DE811506C - Method for welding plastic films, in particular made of polyethylene - Google Patents

Method for welding plastic films, in particular made of polyethylene

Info

Publication number
DE811506C
DE811506C DEN1381A DEN0001381A DE811506C DE 811506 C DE811506 C DE 811506C DE N1381 A DEN1381 A DE N1381A DE N0001381 A DEN0001381 A DE N0001381A DE 811506 C DE811506 C DE 811506C
Authority
DE
Germany
Prior art keywords
polyethylene
welding
plastic films
welding plastic
particular made
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
DEN1381A
Other languages
German (de)
Inventor
Robert Loch
Franz Dr Meixner
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.)
NORVIN KUNSTSTOFF GmbH
Original Assignee
NORVIN KUNSTSTOFF GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NORVIN KUNSTSTOFF GmbH filed Critical NORVIN KUNSTSTOFF GmbH
Priority to DEN1381A priority Critical patent/DE811506C/en
Application granted granted Critical
Publication of DE811506C publication Critical patent/DE811506C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • 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
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one 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
    • 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
    • B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
    • B29C65/106—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined using flames coming in contact with at least one 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

Verfahren zum Verschweißen von Kunststoffolien, insbesondere aus Polyäthylen Die Verschweißung von Kunststoffolien erfolgt im allgemeinen in der Weise, daß die Folien durch Anwendung eines Schweißkeils, Heißluft oder Hochfrequenz bis zum Erweichen erhitzt werden und dann durch Druck miteinander verschweißen.Process for welding plastic films, in particular made of polyethylene the Welding of plastic films is generally carried out in such a way that the films by using a welding wedge, hot air or high frequency until it softens are heated and then welded together by pressure.

Diese Methode läßt sich zwar auch auf Folien, die einen deutlichen Schmelzpunkt, wie z. B. Polyäthylen, aufweisen, anwenden, doch besteht hier die Gefahr, daß durch den nach dem Erweichen ausgeübten Druck die Schweißstelle besonders bei sehr dünnen Folien durch Kerbwirkung an Festigkeit stark einbüßt. Außerdem ist beim Verschweißen von Polyäthylen meist noch eine Zwischenlage von Cellulosehydrat oder dünner Aluminiumfolie erforderlich, um z. B. bei Rollenschweißung ein Kleben des Polyäthylens an der über dem Schmelzpunkt des Polyäthylens erhitzten Rolle zu vermeiden.This method can also be used on transparencies that give a clear picture Melting point, such as B. polyethylene, have, apply, but here is the There is a risk that the pressure exerted after softening will damage the weld in the case of very thin foils, the strength of the notch is severely reduced. Also is when welding polyethylene there is usually an intermediate layer of cellulose hydrate or thinner aluminum foil required, e.g. B. gluing in the case of roller welding of the polyethylene on the roller heated above the melting point of the polyethylene avoid.

Die Erfindung betrifft nun ein Verfahren, das es ermöglicht, ein Verschweißen der Polyäthylenfolie ohne Anwendung von Druck herbeizuführen, wobei die Schweißnaht keine Veränderung der Festigkeit durch Kerbwirkung erfährt. Auch die Mitverwendung von Cellulosehydrat o. dgl. ist nicht erforderlich. Es ist dies besonders wichtig bei der Herstellung von Säcken und Beuteln aus Polyäthylen. The invention now relates to a method that enables a To bring about welding of the polyethylene film without the application of pressure, wherein the weld seam does not experience any change in strength due to the notch effect. Even the use of cellulose hydrate or the like is not necessary. It is this especially important in the manufacture of polyethylene sacks and bags.

Das Verfahren besteht darin, daß die zu verschweißenden Folien so aufeinandergelegt werden, daß die spätere Schweißstelle eine Kante bildet. The method is that the foils to be welded so are placed on top of one another so that the later weld forms an edge.

Hierauf wird die aufeinander gelegte Folie so zwischen zwei gut wärmeleitende Formteile gelegt, daß die Folienkante auf der einen Seite kurz hervorsteht. Durch direkte Wärmeeinwirkung, z.H.Thereupon the foil placed on top of one another is placed between two highly thermally conductive ones Molded parts placed, that the edge of the film protrudes briefly on one side. Through direct exposure to heat, e.g.

Gasflammen usw., oder einen hocherhitzten Gasstrom, z. B. Stickstoff, um eine Oxydation zu vermeiden, wird die überstehendeKante abgeschmolzen und bildet dann eine feste Schweißnaht. Das Abschmelzen kann auch durch kurzes Andrücken eines stark erhitzten Wärmeträgers aus Metall, Glas oder keramischem Material erfolgen. Durch die kurze Ahschmelzzeit und die gut wärmeabführenden Teile, zwischen denen die Folie liegt, erfolgt. eine Schweißung in der Breite der überstehenden Folienkante.Gas flames etc., or a highly heated gas stream, e.g. B. nitrogen, in order to avoid oxidation, the protruding edge is melted off and forms then a solid weld. The melting can also be achieved by briefly pressing one of the strongly heated heat transfer medium made of metal, glass or ceramic material. Due to the short melting time and the good heat dissipating parts between them the film is on, takes place. a weld in the width of the protruding foil edge.

Im Gegensatz zu den üblichen Schweißmethoden, bei denen die Verschweißung von der Einhaltung hestimmter Temperatur- und Druckgrenzen ahhängig ist, ist das erfindungsgemäße Verfahren davon unabhängig. Es gestattet vielmehr, die Schweißung mit weitaus größerer Geschwindigkeit und Sicherheit durchzuführen. In contrast to the usual welding methods, in which the welding depends on compliance with certain temperature and pressure limits, that is method according to the invention regardless of this. Rather, it allows the weld to be carried out with far greater speed and security.

Claims (1)

PATENTANSPRUCH Verfahren zum Verschweißen von Kunststoffolien, vorzugsweise Polyäthylen, zu Verpackungen, Beuteln o. dgl., dadurch gekennzeichnet, daß die zu verschweißenden Folien zwischen zwei gekühlte Formteile aus gut wärmeleitendem Werkstoff mit einer überstehenden Kante gelegt werden, die durch direkte Wärmeeinwirkung, z. B. Gasflamme, hocherhitzten Gasstrom, oder stark erhitzten Wärmeträger aus Metall, Glas 0. dgl. abgeschmolzen wird. PATENT CLAIM Method for welding plastic films, preferably Polyethylene, to packaging, bags o. The like., Characterized in that the to welding foils between two cooled molded parts made of a material that conducts heat well be laid with a protruding edge, which by direct heat exposure, z. B. gas flame, highly heated gas flow, or highly heated heat transfer medium made of metal, Glass 0. like. Is melted off.
DEN1381A 1950-06-28 1950-06-28 Method for welding plastic films, in particular made of polyethylene Expired DE811506C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEN1381A DE811506C (en) 1950-06-28 1950-06-28 Method for welding plastic films, in particular made of polyethylene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN1381A DE811506C (en) 1950-06-28 1950-06-28 Method for welding plastic films, in particular made of polyethylene

Publications (1)

Publication Number Publication Date
DE811506C true DE811506C (en) 1951-08-20

Family

ID=7337720

Family Applications (1)

Application Number Title Priority Date Filing Date
DEN1381A Expired DE811506C (en) 1950-06-28 1950-06-28 Method for welding plastic films, in particular made of polyethylene

Country Status (1)

Country Link
DE (1) DE811506C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE949991C (en) * 1952-07-29 1956-09-27 Walter Kunik Closure for container with snap-on lid and method and device for closing the container provided with it
DE1064235B (en) * 1952-07-11 1959-08-27 Gerhard Michalik Device for welding together thermoplastic foils
DE1116381B (en) * 1958-10-06 1961-11-02 Louis Doyen Device for welding containers made of thermoplastics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064235B (en) * 1952-07-11 1959-08-27 Gerhard Michalik Device for welding together thermoplastic foils
DE949991C (en) * 1952-07-29 1956-09-27 Walter Kunik Closure for container with snap-on lid and method and device for closing the container provided with it
DE1116381B (en) * 1958-10-06 1961-11-02 Louis Doyen Device for welding containers made of thermoplastics

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