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DE10152395A1 - High frequency welding unit for plastics, comprises two opposing electrodes, and an insulating layer between one electrode and the plastic - Google Patents

High frequency welding unit for plastics, comprises two opposing electrodes, and an insulating layer between one electrode and the plastic

Info

Publication number
DE10152395A1
DE10152395A1 DE10152395A DE10152395A DE10152395A1 DE 10152395 A1 DE10152395 A1 DE 10152395A1 DE 10152395 A DE10152395 A DE 10152395A DE 10152395 A DE10152395 A DE 10152395A DE 10152395 A1 DE10152395 A1 DE 10152395A1
Authority
DE
Germany
Prior art keywords
electrode
insulating layer
electrodes
plastic
layer
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.)
Granted
Application number
DE10152395A
Other languages
German (de)
Other versions
DE10152395B4 (en
Inventor
Rupert Gschwendtner
Eduard Rothbauer
Gerhard Wieser
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 GmbH
Original Assignee
Kiefel GmbH
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Filing date
Publication date
Application filed by Kiefel GmbH filed Critical Kiefel GmbH
Priority to DE10152395.5A priority Critical patent/DE10152395B4/en
Publication of DE10152395A1 publication Critical patent/DE10152395A1/en
Application granted granted Critical
Publication of DE10152395B4 publication Critical patent/DE10152395B4/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B29C66/40—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
    • B29C66/70—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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/735—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the extensive physical properties of the parts to be joined
    • B29C66/7352—Thickness, e.g. very thin
    • 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
    • B29C66/8122—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 composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/81429—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 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
    • B29C66/818—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
    • B29C66/8182—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 thermal insulating constructional aspects
    • B29C66/81821—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 thermal 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
    • B29C66/81—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
    • B29C66/80—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
    • B29C66/8124—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 structure of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81241—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 structure of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps being porous or sintered
    • 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
    • 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
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

An arrangement for high frequency welding plastic film material, comprises two opposing electrodes and an insulating layer between at least one electrode and the plastic film material. The film material is located between the electrodes, and at least one of the electrodes (4) has a thin ceramic insulating layer (5). The surface of the ceramic insulating layer has pores that contain polytetrafluoroethylene (PTFE), and the ceramic layer is connected to the electrode. The insulating layer is 20-80 mu m thick and at least one electrode consists of aluminum.

Description

Die Erfindung bezieht sich auf eine Vorrichtung für das HF- Schweißen von Kunststofffolien mit zwei einander gegenüberstehenden Elektroden, zwischen denen die zu verschweißenden Folien für den Schweißvorgang aufgenommen sind, wobei sich zwischen der Kunststofffolie und mindestens einer Elektrode eine Isolierschicht befindet. The invention relates to a device for HF Welding plastic sheets with two each other opposite electrodes, between which the ones to be welded Foils for the welding process are included, with between the plastic film and at least one electrode there is an insulating layer.

Bei vielen HF-Schweißungen werden Isolierbeilagen vorgesehen, die insbesondere bei Schweißungen mit Trennkannten Durchschläge verhindern sollen. Solche Isolierbeilagen befinden sich dann auf der Seite der Gegenelektrode. Diese Isolierbeilagen haben in erster Linie die Aufgabe einen Durchschlag bei Trennschweißungen zu verhindern und eine thermische Isolation zu bewirken. Bei extrem dünnen Folien ist jedoch die thermische Isolation wegen des auftretenden Wärmestaus nicht in dem Maße erwünscht wie bei der Schweißung von dicken Folien. Als extrem dünne Folien werden Folien von etwa 0,1 Millimeter Stärke angesehen. Bei solch dünnen Folien bewirkt die thermische Isolierung eine Verlagerung des Temperaturmaximums in die dem Isolierstoff benachbarte Folie oder sogar in den Isolierstoff und befindet sich somit nicht mehr an der Berührungsstelle beider Folien, wo der Schweißvorgang stattfinden soll oder sogar außerhalb der Folien. Folienstärken unter 0,1 Millimeter sind daher unter normalen Bedingungen nicht mehr zuverlässig zu schweißen. Insulation inserts are used for many HF welds provided, especially for welds with cutting edges To prevent breakthroughs. Such inserts are then on the side of the counter electrode. This Insulation inserts primarily have a breakthrough to prevent separation welding and a thermal Effect isolation. In the case of extremely thin foils, however thermal insulation due to the heat accumulation not to the extent desired for the welding of thick foils. As extremely thin foils, foils of about Viewed 0.1 millimeters thick. With such thin foils the thermal insulation causes a shift of the Temperature maximum in the film adjacent to the insulating material or even in the insulating material and is therefore no longer present the point of contact of both foils where the welding process to take place or even outside of the slides. film thicknesses under 0.1 millimeters are therefore under normal conditions can no longer be reliably welded.

Aufgabe der Erfindung ist es eine Vorrichtung für das HF- Schweißen insbesondere von extrem dünnen Folien bereitzustellen, bei der einerseits eine Verhinderung des Durchschlags insbesondere bei Trennschweißungen erzielt wird, die aber damit verbundene thermische Isolation nicht so hoch ausfällt, dass eine Temperaturverschiebung wegen eines Wärmestaus in der Isolierschicht stattfindet. The object of the invention is a device for the HF Welding especially of extremely thin foils To provide, on the one hand, prevention of breakdown is achieved in particular with separating welds, but associated thermal insulation is not as high, that a temperature shift due to a heat build-up in the insulating layer takes place.

Diese Aufgabe wird bei einer Vorrichtung der eingangs erläuterten Art erfindungsgemäß dadurch gelöst, dass mindestens eine Elektrode mit einer dünnen Isolierschicht aus Keramik beschichtet ist. This task is the beginning of a device explained type solved according to the invention in that at least an electrode with a thin insulating layer made of ceramic is coated.

Durch diese Ausgestaltung lässt sich eine sehr dünne Isolierschicht mit einer elektrischen Isolierung zur Verhinderung des Durchschlags insbesondere bei Trennschweißungen erzielen, die obendrein aber, besonders bei der Verschweißung extrem dünner Folien, nicht den üblichen thermischen Isolationseffekt aufweist. Im Gegensatz zur vorliegenden Erfindung sind in der Literatur Isolierstoffe, wie zum Beispiel Phenolharz-Hartpapiere, Polyesterfolien, Cellulose-Epoxyd-Papiere, Silikon-PTFE- Verbindungen, Gummi-Gummigewebetücher genannt, wobei sich bei diesen Isolierstoffen eine Dicke von 0,3 Millimeter bewährt hat. Diese Isolierdicke ist bereits für die Verschweißung von extrem dünnen Folien ungeeignet. This configuration allows a very thin one Insulating layer with electrical insulation to prevent the Achieve breakdown, particularly in the case of separating welds, on top of that, however, especially when it comes to welding thin foils, not the usual thermal insulation effect having. In contrast to the present invention are in the Literature insulating materials, such as Phenolic resin hard papers, polyester foils, cellulose epoxy papers, silicone PTFE Connections, called rubber-rubber tissue sheets, being these insulating materials have a thickness of 0.3 millimeters has proven. This insulation thickness is already for the Welding of extremely thin foils unsuitable.

Eine besonders vorteilhafte Weiterbildung der Erfindung besteht darin, dass die Oberfläche der Keramikschicht zumindest in Oberflächenporen PTFE-Einlagerungen aufweist. A particularly advantageous development of the invention is that the surface of the ceramic layer at least has PTFE inclusions in surface pores.

Diese besonders bevorzugte Isolierschicht weist nicht nur die bereits erwähnte hohe elektrische Isolierung auf, sondern erleichtert auch die Schweißbarkeit bei dünnen Folien, weil gegenüber dickeren Schweißunterlagen bekannter Art trotz vorhandener geringerer Wärmeleitfähigkeit gegenüber einer unbeschichteten Elektrode die Verschiebung des Temperaturmaximums in die untere Folie nicht stattfindet. Die PTFE-Einlagerungen verhindern das Ankleben des Schweißgutes am Werkzeug, so dass eventuell erforderliche Trennfolien oder mechanische Trennvorrichtungen eingespart werden können. This particularly preferred insulating layer not only has the already mentioned high electrical insulation, but also facilitates the weldability of thin foils because compared to thicker welding pads of a known type despite existing lower thermal conductivity compared to one uncoated electrode the displacement of the Temperature maximum does not take place in the lower film. The PTFE deposits prevent the weld metal from sticking to the Tool, so that any necessary separating foils or mechanical separators can be saved.

Je nach Einsatzbereich kann es vorteilhaft sein, die gesamte Oberfläche der Keramikschicht mit einer PTFE-Schicht zu beschichten. Depending on the area of application, it may be advantageous to use the entire Surface of the ceramic layer with a PTFE layer too coat.

Die Beschichtung der mindestens einen Elektrode mit der Keramikschicht wird so vorgenommen, dass die Keramikschicht mit der Elektrode innig verbunden ist. Hierdurch wird die Voraussetzung für die Ausbildung einer sehr dünnen Isolierschicht geschaffen, denn im Gegensatz zu den aufgelegten Isolierschichten, die schon aus Gründen der Eigenstabilität eine gewisse Dicke aufweisen müssen, ist hier die Isolierschicht fest mit der Oberfläche der Elektrode verbunden. The coating of the at least one electrode with the Ceramic layer is made so that the ceramic layer is intimately connected to the electrode. This will make the Prerequisite for training a very thin Insulating layer created, because in contrast to the applied Insulating layers, which for reasons of inherent stability must have a certain thickness, here is the insulating layer firmly connected to the surface of the electrode.

In vorteilhafter weiterer Ausgestaltung der Erfindung ist vorgesehen, dass die Isolierschicht eine Dicke von 20-80 µm, vorzugsweise 50 µm, aufweist. In der Literatur ist eine Isolierschichtdicke von 300 µm als vorteilhaft angegeben. Eine solche Isolierschicht mit dieser Dicke ist unabhängig von der Materialwahl wegen der hohen thermischen Isolierung für das Verschweißen von besonders dünnen Folien ungeeignet. In an advantageous further embodiment of the invention provided that the insulating layer had a thickness of 20-80 µm, preferably 50 microns. In the literature there is one Insulation layer thickness of 300 microns indicated as advantageous. Such Insulating layer with this thickness is independent of the Material choice because of the high thermal insulation for the Unsuitable welding of particularly thin foils.

Eine besonders günstige Art der Beschichtung ist dann durchführbar, wenn mindestens eine Elektrode aus Aluminium besteht. A particularly favorable type of coating is then feasible if at least one electrode made of aluminum consists.

Für viele Anwendungsfälle ist vorgesehen, daß eine der Elektroden als Plattenelektrode und die andere Elektrode als formgebende Elektrode ausgebildet ist. Es kann jedoch zweckmäßig sein, daß beide Elektroden als Plattenelektroden oder als formgebende Elektroden ausgebildet sind. Ebenso kann es vorteilhaft sein, daß nicht nur eine Elektrode, sondern beide Elektroden in erfindungsgemäßer Weise beschichtet sind. For many applications it is provided that one of the Electrodes as the plate electrode and the other electrode as shaping electrode is formed. However, it can be useful be that both electrodes as plate electrodes or as shaping electrodes are formed. Likewise it can be advantageous that not just one electrode, but both Electrodes are coated in the manner according to the invention.

Damit die Elektrode trotz der Beschichtung gegen Spannungsüberschläge geschützt ist, kann in weiterer Ausbildung der Erfindung ein Spannungsregler vorgesehen sein, der die Spannung in Abhängigkeit vom Elektrodenabstand regelt. So that the electrode despite the coating against Flashovers is protected in further training the invention, a voltage regulator can be provided, which Regulates voltage depending on the distance between electrodes.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. In der Zeichnung zeigen: The invention is based on a Embodiment explained in more detail. The drawing shows:

Fig. 1 Die schematische Darstellung einer HF- Schweißvorrichtung, teilweise geschnitten; Fig. 1 The schematic representation of an HF welding device, partially sectioned;

Fig. 2 einen vergrößerten Teilausschnitt aus Fig. 1; FIG. 2 shows an enlarged partial section from FIG. 1;

Fig. 3 ein Schaubild der Abhängigkeit der HF-Durchschlagsfeldstärke vom Elektrodenabstand bei einer unbeschichteten und einer erfindungsgemäß beschichteten Elektrode. Fig. 3 is a graph of the dependence of the RF breakdown field strength of the electrode spacing with an uncoated and a coated electrode according to the invention.

Entsprechend der schematischen Darstellung einer HF- Schweißvorrichtung umfasst diese einen HF-Energieerzeuger oder Generator 1, eine Schweißstation 2, die mit dem Generator über eine HF-Verbindungsleitung 3 verbunden ist. Ein Anpassgerät und eine Regelvorrichtung zur Regelung der Leistung sind nicht dargestellt. Die Schweißstation 2 umfasst eine Gegenelektrode 4 mit Beschichtung 5 sowie eine Elektrodenhalterung 6, die eine Elektrode 7 (Schweißwerkzeug) trägt, die beim Schweißvorgang mit dem Schweißgut 8, 9 in Berührung kommt. According to the schematic representation of an HF welding device, it comprises an HF energy generator or generator 1 , a welding station 2 , which is connected to the generator via an HF connecting line 3 . A matching device and a regulating device for regulating the power are not shown. The welding station 2 comprises a counter electrode 4 with a coating 5 and an electrode holder 6 which carries an electrode 7 (welding tool) which comes into contact with the weld metal 8 , 9 during the welding process.

Die vergrößerte Ausschnittsdarstellung gemäß Fig. 2 zeigt die Gegenelektrode 4 mit Beschichtung 5 sowie die Elektrodenhalterung 6 mit Elektrode 7. Zwischen der Elektrode 7, die mit der Elektrodenhalterung 6 in leitender Verbindung steht und fest an dieser angeordnet ist, und der Gegenelektrode 4 befinden sich zwei miteinander zu verschweißende Folien 8 und 9. Die Isolierschicht 5 besteht aus einer Keramikschicht, die auf die Gegenelektrode aufgebracht ist und innig mit dieser verbunden ist. Diese Keramikschicht weist in den Oberflächenporen PTFE-Einlagerungen auf. Bei einer bevorzugten Ausgestaltung weist die Isolierschicht 5 eine Dicke von 50 µm auf. The enlarged sectional view of FIG. 2 shows the counter electrode 4 with coating 5 and the electrode holder 6 having the electrode 7. Between the electrode 7 , which is in conductive connection with the electrode holder 6 and is fixedly arranged thereon, and the counterelectrode 4 there are two foils 8 and 9 to be welded together. The insulating layer 5 consists of a ceramic layer which is applied to the counter electrode and is intimately connected to it. This ceramic layer has PTFE deposits in the surface pores. In a preferred embodiment, the insulating layer 5 has a thickness of 50 μm.

Fig. 3 zeigt ein Diagramm, bei welchem die Abhängigkeit der HF-Durchschlagsspannung veranschaulicht ist. Die mit 10 bezeichnete Kurve veranschaulicht die Abhängigkeit der HF- Durchschlagsspannung vom Elektrodenabstand bei einer unbeschichteten Gegenelektrode, während die mit 11 bezeichnete Kurve für ein Ausführungsbeispiel mit einer 50 µm dicken Isolierschicht um ca. 700 Volt höher liegt und die Abhängigkeit der HF-Durchschlagsspannung vom Elektrodenabstand bei erfindungsgemäßen Ausgestaltung wiedergibt. Fig. 3 shows a diagram in which the dependence of the RF breakdown voltage is illustrated. The curve labeled 10 illustrates the dependency of the RF breakdown voltage on the electrode spacing in the case of an uncoated counterelectrode, while the curve labeled 11 is for an exemplary embodiment with a 50 μm thick insulating layer approximately 700 volts higher and the dependency of the RF breakdown voltage on the electrode spacing in the embodiment according to the invention.

Claims (10)

1. Vorrichtung für das HF-Schweißen von Kunststofffolien mit zwei einander gegenüberstehenden Elektroden, zwischen denen die zu verschweißenden Folien für den Schweißvorgang aufgenommen sind, wobei sich zwischen der Kunststofffolie und mindestens einer Elektrode eine Isolierschicht befindet, dadurch gekennzeichnet, dass mindestens eine Elektrode (4) mit einer dünnen Isolierschicht (5) aus Keramik beschichtet ist. 1. Device for the HF welding of plastic foils with two mutually opposing electrodes, between which the foils to be welded are received for the welding process, an insulating layer being located between the plastic foil and at least one electrode, characterized in that at least one electrode ( 4th ) is coated with a thin insulating layer ( 5 ) made of ceramic. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Oberfläche der Keramikschicht (5) zumindest in Oberflächenporen PTFE-Einlagerungen aufweist. 2. Device according to claim 1, characterized in that the surface of the ceramic layer ( 5 ) has PTFE inclusions at least in surface pores. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die gesamte Oberfläche der Keramikschicht (5) mit einer PTFE-Schicht beschichtet ist. 3. Device according to claim 2, characterized in that the entire surface of the ceramic layer ( 5 ) is coated with a PTFE layer. 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Keramikschicht (5) mit der mindestens einen Elektrode (4) innig verbunden ist. 4. Device according to one of claims 1 to 3, characterized in that the ceramic layer ( 5 ) with the at least one electrode ( 4 ) is intimately connected. 5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Isolierschicht (5) eine Dicke von 20-80 µm, vorzugsweise 50 µm, aufweist. 5. Device according to one of claims 1 to 4, characterized in that the insulating layer ( 5 ) has a thickness of 20-80 microns, preferably 50 microns. 6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die mindestens eine Elektrode (4) aus Aluminium besteht. 6. Device according to one of claims 1 to 5, characterized in that the at least one electrode ( 4 ) consists of aluminum. 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine der Elektroden als Plattenelektrode (4) und die andere Elektrode als formgebende Elektrode (7) ausgebildet ist. 7. Device according to one of claims 1 to 6, characterized in that one of the electrodes is designed as a plate electrode ( 4 ) and the other electrode as a shaping electrode ( 7 ). 8. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß beide Elektroden als Plattenelektroden (4) ausgebildet sind. 8. Device according to one of claims 1 to 6, characterized in that both electrodes are designed as plate electrodes ( 4 ). 9. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß beide Elektroden als formgebende Elektroden (7) ausgebildet sind. 9. Device according to one of claims 1 to 6, characterized in that both electrodes are designed as shaping electrodes ( 7 ). 10. Vorrichtung nach einem der Ansprüche 1 bis 9, gekennzeichnet durch einen Spannungsregler, der die Spannung in Abhängigkeit vom Elektrodenabstand regelt. 10. The device according to one of claims 1 to 9, characterized by a voltage regulator that the Regulates voltage depending on the distance between electrodes.
DE10152395.5A 2001-10-24 2001-10-24 Use of a device for the HF welding of plastic films Expired - Lifetime DE10152395B4 (en)

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