EP0057252A2 - Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication - Google Patents

Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication Download PDF

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Publication number
EP0057252A2
EP0057252A2 EP81107789A EP81107789A EP0057252A2 EP 0057252 A2 EP0057252 A2 EP 0057252A2 EP 81107789 A EP81107789 A EP 81107789A EP 81107789 A EP81107789 A EP 81107789A EP 0057252 A2 EP0057252 A2 EP 0057252A2
Authority
EP
European Patent Office
Prior art keywords
heating coil
thermal insulation
coating
binder
mineral
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.)
Ceased
Application number
EP81107789A
Other languages
German (de)
English (en)
Other versions
EP0057252A3 (fr
Inventor
Hans Kummermehr
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.)
Gruenzweig und Hartmann und Glasfaser AG
Original Assignee
Gruenzweig und Hartmann und Glasfaser AG
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 Gruenzweig und Hartmann und Glasfaser AG filed Critical Gruenzweig und Hartmann und Glasfaser AG
Publication of EP0057252A2 publication Critical patent/EP0057252A2/fr
Publication of EP0057252A3 publication Critical patent/EP0057252A3/fr
Ceased legal-status Critical Current

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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
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the invention relates to a device for the heat-insulating mounting of an electric heating coil, in particular for a radiation-heated hotplate, according to the preamble of claim 1, and to a heat-insulating plate which is particularly suitable for use with the device and a method which is particularly suitable for its production.
  • the bearing layer like the insulation layer, consists of a microporous, particulate insulating material produced as a base material in flame pyrolysis, but, in contrast to the corresponding material of the insulation layer, is hardened with an inorganic binder.
  • This hardened bearing layer has approximately the same thickness as the lower insulation layer.
  • the thermal insulation board thus formed from the lower insulation layer and the upper bearing layer must be exposed to temperatures of 700 ° C. or more in a hardening furnace, which is energy-consuming and time-consuming.
  • the hardened bearing layer is in any case only arranged on the top of the insulating layer, so that the lateral and lower areas of the insulating layer are exposed and exposed to damage during handling, storage or transport of the thermal insulation boards, especially before they are installed, in view of the low strength of the insulating material are.
  • the invention has for its object a device of the type outlined in the preamble of claim 1 or a thermal insulation panel for formation to create the thermal insulation material for this, which also ensures a structurally simple and reliable position securing of the heating coil and has the best possible thermal insulation properties with a low overall height, but can be produced with less effort.
  • the coating can simply be applied in a spraying, brushing or dipping process and adheres to the insulation layer after drying, this adhesion being able to be supported if necessary by adding a small amount of an organic binder.
  • the heating coil can be attached to the dried coating with an inorganic adhesive, the inorganic adhesive having the same composition as the mixture forming the coating. In operation of the heating coil temperatures are generated by more than 1 000 C in the immediate vicinity of the heating coil, so that in these areas, the present after the drying adhesive bond or adhesive type bond by means of an organic binder in ceramic bonding passes, while the organic binder burns substantially without residue.
  • the simple way of applying the coating for example in a dipping process, and its relatively small required thickness of less than 1 mm also make it possible not only to coat the storage area of the heating coil, but also the entire thermal insulation panel with the coating, so that this can be done without any additional effort is protected on all sides and can be prefabricated, stored and transported to another manufacturing facility in this form without the risk of damage, at which point the heating coil, the installation in the receptacle and, if necessary, the final assembly of the hotplate or the like.
  • Claim 20 specifies a method which is particularly suitable for prefabricating the insulation board and which is advantageously further developed according to Claim 21.
  • the illustrated device consists essentially of a receptacle 1 made of metal, in particular aluminum sheet, and thermal insulation material in the form of a thermal insulation panel 2, which is arranged on the inside of a peripheral wall 3 of the receptacle 1 between the bottom 4 and a heating coil 5.
  • the electrically operated heating coil 5 has electrical connections, not shown, which are led out of the area of the receiving shell 1 in a suitable manner.
  • the device shown is used for radiant heating of a glass-ceramic cover of a hotplate, the glass-ceramic plate (not shown in detail) resting on a support surface 22 and thus receiving a distance from the upper edge of the peripheral wall 3 of the receiving shell 1 and from the heating coil 5.
  • the peripheral wall 3 of the receiving shell 1 and thus the entire device has an essentially circular shape in plan view and is concentric with a central axis 14.
  • the thermal insulation panel 2 consists essentially of an insulating layer 9 provided with a coating 7, which receives the heating coil 5 in helical grooves 8, which are also lined with the coating 7.
  • the coating 7 is applied, for example, by a dipping process and covers the material of the insulating layer 9 on all sides.
  • the insulation layer 9 lies over the coating 7 on the bottom 4 of the receiving shell 1 and consists of fine-pored silica airgel.
  • This material is known per se and, in addition to the silica airgel, generally has a mineral fiber reinforcement and / or an opacifying agent;
  • a mineral fiber reinforcement and / or an opacifying agent Such highly effective thermal insulation materials are sold by the applicant under the name MINILEIT (registered trademark), with regard to individual is referred to the relevant DE-OSen 27 47 663, 27 48 307 and 27 54 956, to which reference is expressly made.
  • a material for the insulating layer 9 is preferably used, which consists of 30 to 50% by weight of pyrogenic silica, 20 to 50% by weight of opacifying agent and 5 to 15% by weight of aluminum fibers, and in a density of 200 to 400 kg / m 3 is present, but does not need to be organic or inorganic hardened.
  • Such a special thermal insulation material has a thermal conductivity that is lower than that of still air and is also only slightly temperature-dependent.
  • the molded plates made of such a material are mechanically not very resistant.
  • the material can also have aluminum oxide airgel, or a suitable mixture of both aerogels, in order to achieve higher temperature resistance if required.
  • the insulating material of the insulating layer can contain 9 additions of high-temperature resistant materials such as manganese oxide, zirconium oxide or titanium oxide. For special purposes it is also possible to work with their aerogels.
  • the heating coil 5 is fastened to the coating 7 in the helical grooves 8 by means of an adhesive 6.
  • the adhesive 6, which cannot be seen from the drawing, is applied to discrete locations along the extent of the heating coil 5 and thus secures its position at locations spaced apart from one another.
  • the heating coil 5 is in the illustrated manner by means of the additional adhesive bers 6, the consistency of which may otherwise correspond to that of the coating 7, subsequently glued to the dried coating.
  • Suitable high-temperature-resistant inorganic adhesives 6 with a temperature resistance of up to 1150 ° C., that is to say completely sufficient, are available.
  • a ceramic adhesive can also be used here, which is given an initial strength by an organic binder component and solidifies at elevated temperatures between about 500 and 1000 ° C. by means of a ceramic bond, as explained in more detail below in connection with the mixture for the coating 7 is. Due to the high temperature that is reached during operation of the heating coil 5, the transition into the ceramic bond is made, which provides the position of the heating coil 5 with sufficient strength by far.
  • the coating 7 is provided in a layer thickness between approximately 0.05 and 0.5 mm, preferably between 0.2 and 0.3 mm and may have a thickness of 0.25 mm in the present example.
  • the coating 7 consists of a mixture of materials which contains mineral fibers and a ceramic binder, which solidifies at temperatures between about 500 ° C and 1000 ° C by ceramic bonding.
  • the proportion of mineral fibers should be as high as possible, since the mineral fibers counteract a tendency of the coating 7 to shrink at elevated temperatures.
  • the mineral fibers should therefore be present in a proportion of more than 50% by weight of the dry mixture, but preferably in an even higher proportion of 75 to 95% by weight, a proportion of approximately 80% by weight being selected in the example may be.
  • the mineral fibers have a softening or melting point of over 1000 ° C, preferably of over 1100 ° C, so are compared to the in Operating temperatures resistant.
  • Such adjustment of the softening or melting point of the fibers is achieved, on the one hand, by choosing a certain particle size, larger particles softening and sintering later than smaller, powder-like particles, and by choosing the additives or fluxes in addition to the main aluminum oxide and silicon oxide component of the mineral fibers .
  • the mineral fibers are drawn from the melt with a thickness of between approximately 0.5 and 3 ⁇ m, preferably between 1 and 2 ⁇ m and then ground, so that they are broken to lengths between approximately 2 and 20 ⁇ m, preferably between approximately 5 and 10 ⁇ m , but in any case the length of the mineral fibers exceeds their thickness by at least twice, so that there is actually still a fiber character.
  • the additives such as flux in the melt for the production of the fibers, such as Na 2 0, B 2 0 3 , M g O, Fe 2 0 3 and other additives known per se can then be chosen so that the results in the desired temperature resistance up to areas above 1000 or above 1100 ° C, i.e. in areas in which the mineral fibers based on aluminum silicate do not soften or melt at the maximum temperature occurring during operation.
  • the ceramic binder can also consist of aluminum silicate particles or fiber elements, which, however, in contrast to the mineral fibers, soften and sinter at temperatures between 500 and 1000 ° C and thus result in the ceramic bond.
  • This is a significant difference between the ceramic binder used and other inorganic binders such as water glass, which is known from DE-OS 27 47 663 as a binder for a similar coating of a molded body made of thermal insulation material. Even at room temperature, water glass has a sufficient adhesive effect, that of higher ones Temperatures basically remain unchanged. However, it has been shown that a coating with water glass as a binder shrinks too much at elevated temperatures, and in particular leakage currents occur due to the addition of water glass when the heating coil 5 is energized.
  • the proportion of binder is therefore between about 5 and 50% by weight, preferably between 10 and 20% by weight, of the dry mixture, in the example case around 15% by weight, with one being smaller than the mineral fibers, preferably one in terms of particle volume Power of ten or order of magnitude smaller particle size of the mineral particles of the ceramic binder is selected; even the smaller particle size results in a softening or melting point at lower temperatures, the setting being able to be made in detail by appropriate choice of the flux to produce correspondingly low-melting mineral particles.
  • mineral pigments are also contained in the coating 7, specifically in the form of Ti0 2 or Ti0 2 -containing substances.
  • the mineral pigments which are not absolutely necessary, serve to scatter or reflect part of the IR radiation and to increase the abrasion resistance.
  • Ti0 2 -containing material may, for example, a mixture of A1 2 0 3 and Ti0 2 are chosen, wherein the. Ti0 2 is used as a pigment in addition to its function as clouding agents in relation to the IR radiation.
  • suitable pigments are, for example, rutile, ilmenite, iron oxide, chromium oxide and the like.
  • the mineral pigments are present in the coating 7 in a proportion of up to a maximum of about 20% by weight of the dry mixture, but preferably in a proportion less than 10% by weight.
  • the coating 7 may consist of approximately 80% by weight of mineral fibers, 15% by weight of ceramic binder in the form of low-melting mineral particles and 5% of mineral pigments in the form of TiO 2 .
  • the fine-powdered thermal insulation material based on fine-pored silica airgel is first introduced into a press room, where it is pressed and compressed to form the shaped body of the contour shown in FIG. 1.
  • a slurry is produced from water and a mixture of substances which contains the proportions of high-temperature-resistant mineral fibers, low-melting mineral particles as ceramic binders and optionally mineral pigments, which have already been explained above.
  • the water content of the slurry is chosen essentially in accordance with the type of application of the coating 7 and is between approximately 40% by weight for producing a pasty consistency for spreading and approximately 70% by weight for application by immersion.
  • the wet-coated molded body is dried at an elevated temperature of about 100 to 150 ° in a drying oven.
  • an organic binder can be added to the mixture of substances forming the coating. which burns at temperatures above 200 ° C, but in any case above 500 ° C, without leaving any annoying residues.
  • organic binders are available in large numbers, with carbon initially being released in the course of the combustion, which is then removed with oxygen as CO 2 . Since this combustion process usually releases foul-smelling substances and, in addition, any unavoidable residues should be kept as low as possible, the content of organic binder should only be chosen as high as is absolutely necessary to generate the desired organic binding forces.
  • the content of organic binders will always be less than 5% by weight, mostly also less than 1% by weight, of the dry mixture, while below a content of about 0.1% by weight of the dry mixture, there is no noticeable increase in the binding forces.
  • a preferred value for the proportion of the organic binder is therefore about 0.5% by weight of the dry mixture.
  • the thermal insulation board 2 After drying, the thermal insulation board 2 is prefabricated and can be handled and traded independently, the coating 7, optionally supported by the increase in strength by means of the organic binder, serving as a mechanical protective layer of the thermal insulation board 2 during handling, storage and transport. Subsequently, the prefabricated thermal insulation panel is inserted into the receiving shell 1, if necessary after transport to another manufacturing company, and the heating coil 5 is glued into the grooves 8 by means of the adhesive 6. If the heating coil 5 is then energized, the temperature of the coating 7 increases, at least in the vicinity of the heating coil 5 or in the area of the upper storage trough, designated 10, which is used to burn an optionally added organic binder and finally softens the melting mineral particles of the ceramic binder and thus leads to solidification through ceramic bonding.
  • the coating 7 optionally supported by the increase in strength by means of the organic binder, serving as a mechanical protective layer of the thermal insulation board 2 during handling, storage and transport.
  • the prefabricated thermal insulation panel is inserted into the receiving shell 1, if necessary after transport
  • Such a sharp increase in temperature does not occur precisely in view of the highly effective thermal insulation material of the insulating layer 9 in the area of the bottom 4 of the receiving shell 1, so that there is no solidification of the coating 7, if provided there at all, by ceramic bonding, but this is in these Areas also not necessary, since there are also no mechanical effects or stresses with regard to the coverage by the receiving shell 1.
  • the adhesive 6, which also consists of a ceramic binder, optionally with organic binder additives and, if appropriate, can have exactly the same consistency as the coating 7, also merges into the ceramic bond accordingly, so that the heating coil 5 despite the considerable thermal dimensional changes in view of the strong temperature fluctuations is stored safely.
  • inorganic binder can also be used for the adhesive 6, for example based on water glass, since problems due to shrinkage, leakage currents etc. are not to be feared to any considerable extent in view of the only local application of the adhesive 6.
  • water glass is not sufficiently temperature-resistant for many applications, so that a ceramic adhesive 6 also gives additional advantages in this regard.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Cookers (AREA)
EP81107789A 1981-01-29 1981-09-30 Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication Ceased EP0057252A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813102935 DE3102935A1 (de) 1981-01-29 1981-01-29 Vorrichtung zur waermedaemmenden lagerung einer elektrischen heizwendel, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie waermedaemmplatte hierzu und verfahren zu ihrer herstellung
DE3102935 1981-01-29

Publications (2)

Publication Number Publication Date
EP0057252A2 true EP0057252A2 (fr) 1982-08-11
EP0057252A3 EP0057252A3 (fr) 1982-08-25

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EP81107789A Ceased EP0057252A3 (fr) 1981-01-29 1981-09-30 Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication

Country Status (2)

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EP (1) EP0057252A3 (fr)
DE (1) DE3102935A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079076A1 (fr) * 1981-11-10 1983-05-18 Wacker-Chemie GmbH Plaque chauffante
EP0093273A3 (en) * 1982-05-03 1984-03-14 Elpag Ag Chur Radiation unit for a range or the like
EP0189108A1 (fr) * 1985-01-25 1986-07-30 Ceramaspeed Limited Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication
EP0105968B1 (fr) * 1982-10-20 1987-03-18 Elpag Ag Chur Dispositif de chauffage électrique pour des fourneaux ou des plaques de cuisson
US4864105A (en) * 1986-10-25 1989-09-05 Ceramaspeed Limited Radiant heaters
EP0551830A1 (fr) * 1992-01-13 1993-07-21 Husky Injection Molding Systems Ltd. Elément de chauffage flexible pour un corps de canal chaud avec procédé de fabrication et procédé d'installation
EP0561208A3 (en) * 1992-03-14 1993-10-13 E.G.O. Elektro-Geraete Blanc U. Fischer Induction cooking plate
FR2690106A1 (fr) * 1992-04-16 1993-10-22 Saint Gobain Isover Feutre aiguilleté comportant une couche de revêtement et procédé pour sa fabrication.
WO1997010188A1 (fr) * 1995-09-11 1997-03-20 Hoechst Research & Technology Deutschland Gmbh & Co. Kg Materiau composite a base d'aerogel contenant des fibres
EP0866297A1 (fr) * 1997-03-18 1998-09-23 Paul V. Suey Elément à surface dure en fibres céramiques et procédé pour sa fabrication
GB2357232A (en) * 1999-09-29 2001-06-13 Ceramaspeed Ltd Further insulating dish/insulation interface in an electric heater
US6887563B2 (en) 1995-09-11 2005-05-03 Cabot Corporation Composite aerogel material that contains fibres
US20100243644A1 (en) * 2007-09-27 2010-09-30 Hidetoshi Terashima Insulated structure of induction heating coil
CN116981119A (zh) * 2023-07-28 2023-10-31 浙江创特新材科技有限公司 一种预制加热块、加热模块及高强度细钨丝拉丝设备

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3219392A1 (de) * 1982-05-24 1983-12-01 Gruenzweig Hartmann Glasfaser Waermedaemmplatte fuer die lagerung einer elektrischen heizwendel, sowie verfahren zu ihrer herstellung
DE3248661A1 (de) * 1982-12-30 1984-07-05 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Hitzebestaendig beschichtetes bauteil
DE3519350A1 (de) * 1985-05-30 1986-12-04 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlungs-heizeinheit
DE3602541A1 (de) * 1986-01-29 1987-07-30 Rommelsbacher & Co Elektrowaer Heizwendeltraeger, damit versehene kochplatte und verfahren zu seiner herstellung
DE19935403A1 (de) * 1999-07-30 2001-02-08 Dechema Wärmedämmschicht auf Basis eines organischen Precursors und wärmedämmenden Partikeln sowie Beschichtungswerkstoff für eine solche Verwendung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2165569C3 (de) * 1971-12-30 1986-05-28 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochgerät mit einer oberen Platte aus hochwärmebeständigem glasartigem bzw. keramischem Material
US4090881A (en) * 1976-06-30 1978-05-23 The Babcock & Wilcox Company High temperature refractory adhesive
DE2747663A1 (de) * 1977-10-24 1979-04-26 Gruenzweig Hartmann Glasfaser Durch pressen verdichteter formkoerper aus einem gemisch aus pyrogener kieselsaeure, einem truebungsmittel und mineralwolle
DE2748307C2 (de) * 1977-10-27 1982-06-09 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Wärmedämmplatte und Verfahren zu ihrer Herstellung
DE2754956A1 (de) * 1977-12-09 1979-06-13 Gruenzweig Hartmann Glasfaser Waermedaemmplatte
DE3020326C2 (de) * 1980-05-29 1985-12-19 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Strahlungsheizkörper mit einer elektrischen Heizwendel, insbesondere für eine Glaskeramik-Kochplatte

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079076A1 (fr) * 1981-11-10 1983-05-18 Wacker-Chemie GmbH Plaque chauffante
EP0093273A3 (en) * 1982-05-03 1984-03-14 Elpag Ag Chur Radiation unit for a range or the like
EP0105968B1 (fr) * 1982-10-20 1987-03-18 Elpag Ag Chur Dispositif de chauffage électrique pour des fourneaux ou des plaques de cuisson
EP0189108A1 (fr) * 1985-01-25 1986-07-30 Ceramaspeed Limited Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication
US4864105A (en) * 1986-10-25 1989-09-05 Ceramaspeed Limited Radiant heaters
EP0551830A1 (fr) * 1992-01-13 1993-07-21 Husky Injection Molding Systems Ltd. Elément de chauffage flexible pour un corps de canal chaud avec procédé de fabrication et procédé d'installation
US5430273A (en) * 1992-03-14 1995-07-04 E.G.O. Elektro-Gerate Blanc U. Fischer Induction cooker heating system
EP0561208A3 (en) * 1992-03-14 1993-10-13 E.G.O. Elektro-Geraete Blanc U. Fischer Induction cooking plate
FR2690106A1 (fr) * 1992-04-16 1993-10-22 Saint Gobain Isover Feutre aiguilleté comportant une couche de revêtement et procédé pour sa fabrication.
WO1997010188A1 (fr) * 1995-09-11 1997-03-20 Hoechst Research & Technology Deutschland Gmbh & Co. Kg Materiau composite a base d'aerogel contenant des fibres
CN1104393C (zh) * 1995-09-11 2003-04-02 卡伯特公司 含有纤维的气凝胶复合材料，其制法和应用以及得到的成型体
US6887563B2 (en) 1995-09-11 2005-05-03 Cabot Corporation Composite aerogel material that contains fibres
EP0866297A1 (fr) * 1997-03-18 1998-09-23 Paul V. Suey Elément à surface dure en fibres céramiques et procédé pour sa fabrication
GB2357232A (en) * 1999-09-29 2001-06-13 Ceramaspeed Ltd Further insulating dish/insulation interface in an electric heater
US20100243644A1 (en) * 2007-09-27 2010-09-30 Hidetoshi Terashima Insulated structure of induction heating coil
US10080261B2 (en) * 2007-09-27 2018-09-18 Nippon Steel & Sumitomo Metal Corporation Insulated structure of induction heating coil
CN116981119A (zh) * 2023-07-28 2023-10-31 浙江创特新材科技有限公司 一种预制加热块、加热模块及高强度细钨丝拉丝设备

Also Published As

Publication number Publication date
DE3102935A1 (de) 1982-09-02
EP0057252A3 (fr) 1982-08-25

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Effective date: 19841231

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Inventor name: KUMMERMEHR, HANS