DE2935356A1 - High frequency welding rig - for planar articles using dielectric spacer between electrodes as thrust element - Google Patents

High frequency welding rig - for planar articles using dielectric spacer between electrodes as thrust element

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Publication number
DE2935356A1
DE2935356A1 DE19792935356 DE2935356A DE2935356A1 DE 2935356 A1 DE2935356 A1 DE 2935356A1 DE 19792935356 DE19792935356 DE 19792935356 DE 2935356 A DE2935356 A DE 2935356A DE 2935356 A1 DE2935356 A1 DE 2935356A1
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DE
Germany
Prior art keywords
electrodes
field electrodes
high frequency
welding
insulating material
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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.)
Granted
Application number
DE19792935356
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German (de)
Other versions
DE2935356C2 (en
Inventor
Dieter Ing.(grad.) 6704 Mutterstadt Butterfass
Karl 6700 Ludwigshafen Gans
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BASF SE
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BASF SE
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Priority to DE2935356A priority Critical patent/DE2935356C2/en
Publication of DE2935356A1 publication Critical patent/DE2935356A1/en
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Publication of DE2935356C2 publication Critical patent/DE2935356C2/en
Expired legal-status Critical Current

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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
    • 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
    • B29C66/40—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
    • B29C66/45—Joining of substantially the whole surface of the 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81262—Electrical and dielectric properties, e.g. electrical conductivity
    • B29C66/81263—Dielectric properties
    • 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
    • B29C66/818—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81871—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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
    • 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
    • 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
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

A welding device for planar structural articles such as mats, plastic foils, foam and plastic coated materials by high-frequency energy consists of two field electrodes above a solid base, made of insulating material, towards which the electrodes can be moved. The space between the two field electrodes is filled up with a body of insulating material. This creates a better dielectric strength between the electrodes. A uniform and stable weld is now ensured over long distances.

Description

Vorrichtung zum HochfrequenzverschweißenDevice for high frequency welding

von Flächengebilden Die Erfindung bezieht sich auf eine Vorrichtung zum Verschweißen von verschieden strukturierten Flächengebilden mit Hochfrequenzenergie, bestehend aus zwei räumlich im Abstand nebeneinander angeordneten Feldelektroden, die an einen Hochfrequenz-Schweißgenerator angeschlossen sind, und einer ortsfesten Unterlage aus Isolationswerkstoff für die zu verschweißenden Flächengebilde, zu der die Feldelektroden bewegbar sind.of flat structures The invention relates to a device for welding differently structured flat structures with high frequency energy, consisting of two field electrodes arranged spatially next to each other, which are connected to a high frequency welding generator, and a stationary one Pad made of insulation material for the flat structures to be welded which the field electrodes are movable.

Zum Verschweißen von verschieden strukturierten Flächengebilden, wie Vliese, Vliesstoffe, Kunststoffolien, Schaumstoffe, kunststoffbeschichtete Materialien miteinander und untereinander werden häufig Elektrodenanordnungen verwendet, die aus zwei übereinander angeordneten Elektroden bestehen, von denen die eine ortsfest und die andere zu dieser bewegbar ist. Während des Schweißvorganges werden die miteinander zu verschweißenden Flächenteile an der Verbindungsstelle zur Erzeugung des notwendigen Schweißdruckes von der bewegbaren Feldelektrode gegen die ortsfeste gepreßt. Dabei wird die Dicke der zu verbindenden Flächenteile und damit der Abstand zwischen den Elektroden verringert, so daß es insbesondere bei Inhomogenitäten im Material, beispielsweise bei Einschlüssen von wasser oder Masserdampf, zu Durchschlägen," verursacht durch Spannu ngsdurchbruch kommen kann An diesen Stellen ist dann das verschweißte X'aterial deformiert und oft auch verbrannt.For welding differently structured flat structures, such as Nonwovens, nonwovens, plastic films, foams, plastic-coated materials electrode arrangements are often used with one another and with one another, which consist of two electrodes arranged one above the other, one of which is stationary and the other is movable to this. During the welding process, the to be welded surface parts at the connection point to generate the necessary Welding pressure pressed by the movable field electrode against the stationary one. Included becomes the thickness of the surface parts to be connected and thus the distance between the Electrodes reduced, so that it is particularly inhomogeneities in the material, for example at Inclusions of water or steam, to breakdowns, " caused by voltage breakdown Welded X'material is deformed and often also burned.

Es ist schon versucht worden mit Hilfe einer aus dem Fachbuch "G.F. Abele, EF-Schzeißtechnlk, Zechner & Hüthig Verlag 1965, Abschn. XIII.4" bekannten Elektrodenanordnung Abhilfe zu schaffen. Die beiden Feldelektroden sind auf einer Seite der zu verbindenden Flächenteile im Abstand nebeneinander angeordnet, so daß der Elektrodenabstand während des Schweißvorganges konstant bleibt. Die Feldlinien verlaufen vorwiegend im Schweißgut.It has already been tried with the help of one from the textbook "G.F. Abele, EF-Schzeißtechnlk, Zechner & Hüthig Verlag 1965, Section XIII.4 "known Electrode arrangement to provide a remedy. The two field electrodes are on one Side of the surface parts to be connected arranged at a distance next to one another, so that the electrode spacing remains constant during the welding process. The field lines run predominantly in the weld metal.

Eine gewisse Verbesserung konnte damit erreicht werden. Das Di#elektrikum Lurt jedoch zwischen den nebeneinander angeordneten Feldelektroden unterliegt in seinen elektrischen Kennwerten durch Umwelteinflusse, wie Feuchtigkeit, Staubpartikel, chemische Verunreinigungen usw., Schwankungen, so daß verschiedentlich Überschläge an der Luftstrecke aufgetreten sind. Ferner fehlt die Möglichkeit, im Bereich der stärksten Erhitzung des Schweißgutes in Höhe des Elektroden zwischenraumes Druck auf die Schweißstelle auszuüben.A certain improvement could thus be achieved. The Di # elektrikum Lurt, however, is subject to in between the field electrodes arranged next to one another its electrical characteristics due to environmental influences such as moisture, dust particles, chemical impurities, etc., fluctuations, so that various flashovers occurred in the air gap. Furthermore, there is no option in the area of strongest heating of the weld metal at the level of the pressure between the electrodes to exert on the weld.

Der Erfindung liegt die Aufgabe zugrunde, eine Schweißvorrichtung der eingangs beschriebenen Art zu schaffen, mit der die Schweißverbindungen in ihrer Qualität verbessert und wirtschaftlicher hergestellt werden können.The invention is based on the object of a welding device to create the type described above, with which the welded joints in their Quality can be improved and manufactured more economically.

Die Lösung dieser Aufgabe besteht darin, daß der Raum zwischen den beiden Feldelektroden durch einen Körper aus Isolationswerkstoff ausgefüllt ist. Dabei ist es vorteilhaft, den Körper an den beiden Feldelektroden zu befestige, und als Anpreßelement auszubilden.The solution to this problem is that the space between the two field electrodes is filled by a body made of insulating material. It is advantageous to attach the body to the two field electrodes, and to be designed as a pressure element.

Durch die Einfügung des Isolationskörpers zur verbesserten Isolation zwischen den Feldelektroden und als Anpreßelement an den Schweißstellen ist es möglich geworden, die Schweißvorrichtung der eingangs genannten Art mit Vorteilen großtechnisch zu nutzen. Der Abstand zwischen den Elektroden ist konstant und unabhängig von der Stärke und Form der zu verbindenden Flächengebilde, so daß auch über größere Längen eine außerordentlich gleichmßige und stabile Verschweißung erzielt werden kann. Durch die einseitige Einspeisung der Hochfrequenzenergie entsprechend der Elektrodenanordnung wird das Schweißgut nicht mehr in seiner gesamten Stärke erhitzt, so daß Deformationen und Veränderungen der Oberflächenstruktur auf der den Feldelektroden abgewandten Warenrückseite -unterbleiben. Ferner ist ein Durchbrennen der Ware vermieden. Durch die Konzentration des Energieflusses auf die den Schweißverbindungsstellen benachbarten Materialschichten läuft der Schweißvorgang schneller ab, wodurch gegenüber den herkömmlichen Schweißgeräten sowohl Energie als auch Zeit gespart und damit wirtschaftlicher als bisher gearbeitet werden kann.By inserting the insulation body for improved insulation It is possible between the field electrodes and as a pressure element at the welds become the welding device of the type mentioned with advantages on an industrial scale to use. The distance between the electrodes is constant and independent of the Thickness and shape of the flat structure to be connected, so that even over greater lengths an extremely uniform and stable weld can be achieved. Due to the one-sided feeding of the high-frequency energy according to the electrode arrangement the weld metal is no longer heated in its entire thickness, so that deformations and changes in the surface structure on the one facing away from the field electrodes The back of the goods is not required. Burning through of the goods is also avoided. By the concentration of the energy flow on the areas adjacent to the weld joints The welding process runs faster than the conventional layers of material Welding machines save both energy and time and are therefore more economical than can be worked so far.

In der Zeichnung ist ein Ausführungsbeispiel der erfindungsgemäßen Schweißvorrichtung schematisch dargestellt und nachfolgend erläutert.In the drawing is an embodiment of the invention Welding device shown schematically and explained below.

Die beiden Feldelektroden 1 und 2 sind auf einer Seite der zu verschweißenden Flächengebilde 3 und 4 nebeneinander und parallel zueinander angeordnet. Als Flächengebilde kommen alle durch Plasterwärmung verschweißbaren Materialien verschiedenster Strukturen, insbesondere die eingangs erwähnten in Betracht. Die Feldelektroden 1 und 2 bestehen vorzugsweise aus Messing und sind an die jeweiligen Ausgangsklemmen eines Hochfrequenzgenerators 5 angeschlossen. Die zu verschweißenden Flächengebilde 3 und 4 ruhen, je nach Verar- beitungszçeck ganz oder teilweise überlappend, auf einer mit der Gerätegrundplatte fest verbundenen Unterlage 6 aus Isolierwerkstoff.The two field electrodes 1 and 2 are on one side of the one to be welded Flat structures 3 and 4 arranged next to one another and parallel to one another. As a flat structure all materials of various structures that can be welded by warming plaster come, in particular those mentioned at the outset can be considered. The field electrodes 1 and 2 are made preferably made of brass and are connected to the respective output terminals of a high-frequency generator 5 connected. The planar structures 3 and 4 to be welded rest, depending on the processing working purpose completely or partially overlapping, on a firmly connected to the device base plate Base 6 made of insulating material.

Der Raum zwischen den beiden Feldelektroden 1 und 2 ist zur Vermeidung von überschlagen an der Luftstrecke durch einen Körper 7 aus Isolationswerkstoff ausgefüllt. Er ist vorzugsweise mit den Elektroden fest verbunden, beispielsweise durch Verkleben oder Verschweißen oder aber durch Schraubenverbindungen, wobei die Schrauben ebenfalls aus Isolierwerkstoff bestehen. Zum Beispiel können die Schrauben in Bohrungen jeweils einer Elektrode geführt und dann in den Körper 7 einzesçhraubt sein, oder aber die gesamte Anordnung Elektrode-Isolationskörper-Elektrode ist durch Schrauben und Muttern zusammengespannt. Bei Schraubenverbindungen ist zu beachten, daß zur Verhinderung von Übersehlen Luftspalte in den Bohrungen des Isolationskörpers 7 möglichst vermieden sind.The space between the two field electrodes 1 and 2 is for avoidance of rollover at the air gap by a body 7 made of insulating material filled out. It is preferably firmly connected to the electrodes, for example by gluing or welding or by screw connections, the Screws are also made of insulating material. For example, the screws can guided in bores of one electrode each and then screwed into the body 7 be, or the entire arrangement of electrode-insulator-electrode is through Bolts and nuts clamped together. In the case of screw connections, it is important to that to prevent overselling air gaps in the bores of the insulation body 7 are avoided as far as possible.

Der Körper 7 dient außerdem als Anpreßelement für die Schweißstelle der zu verbindenden Flächengebilde 3 und 4, weshalb er zu diesen hin über die Unterkante der Feldelektroden 1 und 2 hervorsteht. Dieser Teil des Körpers ist zweckmäßigerweise in seiner Geometrie und seinen Abmessungen entsprechend dem gewünschten Schweißprofil ausgebildet.The body 7 also serves as a pressing element for the weld the fabric to be connected 3 and 4, which is why it goes to this over the lower edge of the field electrodes 1 and 2 protrudes. This part of the body is expedient in its geometry and dimensions according to the desired welding profile educated.

Bei der Wahl des Isolierwerkstoffs, insbesondere für den Körper 7 und die darin eingeschlossenen Teile, wie Schrauben, ist zu beachten, daß die Feldlinien, die möglichst im Schweißgut verlaufen sollen, vorwiegend im Dielektrikum der höheren Dielektrizitätskonstante verlaufen. Ferner ist zu berücksichtigen, daß die Erweichungstemperatur des Isolierwerkstoffes höher liegt als die des zu verschweißenden Materials. Bei den üblicherweise zu verarbeitenden Materialien werden diese Forderungen im allgemeinen von Kunststoffen aus Polystyrol, L J Polyäthylen, Polypropylen, insbesondere Polytetrafluoräthylen, erfüllt.When choosing the insulating material, especially for the body 7 and the parts enclosed in it, such as screws, must be observed that the field lines, which should run as far as possible in the weld metal, mainly in the dielectric of the higher one Dielectric constant run. It should also be taken into account that the softening temperature of the insulating material is higher than that of the material to be welded. at The materials to be processed usually meet these requirements of plastics made of polystyrene, L J Polyethylene, polypropylene, especially polytetrafluoroethylene, met.

Der für die Verschweißung maßgebliche Feldlinienverlauf hängt außer von den Eigenschaften, Abmessungen und dem Aufbau des zu verschweißenden Materials und des Körpers 7 von der Geometrie und den Abmessungen der Feldelektroden sowie von deren gegenseitigen Abstand ab. Ferner ist für die Güte der Verschweißung die optimale Einstellung der Schweißzeit und Feldstärke entscheidend.The course of the field lines, which is decisive for the welding, also depends on the properties, dimensions and structure of the material to be welded and of the body 7 on the geometry and the dimensions of the field electrodes as well on their mutual distance. Furthermore, for the quality of the weld, the optimal setting of the welding time and field strength are decisive.

Die übrigen Teile der Schweißvorrichtung, die in der Zeichnung nicht dargestellt sind, entsprechen denen von herkömmlichen Geräten dieser Art. So sind die Feldelektroden 1 und 2 an Halterungen voneinander isoliert auswechselbar befestigt. Die Auswechselbarkeit kann beispielsweise durch geeignete Schraubenverbindungen oder durch bekannte, betätigbare Klemmverbindungen oder Einrastmechanismen realisiert sein. Die Halterung steht mit einer mechanisch oder pneumatisch bzw. hydraulisch betätigbaren Hubeinrichtung in Verbindung, mit deren Hilfe die Feldelektroden 1 und 2 auf die Schweißstelle zufahrbar sind. Bevorzugt sind dabei solche Einrichtungen, bei denen der Anpreßdruck voreinstellbar ist. Halterung und Hubeinrichtung sind in der Zeichnung durch das Bezugszeichen 8 angedeutet.The remaining parts of the welding device that are not in the drawing are shown correspond to those of conventional devices of this type. So are the field electrodes 1 and 2 attached to brackets insulated from one another and exchangeably. The interchangeability can, for example, by means of suitable screw connections or realized by known, actuatable clamping connections or latching mechanisms be. The bracket is available with a mechanical or pneumatic or hydraulic actuatable lifting device in connection, with the help of which the field electrodes 1 and 2 are approachable to the welding point. Such facilities are preferred where the contact pressure can be preset. Bracket and lifting device are indicated in the drawing by the reference number 8.

Beispiel Ein Bodenbelag einer Stärke von ca. 6 mm aus Polypropylenfasern wurde mit einer 0,5 mm starken PVC-Weichfolie verschweißt. Der Elektrodenabstand und damit die Breite des Isolationskörpers 7 aus Polytetrafluoräthylen, der mit 100 kp auf das Schweißgut gepreßt wurde, betrug 1,5 mm.Example A floor covering approx. 6 mm thick made of polypropylene fibers was welded to a 0.5 mm thick soft PVC film. The electrode gap and thus the width of the insulation body 7 made of polytetrafluoroethylene, with 100 kp was pressed onto the weld metal, was 1.5 mm.

Die Elektrodenbreite war mit 200 mm bemessen. Der Elektrodenstrom des Hochfrequenzgenerators (27,12 MHz) lag bei L 4 Ampere. Nach einer Schweißzeit von 10 sec. konnte eine gute und gleichmäßige Verschweißung in Form einer Linie mit einer Breite von 1,5 mm nachgewiesen werden. Die Schweißzeit lag gegenüber herkömmlichen Geräten bei vergleichbaren Schweißergebnissen um die Hälfte niedriger.The electrode width was measured at 200 mm. The electrode current of the high frequency generator (27.12 MHz) was at L. 4 amps. To a welding time of 10 sec. a good and even welding in Form a line with a width of 1.5 mm can be detected. The welding time compared to conventional devices with comparable welding results was around Half lower.

Durch das neue Verfahren besteht auch die Möglichkeit, Weich- oder Hart-PVC-Schaum sowie Polyurethan-Schaum ohne Volumenminderung an der Schweißnaht zu verschweißen.The new process also offers the option of soft or Rigid PVC foam and polyurethane foam without reducing the volume at the weld seam to weld.

Zeichn. 11 LeerseiteSign. 11 Blank page

Claims (2)

Patentansprüche 2. Vorrichtung zum Verschweißen von verschieden strukturierten Flächengebilden mit Hochfrequenzenergie, bestehend aus zwei räumlich im Abstand nebeneinander angeordneten Feldelektroden, die an einen Hochfrequenz--Schweißgenerator angeschlossen sind, und einer ortsfesten Unterlage aus Isolationswerkstoff für die zu verschweißenden Flachengebilde, zu der die Feldelektroden bewegbar sind, dadurch gekennzeichnet, daß der Raum zwischen den beiden Feldelektroden (1 und 2) durch einen Körper (7) aus isolationswerkstoff ausgefüllt ist. Claims 2. Device for welding differently structured Flat structures with high frequency energy, consisting of two spatially spaced apart side-by-side field electrodes connected to a high frequency welding generator are connected, and a stationary pad made of insulating material for the flat structures to be welded, to which the field electrodes can be moved, thereby characterized in that the space between the two field electrodes (1 and 2) by a body (7) made of insulating material is filled. 2 Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Körper (7) an den beiden Feldelektroden (1 und 2) befestigt und als Anpreßelement ausgebildet ist. 2 Device according to claim 1, characterized in that the body (7) attached to the two field electrodes (1 and 2) and designed as a pressure element is.
DE2935356A 1979-09-01 1979-09-01 Device for high-frequency welding of flat structures Expired DE2935356C2 (en)

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DE2935356A DE2935356C2 (en) 1979-09-01 1979-09-01 Device for high-frequency welding of flat structures

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DE2935356A1 true DE2935356A1 (en) 1981-03-26
DE2935356C2 DE2935356C2 (en) 1983-02-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704177A1 (en) * 1993-04-23 1994-10-28 Renault Method and device for rapidly polymerising an adhesive bond using high-frequency welding
DE102013008293A1 (en) * 2013-05-15 2014-11-20 Johnson Controls Gmbh Method and device for applying at least one decorative strip on a seat cover
DE102023106669A1 (en) 2023-03-16 2024-09-19 Kiefel Gmbh High frequency welding tool for dielectric welding of thermoplastic workpieces resting on a base plate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G.F. Abele, HF Schweißtechnik, Zechner + Hüthig Verlag, 1965, Kap. X III. 4 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704177A1 (en) * 1993-04-23 1994-10-28 Renault Method and device for rapidly polymerising an adhesive bond using high-frequency welding
DE102013008293A1 (en) * 2013-05-15 2014-11-20 Johnson Controls Gmbh Method and device for applying at least one decorative strip on a seat cover
DE102013008293B4 (en) * 2013-05-15 2017-07-13 Adient Luxembourg Holding S.à.r.l. Method and device for applying at least one decorative strip on a seat cover
US9969123B2 (en) 2013-05-15 2018-05-15 Johnson Controls Gmbh Method and device for applying at least one decorative strip to a seat cover
DE102023106669A1 (en) 2023-03-16 2024-09-19 Kiefel Gmbh High frequency welding tool for dielectric welding of thermoplastic workpieces resting on a base plate

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