus mit Kunststoff beschichtetem Papier oder Karton angewendet, die durch Heißversiegeln verschlossen werden. Es ist auch üblich, einen Heißsiegelverbund zwischen Kunststoffolie einerseits und kunststoffbeschichtetem Papier andererseits herzustellen. Beim Heißversiegeln gilt im allgemeinen, daß der beste Verbund dann erreicht wird, wenn die miteinander zu versiegelnden thermoplastischen Kunststoffe von gleicher Art sind. Es hat sich aber auch gezeigt, daß zwischen verschiedenartigen thermoplastischen Kunststoffen sehr häufig überhaupt kein Verbund erzielbar ist. So ist bekannt, daß sich Polyäthylen mit PVC oder mit Polyester nicht so verschweißen lässt, daß eine ausreichend feste Bindung erhalten wird. Bei einem bekannten Verfahren der eingangs beschriebenen Art (US-PS 33 91 823) wird deshalb beim tieißversiegeln einer Polyäthylenschicht mit einer Polyesterschicht so vorgegangen, daß eine Zwischenschicht aus geschäumtem Polyäthylen vorgesehen wird, die sich sowohl mit der in Form einer Polyäthylenfolie vorliegenden Polyäthylenschicht als auch mit der Polyesterschicht durch Schmelz schweißung verbinden, d.h. heißversiegeln lässt. Dieses Verfahren ist jedoch ausgesprochen aufwendig, weil das Aufbringen der Zwischenschicht aus geschäumtem Polyäthylen im Auftragverfahren durchgeführt werden muß. This process is used, for example, for so-called sealed bags made of plastic film or used for containers made of plastic-coated paper or cardboard, which are closed by heat sealing. It is also common to use a heat seal composite between plastic film on the one hand and plastic-coated paper on the other to manufacture. In the case of heat sealing, the general rule is that the best bond is then is achieved when the thermoplastics to be sealed together are of the same kind. But it has also been shown that between different thermoplastic plastics very often no bond at all can be achieved. It is known that polyethylene does not weld with PVC or polyester lets that one be sufficient firm bond is obtained. At a known method of the type described (US-PS 33 91 823) is therefore proceed as follows when sealing a polyethylene layer with a polyester layer, that an intermediate layer of foamed polyethylene is provided, which both with the polyethylene layer present in the form of a polyethylene film as well as connect to the polyester layer by fusion welding, i.e. heat sealing leaves. However, this process is extremely complex because the application the intermediate layer made of foamed polyethylene carried out by application must become.

Es ist auch schon bekannt, beim Heißversiegeln von thermoplastischem Kunststoff, z.B. Polyäthylen,mit Polyester eine Zwischenschicht aus Monomer, d.h. einem Kopolymer des Äthylens mit Acryl- oder Methacrylsäure zu verwenden.It is also already known in the heat sealing of thermoplastic Plastic, e.g. polyethylene, with polyester an intermediate layer of monomer, i. to use a copolymer of ethylene with acrylic or methacrylic acid.

Ionomere dieser Art sind jedoch ausgesprochen teuer.However, ionomers of this type are extremely expensive.

Schließlich ist es auch schon bekannt, die Versiegelbarkeit von Polyolefinen mit anderen thermoplastischen Kunststoffen oder Zellulosewerkstoffen dadurch zu verbessern oder überhaupt erst zu erhalten, daß die zu versiegelnde Fläche des Polyolefins vor dem Verbinden mit der Gegenfläche einer Koronabehandlung unterzogen wird (vgl. DE-OS 29 29 617).Finally, the sealability of polyolefins is already known with other thermoplastics or cellulose materials improve or even obtain that the surface to be sealed of the polyolefin is subjected to a corona treatment before connecting to the mating surface (cf. DE-OS 29 29 617).

Die Koronabehandlung bringt den gewünschten Erfolg jedoch nur dann, wenn die zu versiegelnde Fläche unmittelbar vor dem Heißsiegelvorgang behandelt wird, was am Verarbeitungsort eine entsprechende Einrichtung voraussetzt.However, the corona treatment only brings the desired success if the surface to be sealed is treated immediately before the heat sealing process which requires an appropriate facility at the processing site.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein einfaches und billigeres Verfahren zu schaffen, das ein Heißversiegeln von solchen Werkstoffen miteinander gestattet, die sich direkt nicht oder nur schlecht versiegeln lassen.The invention is therefore based on the object of a simple and to create a cheaper process involving heat sealing of such materials with each other, which cannot be sealed directly or only poorly.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß als Zwischenschicht eine Schicht aus LLDPE (linear low density-polyethylene) verwendet wird.According to the invention this object is achieved in that as an intermediate layer a layer of LLDPE (linear low density polyethylene) is used.

Es hat sich gezeigt, daß die Verwendung von LLDPE, das in Form von Folien zu einem verhältnismässig günstigen Preis beziehbar ist, eine überraschend billige Lösung für das anstehende Problem ist. Dies erweist sich insbesondere in Zusammenhang mit dem Verschließen von Behältern, die zur sterilen Verpackung von medizinischen Instrumenten od.dgl. dienen. Solche Verpackungen setzen nämlich zumindest örtlich eine gasdurchlässige Schicht voraus, damit nach dem Versiegeln eine Sterilisierung des Inhalts z.B. durch gasförmiges Äthylendioxid vorgenommen werden kann. Zu diesem Zweck ist ein aus sehr feinen Polyäthylenfasern bestehendes papierähnliches Faservlies hoher Festigkeit verwendbar, das sich jedoch mit der den weiteren Teil der Verpackung bildenden thermoplastischen Kunststoffolie oder Schicht aus Zellulosewerkstoff nicht so heißversiegeln lässt, daß eine einwandfrei feste Verbindung erzielt werden kann. Durch das erfindungsgemässe Verfahren ist eine solche Verbindung jedoch möglich, indem die aus LLDPE bestehende Zwischenschicht zweckmässigerweise in Form einer Folie, zumindest im Bereich der die Verschlußnähte bildenden Heißsiegelstellen vorgesehen und dann die Heißversiegelung unter Wärme und Druck vorgenommen wird.It has been shown that the use of LLDPE, which is in the form of Foils can be obtained at a relatively low price, surprisingly cheap solution to the problem at hand is. This is particularly evident in Connection with the closing of containers used for sterile packaging of medical instruments or the like. to serve. Such packaging is at least a factor locally a gas-permeable layer in advance, so that after sealing, sterilization the content can be made e.g. by gaseous ethylene dioxide. To this The purpose is a paper-like fiber fleece made of very fine polyethylene fibers high strength can be used, but with the rest of the packaging forming thermoplastic plastic film or layer made of cellulose material not can be heat-sealed in such a way that a perfectly solid connection can be achieved. However, such a connection is possible by the method according to the invention, by the intermediate layer consisting of LLDPE expediently in the form of a Foil, provided at least in the area of the heat-sealing points forming the sealing seams and then heat sealing is carried out under heat and pressure.

Nach einer zweckmässigen Ausgestaltung ist vorgesehen, daß die LLDPE-Zwischenschicht unmittelbar in Form einer Kaschierung auf einer der beiden zu verbindenden Schichten vorgesehen wird. Das Schutzbegehren richtet sich daher auch auf eine Schicht aus thermoplastischem Kunststoff oder Zellulosewerkstoff oder auf eine Schicht aus Polyolefin, die mit einer LLDPE-Schicht kaschiert ist.According to an expedient embodiment it is provided that the LLDPE intermediate layer directly in the form of a lamination on one of the two layers to be connected is provided. The request for protection is therefore also based on one layer thermoplastic or cellulose material or on a layer of polyolefin, which is laminated with an LLDPE layer.

Es versteht sich, daß die LLDPE-Zwischenschicht nur im Bereich der Stellen vorhanden sein muß, an denen später der Heißsiegelvorgang ausgeführt wird. Nach einer Weiterbildung der Erfindung kann deshalb daran gedacht werden, die Zwischenschicht in Form eines Muster, das am Fertigen Behälter dem Verlauf der Sle<jelnaht und/oder -nähte entspricht, schon auf dem ggJ. nach bahnförmigen Grundmaterial aufzubringen, das die eine Seite oder einen Teil. des Behälters oder der Verpackung bildet. Weiterhin ist es auch nicht erforderlich, die Zwischenschicht über die beabsichtigte Nahtbreite als geschlossene Flache vorzusehen. Vielmehr erweist es sich als vorteilhaft, die Zwischenschicht im Nahtbereich in Form eines Rasters oder Gitters aufzubringen, so daß von dem LLDPE Ürekqehaltene, davon jedoch umrandete Flächenteile vorhanden sind, um hierdurch die Trennfestigkeit der Naht zu steuern. Denn im Bereich der Teil-Flächen, die keine LLDPE-Zwischenschicht aufweisen, erfolgt auch keine Verbindung oder nur eine solche mit geringer Trennfestigkeit, so daß entsprechend dem Flächenanteil dieser Teilflächen an der gesamten Nahtbreite und -länge in geringere Trennfestigkeit vorliegt. Dadurch wird das Öffnen einer auf diese Weise verschlossenen Ver-Packung erleichtert, weil ein Einreißen der Schichten selbst nicht notwendig ist. Es versteht sich jedoch, daß auch bei einer solchen gitter- oder rasterförmigen Ausbildung der I.LI)PF-Zwischenschicht im Nahtbereich die Anordnung so getroffen werden muß, daß keine die ganze Nahtbreite durchsetzende Lücke in der LLDPE-Zwischenschicht, die eine Nahtunterbrechung und damit Undichtigkeit bedeuten würde, vorhanden ist. Das Auftragen des LLDPE in dieser Form erfolgt zweckmässigerweise durch kaschieren mit entsprechend gestanzter Folie oder im schmelzflüssigen Zustand des LLDPE.It goes without saying that the LLDPE intermediate layer is only used in the area of There must be places where the heat sealing process will be carried out later. According to a further development of the invention, thought can therefore be given to the intermediate layer in the form of a pattern, which on the finished container fits the course of the sleeve and / or -seams, already on the ggJ. to be applied according to the sheet-like base material, that one side or a part. of the container or the packaging. Farther It is also not necessary to cut the intermediate layer over the intended seam width to be provided as a closed area. Rather, it proves beneficial to that To apply an intermediate layer in the seam area in the form of a grid or lattice, so that parts of the surface retained by the LLDPE, but surrounded by them, are present in order to control the separation strength of the seam. Because in the field of Partial surfaces that do not have an LLDPE intermediate layer are also not connected or only one with a low separation strength, so that according to the surface area these partial areas in the entire seam width and length in lower separation strength is present. This makes it possible to open a packaging that is closed in this way relieved because it is not necessary to tear the layers themselves. It understands However, that even with such a grid-like or grid-like design of the I.LI) PF intermediate layer in the seam area the arrangement must be made so that no gap in the LLDPE intermediate layer penetrating the entire seam width, the a seam interruption and thus a leak is present. That The LLDPE is expediently applied in this form by lamination with appropriately punched film or in the molten state of the LLDPE.

Claims (6)

Verfahren zum Heißversiegeln von Schichten, insbesondere zum Verschließen von Behältern Ansprüche 1. Verfahren zum Heißversiegeln einer Schicht aus einem thermoplastischen Kunststoff oder einem Zellulosewerkstoff mit einer Schicht aus einem Polyolefin, insbesondere zum Zweck des Verschließens von aus solchen Schichten gebildeten Behältern od.dgl., bei dem die Schichten über eine aus Polyäthylen bestehende Zwischenschicht miteinander verbunden werden, dadurch gekennzeichnet, daß als Zwischenschicht eine Schicht aus LLDPE (linear low density-polyethylene) verwendet wird. Process for the heat sealing of layers, in particular for closing of containers claims 1. A method of heat sealing a layer of a thermoplastic plastic or a cellulose material with a layer of a polyolefin, in particular for the purpose of closing such layers Containers formed or the like. In which the layers are made of polyethylene Intermediate layers are connected to one another, characterized in that as an intermediate layer a layer of LLDPE (linear low density polyethylene) is used. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Schicht aus thermoplastischem Kunststoff ein Vlies aus Polyäthylenfasern und als Zwischenschicht eine LLDPE-Folie verwendet wird.2. The method according to claim 1, characterized in that as a layer made of thermoplastic a fleece made of polyethylene fibers and as an intermediate layer an LLDPE film is used. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die LLDPE-Zwischenschicht auf eine der miteinander heißzuversiegelnden Schichten in einem Muster aufgebracht und mit der Schicht verbunden wird, das dem Verlauf der Siegelnaht bzw. Siegelnähte am fertigen Produkt entspricht.3. The method according to claim 1, characterized in that the LLDPE intermediate layer applied to one of the layers to be heat-sealed together in a pattern and is connected to the layer that follows the course of the sealed seam or seams on the finished product. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die LLDPE-Zwischenschicht auf die Schicht in einem Zustand aufgebracht wird, in der die Schicht noch eben und ggf. bahnförmig ist.4. The method according to claim 3, characterized in that the LLDPE intermediate layer on the layer in one state is applied in which the layer is still flat and possibly web-shaped. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die LLDPE-Zwischenschicht zumindest im Bereich der Siegelnaht bzw. der Siegelnähte in Form eines Gitters oder Rasters aufgebracht wird.5. The method according to any one of claims 1 to 4, characterized in that that the LLDPE intermediate layer at least in the area of the sealed seam or seams is applied in the form of a grid or grid. 6. Schicht aus thermoplastischem Kunststoff oder Zellulosewerkstoff oder Schicht aus Polyolefin, zur Verwendung in dem Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Schicht mit einer Zwischenschicht aus LLDPE kaschiert ist.6. Layer made of thermoplastic or cellulose material or a layer of polyolefin for use in the method according to any one of the claims 1 to 5, characterized in that the layer with an intermediate layer made of LLDPE is concealed.
DE19833343150 1983-11-29 1983-11-29 Process for heat-sealing layers, especially for closing containers Withdrawn DE3343150A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391823A (en) * 1965-03-02 1968-07-09 Vasco Ind Corp Rigidified polyethene structures and method of producing them
DE2929617A1 (en) * 1979-07-21 1981-02-12 Linnich Papier & Kunststoff METHOD FOR HOT SEALING OR WELDING SURFACES, ESPECIALLY ON CONTAINERS OR THE LIKE, AND DEVICE THEREFOR
DE3216097A1 (en) * 1982-04-30 1983-11-03 Feldmühle AG, 4000 Düsseldorf COMPOSITE FILM LAMINATED ON CARRIER FILM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3391823A (en) * 1965-03-02 1968-07-09 Vasco Ind Corp Rigidified polyethene structures and method of producing them
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