DE2727701A1 - Thermal insulator prodn. using a short moulding cycle - by hot pressing fibre mat, adhesive and covering in high frequency field - Google Patents

Thermal insulator prodn. using a short moulding cycle - by hot pressing fibre mat, adhesive and covering in high frequency field

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Publication number
DE2727701A1
DE2727701A1 DE19772727701 DE2727701A DE2727701A1 DE 2727701 A1 DE2727701 A1 DE 2727701A1 DE 19772727701 DE19772727701 DE 19772727701 DE 2727701 A DE2727701 A DE 2727701A DE 2727701 A1 DE2727701 A1 DE 2727701A1
Authority
DE
Germany
Prior art keywords
covering
fiber fleece
adhesive
fabric
frequency field
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
DE19772727701
Other languages
German (de)
Other versions
DE2727701C2 (en
Inventor
Nichtnennung Beantragt
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.)
Johann Borgers GmbH and Co KG
Original Assignee
Johann Borgers GmbH and Co KG
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 Johann Borgers GmbH and Co KG filed Critical Johann Borgers GmbH and Co KG
Priority to DE2727701A priority Critical patent/DE2727701C2/en
Publication of DE2727701A1 publication Critical patent/DE2727701A1/en
Application granted granted Critical
Publication of DE2727701C2 publication Critical patent/DE2727701C2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/62—Apparatus for specific applications
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/08—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means for dielectric heating
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/52—Heating or cooling
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3005—Body finishings
    • B29L2031/3011—Roof linings

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

Thermal insulator produced from a fibre mat and covering has an adhesive beneath the covering. In this improvement the covering is moulded and bonded on whilst the resin-treated mat is being moulded under heat and pressure, and the mat is additionally heated by h.f. field. The process is simple and has a high output rate. Polyurethane foam which is washable and therefore suitable for car interiors can be used.

Description

Kennwort: " IIF-KomplettierungPassword: "IIF completion

Verfahren zur llerstellung von komplettierten Dämmelementen Die erfindung betrifft ein Verfahren zur lierstellung von aus einem Faservlies und einem Bezugsstoff bestehenden kompletten Dämmelernent mit im Faservlies eingebrachten Bindeharzen und mit unterseitig des Bezugsstoffes aufgetragenem Klebstoff nach Patent .... (Patentanmeldung P 2 711 376.4), wobei während des Formens und Härtens des mit bindeharz versehenen Faservlieses durch Pressen und Erwärmung zugleich der Bezugsstoff mitverformt und mit dem Faservlies verklebt wird.Method for the production of completed insulation elements The invention relates to a method for the production of a fiber fleece and a cover fabric existing complete insulation element with binding resins incorporated in the fiber fleece and with adhesive applied to the underside of the cover material according to the patent .... (patent application P 2 711 376.4), during the molding and hardening of the resin provided with binding resin By pressing and heating the fiber fleece, the upholstery fabric is also deformed and is glued to the fiber fleece.

ein Kriterium für eine gute Formung und Aushärtung eines komplettierten Dämmelementes ist, daß über längere Zeit im Grenzbereich beginnder Pyrolyse gearbeitet werden muß, um optimale Ergebnisse hinsichtlich der Qualität des Jan,lelementes zu erzielen. Geringfügige Uberschreitungen dieses Grenzbereiches, der in sich auch wieder variabel in Abhängigkeit von der jeweiligen Feuchte des Fasergutes ist, führen zur Zerstörung des Faservlieses. Das hauptverfahren stellt also hohe Anforderungen bezüglich gleichbleibender Rohmaterialien und bedingt gleichzeitig eine sorgfältige Überwachung des Fertigungsvorganges durch einen hochqualifizierten Dedionungsmann. Auch ist die Erwärmdngs-und Aushärtungszeit mit z.B. 3 minuten für ein bostimmtes Dämmelement verhältnismäßig hoch.a criterion for good shaping and curing of a completed Insulating element is that worked over a longer period of time in the border area of the beginning pyrolysis must be in order to achieve optimal results in terms of the quality of the Jan, oil element to achieve. Slight transgressions of this limit area, which is also in itself is again variable depending on the respective moisture content of the fiber material, lead to destroy the fiber fleece. The main process is therefore very demanding with regard to consistent raw materials and at the same time requires careful Monitoring of the manufacturing process by a highly skilled Dedication man. The heating and curing time is also, for example, 3 minutes for a certain insulation element is relatively high.

Der Erfindung liegt die Aufgabe zugrunde, @ip einfacheres und mit weniger Kontrollaufwand verbundenes Fertigungsverfahren für komplettierte Dämmelemente zu finden, das eine in der zeiteinheit stückzahlmäßig höhere und damit wirtschaftlichere Produktion ermöglicht.The invention is based on the object @ip simpler and with less control effort associated manufacturing process for completed insulation elements to find the one that is higher in the unit of time and therefore more economical Production made possible.

Dies wird erfindungsgemöß dadurch erreicht, daß zur Aushärtung des jindeharzes das Faservlies zusätzlich durch -ir !ochfrequenzfeld erwärmt wird.This is achieved according to the invention in that for hardening of the jindeharzes the fiber fleece is additionally heated by -ir! ochfrequency field.

Das an sich bekannte Verfahren der Mochfrequenzerwärmung wird in der erfindungsgemäßen Anwendung in Kombination mit einer konventionell, z.B. elektrisch, beheizten und mit Pressdruck beaufschlagten Form eingesetzt. Die Erwärmung erfolgt hierbei, und das ist ein ganz wesentlicher Vorteil der Erfindung, in einer sehr kurzen Zeitspanne und zwar in der Größenordnung von etwa 30 Sekunden. Es können hierbei sogar über die IIF-Erwärmung der Pressung und Aushärtung förderliche höhere Temperaturen von z.B. 2400 zur Anwendung gebracht werden, die eben in ihrer kurzen Einwirkzeit keinen schienen Einfluß auf das Fasergut haben.The per se known method of high frequency heating is in the application according to the invention in combination with a conventional, e.g. electrical, heated and pressurized form used. The heating takes place here, and that is a very important advantage of the invention, in a very great way short period of time, on the order of about 30 seconds. It can in this case even higher ones, which are conducive to the IIF heating of the pressing and curing Temperatures of e.g. 2400 can be used, which in their short The exposure time did not seem to have any influence on the fiber material.

Die zusätzliche Hochfrequenzerwärmung wird vor allem auch dort genutzt, wo polare Moleküle enthaltendes Material, wie z..The additional high-frequency heating is mainly used there where material containing polar molecules, such as

Baumwolle mit Harz und ggf. Feuchtigkeit, mit Warrne beaufschlagt werden soll. Solcherart schlechte Wärmeleiter erfordern bei konventioneller Erhitzung eine lange Aufwärmzeit, die die vorbeschriebenen Fertigungsschwierigkeiten nach sich ziehen kann.Cotton with resin and possibly moisture, treated with Warrne shall be. Such poor conductors require conventional heating a long warm-up time, which causes the manufacturing difficulties described above can pull itself.

Ein weiterer Vorteil des erfindungsgemäßen Verfahrens ist es, daß nan als ßczugsstoff anstelle eines Faservliesstoffes nunrlellr auch PVC-Iaterial, cinen aus ciner Folie und Polyurethan-Sclwaurr, beste1cnden uorkstoff, einsetzen kann. Dieses Material weist neben seiner Preisgünstigkeit auch den Vorteil der Abwaschbarkeit auf, was insbesondere bei der Verwendung von Dämmelementen im Automobilbau von besonderer Bedeutung ist.Another advantage of the method according to the invention is that as a draw material instead of a non-woven fabric, now also PVC material, Use cins made of film and polyurethane foam, the best raw material can. In addition to being inexpensive, this material also has the advantage of being washable on, which is particularly important when using insulating elements in automobile construction Meaning is.

Ein Ijezugsstoff auf PVC-Basis kann aber nur unter Anwendung der bescJriebenen kombinierten IIF-Erwärmung benutzt werden, weil nur so - und das ist ein außerordentlich wichtiges Merkmal der Erfindung - ein von innen nach außen verlaufendes Temperaturprofil, das heißt, eine von innen nach außen abfallende Temperatur, erzeugt werden kann und somit einerseits die erforderliche kurzfristig hohe Kernwärme, wie auch eine am ßezugsstoff nicht überschreitbare Grenztemperatur von 800, vorzugsweise 60°, ohne sich gegenseitig überlagernde und somit negative Wirkung erzielbar ist. Die Grenztemperatur an der Oberfläche des Bezugsstoffes kann gegebenenfalls auch durch entsprechende Kühlung der Patrize erreicht werden.A PVC-based cover material can, however, only be made using the described combined IIF heating can be used because only then - and that is an extraordinary one important feature of the invention - a temperature profile running from the inside to the outside, that is, a temperature that drops from the inside to the outside can be generated and thus on the one hand the required short-term high core heat, as well as one limit temperature of 800, preferably 60 °, which cannot be exceeded on the draft material, can be achieved without mutually overlapping and thus negative effects. the Limit temperature on the surface of the cover fabric can also be through corresponding cooling of the patrix can be achieved.

Die bei der HF-Beaufschlagung erzeugte Feldenergie wird im Faservlies kurzzeitig in Wärme umgesetzt. hierbei bestimmen die elektrische Leitfähigkeit, der dielektrische Verlustfaktor, die Dielektrizitätskonstante sowie Frequenz und Amplitude des IIF-Feldes den Wirkungsgrad des Aushärtungsvorganges hinsichtlicii Temperatur- und Zeitgröße.The field energy generated by the RF exposure is in the nonwoven fabric briefly converted into heat. determine the electrical conductivity, the dielectric loss factor, the dielectric constant as well as frequency and Amplitude of the IIF field regarding the efficiency of the curing process Temperature and time size.

Es ist selbstverständlich ein ganz bedeutsamer Vorteil der Erfindung, daß die Herstellzeit pro Stück Dämmelement wesentlich, in der Großenordnung von etwa 5:1, gesenkt werden kann, was die Wirtschaftlichkeit des Verfahrens enorm steigert.It is of course a very significant advantage of the invention, that the production time per piece of insulating element is substantial, in the order of magnitude of about 5: 1, which increases the economic efficiency of the process enormously.

Das erfindungsgemäße Verfahren kann vorzugsweise in zwei Varianten zur Anwendung gebracht werden, so ist z.B. einmal die aus Patrize und Matrize bestehende Presse als Übertragungselement des von einem HF-Generator erzeugten Rochfrequenzfeldes ausgebildet, und HF-Erwärmung, konventionelle Frwirmuna und Pressung örtlich einheitlich entweder gleichzeitig oder in sinnvoll programmierter Aufeinanderfolge angawandt. Die andere Möglichkeit ist die separate Vorbehandlung des sich in der Patrize befindlichen Faservlieses mittels HF-Erwärmung außerhalb der Presse und das anschließende Einfahren des vorbehandelten Faservlieses in die Presse zur abschließenden konventionellen Wärme und Druckbehandlung.The method according to the invention can preferably be in two variants are used, for example, once the one from the patrix and die existing press as a transmission element of an HF generator generated high frequency field, and HF heating, conventional Frwirmuna and pressing locally uniform, either simultaneously or in a meaningfully programmed way Sequence applied. The other option is separate pretreatment of the fiber fleece located in the male mold outside by means of HF heating the press and the subsequent insertion of the pretreated fiber fleece into the Press for the final conventional heat and pressure treatment.

Weitere Maßnahmen und Vorteile der Erfindung sind aus den Ansprüchen, der nachfolgenden r3esciireibung sowie s1en Zc-ichnur.gor zu ersehen.Further measures and advantages of the invention can be found in the claims, the following description as well as s1en Zc-ichnur.gor can be seen.

Auf den Zeichnungen ist der Erfindungsgegenstand in einem Ausführungsbeispiel dargestellt und zwar zeigen: Fig. 1 eine Presse zur Erzeugung von komplettierten Dämmelementen unter zusätzlicher Verwendung eines IIF-Feldes, Fig. 2 eine Presse zur Erzeugung von komplettierten Dämmelementen mit außerhalb der Presse wirksamen IlF-reld, Fig. 3 ein komplettiertes Dämmelement.The subject matter of the invention is shown in an exemplary embodiment in the drawings shown, namely show: Fig. 1 a press for producing completed Insulating elements with the additional use of an IIF field, Fig. 2 shows a press for the production of completed insulation elements with effective outside of the press IlF-reld, Fig. 3 a completed insulating element.

Fig. 1 zeigt eine aus einer Patrize 12 und einer Matrize 13 bestehende Presse 16 zur Herstellung von selbsttragenden komplettierten Dämmelementen 15 ( Fig. 3). In der Patrize 13 liegt das unverfestigte Faservlies 14. Zwischen patrize 13 und Patrize 12 liegt der unterseitig mit Klebstoff 11 versehene Bezugsstoff 10, der erbindungsgemäß auch aus PVC-Material bestehen kann. Antrize 13 and Patrize 12 sind als übertragungselemente far ein Hochfrequenzfeld ausgebildet und zu diesem Zweck über Leitungen 18 und 18' mit einem Hochfrequenzgenerator 19 verbunden.1 shows one consisting of a male mold 12 and a female mold 13 Press 16 for the production of self-supporting complete insulation elements 15 ( Fig. 3). The unconsolidated fiber fleece 14 lies in the male mold 13 between the male mold 13th and the male part 12 is the one provided with adhesive 11 on the underside Cover material 10, which according to the invention can also consist of PVC material. Impulses 13 and male mold 12 are designed as transmission elements for a high-frequency field and for this purpose via lines 18 and 18 'with a high-frequency generator 19 tied together.

In einer weiteren Ausführungsform können die das Hochfrequenzfeld übertragenden Elemente 20 und 21 außerhalb der Presse 16 angeordnet sein, wobi hier in der ersten Arbeitsphase die HF-Ecwärmung des Faservlieses 14 erfolgt und nachfolgend das sich in der Patrize 13 befindliche Faservlies über eine Transportanlage, z. L. Rollenbahn 22 in den Pressenraum geschoben wird, wo die bekannte Enderwärmung und Pressung durchgefährt wird.In a further embodiment, the high-frequency field transmitting elements 20 and 21 be arranged outside the press 16, wobi here In the first working phase, the HF heating of the nonwoven fabric 14 takes place and subsequently the nonwoven fabric located in the male mold 13 via a transport system, e.g. L. Roller conveyor 22 is pushed into the press room, where the known final heating and pressing is carried out.

Das erfindungsgemäße Verfahren kann sooil auf geometrisch regelmäßige als auch unregelmäßige Körper angewendet werden, wobei bei letzteren .lie Stärke des Hochfrequenzfeldes der unterschiedlichen Gestaltung angepaßt werden kann.The inventive method can sooil on geometrically regular as well as irregular bodies, with the latter .lie strength of the high frequency field can be adapted to the different design.

Claims (4)

Kennwort: "BF-Komplettierung A n s p r ü c h e: 1. Verfahren zur Herstellunj- von aus einem Faservlies und einem Bezugsstoff bestehenden kompletten Dämmelement mit in Faservlies eingebrachten 3indeharzen nd mit unterseitig des Bezugsstoffes aufgetragencm Klebstoff nach Patent.... (Patentanmeluung P 2 711 376.4), wobei während des Formens und Härtens des mit Bindeharz versehenen Faservlieses durch Pressen und Lrwarmung zugleich der i3ezugsstoff mitverformt und mit dem Faservlies verklebt wird, d a d u r c h g e k e n n z e i c h n e t , daß zur Aushärtung des Bindeharzes das Faservlies zusätzlich durch ein Hochfrequenzfeld erwärmt wird. Password: "BF-Completion A n p r ü c h e: 1. Procedure for Manufacture of a complete consisting of a fiber fleece and a cover fabric Insulation element with 3-in-one resins incorporated into the fiber fleece and with the underside of the upholstery fabric applied cm adhesive according to patent .... (patent application P 2 711 376.4), whereby during molding and curing the binder resin-provided nonwoven fabric by pressing and noise at the same time the upholstery fabric is deformed and glued to the nonwoven fabric is, d u r g e k e n n n z e i c h n e t, that for the hardening of the binding resin the fiber fleece is additionally heated by a high-frequency field. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Hochfrequenzerwärmung des Faservlieses in einer geheizten Presse durchgef ührt wird.2. The method according to claim 1, characterized in that the high-frequency heating the fiber fleece is carried out in a heated press. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die ilochfrequenzerwä.rmung des Faservlieses vor der Erwärmung in einer geheizten Presse durchgeführt wird.3. The method according to claim 1, characterized in that the ilochfrequenzerwä.rmung the nonwoven fabric is carried out in a heated press prior to heating. 4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der Bezugsstoff oberflächig im Bereich einer vorgegebenen Grenzteinperatur gehalten wird.4. The method according to claims 1 to 3, characterized in that that the upholstery fabric is kept superficially in the range of a predetermined limit temperature will.
DE2727701A 1977-06-21 1977-06-21 Method for producing an insulating element Expired DE2727701C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2727701A DE2727701C2 (en) 1977-06-21 1977-06-21 Method for producing an insulating element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2727701A DE2727701C2 (en) 1977-06-21 1977-06-21 Method for producing an insulating element

Publications (2)

Publication Number Publication Date
DE2727701A1 true DE2727701A1 (en) 1979-01-04
DE2727701C2 DE2727701C2 (en) 1984-04-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0085319A1 (en) * 1982-01-30 1983-08-10 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Arrangement for capacitative heating and its use
EP0320837A2 (en) * 1987-12-17 1989-06-21 BASF Aktiengesellschaft Method for discontinuously producing moulded fibre-reinforced plastic articles

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
DE2143380A1 (en) * 1971-08-26 1973-03-15 Licentia Gmbh Record pressing - using dielectric materials with hf generator and coolant system

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
DE2143380A1 (en) * 1971-08-26 1973-03-15 Licentia Gmbh Record pressing - using dielectric materials with hf generator and coolant system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0085319A1 (en) * 1982-01-30 1983-08-10 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Arrangement for capacitative heating and its use
EP0320837A2 (en) * 1987-12-17 1989-06-21 BASF Aktiengesellschaft Method for discontinuously producing moulded fibre-reinforced plastic articles
EP0320837A3 (en) * 1987-12-17 1990-07-04 BASF Aktiengesellschaft Method for discontinuously producing moulded fibre-reinforced plastic articles

Also Published As

Publication number Publication date
DE2727701C2 (en) 1984-04-05

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