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DE10152395B4 - Use of a device for the HF welding of plastic films - Google Patents

Use of a device for the HF welding of plastic films Download PDF

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Publication number
DE10152395B4
DE10152395B4 DE10152395.5A DE10152395A DE10152395B4 DE 10152395 B4 DE10152395 B4 DE 10152395B4 DE 10152395 A DE10152395 A DE 10152395A DE 10152395 B4 DE10152395 B4 DE 10152395B4
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DE
Germany
Prior art keywords
electrode
welding
insulating layer
foils
separation welding
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Expired - Lifetime
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DE10152395.5A
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German (de)
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DE10152395A1 (en
Inventor
Rupert Gschwendtner
Eduard Rothbauer
Gerhard Wieser
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Kiefel GmbH
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Kiefel GmbH
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    • 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

Verwendung einer Vorrichtung zum HF-Trennschweißen von Folien aus Kunststoff unter Vermeidung von Durchschlägen beim Trennschweißen, mit zwei einander gegenüberstehenden Elektroden, zwischen denen die trennzuschweißenden Folien für den Trennschweißvorgang aufgenommen sind, dadurch gekennzeichnet, dass sich zwischen einer Folie und einer Elektrode eine Isolierschicht befindet, wobei eine Elektrode mit einer Isolierschicht aus Keramik mit einer Dicke von 20 µm bis 80 µm in einem innigen Verbund beschichtet ist, wobei eine Oberfläche der Isolierschicht zumindest in Oberflächenporen PTFE-Einlagerungen aufweist.Use of a device for HF separation welding of foils made of plastic while avoiding breakdowns during separation welding, with two electrodes facing each other, between which the foils to be separated are accommodated for the separation welding process, characterized in that there is an insulating layer between a foil and an electrode, wherein an electrode with an insulating layer made of ceramic with a thickness of 20 microns to 80 microns is coated in an intimate composite, wherein a surface of the insulating layer has PTFE inclusions at least in surface pores.

Description

Die Erfindung bezieht sich auf eine Verwendung einer Vorrichtung für das HF-Trennschweißen 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 the use of a device for the HF separation welding of plastic films with two mutually opposing electrodes, between which the films to be welded for the welding process are accommodated, an insulating layer being located between the plastic film and at least one electrode.

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 shims are provided for many HF welds, which should prevent breakdowns, particularly in the case of welds with cut edges. Such inserts are then on the side of the counter electrode. The primary purpose of these insulating inserts is to prevent breakdown in separating welds and to effect thermal insulation. In the case of extremely thin foils, however, thermal insulation is not desirable to the same extent as when welding thick foils due to the heat build-up that occurs. Films of approximately 0.1 millimeter thickness are considered to be extremely thin films. With such thin foils, the thermal insulation causes the temperature maximum to be shifted into the foil adjacent to the insulating material or even into the insulating material and is therefore no longer at the point of contact between the two foils where the welding process is to take place or even outside the foil. Film thicknesses below 0.1 millimeters can therefore no longer be reliably sealed under normal conditions.

Aus der US 5 427 645 A ist eine Vorrichtung zum Hochfrequenz-Verschweißen zweier thermoplastischer Folien miteinander bekannt. Eine Elektrode kann aus Aluminium gefertigt sein und ist mit einer Keramikschicht überzogen. Die Keramikschicht ist vorgesehen, um möglichst viel Wärmeenergie umsetzen zu können.From the US 5,427,645 A a device for high-frequency welding of two thermoplastic films together is known. An electrode can be made of aluminum and is covered with a ceramic layer. The ceramic layer is provided in order to be able to convert as much thermal energy as possible.

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 to provide a device for HF welding, in particular of extremely thin foils, in which, on the one hand, breakdown is prevented, in particular in the case of separating welds, but the thermal insulation associated therewith does not turn out to be so high that a temperature shift due to a heat build-up in the insulating layer takes place.

Diese Aufgabe wird durch eine Verwendung einer Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by using a device with the features of claim 1.

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 makes it possible to achieve a very thin insulating layer with electrical insulation to prevent breakdown, in particular in the case of separating welds, but on top of that, particularly when welding extremely thin foils, it does not have the usual thermal insulation effect. In contrast to the present invention, insulating materials, such as, for example, phenolic resin hard papers, polyester films, cellulose epoxy papers, silicone-PTFE compounds, rubber-rubber tissue cloths, are mentioned, a thickness of 0.3 millimeters having proven itself in these insulating materials Has. This insulation thickness is already unsuitable for welding extremely thin foils.

Gemäß der Erfindung weist die Oberfläche der Keramikschicht zumindest in Oberflächenporen PTFE-Einlagerungen auf.According to the invention, the surface of the ceramic layer has PTFE inclusions, at least 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 high electrical insulation already mentioned, but also makes it easier to weld with thin foils, because compared to thicker welding pads of a known type, despite the lower thermal conductivity compared to an uncoated electrode, the temperature maximum does not shift into the lower foil. The PTFE deposits prevent the weld metal from sticking to the tool, so that any necessary separating foils or mechanical separating devices 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 coat the entire surface of the ceramic layer with a PTFE layer.

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 at least one electrode is coated with the ceramic layer in such a way that the ceramic layer is intimately connected to the electrode. This creates the prerequisite for the formation of a very thin insulating layer, because in contrast to the applied insulating layers, which must have a certain thickness for reasons of inherent stability, the insulating layer is firmly connected to the surface of the electrode.

Gemäß 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.According to the invention it is provided that the insulating layer has a thickness of 20-80 microns, preferably 50 microns. In the literature, an insulating layer thickness of 300 µm is stated to be advantageous. Such an insulating layer with this thickness is unsuitable for welding particularly thin foils, regardless of the choice of material, because of the high thermal insulation.

Eine besonders günstige Art der Beschichtung ist dann durchführbar, wenn mindestens eine Elektrode aus Aluminium besteht.A particularly favorable type of coating can be carried out if at least one electrode consists of aluminum.

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 is designed as a plate electrode and the other electrode as a shaping electrode. However, it may be expedient that both electrodes are designed as plate electrodes or as shaping electrodes. It can also be advantageous that not only 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 is protected against flashovers despite the coating, a voltage regulator can be provided in a further embodiment of the invention, which regulates the voltage as a function of the electrode spacing.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. In der Zeichnung zeigen:

  • 1 Die schematische Darstellung einer HF- Schweißvorrichtung, teilweise geschnitten;
  • 2 einen vergrößerten Teilausschnitt aus 1;
  • 3 ein Schaubild der Abhängigkeit der HF-Durchschlagsfeldstärke vom Elektrodenabstand bei einer unbeschichteten und einer erfindungsgemäß beschichteten Elektrode.
The invention is explained in more detail below using an exemplary embodiment. The drawing shows:
  • 1 The schematic representation of an HF welding device, partially cut;
  • 2nd an enlarged partial section 1 ;
  • 3rd a diagram of the dependence of the RF breakdown field strength on the electrode spacing with an uncoated and an electrode coated 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 2nd connected to the generator via an RF connecting line 3rd connected is. A matching device and a regulating device for regulating the power are not shown. The welding station 2nd includes a counter electrode 4th with coating 5 as well as an electrode holder 6 who have an electrode 7 (Welding tool) carries the welding process with the weld metal 8th , 9 comes into contact.

Die vergrößerte Ausschnittsdarstellung gemäß 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 section according to 2nd shows the counter electrode 4th with coating 5 as well as the electrode holder 6 with electrode 7 . Between the electrode 7 with the electrode holder 6 is in conductive connection and is fixedly arranged thereon, and the counter electrode 4th there are two foils to be welded together 8th and 9 . The insulation layer 5 consists of a ceramic layer that 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 has 5 a thickness of 50 microns.

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. 3rd 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 reproduces in the embodiment of the invention.

Claims (5)

Verwendung einer Vorrichtung zum HF-Trennschweißen von Folien aus Kunststoff unter Vermeidung von Durchschlägen beim Trennschweißen, mit zwei einander gegenüberstehenden Elektroden, zwischen denen die trennzuschweißenden Folien für den Trennschweißvorgang aufgenommen sind, dadurch gekennzeichnet, dass sich zwischen einer Folie und einer Elektrode eine Isolierschicht befindet, wobei eine Elektrode mit einer Isolierschicht aus Keramik mit einer Dicke von 20 µm bis 80 µm in einem innigen Verbund beschichtet ist, wobei eine Oberfläche der Isolierschicht zumindest in Oberflächenporen PTFE-Einlagerungen aufweist.Use of a device for HF separation welding of foils made of plastic while avoiding breakdowns during separation welding, with two electrodes facing each other, between which the foils to be separated are accommodated for the separation welding process, characterized in that an insulating layer is located between a foil and an electrode, wherein an electrode with an insulating layer made of ceramic with a thickness of 20 microns to 80 microns is coated in an intimate composite, wherein a surface of the insulating layer has PTFE inclusions at least in surface pores. Verwendung der Vorrichtung zum HF-Trennschweißen nach Anspruch 1, dadurch gekennzeichnet, dass die Isolierschicht eine Dicke von 50 µm aufweist.Use of the device for HF separation welding after Claim 1 , characterized in that the insulating layer has a thickness of 50 microns. Verwendung der Vorrichtung zum HF-Trennschweißen nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die beschichtete Elektrode aus Aluminium besteht.Use of the device for HF separation welding after Claim 1 or 2nd , characterized in that the coated electrode is made of aluminum. Verwendung der Vorrichtung zum HF-Trennschweißen nach einem der Ansprüche 1 bis 3, gekennzeichnet durch einen Spannungsregler, der eine Spannung in Abhängigkeit eines Elektrodenabstands zu regeln eingerichtet ist.Use of the device for HF separation welding according to one of the Claims 1 to 3rd , characterized by a voltage regulator which is set up to regulate a voltage as a function of an electrode spacing. Verwendung einer HF-Schweißvorrichtung nach einem der vorhergehenden Ansprüche zum HF-Trennschweißen zweier Folien mit einem Elektrodenabstand zwischen 0,1 mm und 1,9 mm.Use of an HF welding device according to one of the preceding claims for HF separation welding of two foils with an electrode spacing between 0.1 mm and 1.9 mm.
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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Citations (1)

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Publication number Priority date Publication date Assignee Title
US5427645A (en) 1991-12-09 1995-06-27 W. R. Grace & Co.-Conn. Apparatus and method for radio frequency sealing thermoplastic films together

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5427645A (en) 1991-12-09 1995-06-27 W. R. Grace & Co.-Conn. Apparatus and method for radio frequency sealing thermoplastic films together

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