EP0535445A2 - Highfrequency dielectric heating oven with continuous movement of material - Google Patents

Highfrequency dielectric heating oven with continuous movement of material Download PDF

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Publication number
EP0535445A2
EP0535445A2 EP92115808A EP92115808A EP0535445A2 EP 0535445 A2 EP0535445 A2 EP 0535445A2 EP 92115808 A EP92115808 A EP 92115808A EP 92115808 A EP92115808 A EP 92115808A EP 0535445 A2 EP0535445 A2 EP 0535445A2
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EP
European Patent Office
Prior art keywords
electrode
transport
electrodes
frequency
arranged above
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.)
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Application number
EP92115808A
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German (de)
French (fr)
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EP0535445A3 (en
Inventor
Bernd Böhnke
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H Krantz GmbH and Co
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H Krantz GmbH and Co
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Publication date
Application filed by H Krantz GmbH and Co filed Critical H Krantz GmbH and Co
Publication of EP0535445A2 publication Critical patent/EP0535445A2/en
Publication of EP0535445A3 publication Critical patent/EP0535445A3/en
Withdrawn legal-status Critical Current

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    • 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
    • H05B6/64—Heating using microwaves
    • 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
    • H05B6/54—Electrodes

Definitions

  • the invention relates to a device for high-frequency treatment of material, consisting of a device with which the material is continuously transported through a high-frequency field. Electrodes arranged above and below the transport plane generate the high-frequency field.
  • Such high-frequency capacitive devices are generally known, for example, for the thermal treatment of textile material.
  • EP 0 105 174 B1 describes a high-frequency device from a continuous furnace for thermal treatment, in particular of synthetic fiber cables.
  • the synthetic fiber cables are transported through the device via a grounded metallic conveyor belt, which acts as an electrode.
  • a radio-frequency electrode is provided at a distance above the conveyor belt and is connected to a radio-frequency generator via a coupling capacitor.
  • High-frequency devices of this type have proven themselves well for the thermal treatment of a wide variety of materials.
  • the possible heating power of the respective device is, among other things, substantially limited by the permissible field strength above which electrical breakdowns can occur. If the material to be treated contains an electrically conductive liquid, the risk of electrical breakdown occurs even with a relatively low field strength.
  • the structural dimensions of the device inevitably increase inversely proportional to the permissible field strength. Limiting the field strength therefore forces the device to be enlarged if the specified treatment performance is to be maintained or even increased.
  • the interior of the known device is pressurized between 1, 5 and 6 bar and is connected to a gas source. If the overpressure in the interior of the device drops below a predetermined value, the voltage of the high-frequency generator is automatically reduced or switched off. Since the breakdown field strength is largely proportional to the pressure, the energy density that can be implemented per device unit can be increased in this way without the risk of breakdown.
  • Maintaining an overpressure in the interior of the device is, however, associated with considerable effort, especially since, in the case of continuous operation of the device for material introduction and removal, corresponding openings have to be provided in the device housing, which have to be equipped with sealing locks so that an overpressure in the housing build up and maintain.
  • the invention is based on the object of designing a device of the type described in the introduction in such a way that, despite a high energy density, improved rollover security is to be ensured without dispensing with excess pressure inside the device.
  • Electrodes arranged on both sides of the material's transport plane have the disadvantage that, in the event of high-voltage flashovers, damage to the material to be treated and possibly also to the conveyor belt occur.
  • the rollovers usually go through the material to be treated and the conveyor belt.
  • burns can be observed directly in front of the electrodes even with small field thicknesses.
  • the above-mentioned field reflections are responsible for this, which lead to large internal field strengths and thus considerable tension differences between the relatively closely spaced material surfaces. This often cuts the material downright.
  • each electrode has an electrode with the same polarity on the opposite side of the material to be treated. As a result, tension differences within the material can no longer occur and material burns can be avoided.
  • the electrodes consist of electrode rods arranged parallel to one another and extending perpendicular to the direction of transport of the material.
  • the electrode rods of a pair of electrodes are arranged in a plane perpendicular to the transport direction and are connected to a coupling piece on at least one side of the transport device.
  • an embodiment of the invention provides that each electrode rod arranged above the transport plane is provided at both ends with a coupling piece pointing downwards, to which the ends of the electrode rod arranged below each are connected.
  • material to be exposed to a high-frequency field runs continuously in the direction of an arrow 2 through a treatment device, which is otherwise not shown.
  • the high-frequency field is generated by rod-shaped electrodes 3, 4 and 5, 6, respectively, which are aligned above and below the transport plane 1 and perpendicular to the transport direction.
  • the electrodes 3 above the transport plane 1 are connected to the electrodes 5 below the transport plane 1 via coupling pieces 7 at their ends and connected to a generator 9 via a common line 8.
  • the electrodes 4 above the transport plane 1 are connected to the electrodes 6 below the transport plane 1 via coupling pieces 10 at their ends and also connected to the generator 9 via a common line 11.

Abstract

A device is proposed for the radio-frequency treatment of material, in the case of which device electrodes (3, 4, 5, 6) are arranged above and below a transportation level (1) of the material. In order to ensure adequate breakdown safety in the case of a high energy density, it is proposed to connect each electrode (3, 4) which is arranged above the transportation level (1) to an electrode (5, 6) which is arranged under the transportation level (1). The electrode pairs (3, 5 and 4, 6) which are thus formed follow one another alternately in the transportation direction and are connected via in each case one line (8, 11) to a radio-frequency generator (9). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur Hochfrequenzbehandlung von Material, bestehend aus einer Einrichtung, mit der das Material kontinuierlich durch ein Hochfrequenzfeld transportiert wird. Dabei erzeugen ober- und unterhalb der Transportebene angeordnete Elektroden das Hochfrequenzfeld.The invention relates to a device for high-frequency treatment of material, consisting of a device with which the material is continuously transported through a high-frequency field. Electrodes arranged above and below the transport plane generate the high-frequency field.

Derartige kapazitive Hochfrequenzvorrichtungen sind beispielsweise zur thermischen Behandlung von Textilmaterial allgemein bekannt. In der EP 0 105 174 B1 ist eine Hochfrequenzvorrichtung aus einem Durchlaufofen zur thermischen Behandlung insbesondere von Chemiefaserkabeln beschrieben. Über ein geerdetes metallisches Förderband, welches als Elektrode wirkt, werden die Chemiefaserkabel durch die Vorrichtung transportiert. In einem Abstand Über dem Förderband ist eine Hochfrequenzelektrode vorgesehen, die über einen Koppelkondensator mit einem Hochfrequenzgenerator verbunden ist.Such high-frequency capacitive devices are generally known, for example, for the thermal treatment of textile material. EP 0 105 174 B1 describes a high-frequency device from a continuous furnace for thermal treatment, in particular of synthetic fiber cables. The synthetic fiber cables are transported through the device via a grounded metallic conveyor belt, which acts as an electrode. A radio-frequency electrode is provided at a distance above the conveyor belt and is connected to a radio-frequency generator via a coupling capacitor.

Hochfrequenzvorrichtungen dieser Art haben sich gut zur thermischen Behandlung der verschiedensten Materialien bewährt. Die mögliche Erwärmungsleistung der jeweiligen Vorrichtung ist aber u.a. wesentlich durch die zulässige Feldstärke beschränkt, oberhalb der elektrische Durcnschläge auftreten können. Enthält das zu behandelnde Material eine elektrisch leitende Flüssigkeit, so tritt die Gefahr elektrischer Durchschläge bereits bei einer verhältnismäßig geringen Feldstärke auf.High-frequency devices of this type have proven themselves well for the thermal treatment of a wide variety of materials. The possible heating power of the respective device is, among other things, substantially limited by the permissible field strength above which electrical breakdowns can occur. If the material to be treated contains an electrically conductive liquid, the risk of electrical breakdown occurs even with a relatively low field strength.

Bei vorgegebener Behandlungsleistung vergrößern sich zwangsläufig die baulichen Abmessungen der Vorrichtung umgekehrt proportional zur zulässigen Feldstärke. Die Begrenzung der Feldstärke zwingt daher zu einer Vergrößerung der Vorrichtung, wenn die angegebene Behandlungsleistung beibehalten oder gar gesteigert werden soll.For a given treatment performance, the structural dimensions of the device inevitably increase inversely proportional to the permissible field strength. Limiting the field strength therefore forces the device to be enlarged if the specified treatment performance is to be maintained or even increased.

Um bei der in der EP 0 105 174 B1 beschriebenen Vorrichtung bei gegebenen Abmessungen die zugeführten elektrischen Leistungen steigern bzw. die Vorrichtungsabmessungen verringen zu können und dennoch in jedem Falle einen sicheren elektrischen Betrieb zu gewährleisten, wird der Innenraum der bekannten Vorrichtung unter Überdrücke zwischen 1,5 und 6 bar gesetzt und ist dazu mit einer Gasquelle verbunden. Bei einem Absinken des Überdrucks im Innenraum der Vorrichtung unter einen vorgegebenen Wert wird die Spannung des Hochfrequenzgenerators selbsttätig verringert oder abgeschaltet. Da die Durchschlagsfeldstärke weitgehend dem Druck proportional ist, läßt sich auf diese Weise die pro Vorrichtungseinheit umsetzbare Energiedichte ohne die Gefahr eines Durchschlages erhöhen.In order to be able to increase the supplied electrical powers or to reduce the device dimensions in the case of the given dimensions in the device described in EP 0 105 174 B1 and nevertheless to ensure safe electrical operation in any case, the interior of the known device is pressurized between 1, 5 and 6 bar and is connected to a gas source. If the overpressure in the interior of the device drops below a predetermined value, the voltage of the high-frequency generator is automatically reduced or switched off. Since the breakdown field strength is largely proportional to the pressure, the energy density that can be implemented per device unit can be increased in this way without the risk of breakdown.

Die Aufrechterhaltung eines Überdruckes im Innenraum der Vorrichtung ist jedoch mit einem erheblichen Aufwand verbunden, zumal bei einer kontinuierlichen Betriebsweise der Vorrichtung für die Materialein- und -ausbringung entsprechende Öffnungen im Vorrichtungsgehäuse vorzusehen sind, die mit Dichtungsschleusen ausgestattet werden müssen, damit sich ein Überdruck im Gehäuse aufbauen und aufrechterhalten läßt.Maintaining an overpressure in the interior of the device is, however, associated with considerable effort, especially since, in the case of continuous operation of the device for material introduction and removal, corresponding openings have to be provided in the device housing, which have to be equipped with sealing locks so that an overpressure in the housing build up and maintain.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs beschriebenen Art so auszubilden, daß trotz einer hohen Energiedichte eine verbesserte Überschlagsicherheit unter Verzicht auf einen Überdruck im Vorrichtungsinnern zu gewährleisten ist.The invention is based on the object of designing a device of the type described in the introduction in such a way that, despite a high energy density, improved rollover security is to be ensured without dispensing with excess pressure inside the device.

Zur Lösung dieser Aufgabe wird von einer Vorrichtung der im Oberbegriff des Anspruchs 1 genannten gattungsgemäßen Art ausgegangen, welche erfindungsgemäß die in seinem kennzeichenden Teil angegebenen Merkmale aufweist.To achieve this object, a device of the generic type mentioned in the preamble of claim 1 is assumed, which according to the invention has the features specified in its characterizing part.

Bei der erfindunsgemäßen paarweisen Verbindung von jeweils einer ober- und einer unterhalb der Transportebene angeordneten Elektrode und der abwechselnden Kupplung der in Transportrichtung aufeinanderfolgenden Elektrodenpaare wird eine sogenannte Feldspiegelung vermieden, welche das Auftreten von Überschlägen begünstigt. Ein- wie beidseitig zur Transportebene des Materials angeordnete Elektroden haben nämlich den Nachteil, daß im Falle von Hochspannungsüberschlägen Beschädigungen am zu behandelnden Material und gegebenenfalls auch am Transportband auftreten. Die Überschläge gehen in der Regel durch das zu behandelnde Material und das Transportband hindurch. Besonders bei elektrisch leitfähigen Materialien sind bereits bei geringen Felstärken Verbrennungen direkt vor den Elektroden zu verzeichnen. Verantwortlich dafür sind die vorerwähnten Feldspiegelungen, die zu großen inneren Feldstärken und damit erheblichen Spannungsdifferenzen zwischen den relativ dicht beieinander liegenden Materialoberflächen führen. Dadurch wird das Material häufig regelrecht durchschnitten.In the case of the paired connection of an electrode arranged above and below the transport plane and the alternating coupling of the electrode pairs which follow one another in the transport direction, a so-called field reflection is avoided, which favors the occurrence of flashovers. Electrodes arranged on both sides of the material's transport plane have the disadvantage that, in the event of high-voltage flashovers, damage to the material to be treated and possibly also to the conveyor belt occur. The rollovers usually go through the material to be treated and the conveyor belt. In the case of electrically conductive materials in particular, burns can be observed directly in front of the electrodes even with small field thicknesses. The above-mentioned field reflections are responsible for this, which lead to large internal field strengths and thus considerable tension differences between the relatively closely spaced material surfaces. This often cuts the material downright.

Die erfindungsgemäße Anordnung vermeidet die Feldspiegelung, indem jeder Elektrode jeweils eine gleichgepolte Elektrode auf der gegenüberliegenden Seite des zu behandelnden Materials gegenüberliegt. Dadurch können Spannungsdifferenzen innerhalb des Materials nicht mehr auftreten und Materialverbrennungen vermieden werden.The arrangement according to the invention avoids field mirroring in that each electrode has an electrode with the same polarity on the opposite side of the material to be treated. As a result, tension differences within the material can no longer occur and material burns can be avoided.

Nach einer Ausgestaltung der erfindungsgemäßen Vorrichtung bestehen die Elektroden aus parallel zueinander angeordneten, sich senkrecht zur Transportrichtung des Materials erstreckenden Elektrodenstäben.According to one embodiment of the device according to the invention, the electrodes consist of electrode rods arranged parallel to one another and extending perpendicular to the direction of transport of the material.

Nach einer weiteren Ausgestaltung der Erfindung sind die Elektrodenstäbe eines Elektrodenpaares in einer zur Transportrichtung senkrechten Ebene angeordnet und auf mindestens einer Seite der Transporteinrichtung mit einem Kupplungsstück verbunden.According to a further embodiment of the invention, the electrode rods of a pair of electrodes are arranged in a plane perpendicular to the transport direction and are connected to a coupling piece on at least one side of the transport device.

Schließlich sieht eine Ausgestaltung der Erfindung noch vor, daß jeder oberhalb der Transportebene angeordnete Elektrodenstab an seinen beiden Enden mit je einem nach unten weisenden Kupplungsstück versehen ist, woran die Enden des jeweils darunter angeordneten Elektrodenstabes angeschlossen sind.Finally, an embodiment of the invention provides that each electrode rod arranged above the transport plane is provided at both ends with a coupling piece pointing downwards, to which the ends of the electrode rod arranged below each are connected.

In der Zeichnung ist ein Ausführungsbeispiel einer Elektrodenanordnung für eine erfindungsgemäße Vorrichtung schematisch dargestellt. Es zeigt:

Fig. 1
die Anordnung in einer Seitenansicht und
Fig. 2
die Anordnung im Schnitt nach der Linie II-II der Fig. 1.
In the drawing, an embodiment of an electrode arrangement for a device according to the invention is shown schematically. It shows:
Fig. 1
the arrangement in a side view and
Fig. 2
the arrangement in section along the line II-II of FIG. 1st

In einer strichpunktiert dargestellten Transportebene 1 läuft kontinuierlich in Richtung eines Pfeiles 2 einem Hochfrequenzfeld auszusetzendes Material durch eine im übrigen nicht dargestellte Behandlungsvorrichtung.In a transport plane 1 shown in dash-dotted lines, material to be exposed to a high-frequency field runs continuously in the direction of an arrow 2 through a treatment device, which is otherwise not shown.

Das Hochfrequenzfeld wird durch ober- und unterhalb der Transportebene 1 und senkrecht zur Transportrichtung ausgerichtete stabförmige Elektroden 3, 4 bzw. 5, 6 erzeugt. Dabei sind die Elektroden 3 oberhalb der Transportebene 1 mit den Elektroden 5 unterhalb der Transportebene 1 jeweils über Kupplungsstücke 7 an ihren Enden miteinander verbunden und über eine gemeinsame Leitung 8 an einen Generator 9 angeschlossen. In gleicher Weise sind die Elektroden 4 oberhalb der Transportebene 1 mit den Elektroden 6 unterhalb der Transportebene 1 jeweils über Kupplungsstücke 10 an ihren Enden miteinander verbunden und ebenso über eine gemeinsame Leitung 11 an den Generator 9 angeschlossen.The high-frequency field is generated by rod-shaped electrodes 3, 4 and 5, 6, respectively, which are aligned above and below the transport plane 1 and perpendicular to the transport direction. The electrodes 3 above the transport plane 1 are connected to the electrodes 5 below the transport plane 1 via coupling pieces 7 at their ends and connected to a generator 9 via a common line 8. In the same way, the electrodes 4 above the transport plane 1 are connected to the electrodes 6 below the transport plane 1 via coupling pieces 10 at their ends and also connected to the generator 9 via a common line 11.

Durch Versuche konnte nachgewiesen werden, daß bereits mit einem nicht optimierten Stabfeld der vorbeschriebenen Anordnung bei gleicher Überschlagsicherheit eine zwei- bis dreifach höhere Energiedichte erreichbar ist.Experiments have shown that even with a non-optimized rod field of the arrangement described above, a two to three times higher energy density can be achieved with the same rollover security.

Claims (4)

Vorrichtung zur Hochfrequenzbehandlung von Material, bestehend aus einer Einrichtung, mit der das Material kontinuierlich durch ein Hochfrequenzfeld transportiert wird, das durch ober- und unterhalb der Transportebene angeordnete Elektroden erzeugt wird, dadurch gekennzeichnet, daß jede oberhalb der Transportebene (1) angeordnete Elektrode (3, 4) mit einer unterhalb der Transportebene (1) angeordneten Elektrode (5, 6) verbunden ist, die so gebildeten, in Transportrichtung aufeinanderfolgenden Elektrodenpaare (3, 5 und 4, 6) abwechselnd miteinander verbunden sind und die beiden so gebildeten Gruppen von Elektrodenpaaren (3, 5 und 4, 6) über je eine Leitung (8, 11) an einen Hochfrequenzgenerator (9) angeschlossen sind.Device for the high-frequency treatment of material, comprising a device with which the material is continuously transported through a high-frequency field which is generated by electrodes arranged above and below the transport plane, characterized in that each electrode (3) arranged above the transport plane (1) , 4) is connected to an electrode (5, 6) arranged below the transport plane (1), the electrode pairs (3, 5 and 4, 6) formed in this way, which are successive in the transport direction, are alternately connected to one another and the two groups of electrode pairs thus formed (3, 5 and 4, 6) are each connected via a line (8, 11) to a high-frequency generator (9). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Elektroden (3, 4, 5, 6) aus parallel zueinander angeordneten, sich senkrecht zur Transportrichtung des Materials erstreckenden Elektrodenstäben bestehen.Device according to claim 1, characterized in that the electrodes (3, 4, 5, 6) consist of electrode rods arranged parallel to one another and extending perpendicular to the direction of transport of the material. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Elektrodenstäbe eines Elektrodenpaares (3, 5 und 4, 6) in einer zur Transportrichtung senkrechten Ebene angeordnet sind und auf mindestens einer Seite der Transporteinrichtung mit einem Kupplungsstück (7, 10) verbunden sind.Apparatus according to claim 1 or 2, characterized in that the electrode rods of a pair of electrodes (3, 5 and 4, 6) are arranged in a plane perpendicular to the direction of transport and are connected to a coupling piece (7, 10) on at least one side of the transport device. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß jeder oberhalb der Transportebene (1) angeordnete Elektrodenstab (3, 4) an seinen beiden Enden mit je einem nach unten weisenden Kupplungsstück (7, 10) versehen ist, woran die Enden des jeweils darunter angeordneten Elektrodenstabes angeschlossen sind.Device according to one of claims 1 to 3, characterized in that each electrode rod (3, 4) arranged above the transport plane (1) is provided at its two ends with a coupling piece (7, 10) pointing downwards, against which the ends of the each arranged below the electrode rod are connected.
EP19920115808 1991-10-02 1992-09-16 Highfrequency dielectric heating oven with continuous movement of material Withdrawn EP0535445A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4132769A DE4132769A1 (en) 1991-10-02 1991-10-02 DEVICE FOR HIGH-FREQUENCY TREATMENT OF MATERIAL
DE4132769 1991-10-02

Publications (2)

Publication Number Publication Date
EP0535445A2 true EP0535445A2 (en) 1993-04-07
EP0535445A3 EP0535445A3 (en) 1993-08-04

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EP19920115808 Withdrawn EP0535445A3 (en) 1991-10-02 1992-09-16 Highfrequency dielectric heating oven with continuous movement of material

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EP (1) EP0535445A3 (en)
JP (1) JPH05205863A (en)
KR (1) KR930009468A (en)
DE (1) DE4132769A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0651590A2 (en) * 1993-10-27 1995-05-03 STALAM S.r.l. Radio-frequency heating device for dielectric materials
EP1386710A1 (en) * 2001-05-09 2004-02-04 Nissei Kabushiki Kaisha Method of manufacturing hot formed object, and device and method for continuous high-frequency heating.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE709448C (en) * 1939-12-14 1941-08-16 Siemens Schuckertwerke Akt Ges Device for the heat treatment of materials by means of electrical high frequency
DE892357C (en) * 1944-09-01 1953-10-05 Siemens Ag Arrangement for the treatment of bodies in electrical or magnetic high-frequency alternating fields
DE921474C (en) * 1948-10-02 1954-12-20 Siemens Ag Device for the dielectric treatment of a strip or thread-like item to be treated
NL6405226A (en) * 1963-05-10 1964-11-11
US4148346A (en) * 1976-06-14 1979-04-10 Scarnecchia O Vincent Method of and apparatus for drying and debarking logs
FR2440674A1 (en) * 1978-11-03 1980-05-30 Matra Heater for processing thermally sensitive paper - has electrodes providing HF field parallel to sliding plane of paper

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE709448C (en) * 1939-12-14 1941-08-16 Siemens Schuckertwerke Akt Ges Device for the heat treatment of materials by means of electrical high frequency
DE892357C (en) * 1944-09-01 1953-10-05 Siemens Ag Arrangement for the treatment of bodies in electrical or magnetic high-frequency alternating fields
DE921474C (en) * 1948-10-02 1954-12-20 Siemens Ag Device for the dielectric treatment of a strip or thread-like item to be treated
NL6405226A (en) * 1963-05-10 1964-11-11
US4148346A (en) * 1976-06-14 1979-04-10 Scarnecchia O Vincent Method of and apparatus for drying and debarking logs
FR2440674A1 (en) * 1978-11-03 1980-05-30 Matra Heater for processing thermally sensitive paper - has electrodes providing HF field parallel to sliding plane of paper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
RADIO AND ELECTRONIC ENGINEER Bd. 46, Nr. 3, März 1976, LONDON GB Seiten 117 - 120 J. LAWTON 'Radio-frequency drying of non-metallic materials.' *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0651590A2 (en) * 1993-10-27 1995-05-03 STALAM S.r.l. Radio-frequency heating device for dielectric materials
EP0651590A3 (en) * 1993-10-27 1995-09-27 Stalam Srl Radio-frequency heating device for dielectric materials.
EP1386710A1 (en) * 2001-05-09 2004-02-04 Nissei Kabushiki Kaisha Method of manufacturing hot formed object, and device and method for continuous high-frequency heating.
EP1386710A4 (en) * 2001-05-09 2005-12-14 Nissei Kk Method of manufacturing hot formed object, and device and method for continuous high-frequency heating.

Also Published As

Publication number Publication date
JPH05205863A (en) 1993-08-13
KR930009468A (en) 1993-05-22
EP0535445A3 (en) 1993-08-04
DE4132769A1 (en) 1993-04-08

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