DE2752202A1 - Heat-welding polyolefin films - with heated punch that wholly penetrates top but only partly bottom ply to use squeezed-out melt for forming seam - Google Patents

Heat-welding polyolefin films - with heated punch that wholly penetrates top but only partly bottom ply to use squeezed-out melt for forming seam

Info

Publication number
DE2752202A1
DE2752202A1 DE19772752202 DE2752202A DE2752202A1 DE 2752202 A1 DE2752202 A1 DE 2752202A1 DE 19772752202 DE19772752202 DE 19772752202 DE 2752202 A DE2752202 A DE 2752202A DE 2752202 A1 DE2752202 A1 DE 2752202A1
Authority
DE
Germany
Prior art keywords
welding
stamp
heat
penetrates
bottom ply
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Withdrawn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
DE19772752202
Other languages
German (de)
Inventor
Heinz Hinterseer
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.)
KIEFEL HOCHFREQUENZ PAUL
Original Assignee
KIEFEL HOCHFREQUENZ PAUL
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Publication date
Application filed by KIEFEL HOCHFREQUENZ PAUL filed Critical KIEFEL HOCHFREQUENZ PAUL
Priority to DE19772752202 priority Critical patent/DE2752202A1/en
Publication of DE2752202A1 publication Critical patent/DE2752202A1/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Withdrawn legal-status Critical Current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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7437—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc the tool being a perforating tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/38—Impulse heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time

Landscapes

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

Abstract

Thermoplastics, esp. polyolefin, films are (lap-)welded togehter, using a permanently heated welding stamp which penetrates the upper ply of 2 superposed film plies and also penetrates into the bottom ply sufficiently deeply to cause the resulting melt, displaced by, and oozing out at, its edges to be mixed together, which then cools and solidifies as the stamp is removed without application of pressure. Even and reliable welding is achieved. Equipment is relatively inexpensive. Weld seams need not be straight, practically any desired configuration being practicable. Depth of working stroke of the stamp can be adjusted.

Description

Verfahren und Vorrichtung zum Verschweißen von Kunststoff-Method and device for welding plastic

Folien Die Verschweißung von Folien aus thermoplastische Kunststoff hat in den letzten Jahrzehnten eine zunehmende wirtschaftliche Bedeutung erlangt.Foils The welding of foils made of thermoplastic material has gained increasing economic importance in the last few decades.

Allen bekannten Schweißverfahren ist gemeinsam, daß die beiden zu verschweißenden Folien im Bereich ihrer Kontaktflächen auf Schmelztemperatur erwärmt und anschließend unter Druck bis zum Erstarren der Schmelze gehalten werden.All known welding processes have in common that the two to welding foils are heated to melting temperature in the area of their contact surfaces and then kept under pressure until the melt solidifies.

Unterschiedlich sind dagegen die Verfahren, die angewandt werden, um die Folien im Bereich der gewünschten Schweißnähte zu erwärmen. Bei den bekannten Verfahren der Hochfrequenz- bzw.On the other hand, the procedures that are used are different to heat the foils in the area of the desired weld seams. With the known Method of high frequency resp.

Ultraschall-Schweißung werden beispielsweise die beiden Folien im Bereich der gewünschten Schweißnaht durch Ausnützung physikalischer Effekte annähernd gleichftrmig tiber den gesamten Querschnitt erwärmt, während die Kontaktflächen zwischen den Folien und den die Schweißnaht formendenen Werkzeugen 11 wesentlichen kalt bleiben, so daß sich ein Temperaturmaximum im Inneren des zu verschweißenden Querschnittes, also etwa an der Kontaktfläche zwischen beiden Folien, einstellt.Ultrasonic welding, for example, the two foils in the Approximate area of the desired weld seam by utilizing physical effects uniformly heated over the entire cross-section, while the contact surfaces between the foils and the tools 11 forming the weld seam stay cold, so that there is a temperature maximum inside the to be welded Cross-section, so approximately at the contact surface between the two films, sets.

Leider ist die Anwendungsmöglichkeit der beiden genannten Verfahren beschränkt, und zwar: Bei der Hr-Schweißung auf wenige hierfflr geeignete Materialien, bei der Ultraschallschweißung insbesondere hinsichtlich Größe und Form der Schweißwerkzeuge Für Materialien, die eine Wärmeerzeugung in ihrem Inneren nicht zulassen, mußten Verfahren gefunden werden, die mit einer Wärmezufuhr von den Außenflächen der Folien her arbeiten.Unfortunately, the two methods mentioned can be used limited, namely: When welding to a few suitable materials, in the case of ultrasonic welding, in particular with regard to the size and shape of the welding tools For Materials that do not allow heat to be generated inside had to have processes can be found that work with a supply of heat from the outer surfaces of the foils.

Hierbei bereitet die schlechte Wärmeleitfähigkeit der Kunststoffmaterialien Schwierigkeiten, die dazu ftihrt, daß das Material an den Außenflächen im Bereich der heißen Schweißwerkzeuge aufschmilzt und nach den Seiten verdrängt wird, bevor die eigentliche Kontaktfläche zwischen den beiden Folien die Schmelztemperatur erreicht hat. Auch ist mit einem dauerbeheisten Schweißwerkzeug ein Abkühlen der Schweißnaht unter Druck naturgemäß nicht möglich.This is due to the poor thermal conductivity of the plastic materials Difficulty causing the material to stick to the outer surfaces in the area of the hot welding tools melts and is displaced to the sides before the actual contact area between the two foils reaches the melting temperature Has. The weld seam can also be cooled with a permanently heated welding tool Naturally not possible under pressure.

Diese Probleme werden Bit dem bekannten Wärmeimpuls-Schweißverfahren sowie dem Thermokontaktverfahren (DPA Nr. 26 23 005), bei denen eine impulsartige Aufheizung durch eine hitzebeständige Zwischenschicht hindurch erfolgt, die anschließend als Druckelement während der Abkühlung der Schweißzone dient, umgangen.These problems become bit the well known thermal pulse welding process as well as the thermal contact method (DPA No. 26 23 005), in which a pulse-like Heating takes place through a heat-resistant intermediate layer, which is then carried out serves as a pressure element during the cooling of the welding zone, bypassed.

Der Nachteil des Wärmeimpuls-Verfahrens ist, daß es nur auf gerade Schweißnähte anwendbar ist, während das Thermokontaktverfahren einen erheblichen maschinellen Aufwand bedingt.The disadvantage of the heat pulse method is that it only works on straight lines Welds are applicable, while the thermal contact process is a significant machine effort required.

Ziel der vorliegenden Anmeldung war o es nach, ein Verfahren zu finden, das in wirtschaftlicher Weise die Herstellung beliebig geformter Schweißnähte an Folien aus thermoplastischen Kunststoffen, insbesondere aus Polyolefinen, gestattet.The aim of the present application was o after to find a method the economical way to produce weld seams of any shape Films made from thermoplastics, in particular from polyolefins, are permitted.

Das erfindungsgemäße Verfahren arbeitet, wie Abb. 1 veranschaulicht, in der Weise, daß während einer kurzen Zeit ein dauerbeheizter Schweißstempel (2) auf die obere (5) zweier übereinander liegender Folienlagen unter Druck (1) aufgesetzt wird, wobei das Herausquellen des verdrängten Materials (3 und 4) an den Rindern des Schweißetempels bewußt in Kauf genommen wird.The method according to the invention works, as illustrated in Fig. 1, in such a way that a permanently heated welding stamp (2) placed on the upper (5) of two superimposed film layers under pressure (1) the swelling of the displaced material (3 and 4) on the cattle of the welding temple is consciously accepted.

Die Eindringtiefe des Schweißstempels wird durch geeignete Mittel, etwa eine mechanische Abstandsbegrenzung, so eingestellt, daß der Schweißstempel die obere Folienlag@ gänzlich durchdringt und noch zum Teil in die untere Lage eindringt.The penetration depth of the welding punch is determined by suitable means, about a mechanical distance limiter, adjusted so that the welding punch completely penetrates the upper layer of film @ and still partially penetrates into the lower layer.

Durch diesen Vorgang entsteht eine intensive Durcheischung der verdrängten Anteile der beiden Folienlagen, die nach dem Abheben des Schweißstempels eine sichere Verbindung der beiden Folienlagen ähnlich einer Vernietung, gewährleistet, ohne daß eine Abkühlung der Schweißzone unter Druck erforderlich wird.This process creates an intensive mixing of the displaced Proportions of the two layers of film that are safe after the welding stamp has been lifted off Connection of the two film layers similar to riveting, guaranteed without that a cooling of the welding zone under pressure is necessary.

Ein besonderer Vorteil des Verfahrens besteht darin, daß die Wärme nicht durch Wärmeleitung durch die obere Folienlage bis zur Schweißstelle transportiert werden muß, so daß auch stärkere Folien bsw. Platten verschweißt werden können.A particular advantage of the process is that the heat not transported by heat conduction through the upper layer of film to the welding point must be, so that even stronger foils bsw. Plates can be welded.

Die Vorrichtung zur Anwendung des Verfahrens besteht aus einer ebenen Tischplatte (7), auf die die beiden zu verschweißenden Folienlagen (5 und 6) übereinander aufgelegt werden, sowie einer darüber angeordneten ebenen Heizplatte (8), an deren Unterseite ein Schweißstempel (2) befestigt ist, dessen Kontur dem gewünschten Nahtbild entspricht. Die Heizplatte ist in einer geeigneten Führung parallel geführt und kann iit Hilfe einer entsprechenden Vorrichtung, beispielsweise eines Luftzylinders, gegen die Tischplatte bewegt werden.The device for applying the method consists of a plane Table top (7) on which the two layers of film to be welded (5 and 6) are stacked are placed, as well as a flat heating plate (8) arranged above it, on whose A welding stamp (2) is attached to the underside, the contour of which corresponds to the desired seam pattern is equivalent to. The heating plate is guided in parallel in a suitable guide and can i with the help of an appropriate device, for example an air cylinder, be moved against the table top.

Weiter ist eine einstellbare Abstandebegrenzung zur Regulierung der Eindringtiefe vorgesehen. Die elektrische Steuerung der Vorrichtung ist so gestaltet, daß der Schweißstempel sofort nach Erreichen der gewünschten Eindringtiefe wieder aus der Schweißstelle herausgezogen wird. Sie enthält außerdem eine Vorrichtung zur thermostatischen Regelung der heizplattentemperatur Da die Verbindung zwischen den beiden Kunststoff-Folien vornehalich in den Randzonen der durch das Eindringen des Schweißwerkzeuges erzeugten Prägung erfolgt, ist es zweckmäßig, durch entsprechende Unterteilung des Schweißsteges die Dmfangslänge zu vergrößern.There is also an adjustable distance limit to regulate the Penetration depth provided. The electrical control of the device is designed in such a way that that the welding stamp immediately after reaching the desired penetration depth again is pulled out of the weld. It also contains a device for thermostatic control of the heating plate temperature Because the connection between the two plastic films, primarily in the edge zones of the through the Penetration of the welding tool generated embossing takes place, it is useful through appropriate subdivision of the welding bar to increase the circumferential length.

Eine Verbesserung des Aussehens der Schweißnaht sowie der Nahtfestigkeit kann erreicht werden, wenn die Schweißnaht unmitt@lbar nach dem Abheben des Schweißstempels durch einen kalten Steg zusammengedrückt wird. Dieses Verfahren ist insbesondere dann anwendbar, wenn endlose Bahnen von der Rolle verarbeitet werden, so daß der Nachdruckvorgang eine Station hinter der Schweißstation durchgeführt werden kann.An improvement in the appearance of the weld seam as well as the seam strength can be achieved if the weld seam is made immediately after the welding stamp has been lifted off is compressed by a cold bar. This procedure is particular then applicable when endless webs are processed from the roll, so that the Reprinting process can be carried out one station behind the welding station.

L e e r s e i t eL e r s e i t e

Claims (1)

P a t e n t a n s p r ü c h e Anspruch 1 Vorfahren und Vorrichtung zum Verschweißon von Folien aus thermoplastischen Kunststoffen insbesondere Polyolefinen, d a d u r c h g e k e n n z e i c h n e t, daß ein dauerbeheizter Schweißstempel (2) die obere Lage (S) zveier aufeinander liegender Folienbahnen durchdringt und soweit in die unter Lage (6) eindringt, daß das an seinen Mindern austretende, verdrängte, aufgschmolzene Material (3 und 4) beider Lagen sich verlischt und nach de@ Wegnehmen des Schweißstempels ohne Anwendung von äußere@ Druck abkühlt.P a t e n t a n s p rü c h e claim 1 ancestors and device for welding foils made of thermoplastics, especially polyolefins, d u r c h e k e n n n z e i c h n e t that a permanently heated welding stamp (2) the upper layer (S) penetrates two sheets of film lying on top of one another and penetrates so far into the under position (6) that the emerging at its minor, displaced, Melted material (3 and 4) of both layers goes out and after de @ removal of the welding die cools down without the application of external @ pressure. Anspruch 11 Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Schweißstempel zur Vergrdßerung der Lange seiner Randzonen in geeigneter Weise unterteilt ist.Claim 11 method according to claim 1, characterized in that the welding punch to increase the length of its edge zones in a suitable manner is divided. Anspruch III Verfahren und Vorrichtung nach Ansprüchen 1 bis II, dadurch gekennzeichnet, daß die nach Anspruch 1 hergestellte Schweißnaht unmittelbar nach dz Austreten des Schweißwerkzeuges durch einen kalten Druckstempel flachgedrückt wird.Claim III Method and device according to Claims 1 to II, characterized characterized in that the weld seam produced according to claim 1 immediately after dz exit of the welding tool flattened by a cold pressure stamp will.
DE19772752202 1977-11-23 1977-11-23 Heat-welding polyolefin films - with heated punch that wholly penetrates top but only partly bottom ply to use squeezed-out melt for forming seam Withdrawn DE2752202A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772752202 DE2752202A1 (en) 1977-11-23 1977-11-23 Heat-welding polyolefin films - with heated punch that wholly penetrates top but only partly bottom ply to use squeezed-out melt for forming seam

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DE19772752202 DE2752202A1 (en) 1977-11-23 1977-11-23 Heat-welding polyolefin films - with heated punch that wholly penetrates top but only partly bottom ply to use squeezed-out melt for forming seam

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DE2752202A1 true DE2752202A1 (en) 1979-06-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4557782A (en) * 1983-11-10 1985-12-10 At&T Technologies, Inc. Methods of securing an adhesive strip to a carrier
US7967934B2 (en) * 2006-09-06 2011-06-28 Brady Worldwide, Inc. Method of attaching a label to a thermoplastic substrate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4557782A (en) * 1983-11-10 1985-12-10 At&T Technologies, Inc. Methods of securing an adhesive strip to a carrier
US7967934B2 (en) * 2006-09-06 2011-06-28 Brady Worldwide, Inc. Method of attaching a label to a thermoplastic substrate

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