EP0234608B1 - Manufacturing method of a self-regulating heating element - Google Patents

Manufacturing method of a self-regulating heating element Download PDF

Info

Publication number
EP0234608B1
EP0234608B1 EP87200052A EP87200052A EP0234608B1 EP 0234608 B1 EP0234608 B1 EP 0234608B1 EP 87200052 A EP87200052 A EP 87200052A EP 87200052 A EP87200052 A EP 87200052A EP 0234608 B1 EP0234608 B1 EP 0234608B1
Authority
EP
European Patent Office
Prior art keywords
casing
elastomer
heating element
resistor
manufacturing
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 - Lifetime
Application number
EP87200052A
Other languages
German (de)
French (fr)
Other versions
EP0234608A1 (en
Inventor
André Marcel Alfred Van Bokestal
Henri Louis Lorrain
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0234608A1 publication Critical patent/EP0234608A1/en
Application granted granted Critical
Publication of EP0234608B1 publication Critical patent/EP0234608B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H05B3/00—Ohmic-resistance heating
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic

Definitions

  • the invention relates to a method for producing a self-regulating heating element which has at least one resistance body made of a material with a positive temperature coefficient of electrical resistance (also referred to as PTC resistor) as the heat source.
  • PTC resistor positive temperature coefficient of electrical resistance
  • Such a heating element is known from DE-C3-26 14 433, which is characterized in that the resistance body or the resistance bodies lies or lie between metal bodies which are on the side of the inner wall facing away from the resistance body or the resistance bodies Wrap in heat-exchanging contact.
  • the covering can consist of glass, ceramic or a thermally highly conductive elastic plastic, if desired in a metal outer covering.
  • the vulcanized plastic is preferably silicone rubber.
  • Magnesium oxide, trivalent iron oxide or aluminum oxide can be used as the heat-conducting metal compound, and silicon dioxide can be used as the filler.
  • EP-A2- 00 08 235 describes a self-regulating heating element in the form of a flexible heating cable, the resistance body being made of semiconducting polymer material.
  • DE-A1- 31 04 608 discloses a heating element in which the ceramic resistance body is embedded in a plastic casting compound.
  • FR-A-2 292 395 describes a heating element with several ceramic resistance bodies.
  • the heating element comprises a metallic covering in which there is a second covering made of insulating material.
  • DE-A-17 65 622 and GB-A-1 191 732 relate to methods for applying base layers to heating cables.
  • Pressing the mating parts of the casing, one part of which is pushed into the other, or pressing a pressed part with a second material, are processes which are practically difficult to carry out and which cannot be automated.
  • Another possibility is to wrap the whole thing from PTC resistors with the enveloping metal parts in an insulating plastic film, for example made of polyimide, before this whole thing is pushed into the pressed casing. This process is also complex.
  • the invention provides a method for producing a self-regulating heating element which, as a heat source, has at least one resistance body made of a material with a positive temperature coefficient of electrical resistance, the resistance body or the resistance bodies being arranged between metal parts on which the resistance body is located or the side facing away from the resistance bodies on the inner wall of a cylindrical cover, which is closed at one end and which consists of vulcanized thermoplastic material, are arranged in heat-exchanging contact, characterized in that the cover is produced by the pressing process and that the cover has a layer on its inner wall an elastomer, the elastomer being attached by filling the pressed envelope with a solution of the elastomer, emptying the envelope and then heating it to remove the solvent t and the elastomer is polymerized.
  • the invention further provides a method for producing a self-regulating heating element which, as a heat source, has at least one resistance body made of a material with a positive temperature coefficient of electrical resistance, the resistance body or the resistance bodies being arranged between metal parts on which the Resistance bodies or the side facing away from the resistance bodies are arranged in heat-exchanging contact on the inner wall of a cylindrical covering which is closed at one end and which consists of vulcanized thermoplastic material, characterized in that the covering is produced by the pressing process and that the covering has a layer on its inner wall comprises an elastomer, the elastomer being attached by immersing the pressed covering in a solution of the elastomer and removing the covering therefrom and by making the superfluous solution drains, after which the casing is heated so that the solvent is removed and the elastomer is polymerized.
  • the method according to the invention is characterized in that a layer of an elastomer is applied by means of a solution on the inside and / or outside of a covering produced by the pressing method.
  • the elastomer is applied by means of a solution in the form of a layer.
  • the elastomer preferably has a viscosity that is higher than that of the pressed part and varies from 200 mPa / s to 1,000,000 mPa / s. This means that the layer has a higher elasticity than the pressed part.
  • the elastomer may be of a two-component addition polymerized silicone resin type or a condensation polymerized elastomer type.
  • a solution in a simple solvent or a mixture of solvents is assumed, which is allowed to evaporate after the application.
  • Fillers such as metal oxides, which have a higher thermal conductivity, dyes or stabilizers can also be added to the solution of the elastomer.
  • a layer is pressed on the outside Partly must be attached, this can be done in the immersion process.
  • An inner layer is obtained by filling the pressed part with the relevant material and then emptying it again, a layer forming on the walls. It is usually advisable to vibrate the solution during contact so that a layer with a constant thickness is obtained. After the attachment, it is dried and heated so that it is polymerized further.
  • the method according to the invention offers many advantages; the transport of the pressed casing to a filling device or to a dipping device can be easily automated. Furthermore, the diameter of the element can be reduced to less than 8 mm, which gives it a practically interesting range of dimensions. In addition, if the pressed part of the casing breaks due to a defect, the more elastic second casing attached by means of a liquid remains effective and loosens locally from the pressed part during the crack, so that no current-carrying metal parts are released.
  • 1 and 2 are 1 and 2 resistance bodies with a positive temperature gradient of the resistance. These resistance bodies are clamped between two semi-cylindrical metal bodies 3 and 4, which consist for example of aluminum.
  • Fig. 3 shows a heating element corresponding to Fig. 1, but in which the layer 5 on the inside of the pressed part has been replaced by a similar layer 9 on the outside thereof.

Landscapes

  • Resistance Heating (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Surface Heating Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines selbstregelnden Heizelementes, das als Wärmequelle mindestens einen Widerstandskörper aus einem Material mit einem positiven Temperaturkoeffizienten des elektrischen Widerstandes (weiterhin als PTC-Widerstand bezeichnet) aufweist.The invention relates to a method for producing a self-regulating heating element which has at least one resistance body made of a material with a positive temperature coefficient of electrical resistance (also referred to as PTC resistor) as the heat source.

Aus der DE-C3-26 14 433 ist ein derartiges Heizelement bekannt, das dadurch gekennzeichnet ist, dass der Widerstandskörper oder die Widerstandskörper zwischen metallenen Körpern liegt bzw. liegen, die auf der von dem Widerstandskörper bzw. den Widerstandskörpern abgewandten Seite an der Innenwand einer Umhüllung in wärmeaustauschendem Kontakt anliegen.Such a heating element is known from DE-C3-26 14 433, which is characterized in that the resistance body or the resistance bodies lies or lie between metal bodies which are on the side of the inner wall facing away from the resistance body or the resistance bodies Wrap in heat-exchanging contact.

Nach dieser Offenlegungsschrift kann die Umhüllung aus Glas, Keramik oder aus einem thermisch gut leitenden elastischen Kunststoff bestehen, gewünschtenfalls in einer metallenen Aussenumhüllung.According to this published specification, the covering can consist of glass, ceramic or a thermally highly conductive elastic plastic, if desired in a metal outer covering.

Das in der Praxis bewährteste Material für die Umhüllung ist in der DE-B2-26 41 894 beschrieben und besteht aus einem bei der höchsten Betriebstemperatur des Elementes beständigen vulkanisierten Kunststoff, einer elektrisch isolierende wärmeleitenden Metallverbindung und gewünschtenfalls einem anderen Füllmittel.The most tried and tested material for the casing is described in DE-B2-26 41 894 and consists of a vulcanized plastic that is resistant to the highest operating temperature of the element, an electrically insulating, heat-conducting metal compound and, if desired, another filler.

Vorzugsweise ist der vulkanisierte Kunststoff Silikonkautschuk. Als wärmeleitende Metallverbindung kann Magnesiumoxid, dreiwertiges Eisenoxid oder Aluminiumoxid, und als Füllmittel Siliciumdioxid verwendet werden.The vulcanized plastic is preferably silicone rubber. Magnesium oxide, trivalent iron oxide or aluminum oxide can be used as the heat-conducting metal compound, and silicon dioxide can be used as the filler.

EP-A2- 00 08 235 beschreibt ein selbstregelndes Heizelement im Form eines flexibelen Heizkabels, wobei der Widerstandkörper aus halbleitendem Polymermaterial besteht. DE-A1- 31 04 608 offenbart ein Heizelement in dem der keramische Widerstandskörper in einer Kunststoffverguß masse eingebettet ist. FR-A- 2 292 395 beschreibt ein Heizelement mit mehreren keramischen Widerstandskörpern. Das Heizelement umfasst eine metallische Umhüllung in dem sich eine zweite Umhüllung aus Isoliermaterial befindet. DE-A- 17 65 622 und GB-A-1 191 732 beziehen sich auf Verfahren zum Auftragen von Tragschichten bei Heizkabeln.EP-A2- 00 08 235 describes a self-regulating heating element in the form of a flexible heating cable, the resistance body being made of semiconducting polymer material. DE-A1- 31 04 608 discloses a heating element in which the ceramic resistance body is embedded in a plastic casting compound. FR-A-2 292 395 describes a heating element with several ceramic resistance bodies. The heating element comprises a metallic covering in which there is a second covering made of insulating material. DE-A-17 65 622 and GB-A-1 191 732 relate to methods for applying base layers to heating cables.

Aus Sicherheitsgründen ist es nun erwünscht, dass das Ganze aus PTC-Widerständen und umhüllenden Metallkörpern von einer doppelten Isolierung umgeben wird, weil das Ganze mit Netzspannung betrieben wird. Infolge eines Fehlers, beispielsweise in der Zusammensetzung der Umhüllung oder der Aushärtung, kann bei Betrieb des Elementes die Umhüllung reissen und in diesem Fall ist es von grosser Bedeutung, dass eine zweite Umhüllung aus elastischerem Material vermeidet, dass der Benutzer des Elementes die spannungsführenden Metallteile berühren könnte.For security reasons, it is now desirable that the whole of PTC resistors and enveloping metal bodies is surrounded by double insulation, because the whole is operated with mains voltage. As a result of an error, for example in the composition of the covering or the hardening, the element can be in operation tear the cover and in this case it is of great importance that a second cover made of a more elastic material prevents the user of the element from touching the live metal parts.

Das Pressen der ineinander passenden Teile der Umhüllung, von denen der eine Teil in den anderen geschoben wird oder das Umpressen eines gepressten Teiles mit einem zweiten Material sind praktisch schwierig durchzuführende Verfahren, die sich nicht automatisieren lassen.Pressing the mating parts of the casing, one part of which is pushed into the other, or pressing a pressed part with a second material, are processes which are practically difficult to carry out and which cannot be automated.

Eine weitere Möglichkeit ist es, das Ganze aus PTC-Widerständen mit den umhüllenden Metallteilen in eine isolierende Kunststoffolie, beispielsweise aus Polyimid, einzuwickeln, bevor dieses Ganze in die gepresste Umhüllung eingeschoben wird. Auch dieses Verfahren ist aufwendig.Another possibility is to wrap the whole thing from PTC resistors with the enveloping metal parts in an insulating plastic film, for example made of polyimide, before this whole thing is pushed into the pressed casing. This process is also complex.

Die Erfindung verschafft ein Verfahren zum Herstellen eines selbstregelnden Heizelementes, das als Wärmequelle mindestens einen Widerstandskörper aus einem Material mit einem positiven Temperaturkoeffizienten des elektrischen Widerstandes aufweist, wobei der Widerstandskörper bzw. die Widerstandskörper zwischen Metallteilen angeordnet ist bzw. sind, die auf der von dem Widerstandskörper bzw. den Widerstandskörpern abgewandten Seite an der Innenwand einer an einem Ende geschlossenen zylinderförmigen Umhüllung, die aus vulkanisiertem thermoplastischem Material besteht, in wärmeaustauschendem Kontakt angeordnet sind, dadurch gekennzeichnet, dass die Umhüllung im Pressverfahren hergestellt ist und dass die Umhüllung auf ihrer Innenwand eine Schicht aus einem Elastomer aufweist, wobei das Elastomer dadurch angebracht wird, dass die gepresste Umhüllung mit einer Lösung des Elastomers gefüllt, diese Umhüllung entleert und daraufhin erhitzt wird, damit das Lösungsmittel entfernt und das Elastomer durchpolymerisiert wird.The invention provides a method for producing a self-regulating heating element which, as a heat source, has at least one resistance body made of a material with a positive temperature coefficient of electrical resistance, the resistance body or the resistance bodies being arranged between metal parts on which the resistance body is located or the side facing away from the resistance bodies on the inner wall of a cylindrical cover, which is closed at one end and which consists of vulcanized thermoplastic material, are arranged in heat-exchanging contact, characterized in that the cover is produced by the pressing process and that the cover has a layer on its inner wall an elastomer, the elastomer being attached by filling the pressed envelope with a solution of the elastomer, emptying the envelope and then heating it to remove the solvent t and the elastomer is polymerized.

Die Erfindung verschafft weiter ein Verfahren zum Herstellen eines selbstregelnden Heizelementes, das als Wärmequelle mindestens einen Widerstandskörper aus einem Material mit einem positiven Temperaturkoeffizienten des elektrischen Widerstandes aufweist, wobei der Widerstandskörper bzw. die Widerstandskörper zwischen Metallteilen angeordnet ist bzw. sind, die auf der von dem Widerstandskörper bzw. den Widerstandskörpern abgewandten Seite an der Innenwand einer an einem Ende geschlossenen zylinderförmigen Umhüllung, die aus vulkanisiertem thermoplastischem Material besteht, in wärmeaustauschendem Kontakt angeordnet sind, dadurch gekennzeichnet, dass die Umhüllung im Pressverfahren hergestellt ist und dass die Umhüllung auf ihrer Innenwand eine Schicht aus einem Elastomer aufweist, wobei das Elastomer dadurch angebracht wird, dass die gepresste Umhüllung in eine Lösung des Elastomers eingetaucht und die Umhüllung daraus entfernt wird und dass man die überflüssige Lösung abtropfen lässt, wonach die Umhüllung erhitzt wird, damit das Lösungsmittel entfernt und das Elastomer durchpolymerisiert wird.The invention further provides a method for producing a self-regulating heating element which, as a heat source, has at least one resistance body made of a material with a positive temperature coefficient of electrical resistance, the resistance body or the resistance bodies being arranged between metal parts on which the Resistance bodies or the side facing away from the resistance bodies are arranged in heat-exchanging contact on the inner wall of a cylindrical covering which is closed at one end and which consists of vulcanized thermoplastic material, characterized in that the covering is produced by the pressing process and that the covering has a layer on its inner wall comprises an elastomer, the elastomer being attached by immersing the pressed covering in a solution of the elastomer and removing the covering therefrom and by making the superfluous solution drains, after which the casing is heated so that the solvent is removed and the elastomer is polymerized.

Das erfindungsgemässe Verfahren weist das Kennzeichen auf, dass auf der Oberfläche einer im Pressverfahren hergestellten Umhüllung auf der Innen- und/oder Aussenseite eine Schicht aus einem Elastomer mittels einer Lösung angebracht wird.The method according to the invention is characterized in that a layer of an elastomer is applied by means of a solution on the inside and / or outside of a covering produced by the pressing method.

Das Elastomer wird mittels einer Lösung in Form einer Schicht angebracht. Das Elastomer hat vorzugsweise eine Viskosität, die höher ist als die des gepressten Teils und schwankt von 200 mPa/s bis 1.000.000 mPa/s. Dies bedeutet, dass die Schicht eine höhere Elastizität hat als der gepresste Teil.The elastomer is applied by means of a solution in the form of a layer. The elastomer preferably has a viscosity that is higher than that of the pressed part and varies from 200 mPa / s to 1,000,000 mPa / s. This means that the layer has a higher elasticity than the pressed part.

Das Elastomer kann vom Typ eines additionspolymerisierten Silikonenharzes mit zwei Komponenten sein oder vom Typ eines Kondensationspolymerisierten Elastomers. Beim Anbringen der Schicht wird von einer Lösung in einem einfachen Lösungsmittel oder einem Gemisch von Lösungsmitteln ausgegangen, das man nach dem Anbringen verdampfen lässt. Der Lösung des Elastomers können ebenfalls Füllstoffe wie Metalloxide, die eine höhere thermische Leitfähigkeit aufweisen, Farbstoffe oder Stabilisatoren zugefügt werden.The elastomer may be of a two-component addition polymerized silicone resin type or a condensation polymerized elastomer type. When applying the layer, a solution in a simple solvent or a mixture of solvents is assumed, which is allowed to evaporate after the application. Fillers such as metal oxides, which have a higher thermal conductivity, dyes or stabilizers can also be added to the solution of the elastomer.

Wenn eine Schicht auf der Aussenseite des gepressten Teils angebracht werden muss, kann dies im Tauchverfahren erfolgen. Ein innere Schicht erhält man dadurch, dass der gepresste Teil mit dem betreffenden Material gefüllt und danach wieder entleert wird, wobei sich an den Wänden eine Schicht bildet. Es empfiehlt sich meistens während des Kontaktes mit der Lösung diese ins Schwingen zu bringen, damit eine Schicht mit einer konstanten Dicke erhalten wird. Nach dem Anbringen wird getrocknet und erhitzt, damit weiter duchpolymerisiert wird.If a layer is pressed on the outside Partly must be attached, this can be done in the immersion process. An inner layer is obtained by filling the pressed part with the relevant material and then emptying it again, a layer forming on the walls. It is usually advisable to vibrate the solution during contact so that a layer with a constant thickness is obtained. After the attachment, it is dried and heated so that it is polymerized further.

Das erfindungsgemässe Verfahren bietet viele Vorteile; der Transport der gepressten Umhüllung zu einer Füllvorrichtung oder zu einer Tauchvorrichtung lässt sich leicht automatisieren. Weiterhin kann der Durchmesser des Elementes bis unter 8 mm verringert werden und gelangt dadurch in eine praktisch interessante Reihe von Abmessungen. Ausserdem, wenn durch einen Fehler der gepresste Teil der Umhüllung reisst, bleibt die elastischere mittels einer Flüssigkeit angebrachten zweite Umhüllung wirksam und löst sich örtlich bei dem Riss von dem gepressten Teil, so dass keine stromführenden Metallteile frei werden.The method according to the invention offers many advantages; the transport of the pressed casing to a filling device or to a dipping device can be easily automated. Furthermore, the diameter of the element can be reduced to less than 8 mm, which gives it a practically interesting range of dimensions. In addition, if the pressed part of the casing breaks due to a defect, the more elastic second casing attached by means of a liquid remains effective and loosens locally from the pressed part during the crack, so that no current-carrying metal parts are released.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen

  • Fig. 1 einen Längsschnitt durch ein erfindungsgemäss hergestelltes Heizelement,
  • Fig. 2 einen Schnitt gemäss der Linie II-II durch das Element nach Fig. 1,
  • Fig. 3 einen Längsschnitt durch eine andere Ausführungsform eines erfindungsgemäss hergestellten Heizelementes.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it
  • 1 shows a longitudinal section through a heating element produced according to the invention,
  • 2 shows a section along the line II-II through the element of FIG. 1,
  • 3 shows a longitudinal section through another embodiment of a heating element produced according to the invention.

In den Fig. 1 und 2 sind 1 und 2 Widerstandskörper mit eine positiven Temperaturgradienten des Widerstandes. Diese Widerstandskörper sind zwischen zwei halbzylinderförmigen Metallkörpern 3 und 4, die beispielsweise aus Aluminium bestehen, eingeklemmt. Die Umhüllung 6, die beispielsweise aus einem vulkanisierten Silikonkautschuk gepresst ist, der mit Magnesiumoxid und Siliciumdioxid gefüllt ist, ist auf der Innenseite zwischen der gepressten Umhüllung 6 und den Metallkörpern 3, 4 mit einer Schicht 5 aus einem Siliconelastomer, das bei Raumtemperatur eine Viskosität von 10⁶ mPa/s aufweist, bedeckt.1 and 2 are 1 and 2 resistance bodies with a positive temperature gradient of the resistance. These resistance bodies are clamped between two semi-cylindrical metal bodies 3 and 4, which consist for example of aluminum. The casing 6, which is pressed, for example, from a vulcanized silicone rubber, that with magnesium oxide and silicon dioxide is filled, is covered on the inside between the pressed casing 6 and the metal bodies 3, 4 with a layer 5 of a silicone elastomer, which has a viscosity of 10⁶ mPa / s at room temperature.

Fig. 3 zeigt ein der Fig. 1 entsprechendes Heizelement, bei dem jedoch die Schicht 5 auf der Innenseite des gepressten Teils durch eine ähnliche Schicht 9 auf der Aussenseite desselben ersetzt worden ist.Fig. 3 shows a heating element corresponding to Fig. 1, but in which the layer 5 on the inside of the pressed part has been replaced by a similar layer 9 on the outside thereof.

Claims (3)

  1. A method of manufacturing a self-regulating heating element which comprises as a heat source at least one resistor body (1,2) of a material having a positive temperature coefficient of resistance, said resistor body or resistor bodies being arranged between metal parts (3,4) which, on the side facing away from the resistor body or resistor bodies, are arranged so as to be in heat-exchanging contact with the inside wall of a cylindrical casing (6) of vulcanised thermoplastic material which is closed at one end, characterized in that the casing is manufactured by moulding and that the inside wall of the casing is coated with an elastomer layer (5) which is provided by filling the moulded casing with a solution of the elastomer, after which the casing is evacuated and then heated to remove the solvent and completely polymerize the elastomer.
  2. A method of manufacturing a self-regulating heating element which comprises as a heat source at least one resistor body (1,2) of material having a positive temperature coefficient of electrical resistance, said resistor body or resistor bodies being arranged between metal parts (3,4) which, on the side facing away from the resistor body or resistor bodies, are arranged so as to be in heat-exchanging contact with the inner wall of a cylindrical casing (6) of vulcanised thermoplastic material which is closed at one end characterized in that the casing is manufactured by moulding and that the inside wall of the casing is coated with an elastomer layer (9) which is provided by immersing the moulded casing in a solution of the elastomer, after which the casing is removed from said solution and the excess solution is drained off, whereupon the casing is heated to remove the solvent and completely polymerize the elastomer.
  3. A method of manufacturing a heating element as claimed in claim 1 or 2, characterized in that the elastomer has a higher viscosity and greater elasticity than the material used for the moulded casing (6).
EP87200052A 1986-01-23 1987-01-16 Manufacturing method of a self-regulating heating element Expired - Lifetime EP0234608B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8600142 1986-01-23
NL8600142A NL8600142A (en) 1986-01-23 1986-01-23 METHOD FOR MANUFACTURING A SELF-REGULATING HEATING ELEMENT

Publications (2)

Publication Number Publication Date
EP0234608A1 EP0234608A1 (en) 1987-09-02
EP0234608B1 true EP0234608B1 (en) 1992-09-02

Family

ID=19847454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87200052A Expired - Lifetime EP0234608B1 (en) 1986-01-23 1987-01-16 Manufacturing method of a self-regulating heating element

Country Status (8)

Country Link
US (1) US4835370A (en)
EP (1) EP0234608B1 (en)
JP (1) JPS62172683A (en)
KR (1) KR870007641A (en)
CA (1) CA1281532C (en)
DE (1) DE3781426D1 (en)
DK (1) DK28887A (en)
NL (1) NL8600142A (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687064A (en) * 1986-03-24 1987-08-18 Rjm, Inc. Green peanut harvester
US5414241A (en) * 1992-05-11 1995-05-09 Sekisui Kaseihin Kogyo Kabushiki Kaisha Heater, a method of manufacturing the same, and an anti-condensation mirror incorporating the same
DE9309071U1 (en) * 1993-06-17 1993-08-19 Fritz Eichenauer Gmbh & Co Kg, 76870 Kandel Electrical resistance heating element
JPH0773958A (en) * 1993-09-03 1995-03-17 Texas Instr Japan Ltd Heating device
US5586214A (en) * 1994-12-29 1996-12-17 Energy Convertors, Inc. Immersion heating element with electric resistance heating material and polymeric layer disposed thereon
EP1467599B1 (en) * 2003-04-12 2008-11-26 Eichenauer Heizelemente GmbH & Co.KG Device for the admission of ceramic heating elements and procedure for the production of such
DE10316908A1 (en) * 2003-04-12 2004-10-21 Eichenauer Heizelemente Gmbh & Co. Kg heater
KR100609452B1 (en) * 2005-05-20 2006-08-03 모딘코리아 유한회사 Ptc rod assembly and pre-heater including the same
US20100200569A1 (en) * 2009-02-12 2010-08-12 Tom Richards, Inc. Controlled force ptc heater
CN101945505A (en) * 2010-08-31 2011-01-12 上海吉龙经济发展有限公司 Dual-waterway seal positive temperature coefficient (PTC) heater
US20120217233A1 (en) * 2011-02-28 2012-08-30 Tom Richards, Inc. Ptc controlled environment heater
US20120248092A1 (en) * 2011-03-30 2012-10-04 Palo Alto Research Center Incorporated Low temperature thermistor process
DE102012107600B4 (en) * 2012-08-20 2015-10-08 Borgwarner Ludwigsburg Gmbh Electric heating device for heating fluids
EP3101999B1 (en) * 2015-06-02 2021-03-17 Eberspächer catem GmbH & Co. KG Ptc heating element and electric heater for a motor vehicle comprising such a ptc heating element
KR102476376B1 (en) * 2017-08-31 2022-12-12 현대자동차주식회사 Cooling water heating apparatus of electric vehicle
DE102018101453A1 (en) * 2018-01-23 2019-07-25 Borgwarner Ludwigsburg Gmbh Heating device and method for producing a heating rod
CN209689202U (en) * 2019-03-25 2019-11-26 上海荣威塑胶工业有限公司 PTC liquid heating

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641894B2 (en) * 1975-09-23 1978-05-18 N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande)
DE2614433C3 (en) * 1975-04-07 1981-10-01 Naamloze Vennootschap Philips' Gloeilampenfabrieken, Eindhoven Self-regulating heating element

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233028A (en) * 1960-04-27 1966-02-01 Erie Technological Prod Inc Method of making a capacitor
FR1480060A (en) * 1966-05-18 1967-05-05 Elpag Ag Chur Method to prevent stress line corrosion for chrome-nickel stainless steel objects
DE1765622C3 (en) * 1968-06-20 1980-07-17 Tuerk & Hillinger Gmbh & Co, 7200 Tuttlingen Electric heating cable and process for its manufacture
FR2292395A1 (en) * 1974-11-20 1976-06-18 Matsushita Electric Ind Co Ltd THERMOSTATIC SEALED HEAT GENERATOR
US4086467A (en) * 1976-07-19 1978-04-25 Texas Instruments Incorporated Electronic heater for high voltage applications
JPS5315640A (en) * 1976-07-28 1978-02-13 Hitachi Heating Appliance Co Ltd Heating unit
US4200973A (en) * 1978-08-10 1980-05-06 Samuel Moore And Company Method of making self-temperature regulating electrical heating cable
DE2948592C2 (en) * 1979-12-03 1990-05-10 Fritz Eichenauer GmbH & Co KG, 6744 Kandel Electric resistance heating element
US4330929A (en) * 1979-12-06 1982-05-25 Siemens Corporation Process for making an electrical component having a metallic casing with a conformable plastic coating
AT376100B (en) * 1980-03-27 1984-10-10 Menhardt Walther Dr SELF-REGULATING HEATING ELEMENT
GB2091070B (en) * 1980-12-13 1984-10-10 Fudickar Kg C S An electrical heating device
AT384142B (en) * 1981-01-26 1987-10-12 Walther Dr Menhardt SELF-REGULATING HEATING ELEMENT

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2614433C3 (en) * 1975-04-07 1981-10-01 Naamloze Vennootschap Philips' Gloeilampenfabrieken, Eindhoven Self-regulating heating element
DE2641894B2 (en) * 1975-09-23 1978-05-18 N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande)

Also Published As

Publication number Publication date
DK28887D0 (en) 1987-01-20
DK28887A (en) 1987-07-24
JPS62172683A (en) 1987-07-29
KR870007641A (en) 1987-08-20
US4835370A (en) 1989-05-30
EP0234608A1 (en) 1987-09-02
NL8600142A (en) 1987-08-17
DE3781426D1 (en) 1992-10-08
CA1281532C (en) 1991-03-19

Similar Documents

Publication Publication Date Title
EP0234608B1 (en) Manufacturing method of a self-regulating heating element
DE1546792C3 (en) Method of making a deformable roll
US2659795A (en) Sheathed resistor electric heater
DE1479648A1 (en) Thermally resilient molded parts, in particular covers
DE3507509A1 (en) HIGH VOLTAGE-RESISTANT COMPONENT AND METHOD FOR THE PRODUCTION THEREOF
DE2009015A1 (en) Induktor
DE2604847A1 (en) METHOD AND DEVICE FOR MANUFACTURING A PLASTIC PART WITH A RESISTOR ELEMENT
DE2105572A1 (en) Electrical resistance heating cable
EP0913882B1 (en) Method for insulating an electrical device
DE7913329U1 (en) COVERED HEATING RESISTOR, ESPECIALLY FOR WASHING MACHINES, DISHWASHING MACHINES, OTHER WITH A HEATING CONDUCTOR AND A METAL SHEATHING AND A THERMAL AND ELECTRICALLY INSULATING SPACER BETWEEN THE HEATING CONDUCTOR AND SHEATHING
DE7913357U1 (en) DEVICE FOR FASTENING AND LEAK-PROOF FASTENING OF COVERED ELECTRICAL RESISTORS
DE2844830A1 (en) Plastic two=piece shell for capacitors - with thermosetting wafer inserted between capacitor body and lower shell-wall
DE1565337B1 (en) Tubular heater and process for its manufacture
EP1555514B1 (en) Sensor, method for manufacturing the same and an electrical apparatus comprising such a sensor
DE2410451A1 (en) Damp-proof seal for tubular, electric, heating elements - has a tubular plastic stopper and a dielectric barrier liq.
DE7916786U1 (en) ELECTRICALLY HEATED HOT WATER CURRENT HEATER
DE890201C (en) Hose made of swellable substances for binding isolated electrical lines
DE1438053C3 (en) Low-voltage high-performance fuse with a plastic sleeve surrounding the fusible conductor and the embedding material as a fuse housing and a method for producing these fuses
DE968124C (en) Process for the installation of electrical components, e.g. Capacitors, in a metal housing
DE749229C (en) Method for producing an oil lock in oil-impregnated electrical cables
DE840422C (en) Electrically heated devices
DE3720927C1 (en) Electrically heated continuous-flow heater for washing machines or dishwashers
DE3204761C2 (en) Coaxial high frequency cable
CH299052A (en) Insulated electrical conductor structure and process for its manufacture.
DE1941356U (en) ELEMENT OR CABLE WITH METAL SHEATH AND MINERAL INSULATION.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19880301

17Q First examination report despatched

Effective date: 19891221

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE FR GB IT LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19920902

Ref country code: BE

Effective date: 19920902

REF Corresponds to:

Ref document number: 3781426

Country of ref document: DE

Date of ref document: 19921008

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19930131

Ref country code: LI

Effective date: 19930131

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950327

Year of fee payment: 9

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19951222

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19960130

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19961001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970116

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970116

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19970930

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST