DE1297849B - Device for welding a load-bearing with at least one cover film layer made of thermoplastic materials lying on it - Google Patents
Device for welding a load-bearing with at least one cover film layer made of thermoplastic materials lying on itInfo
- Publication number
- DE1297849B DE1297849B DEP19642A DE1297849DA DE1297849B DE 1297849 B DE1297849 B DE 1297849B DE P19642 A DEP19642 A DE P19642A DE 1297849D A DE1297849D A DE 1297849DA DE 1297849 B DE1297849 B DE 1297849B
- Authority
- DE
- Germany
- Prior art keywords
- welding
- electrode
- bearing
- load
- cover film
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims description 33
- 239000013039 cover film Substances 0.000 title claims description 5
- 239000012815 thermoplastic material Substances 0.000 title claims description 4
- 238000000034 method Methods 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims 1
- 239000010408 film Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
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
- B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
-
- 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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
- B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/112—Single lapped joints
- B29C66/1122—Single lap to lap joints, i.e. overlap joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
- B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Description
Die Erfindung bezieht sich auf eine Vorrichtung zum Verschweißen einer tragenden mit mindestens einer auf dieser liegenden Deckfolienschicht aus thermoplastischen Werkstoffen für Gehäuseteile der Nachrichtentechnik, bei der die Schichten beim Schweißvorgang an der Schweißnaht zusammengepreßt und durch eine Elektrode mit einer Schweißfläche verschweißt und mit einer Abscherkante an dieser Elektrode in einem Arbeitsgang abgeschnitten werden. The invention relates to a device for welding a load-bearing with at least one cover film layer lying on it thermoplastic materials for housing parts in communications engineering, in which the Layers pressed together during the welding process at the weld seam and through a Electrode welded to a welding surface and with a shear edge on this Electrode can be cut off in one operation.
Es ist bekannt, Gehäuseteile von elektrischen Nachrichtengeräten, insbesondere Rundfunk-Klein empfängern, aus Kunststoffplatten bzw. versteiften Kunststoffolien herzustellen. Auf das Gehäuseteil bzw. eine harte Grundfolie werden dabei beispielsweise eine Schaumstoffolie und eine diese bedeckende, meist lederartig genarbte Weichfolie aufgeschweißt Die Verschweißung erfolgt dabei im Hochfrequenzfeld zwischen einer die übereinandergelegten Schichten tragenden, meist feststehenden Schweißelektrode, und einer beweglichen Schweißelektrode, die auf die zu verschweißenden Folienränder aufgepreßt wird. Es ist jedoch schwierig, im Bereich der Schweißzone eine dauerhafte Haftung der Kunststoffschichten aneinander zu erzielen. Dies gilt vor allem dann, wenn unterschiedlich harte thermoplastische Kunststoffe miteinander zu verschweißen sind, worauf es bei der Herstellung von Gehäusen für Nachrichtengeräte häufig ankommt. Die weicheren Kunststoff- und Schaumstoffschichten lösen sich, wenn eine flüchtige Haftung überhaupt stattgefunden hat, nach kurzerZeitvon selbst oder bei dergeringstenBelastung wieder von den härteren Schichten ab. Um dieses unbefriedigende Ablösen von vornherein zu verhüten, wird nach dem Schweißen die weiche Deckfolie über den Rand geschlagen und auf der anderen Seite an der harten Schicht festgeklebt. Diese Herstellungsart ist aber unsauber und aufwendig. It is known to use housing parts of electrical communications equipment, in particular small radio receivers, made of plastic sheets or stiffened plastic sheets to manufacture. For example, on the housing part or a hard base film a foam sheet and a covering, mostly leather-like grained soft sheet welded on The welding takes place in the high frequency field between a the mostly fixed welding electrode carrying the superimposed layers, and a movable welding electrode that is placed on the foil edges to be welded is pressed on. However, it is difficult to get a permanent one in the area of the weld zone To achieve adhesion of the plastic layers to one another. This is especially true if thermoplastic plastics of different hardness have to be welded together are what is often important in the manufacture of enclosures for communications equipment. The softer plastic and foam layers come off when a volatile Liability has taken place at all, after a short period of time by itself or with the slightest burden back off the harder layers. About this unsatisfactory replacement from the start To prevent this, the soft cover film is folded over the edge after welding and glued to the hard layer on the other side. This manufacturing method but is unclean and expensive.
Es ist bereits eine Schweißvorrichtung bekannt, bei der an einer beweglichen Elektrode eine Abscherkante und eine senkrecht zur Schweißfläche verlaufende Wand vorhanden sind. Die Schweißfläche stößt aber nicht unmittelbar mit der Wand zusammen. Zwischen ihr und der Wand bleibt ein Zwischenraum, in dem ein Zierwulst erzeugt wird, in den sich entweichendes Material ergießen kann. It is already known a welding device in which on a movable electrode has a shear edge and one perpendicular to the welding surface Wall are present. However, the welding surface does not hit the wall directly together. Between it and the wall there is a space in which a decorative bead remains is generated into which escaping material can pour.
Bei einer anderen bekannten Elektrode, die ebenfalls zur Ziernahtbildung dient und die deshalb nicht bis auf die Gegenelektrode niedergefahren wird, verläuft die Scherkante schräg zum Schweißrand. Diese Konstruktion würde beim Einsetzen als Schneidelektrode zu unsauberen Schnitträndern führen. Darüber hinaus lassen die bekannten Elektroden nur einen begrenzten Schweißdruck zu, da ihr Niederfahrweg durch die Oberfläche der Gegenelektrode begrenzt wird. In another known electrode, which is also used to form decorative seams serves and which is therefore not run down to the counter electrode, runs the shear edge at an angle to the welding edge. This construction would when inserted as Lead the cutting electrode to unclean cut edges. In addition, the known electrodes only have a limited welding pressure, since their low travel is limited by the surface of the counter electrode.
Es ist Aufgabe der Erfindung, eine Schweißvorrichtung für Kunststoffolien zu schaffen, mit der haltbare und saubere Verschweißungen durchführbar sind. It is the object of the invention to provide a welding device for plastic films with which durable and clean welds can be carried out.
Die gestellte Aufgabe ist bei einer Vorrichtung zum Verschweißen einer tragenden mit mindestens einer auf dieser liegenden Deckfolienschicht aus thermoplastischen Werkstoffen für Gehäuseteile der Nachrichtentechnik, bei der die Schichten beim Schweißvorgang an der Schweißnaht zusammengepreßt und durch eine Elektrode mit einer Schweiß- fläche verschweißt und mit einer Abscherkante an dieser Elektrode in einem Arbeitsgang abgeschnitten werden, dadurch gelöst, daß gemäß der Erfindung die Gegenelektrode mit einer Aussparung zur Aufnahme der an der beweglichen Elektrode vorgesehenen Abscherkanten versehen ist. The task at hand is for a device for welding a load-bearing with at least one cover film layer lying on it thermoplastic materials for housing parts in communications engineering, in which the Layers pressed together during the welding process at the weld seam and through a Electrode with a welding welded surface and with a shear edge on this Electrode are cut off in one operation, solved in that according to the Invention the counter electrode with a recess for receiving the movable Electrode provided shear edges is provided.
Durch die Aussparung in der Gegenelektrode wird im Schweißzonenbereich ein Materialstau erzwungen, in dem die einzelnen Folienschichten soweit ineinander verzahnt verpreßt werden, daß eine feste Verbindung der Schichten untereinander erfolgt, auch ohne daß die Materialien unmittelbar miteinander verschmelzen. Besonders vorteilhaft und die Haftfestigkeit der Verbindung unterstützend wirkt sich dabei noch eine Folienschicht aus, die längs des Schweißrandes mit einer gerändelten Oberfläche versehen ist. Through the recess in the counter electrode, in the welding zone area a material jam is forced in which the individual film layers so far into one another are interlocked pressed that a firm connection of the layers with each other takes place without the materials merging directly with one another. Particularly advantageous and the adhesive strength of the connection has a supporting effect Another layer of film, which runs along the welding edge with a knurled surface is provided.
Beim Verschweißen werden die auf Übermaß zugeschnittenen Ränder der Schichten vor ihrem Zusammenpressen von der Abscherkante in an sich bekannter Weise auf Maß zugeschnitten. Damit wird gewährleistet, daß unmittelbar an der flußbegrenzenden Abscherkante in jedem Fall der volle Materialquerschnitt vorhanden ist und der gewünschte Stau auch sicher erzielt wird. When welding, the oversized edges of the Layers before they are pressed together from the sheared edge in a manner known per se Tailored to measure. This ensures that directly at the river-limiting The sheared edge always has the full cross-section of the material and the desired one Traffic jam is also safely achieved.
Die Erfindung wird an Hand der in der Zeichnung dargestellten Ausführungsbeispiele einer Schweißvorrichtung zur Durchführung des Verfahrens nach der Erfindung näher erläutert. The invention is based on the embodiments shown in the drawing a welding device for carrying out the method according to the invention in more detail explained.
Fig. 1 zeigt einen Ausschnitt aus einer Schweißvorrichtung zum Verschweißen von Folienschichten für ein Gehäuseteil vor dem Schneid- und Schweißvorgang; F i g. 2 zeigt den Ausschnitt nach F i g. 1 während des Schweißvorganges; Fig. 3 zeigt einen Ausschnitt aus einer anderen Ausführungsform der beweglichen Schweißelektrode nach der Erfindung. Fig. 1 shows a section from a welding device for welding of film layers for a housing part before the cutting and welding process; F i G. 2 shows the section according to FIG. 1 during the welding process; Fig. 3 shows a section from another embodiment of the movable welding electrode according to the invention.
Eine an sich bekannte Schweißvorrichtung ist mit zwei Elektroden 1, 3 versehen. Während sich die Elektrode 1 fest auf einem Arbeitstisch befindet, ist die Elektrode 3 in Richtung auf die Elektrode 1 niederfahrbar. Die Elektrode 3 ist mit einer Schweißfläche 5 versehen, an die sich ein in Vorschubrichtung überstehender Kragen 7 anschließt. In Vorschubrichtung wird die Schweißfläche 5 der Elektrode 3 von einer senkrecht zur Schweißfläche 5 verlaufenden Wand 9 des Kragens 7 begrenzt. Den Abschluß dieser Wand 9 bildet eine Abscherkante 11. Die fest montierte Gegenelektrode 1 ist mit einer Aussparungl3 versehen, die für den Kragen 7 als Auslauf dient. A welding device known per se is with two electrodes 1, 3 provided. While the electrode 1 is firmly on a work table, the electrode 3 can be moved down in the direction of the electrode 1. The electrode 3 is provided with a welding surface 5 to which a protruding in the feed direction Collar 7 connects. In the feed direction, the welding surface 5 becomes the electrode 3 bounded by a wall 9 of the collar 7 running perpendicular to the welding surface 5. The end of this wall 9 is formed by a shear edge 11. The fixedly mounted counter-electrode 1 is provided with a recess 13 which serves as an outlet for the collar 7.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1297849T | 1962-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1297849B true DE1297849B (en) | 1969-06-19 |
Family
ID=616876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEP19642A Pending DE1297849B (en) | 1962-06-19 | Device for welding a load-bearing with at least one cover film layer made of thermoplastic materials lying on it |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1297849B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1673783U (en) * | 1951-04-11 | 1954-03-18 | Lorenz C Ag | DEVICE FOR SEAM WELDING OF THERMOPLASTIC FILMS. |
-
0
- DE DEP19642A patent/DE1297849B/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1673783U (en) * | 1951-04-11 | 1954-03-18 | Lorenz C Ag | DEVICE FOR SEAM WELDING OF THERMOPLASTIC FILMS. |
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