DE886050C - Electrodes for welding plastic foils using high frequency - Google Patents

Electrodes for welding plastic foils using high frequency

Info

Publication number
DE886050C
DE886050C DEK10186A DEK0010186A DE886050C DE 886050 C DE886050 C DE 886050C DE K10186 A DEK10186 A DE K10186A DE K0010186 A DEK0010186 A DE K0010186A DE 886050 C DE886050 C DE 886050C
Authority
DE
Germany
Prior art keywords
electrodes
welding
high frequency
electrode
foils
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.)
Expired
Application number
DEK10186A
Other languages
German (de)
Inventor
Hans Dipl-Ing Mende
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.)
KOERTING RADIO WERKE OSWALD RI
Original Assignee
KOERTING RADIO WERKE OSWALD RI
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KOERTING RADIO WERKE OSWALD RI filed Critical KOERTING RADIO WERKE OSWALD RI
Priority to DEK10186A priority Critical patent/DE886050C/en
Application granted granted Critical
Publication of DE886050C publication Critical patent/DE886050C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • 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
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • 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
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—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
    • B29C66/8188—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 conducting constructional aspects
    • B29C66/81881—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 conducting 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
    • B29C66/01—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
    • B29C66/70—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

Landscapes

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

Description

Elektroden zum Verschweißen von Kunststoff-Folien mittels Haochirequenz Die Verschweiß, ung von Folien aus Polyvinylchlorid, Polyamiden oder anderen Kunststoffen mittels Hochfrequenz hat auf Grund der gegenüber dem Nähen solcher Folien mit Textilfäden wesentlich verbesserten Zug- und Reißfestigkeit und sonstiger Vorteile wegen weite Verbreitung gefunden.Electrodes for welding plastic foils by means of haochirequence the Welding of foils made of polyvinyl chloride, polyamides or other plastics by means of high frequency has due to the opposite of sewing such foils with textile threads Significantly improved tensile and tear strength and other advantages because of the width Spread found.

Für die Hochfrequenzverschweißung werden allgemein Metallelektroden verwendet.Metal electrodes are generally used for high-frequency welding used.

Da diese Metallelektroden eine hohe Wärmeleitfähigkeit besitzen, wird immer ein erheblicher Teil der durch das Hochfrequenzfeld in der Folie erzeugten Wärme nach außen abgeleitet und geht für den Schweißvorgang verloren. Es entsteht beim Verschweißen mehrerer Folien durch die Wärmeableitung der Elektroden ein Temperaturgefälle in der Weise, daß die Temperatur der in unmittelbarer Berührung mit den Elektroden stehenden Folien niedriger bleibt als die der zwischen ihnen liegenden. Since these metal electrodes have a high thermal conductivity, is always a significant part of the generated by the high-frequency field in the film Heat is dissipated to the outside and is lost for the welding process. It arises when welding several foils, a temperature gradient due to the heat dissipation of the electrodes in such a way that the temperature of the in direct contact with the electrodes standing foils remains lower than those between them.

Um diese außen an den Elektroden liegenden Folien auf Schweißtemperatur zu bringen, muß, namentlich bei der Verarbeitung sehr dünner Folien, die aufgewendete Hochfrequenzleistung so weit erhöht weIden, daß die Temperatur der innenliegenden Folien die zulässige Grenze überschreitet und zur Zersetzung des Materials führt. Diese verändert die mechanischen und elektriscben Eigenschaften des Materials, insbesondere auch seinen Isolationswert, so daß Durchschläge erfolgen, die das Material zerstören und die Schweißelektroden beschädigen. Dadurch, daß die notwendige Leistungserhöhung auch eine Erhöhung der an den Elektroden liegenden Hochfrequenzspannung bedingt, wird die Gefahr der Durchschläge noch verschärft, die Schäden an Material und Elektroden nehmen einen erheblichen Umfang an und machen das Hochfrequenzschweißverfahren unwirtschaftlich. Around these foils lying on the outside of the electrodes at welding temperature to bring must, especially when processing very thin foils that expended High-frequency power is increased to such an extent that the temperature of the internal Foil exceeds the permissible limit and leads to the decomposition of the material. This changes the mechanical and electrical properties of the material, in particular also its insulation value, so that breakdowns occur that destroy the material and damage the welding electrodes. By the fact that the necessary increase in performance also causes an increase in the high-frequency voltage applied to the electrodes, the risk of breakthroughs becomes even greater exacerbated the damage to Material and electrodes take on a considerable volume and make the high frequency welding process uneconomical.

Bekannt ist, zur Verhinderung der Wärmeaibleitung bei metallischen Elektroden diese auf der dem Schweißgut zugekehrten Stirnfläche mit einer schlecht wärmeleitenden Kunststoffschicht zu versehen. Diese Schicht wird im Hochfrequenzfelde entsprechend den dielektrischen Verlusten des Materials gleichfalls in sich mehr oder weniger erwärmt und dadurch die Verhinderung der Wärmeableitung noch erhöht, andererseits aber ihre Festigkeit durch die Erwärmung vermindert. It is known to prevent heat dissipation in metallic Electrodes this on the end face facing the weld metal with a bad to provide a thermally conductive plastic layer. This layer is in the high frequency field in accordance with the dielectric losses of the material also more in itself or less heated, thereby increasing the prevention of heat dissipation, on the other hand, however, their strength is reduced by the heating.

Die vielfältige Anwendung des Hochfrequenzschweißverfahrens zur Herstellung von MassenartikeIn aus thermoplatischen Kunststoffen stellt aber an die dazu verwendeten Elektroden hohe Anforderungen an Festigkeit und Dauerhaftigkeit. The diverse application of high-frequency welding processes for manufacturing of mass-produced articles made of thermoplastic plastics, however, represents the ones used for them Electrodes make high demands on strength and durability.

Bei Elektrodenformen, die in ihrer Profilierung sehr scharfkantig sein müssen, insbesondere dann, -wenn die Elektroden nicht nur zum Schweiißen, sondern gleichzeitig zur Oberflächenformung (Prägung) und zur Ausformung des Werkstückes dienen sollen, wird die Preß- und Prägeoberfläche der Elektroden aus Kunststoffen den mechanischen Anforderungen auf die Dauer nicht genügen. Desgleichen ist es bei profilierten Elektroden sehr schwierig, zur Erzielung der erforderlichen gleichmäßigen Feldverteilung die Isolierschicht über die ganze Elektrodenstirnfiäche in gleicher Stärke herzustellen.With electrode shapes that are very sharp-edged in their profile must be, especially if the electrodes are not just for welding, but at the same time for surface shaping (embossing) and for shaping the workpiece are to serve, the pressing and embossing surface of the electrodes is made of plastics do not meet the mechanical requirements in the long run. It is the same with profiled electrodes very difficult to achieve the required uniformity Field distribution of the insulating layer over the entire electrode face in the same way To make starch.

Gegenstand der Erfindung sind daher Schwieißelektroden, die in ihrer Masse aus schlecht wärmeleitendem Material bestehen, während ihre Oberfläche mit einer dünnen Metallschicht überzogen wird. Die-Wärmeableitung durch diese dünne Metallschicht ist gering, und es wird praktisch der gIeiche Effekt erzielt wie bei einer Metallelektrode mit dielektrischem Überzug Die metallene Außenschicht der erfindungsgemäßen Elektroden erfüllt die Bedingungen bezüglich der Festigkeit und Dauerhaftigkeit der Profilierung und Scharfkantigkeit der Preß- und Prägeoberfläche. The invention therefore relates to welding electrodes in their Mass consist of poorly thermally conductive material, while their surface with a thin metal layer is coated. Die-heat dissipation through this thin The metal layer is thin and practically the same effect is achieved as with of a metal electrode with a dielectric coating. The metal outer layer of the electrodes according to the invention fulfills the conditions with regard to strength and Durability of the profile and sharpness of the pressed and embossed surface.

In Abb. I ist ein schematisches Beispiel einer solchen Elektrode dargestellt. Auf der aus schlecht wärmeleitendem Material bestehenden Masse des Elektrodenkörpers a ist eine elektrisch gut leitende Metallschicht b aufgebracht. Die Aufbringung der Metallschicht kann durch Aufdampfen, Aufspritzen, Galvanisieren oder Aufprägen von dünnem Blech oder Metallfolien erfolgen. Auch kann diese Elektrode als metallischer Hohlkörper hergestellt, z. B. auf galvanoplastischem Wege, und der Hohlraum mit schlecht wärmeleitendem Material ausgefüllt werden. In Fig. I is a schematic example of such an electrode shown. On the mass of the poorly thermally conductive material An electrically highly conductive metal layer b is applied to the electrode body a. The metal layer can be applied by vapor deposition, spraying or electroplating or stamping of thin sheet metal or metal foils. This electrode can also manufactured as a metallic hollow body, e.g. B. by electroforming, and the cavity can be filled with poorly thermally conductive material.

Bei der Verarbeitung von besonders dünnen Kunststoff-Folien, die im allgemeinen nur verschweißt werden, ist die Durchschlagsgefahr groß, sei es nun durch eine Unhomogenität des Schweißgutes oder das Dazwischenkommen eines Fremdkörpers, z. B. Staubkorns. Für Elektroden zum Verschweißen solcher Folien wird daher zur Verhinderung von elektrischen Durchschlägen vorgeschlagen, diese mit einem dielektrischen Überzug zu versehen. In Abb. 2 bedeutet wieder a den Elektrodenkörper aus schlecht wärmeleitendem Material, b die leitende Metallschicht und c den isolierenden Überzug. When processing particularly thin plastic films, the are generally only welded, the risk of breakdown is great, be it now due to an inhomogeneity of the weld metal or the intervening of a foreign body, z. B. dust particle. For electrodes for welding such films is therefore used Prevention of electrical breakdowns proposed this with a dielectric To provide coating. In Fig. 2, a again means the electrode body from bad thermally conductive material, b the conductive metal layer and c the insulating coating.

PATENTANSPROCHE: I. Hochfrequenzschweißelektrode, dadurch gekennzeichnet, daß sie aus einem Material mit schlechter Wärmeleitfähigkeit hergestellt wird, das mit einer dünnen, elektrisch leitenden Schicht überzogen wird. PATENT CLAIM: I. High-frequency welding electrode, characterized in that that it is made of a material with poor thermal conductivity that is covered with a thin, electrically conductive layer.

2. Hochfrequenzschweißelektrode nach Anspruch I, dadurch gekennzeichnet, daß die Elektrode aus Kunststoff hergestellt und eine leitende metallische Schicht aufgedampft, aufgespritzt, galvanisch niedergeschlagen oder in Form eines dünnen Bleches oder einer Folie aufgeprägt wird. 2. High-frequency welding electrode according to claim I, characterized in that that the electrode is made of plastic and has a conductive metallic layer vapor-deposited, sprayed-on, electroplated or in the form of a thin Sheet or a foil is stamped.

3. Hochfrequenzschweißelektrode nach Anspruch I, dadurch gekennzeichnet, daß die Elektrode als Hohlkörper aus dünnem, leitendem Material hergestellt und mit einem schlechten Wärmeleiter ausgefüllt wird. 3. High-frequency welding electrode according to claim I, characterized in that that the electrode is made as a hollow body made of thin, conductive material and is filled with a poor conductor of heat.

4. Hochfrequenzschweißelektrode nach Anspruch I, 2 oder 3, dadurch gekennzeichnet, daß sie aus einem Material mit schlechter Wärmeleitfähigkeit hergestellt, mit einer dünnen metallischen Schicht überzogen und diese mit einem isolierenden Überzug versehen wird. 4. High frequency welding electrode according to claim I, 2 or 3, characterized characterized in that it is made of a material with poor thermal conductivity, covered with a thin metallic layer and this with an insulating Coating is provided.

Claims (1)

Angezogene Druckschriften: Britische Patentschriften Nr. 577 474, 577 719. Cited Documents: British Patent Specification No. 577,474, 577 719.
DEK10186A 1951-06-06 1951-06-06 Electrodes for welding plastic foils using high frequency Expired DE886050C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK10186A DE886050C (en) 1951-06-06 1951-06-06 Electrodes for welding plastic foils using high frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK10186A DE886050C (en) 1951-06-06 1951-06-06 Electrodes for welding plastic foils using high frequency

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DE886050C true DE886050C (en) 1953-08-10

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DEK10186A Expired DE886050C (en) 1951-06-06 1951-06-06 Electrodes for welding plastic foils using high frequency

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824347A1 (en) * 1988-07-19 1989-09-14 Daimler Benz Ag Electrode for dielectrically heating thermoplastics

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB577474A (en) * 1944-04-22 1946-05-20 British Insulated Cables Ltd Improvements relating to apparatus for heating insulating material by subjecting it to a high frequency field of electric force
GB577719A (en) * 1944-04-22 1946-05-29 British Insulated Cables Ltd Improvements relating to apparatus for heating insulating material by subjecting it to a high frequency field of electric force

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB577474A (en) * 1944-04-22 1946-05-20 British Insulated Cables Ltd Improvements relating to apparatus for heating insulating material by subjecting it to a high frequency field of electric force
GB577719A (en) * 1944-04-22 1946-05-29 British Insulated Cables Ltd Improvements relating to apparatus for heating insulating material by subjecting it to a high frequency field of electric force

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824347A1 (en) * 1988-07-19 1989-09-14 Daimler Benz Ag Electrode for dielectrically heating thermoplastics

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