EP1757168A1 - Element chauffant, son procede de fabrication, article dote d'un tel element et son procede de fabrication - Google Patents
Element chauffant, son procede de fabrication, article dote d'un tel element et son procede de fabricationInfo
- Publication number
- EP1757168A1 EP1757168A1 EP05775284A EP05775284A EP1757168A1 EP 1757168 A1 EP1757168 A1 EP 1757168A1 EP 05775284 A EP05775284 A EP 05775284A EP 05775284 A EP05775284 A EP 05775284A EP 1757168 A1 EP1757168 A1 EP 1757168A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resin
- dielectric
- layer
- heating element
- charges
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible
- H05B3/26—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
- H05B3/262—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base the insulating base being an insulated metal plate
Definitions
- Heating element its manufacturing process, article having such an element and its manufacturing method
- the present invention relates to a heating element intended to be deposited on a metal substrate, for example aluminum or aluminum alloy, and its method of manufacture.
- the invention also relates to an article provided with such a heating element and the method of manufacturing such an article.
- the use of the heating elements according to the invention can be envisaged for the manufacture of cooking utensils or cooking utensils, iron soles, cups of kettles, etc.
- the heating element of the present invention must be able to deliver high power, with a power / surface ratio of at least 1 W / cm 2 and up to values of the order of 40 W / cm 2 . If desired, this type of heating element must be able to distribute the heat uniformly over an entire surface and this, whether the power is high or low.
- Such heating elements consist of enamels which are obtained from an enamel frit subjected to a firing temperature of the order of 85O 0 C. Given this manufacturing constraint, they are deposited on a substrate metal capable of withstanding such temperatures, for example of the steel, stainless steel or alumina type. Such enamels are not against not suitable for a deposit on an aluminum substrate.
- the object of the present invention is therefore to overcome all the disadvantages mentioned above by providing a heating element intended to be deposited on a metal substrate, for example aluminum or aluminum alloy, or even stainless steel , capable of delivering high powers, in particular with a surface / power ratio of up to values of the order of 40 W / cm 2 while retaining good dielectric performance and / or capable of delivering a homogeneous heat on a whole surface.
- a heating element intended to be deposited on a metal substrate, for example aluminum or aluminum alloy, or even stainless steel , capable of delivering high powers, in particular with a surface / power ratio of up to values of the order of 40 W / cm 2 while retaining good dielectric performance and / or capable of delivering a homogeneous heat on a whole surface.
- the heating element must have a simple structure and have a very good homogeneity.
- the present invention thus relates to a heating element intended to be deposited on a metal substrate, preferably aluminum or aluminum alloy.
- this element comprises, from the substrate, at least one dielectric layer comprising a resin and dielectric fillers, at least one resistive layer comprising a resin and electrically conductive fillers, at least one conductive layer which is intended for electrical connection of said to least one resistive layer and which comprises a resin and electrically conductive fillers and at least one final protective layer comprising a resin and dielectric fillers, said dielectric, resistive, conductive and final protection layers comprising the same resin, said resin being a organic resin.
- the heating element according to the invention is therefore produced by the superposition of layers, each layer having a composition specifically adapted to the desired function for said layer.
- the choice of the resin is determined by the conditions of manufacture of the heating element and end use of the latter.
- an exclusively organic resin resistant to high temperatures for example at least 200-250 ° C., will be chosen in operating mode of the heating element.
- the resin present in the dielectric, resistive, conductive and final protection layers comprises at least one compound selected from a polyamide imide (PAI), a polyimide (PI), a polyether sulfone (PES), a polyether imide (PEI), a polyphenylene sulfone (PPS), a silicone and an epoxy resin.
- PAI polyamide imide
- PI polyimide
- PES polyether sulfone
- PPS polyphenylene sulfone
- silicone an epoxy resin
- this method comprises the following steps:
- each of said dielectric, resistive, conductive and final protection layers comprising the same resin, said resin being an organic resin.
- the use of a single organic resin allows to consider a single cooking step.
- each of the dielectric, resistive, conductive and final protection layers is performed by screen printing.
- the present invention also relates to an article provided with a heating element according to the invention deposited on a metal substrate, in particular aluminum or aluminum alloy.
- the heating element according to the invention surprisingly has a certain flexibility enabling it to remain operational when the metal substrate on which the heating element is deposited has to be constrained.
- the invention is aimed in particular at an article or culinary utensil comprising a heating element according to the invention and, on the face of the substrate not comprising said heating element, an enamel coating or a non-stick coating, in particular a resin-based coating.
- fluorocarbon for example based on PTFE.
- the invention finally relates to a method of manufacturing an article, in particular a culinary article, comprising a first step of depositing an enamel or non-adhesive coating, in particular based on resin fluorocarbon, for example based on PTFE, on one of the mutually opposite faces of a metal substrate, in particular aluminum or aluminum alloy, and a second deposition step on the other side of the substrate, a heating element manufactured in accordance with the method of the present invention.
- FIG. 1 represents a schematic cross-sectional view of the structure of a heating element according to the invention deposited on a substrate
- Figure 2 shows the heating element of Figure 1 deposited on the substrate, itself covered with a coating, for example a release coating.
- a substrate 1 made of aluminum or aluminum alloy.
- the substrate 1 is commonly a disk but any other form can of course be considered.
- the face 1a of the substrate 1 is covered by at least one continuous dielectric layer 2 and formed of resin and dielectric charges.
- the dielectric layer 2 is covered by a resistive layer 3 formed of resin and electrically conductive charges.
- the resistive layer 3 is in the form of a track whose dimensions such as length and thickness can of course be adapted according to the desired resistance.
- the track forming the resistive layer 3 may for example be in the form of a spiral of which only the sections of each convolution are shown in FIGS. 1 and 2.
- On the resistive layer 3 is deposited at least one conductive layer 4 formed of resin and fillers. electrically conductive.
- This conductive layer 4 which covers only a small portion of the resistive layer 3, is intended for the electrical connection of the resistive layer 3.
- At least one final protective layer 5, formed of resin and dielectric fillers, is deposited on the entire surface except on the conductive layer 4.
- this final protective layer 5 thus covers the resistive layer 3 as well as certain zones 2a of the dielectric layer 2, said zones 2a being situated at the location of the interstices 3a left free by the resistive layer 3, when it is in the form of a track.
- the heating element 6 consists of the assembly formed of the dielectric 2, resistive 3, conductive 4 and final protection 5 layers.
- the dielectric layers 2, resistive 3, conductive 4 and final protection 5 comprise the same organic resin.
- this resin comprises at least one compound chosen from a polyamide imide (PAI), a polyimide (PI), a polyether sulphone (PES), a polyether imide (PEI), a polyphenylene sulphone (PPS), a silicone and a epoxy resin.
- PAI polyamide imide
- PI polyimide
- PES polyether sulphone
- PEI polyether imide
- PPS polyphenylene sulphone
- the dielectric charges of any dielectric layer 2 may comprise at least one element chosen from mica, alumina, silica, clay, quartz, talc, glass and boron nitride.
- the particle size of the dielectric charges is decisive, in particular in the case where each dielectric layer 2 is applied by screen printing, so as not to seal the cells of the screen.
- the dielectric charges have a mean dimension of less than 25 ⁇ m, preferably less than 10 ⁇ m.
- the weight proportion of dielectric charges included in any dielectric layer 2 is adjusted to obtain electrical insulation between the resistive layer 3 and the substrate 1 when a potential difference of at least 1250 V is applied between said resistive layer 3 and substrate 1 for at least one minute.
- any dielectric layer 2 comprises from 30 to 70% by weight, preferably from 40 to 50% by weight, of dielectric charges and from 30 to 70% by weight, preferably from 50 to 60% by weight. weight, of pure resin or in solution, said solution comprising at least 10% by weight of pure resin.
- weight proportions make it possible to obtain a sufficiently fluid composition to envisage the application by screen-printing of each dielectric layer 2.
- each dielectric layer 2 retains after cooking a certain flexibility allowing it to withstand the external stresses which can be exercised during the final elaboration of the article.
- the electrically conductive fillers included in the composition of any resistive layer 3, but also of any conductive layer 4, comprise at least one element chosen from inorganic, metallic, ceramic or composite particles with electrical conduction properties. It is thus possible to choose, as electrically conductive fillers, particles of silver, copper, graphite, carbon, nickel, palladium, nitrides or carbides, and in particular nitrides and carbides of zirconium, hafnium or of titanium. Among the composite particles, particular mention may be made of coated particles such as glass particles coated with metal, for example coated with silver.
- the particle size of the electrically conductive charges is adapted to the mode of application envisaged for the application of each resistive layer 3 and of each conductive layer 4.
- the electrically conductive charges of each resistive layer 3 and of each conductive layer 4 have an average dimension of less than 20 ⁇ m, and preferably of between 1 and 5 ⁇ m.
- the thickness of any resistive layer 3 and the proportion by weight of electrically conductive charges included in this resistive layer 3 are preferably adapted to provide, as a function of the width and the length of the resistive track thus constituted in this resistive layer 3, a resistance of 5 to 1000 ⁇ .
- any resistive layer 3 comprises from 50 to 85% by weight, preferably from 60 to 70% by weight, of electrically conductive charges and from 15 to 50% by weight, preferably from 30 to 40% by weight. by weight, of pure resin or in solution, said solution comprising at least 10% by weight of pure resin.
- Each conductive layer 4 comprises a weight proportion of electrically conductive charges of at least 70%, the weight ratio of electrically conductive charges on pure resin being greater than or equal to 9.
- the final protective layer 5 has the same composition as the dielectric layer 2.
- the heating element 6 has some flexibility. This could not be achieved with the heating elements of the state of the art which consist of enamels, the latter breaking under the effect of a stress, even low. For example, when the assembly consisting of the substrate 1 and the heating element 6 is stressed, no breakage of the heating element 6 is observed to a radius of curvature of the order 210 mm for an aluminum substrate 1 of about 2 mm thick and a heating element 6 having a thickness of about 500 microns.
- the method of manufacturing the heating element 6 comprises the following steps:
- the metal substrate such as aluminum or aluminum alloy
- the metal substrate is applied to at least one dielectric layer 2 formed of resin and dielectric fillers
- at least one resistive layer 3 formed of resin and electrically conductive fillers is applied, this resistive layer 3 being applied to the at least one dielectric layer 2 deposited in the preceding step, either on the dielectric layer 2, as in the embodiment shown in FIGS. 1 and 2, or on at least one of the dielectric layers 2, it being specified that the last dielectric layer 2 applied is necessarily coated with at least one resistive layer 3
- At least one conductive layer 4 formed of resin and electrically conductive charges is applied.
- at least one final protective layer 5 formed of resin and dielectric charges is applied. It is of course possible to carry out a preliminary step of mechanical or chemical treatment of the face 1a of the substrate 1 to allow optimized attachment of the first dielectric layer 2 to the substrate 1.
- each of the dielectric layers 2, resistive 3, conductive 4 and final protection 5 is preferably made by screen printing, thus allowing excellent control of the thickness of each of the layers 2, 3, 4 and 5.
- a single baking step is carried out to obtain the polymerization of the resin used in the composition of said layers 2, 3, 4 and 5. Thanks to this single stage of cooking, one obtains a saving of energy, a gain of handling even a gain of place.
- the thickness of the set of dielectric layers 2 is between 30 and 300 ⁇ m and preferably between 90 and 150 ⁇ m.
- heating element 6 shown in FIGS. 1 and 2 comprising a dielectric layer 2, a resistive layer 3, a dielectric layer 4 and a final protective layer 5, it is quite possible to produce a heating element that requires the application of two, three or more of one or the other dielectric layers 2, resistive 3, conductive 4 and final protection 5 to obtain the thicknesses mentioned above.
- This variant is more particularly applicable for the realization of the dielectric layer 2.
- a superposition of several dielectric layers 2 is made to reach the thickness indicated above for all of the dielectric layers 2.
- FIG. 2 shows the heating element 6 deposited on the face 1a of the substrate 1 illustrated in FIG. 1.
- the face Ib of the substrate 1 is coated with a coating 7.
- This coating 7 can be made enamel or be anti-adhesive, it may be based on fluorocarbon resin, for example based on PTFE. Multiple applications using the heating element 6 according to the invention can be envisaged.
- Non-limiting, include cookware, kettles, irons.
Landscapes
- Resistance Heating (AREA)
- Surface Heating Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0406380A FR2871650B1 (fr) | 2004-06-11 | 2004-06-11 | Element chauffant, son procede de fabrication, article dote d'un tel element et son procede de fabrication |
| PCT/FR2005/001365 WO2006003282A1 (fr) | 2004-06-11 | 2005-06-03 | Element chauffant, son procede de fabrication, article dote d'un tel element et son procede de fabrication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1757168A1 true EP1757168A1 (fr) | 2007-02-28 |
Family
ID=34945987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05775284A Withdrawn EP1757168A1 (fr) | 2004-06-11 | 2005-06-03 | Element chauffant, son procede de fabrication, article dote d'un tel element et son procede de fabrication |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8481902B2 (fr) |
| EP (1) | EP1757168A1 (fr) |
| JP (1) | JP2008502116A (fr) |
| CN (1) | CN100515145C (fr) |
| FR (1) | FR2871650B1 (fr) |
| RU (1) | RU2378803C2 (fr) |
| WO (1) | WO2006003282A1 (fr) |
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| FR2934591B1 (fr) * | 2008-07-29 | 2011-02-11 | Seb Sa | Article comprenant un revetement ceramique et procede de fabrication d'un tel article mettant en oeuvre un laser. |
| FR2935246B1 (fr) * | 2008-08-29 | 2010-09-03 | Seb Sa | Article culinaire comportant un revetement antiadhesif a proprietes ameliorees d'anti-adherence |
| FR2937236B1 (fr) * | 2008-10-16 | 2010-11-26 | Seb Sa | Article culinaire comportant un revetement antiadhesif presentant des proprietes ameliorees d'adherence au support |
| FR2937235B1 (fr) | 2008-10-16 | 2010-11-12 | Seb Sa | Articule culinaire comportant un revetement antiadhesif presentant des proprietes ameliorees d'adherence au support |
| EP2206801A1 (fr) * | 2008-12-24 | 2010-07-14 | Seb Sa | Ustensiles de cuisson composites comprenant un revêtement de protection vitreux |
| FR2951348B1 (fr) * | 2009-10-12 | 2012-02-03 | Tornier Sa | Element chauffant et appareil chirurgical le mettant en oeuvre |
| FR2974993B1 (fr) | 2011-05-13 | 2014-04-11 | Seb Sa | Recipient de chauffe pour le chauffage d'aliments et appareil transportable comprenant un tel recipient de chauffe |
| US10137264B2 (en) | 2011-07-13 | 2018-11-27 | Fisher & Paykel Healthcare Limited | Respiratory assistance apparatus |
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| FR2868276B1 (fr) | 2004-03-30 | 2006-05-26 | Seb Sa | Article culinaire presentant une resistance a la rayure amelioree |
| FR2882240B1 (fr) | 2005-10-05 | 2007-11-30 | Seb Sa | Article emaille comprenant un revetement compatible avec un mode de chauffage par induction et son procede de fabrication |
| DE102006002264A1 (de) | 2006-01-17 | 2007-07-19 | BSH Bosch und Siemens Hausgeräte GmbH | Pyrolysefester Beschichtungslack |
| EP1835002B1 (fr) | 2006-03-14 | 2014-07-23 | Cerasol Hong Kong Limited | Composition de revêtement céramique non collante et procédé |
| DE102006050102A1 (de) | 2006-10-24 | 2008-04-30 | Epg (Engineered Nanoproducts Germany) Ag | Alkaliresistente Beschichtung auf Leichtmetalloberflächen |
| FR2917958B1 (fr) | 2007-06-29 | 2009-09-11 | Seb Sa | Article culinaire emaille anti-rayures et procede de fabrication d'un tel article. |
| FR2934591B1 (fr) | 2008-07-29 | 2011-02-11 | Seb Sa | Article comprenant un revetement ceramique et procede de fabrication d'un tel article mettant en oeuvre un laser. |
| FR2935246B1 (fr) | 2008-08-29 | 2010-09-03 | Seb Sa | Article culinaire comportant un revetement antiadhesif a proprietes ameliorees d'anti-adherence |
| FR2937236B1 (fr) | 2008-10-16 | 2010-11-26 | Seb Sa | Article culinaire comportant un revetement antiadhesif presentant des proprietes ameliorees d'adherence au support |
| FR2937235B1 (fr) | 2008-10-16 | 2010-11-12 | Seb Sa | Articule culinaire comportant un revetement antiadhesif presentant des proprietes ameliorees d'adherence au support |
| EP2206801A1 (fr) | 2008-12-24 | 2010-07-14 | Seb Sa | Ustensiles de cuisson composites comprenant un revêtement de protection vitreux |
| FR2962937B1 (fr) | 2010-07-26 | 2019-05-17 | Seb Sa | Article comprenant un revetement sol-gel muni d'un decor fonctionnel et procede de fabrication d'un tel article. |
-
2004
- 2004-06-11 FR FR0406380A patent/FR2871650B1/fr not_active Expired - Fee Related
-
2005
- 2005-06-03 CN CNB2005800190289A patent/CN100515145C/zh not_active Expired - Fee Related
- 2005-06-03 US US11/629,231 patent/US8481902B2/en not_active Expired - Fee Related
- 2005-06-03 EP EP05775284A patent/EP1757168A1/fr not_active Withdrawn
- 2005-06-03 WO PCT/FR2005/001365 patent/WO2006003282A1/fr not_active Ceased
- 2005-06-03 JP JP2007526487A patent/JP2008502116A/ja active Pending
- 2005-06-03 RU RU2006143564/09A patent/RU2378803C2/ru not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006003282A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2871650B1 (fr) | 2006-09-22 |
| JP2008502116A (ja) | 2008-01-24 |
| RU2378803C2 (ru) | 2010-01-10 |
| RU2006143564A (ru) | 2008-07-27 |
| WO2006003282A1 (fr) | 2006-01-12 |
| US8481902B2 (en) | 2013-07-09 |
| CN1973577A (zh) | 2007-05-30 |
| CN100515145C (zh) | 2009-07-15 |
| US20080290088A1 (en) | 2008-11-27 |
| FR2871650A1 (fr) | 2005-12-16 |
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