EP0247922A1 - Kochgefäss mit einem Bräunungsüberzug für Mikrowellenöfen und Verfahren zum Herstellen des Überzuges - Google Patents

Kochgefäss mit einem Bräunungsüberzug für Mikrowellenöfen und Verfahren zum Herstellen des Überzuges Download PDF

Info

Publication number
EP0247922A1
EP0247922A1 EP87401085A EP87401085A EP0247922A1 EP 0247922 A1 EP0247922 A1 EP 0247922A1 EP 87401085 A EP87401085 A EP 87401085A EP 87401085 A EP87401085 A EP 87401085A EP 0247922 A1 EP0247922 A1 EP 0247922A1
Authority
EP
European Patent Office
Prior art keywords
mixtures
oxides
metals
lead
enamel
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Withdrawn
Application number
EP87401085A
Other languages
English (en)
French (fr)
Inventor
Philippe Durand
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.)
Verrerie Cristallerie D'arques J G Durand and Cie
Original Assignee
Verrerie Cristallerie D'arques J G Durand and Cie
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
Priority claimed from FR8607183A external-priority patent/FR2598903B1/fr
Priority claimed from FR8704801A external-priority patent/FR2613205B2/fr
Application filed by Verrerie Cristallerie D'arques J G Durand and Cie filed Critical Verrerie Cristallerie D'arques J G Durand and Cie
Publication of EP0247922A1 publication Critical patent/EP0247922A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6491—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors
    • H05B6/6494—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors for cooking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S99/00—Foods and beverages: apparatus
    • Y10S99/14—Induction heating

Definitions

  • the browning containers for microwave ovens currently available on the market include a conductive film of tin oxide as a browning coating. They have a fairly limited lifespan. Depending on the use, the heating time becomes longer and longer. This deterioration in heating characteristics is related to the low resistance to detergents of the electrically conductive tin film.
  • This tin oxide film is normally applied by a process comprising heating the support with a solution of a thermally decomposable tin compound. In addition, this tin oxide film is not flame resistant, which limits the use of this dish exclusively in the microwave.
  • the subject of the present invention is a culinary container (dish, pan etc.) provided with a browning coating for a microwave oven, as well as a method for producing the coating, eliminating the drawbacks indicated above.
  • the browning coating which makes it possible to brown the food in a microwave oven, is applied to the external surface of the container.
  • the electrically conductive metallic elements are no longer provided by a thermally decomposable compound, they are incorporated into an enamel which can be applied in different ways to an unheated substrate (which widens the possibility of choice as to the nature of the electro element -conductor and greatly facilitates the implementation of the process).
  • a protective enamel layer can be applied by superimposition on the electrically conductive enamel layer.
  • the present culinary container is therefore characterized in that its browning coating, which is external, essentially comprises a heating layer, of lead-free enamel in which are incorporated electrically conductive elements in the form of a metal powder composed of at least one substance chosen from electrically conductive metals and their mixtures, the oxides of these metals and their mixtures, and mixtures of these metals and their oxides, said powder being intimately mixed with enamel.
  • electrically conductive elements in the form of a metal powder composed of at least one substance chosen from electrically conductive metals and their mixtures, the oxides of these metals and their mixtures, and mixtures of these metals and their oxides, said powder being intimately mixed with enamel.
  • metals mention may be made of zinc, aluminum, copper, nickel, chromium, transition elements, in particular iridium, platinum, ruthenium, rhodium, palladium, silver, gold. , mixtures of these metals.
  • the oxides which can be used are, in particular, those of the abovementioned metals and their mixtures, and mixtures of metals and oxides can also be used.
  • Zinc, transition metals, corresponding oxides and mixtures of these substances are preferred; they provide particularly strong and durable coatings, resistant well to detergents and acids.
  • the proportion of metallic powder in said heating layer is generally from 15 to 40% by weight.
  • Said heating layer is advantageously covered with a protective layer of lead-free enamel.
  • the thickness of the layers is approximately 12 to 30 microns for the first and 10 to 20 microns for the second.
  • the lead-free enamel of the heating layer or the protective layer can be based on acrylic resins including various mineral substances such as oxides, anhydrides, salts.
  • the process according to the invention for producing a browning coating on a culinary container for a microwave oven is characterized in that a layer of lead-free enamel containing an intimate mixture is deposited on the external surface of the container.
  • a metallic powder composed at least one substance chosen from electrically conductive metals and their mixtures, the oxides of these metals and their mixtures, and mixtures of these metals and their oxides, the layer thus formed being subjected to baking at a temperature included between 620 and 800 ° C to provide a heating layer, in which the proportion of metal powder is generally 15 to 40% by weight. More particularly usable substances have been mentioned above.
  • a protective lead-free enamel protective layer is advantageously deposited, after which all of the two layers are subjected to said cooking, the thicknesses of which are those indicated above.
  • the lead-free enamel used for the two coats can be as defined above.
  • This enamel is said to be lead-free, because its lead content (toxic metal) is much lower than the maximum content accepted by the standards existing in the various countries for household or culinary utensils, the analysis being made on acetic acid at 4% by weight, in which the container has been soaked for 24 hours at room temperature.
  • each of the two layers can be carried out by screen printing, hot, in which case a lead-free enamel with a hot-melt medium melting at around 40-60 ° C. is used, enamel which is applied through a conductive screen-printed fabric heated to a temperature of around 60-80 * C.
  • each of the two layers can also be carried out by decalcomania, at room temperature, in which case a lead-free enamel with an oily medium is used.
  • the deposit can also be obtained by a transfer process: the enamel layer is deposited, hot or cold depending on the nature of the enamel, by means of a plate or a screen, on a plate or a membrane, then it is taken up with a silicone-based pad to be transferred to the external surface of the container to be coated.
  • the lead-free enamel, initially in the solid state, used for the heating layer comprises, at a rate of 25 to 30% by weight, a hot-melt or thermoplastic medium which is a mixture of acrylic resins and a plasticizer of these resins and, in an amount of 15 to 40% by weight, an electrically conductive metal powder, for example zinc powder or zinc oxides, or at least one transition metal or oxide of such a metal, or a mixture of these substances, the remainder consisting of various mineral substances (comprising the following constituents: SiO 2 , B 2 0 3 , Al 2 O 3 , ZnO, Li 2 O, ZrO 2 , BaO, F 2 , Sn0 2 , TiO 2 ).
  • the hot-melt medium melts at a temperature of 40 to 60 * C.
  • the heating layer is therefore deposited by screen printing, by heating the conductive screen fabric, on which the enamel is spread, at a temperature of 60 to 80 ° C. , by direct heating (by Joule effect) or indirect (for example by means of infrared rays).
  • a heat application time of 30 seconds is sufficient to form the coating on the outer surface of the container, placed under the screen fabric.
  • the protective layer is produced in the same way, with a lead-free enamel of the same composition, except that it does not contain any electrically conductive metallic powder; it is therefore richer in various mineral substances.
  • the coating comprising the two layers is baked in an annealing oven (of the annealing arch type), at a temperature between 620 and 800 ° C.
  • the total duration of the cooking cycle is 50 to 60 minutes.
  • the first layer has a thickness of approximately 15 to 25 microns and the second has a thickness of approximately 10 to 15 microns, the optimum thickness of the assembly of the two layers being 25 to 30 microns.
  • the lead-free enamels used for each of the two layers are initially oily.
  • Their oily medium which represents 15 to 20% of their weight, is a mixture of acrylic resins and terpene oils. Their other constituents are qualitatively identical to those of the two enamels described in Example 1.
  • the proportion of electrically conductive powder in the enamel used for the heating layer is, as in Example 1, from 15 to 40% by weight.
  • the heating layer is deposited, then the protective layer, by decal, at room temperature.
  • the thickness of the layers is approximately 20 microns for the first and approximately 10 microns for the second, the optimum thickness of the assembly of the two layers being 25 to 30 microns.
  • Example 1 The whole of the two layers is cooked as in Example 1.
  • an empty dish, 6 millimeters thick, coated by the method according to example 1 or 2 reaches a temperature of 300 ° C. after 5 minutes of exposure in a microwave oven, instead of 80 at 100 * C without the coating.
  • the electrically conductive metal contained in the coating allows the temperature of the dish to rise enough to brown the food, which will be placed in the dish. It is noted, on the other hand, that there is no electric arc, that there are therefore no excessive hot spots, which could destroy the coating; it is assumed that this stabilization of the temperature rise is due to the presence in the coating of metal oxides, whether they are initially introduced into the heating layer or whether they are formed from the metal or metals initially introduced work, during the final coating firing operation.
  • the life of the coating is practically unlimited.
  • the enamels which are the basis of its composition, provide resistance to fire and chemicals and the fact that the coating comprises two layers reinforces this resistance.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cookers (AREA)
EP87401085A 1986-05-21 1987-05-14 Kochgefäss mit einem Bräunungsüberzug für Mikrowellenöfen und Verfahren zum Herstellen des Überzuges Withdrawn EP0247922A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8607183 1986-05-21
FR8607183A FR2598903B1 (fr) 1986-05-21 1986-05-21 Recipient culinaire pourvu d'un revetement brunisseur pour four a micro-ondes et procede de realisation du revetement
FR8704801A FR2613205B2 (fr) 1987-04-06 1987-04-06 Recipient culinaire pourvu d'un revetement brunisseur pour four a micro-ondes et procede de realisation du revetement
FR8704801 1987-04-06

Publications (1)

Publication Number Publication Date
EP0247922A1 true EP0247922A1 (de) 1987-12-02

Family

ID=26225248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401085A Withdrawn EP0247922A1 (de) 1986-05-21 1987-05-14 Kochgefäss mit einem Bräunungsüberzug für Mikrowellenöfen und Verfahren zum Herstellen des Überzuges

Country Status (2)

Country Link
US (1) US4751358A (de)
EP (1) EP0247922A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294503A1 (de) * 1987-06-10 1988-12-14 Degussa Aktiengesellschaft Verwendung einer edelmetallhaltigen Paste zur Herstellung von Bräunungsgeschirr für Mikrowellenöfen
EP0296312A3 (en) * 1987-06-25 1989-09-27 W.C. Heraeus Gmbh Microwave resistant precious metal decoration
US4904836A (en) * 1988-05-23 1990-02-27 The Pillsbury Co. Microwave heater and method of manufacture
EP0374302A1 (de) * 1988-12-23 1990-06-27 Degussa Aktiengesellschaft Bräunungsgeschirr für Mikrowellenöfen
FR2671709A1 (fr) * 1991-01-17 1992-07-24 Sou Kuein Chiu Film conducteur de la chaleur pour absorber les ondes electromagnetiques et l'energie des micro-ondes.
EP0679355A1 (de) * 1994-04-26 1995-11-02 Winterling Porzellan AG Speisengefäss zur induktiven Erwärmung und Verfahren zu dessen Herstellung
FR2841432A1 (fr) * 2002-06-20 2003-12-26 Saint Gobain Procede de fabrication de motifs electroconducteurs sur un substrat transparent et substrat obtenu
CN109106191A (zh) * 2017-06-26 2019-01-01 佛山市顺德区美的电热电器制造有限公司 烹饪机及其的控制装置

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5308945A (en) * 1986-03-17 1994-05-03 James River Corporation Microwave interactive printable coatings
US4876423A (en) * 1988-05-16 1989-10-24 Dennison Manufacturing Company Localized microwave radiation heating
US4959516A (en) * 1988-05-16 1990-09-25 Dennison Manufacturing Company Susceptor coating for localized microwave radiation heating
US4864089A (en) * 1988-05-16 1989-09-05 Dennison Manufacturing Company Localized microwave radiation heating
US4866235A (en) * 1989-01-24 1989-09-12 The Boc Group, Inc. Microwavable containers useful for controlled heating
US5053594A (en) * 1989-11-09 1991-10-01 Rich-Seapak Processing Corporation Cook and serve food package for the storing and heating by microwave energy of a food item
US5182425A (en) * 1990-11-06 1993-01-26 The Pillsbury Company Thick metal microwave susceptor
US5254820A (en) * 1990-11-19 1993-10-19 The Pillsbury Company Artificial dielectric tuning device for microwave ovens
ATE127762T1 (de) * 1990-12-21 1995-09-15 Procter & Gamble Mikrowellensuszeptor mit einer beschichtung aus silikatbindemittel und aktiven bestandteilen.
US5389767A (en) * 1993-01-11 1995-02-14 Dobry; Reuven Microwave susceptor elements and materials
KR100505363B1 (ko) * 2002-01-15 2005-10-11 주식회사 이엘코리아 알루미늄 법랑제조용 무연조성물

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302632A (en) * 1963-12-06 1967-02-07 Wells Mfg Company Microwave cooking utensil
DE1454210A1 (de) * 1962-02-16 1972-03-30 Oberschwaeb Metallwaren Emailliertes Koch-,Brat- oder Backgeschirr und Verfahren zu dessen Herstellung
FR2224557A1 (en) * 1973-04-09 1974-10-31 Oberschwaeb Metallwaren Non-stick coatings for cooking utensils - porous enamel coatings filled with silicones are superior to ptfe.
FR2334328A1 (fr) * 1975-12-09 1977-07-08 Bosch Siemens Hausgeraete Recipient destine a recevoir des aliments a chauffer dans un four micro-ondes
FR2382878A1 (fr) * 1977-03-11 1978-10-06 Nippon Electric Glass Co Plats a rotir destines a etre utilises dans les fours a micro-ondes
FR2390883A1 (fr) * 1977-05-09 1978-12-08 Special Metals Corp Procede pour augmenter la susceptibilite d'une matiere au chauffage par des micro-ondes
FR2403710A1 (fr) * 1977-09-19 1979-04-13 Krantz Quentin Article chauffant et methode pour chauffer cet article
FR2432056A1 (fr) * 1978-07-26 1980-02-22 Baumann Stanz Email Procede pour vitrifier de facon resistante le fond des recipients, emailles et recipients ainsi obtenus
US4398077A (en) * 1980-10-06 1983-08-09 Raytheon Company Microwave cooking utensil
US4495392A (en) * 1978-08-28 1985-01-22 Raytheon Company Microwave simmer pot
DE3424635A1 (de) * 1984-07-04 1986-01-16 Württembergische Metallwarenfabrik AG, 7340 Geislingen Emailliertes kochgeschirr

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190757A (en) * 1976-10-08 1980-02-26 The Pillsbury Company Microwave heating package and method
US4410779A (en) * 1978-04-03 1983-10-18 Raytheon Company Combination microwave oven control system
FR2446098A1 (fr) * 1979-01-09 1980-08-08 Tournus Manuf Metallurg Appareil de cuisson a balancelle
US4266108A (en) * 1979-03-28 1981-05-05 The Pillsbury Company Microwave heating device and method
DE3478339D1 (en) * 1983-07-21 1989-06-29 Microwave Ovens Ltd Trivet for a microwave oven

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1454210A1 (de) * 1962-02-16 1972-03-30 Oberschwaeb Metallwaren Emailliertes Koch-,Brat- oder Backgeschirr und Verfahren zu dessen Herstellung
US3302632A (en) * 1963-12-06 1967-02-07 Wells Mfg Company Microwave cooking utensil
FR2224557A1 (en) * 1973-04-09 1974-10-31 Oberschwaeb Metallwaren Non-stick coatings for cooking utensils - porous enamel coatings filled with silicones are superior to ptfe.
FR2334328A1 (fr) * 1975-12-09 1977-07-08 Bosch Siemens Hausgeraete Recipient destine a recevoir des aliments a chauffer dans un four micro-ondes
FR2382878A1 (fr) * 1977-03-11 1978-10-06 Nippon Electric Glass Co Plats a rotir destines a etre utilises dans les fours a micro-ondes
FR2390883A1 (fr) * 1977-05-09 1978-12-08 Special Metals Corp Procede pour augmenter la susceptibilite d'une matiere au chauffage par des micro-ondes
FR2403710A1 (fr) * 1977-09-19 1979-04-13 Krantz Quentin Article chauffant et methode pour chauffer cet article
FR2432056A1 (fr) * 1978-07-26 1980-02-22 Baumann Stanz Email Procede pour vitrifier de facon resistante le fond des recipients, emailles et recipients ainsi obtenus
US4495392A (en) * 1978-08-28 1985-01-22 Raytheon Company Microwave simmer pot
US4398077A (en) * 1980-10-06 1983-08-09 Raytheon Company Microwave cooking utensil
DE3424635A1 (de) * 1984-07-04 1986-01-16 Württembergische Metallwarenfabrik AG, 7340 Geislingen Emailliertes kochgeschirr

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0294503A1 (de) * 1987-06-10 1988-12-14 Degussa Aktiengesellschaft Verwendung einer edelmetallhaltigen Paste zur Herstellung von Bräunungsgeschirr für Mikrowellenöfen
EP0296312A3 (en) * 1987-06-25 1989-09-27 W.C. Heraeus Gmbh Microwave resistant precious metal decoration
US4904836A (en) * 1988-05-23 1990-02-27 The Pillsbury Co. Microwave heater and method of manufacture
EP0374302A1 (de) * 1988-12-23 1990-06-27 Degussa Aktiengesellschaft Bräunungsgeschirr für Mikrowellenöfen
FR2671709A1 (fr) * 1991-01-17 1992-07-24 Sou Kuein Chiu Film conducteur de la chaleur pour absorber les ondes electromagnetiques et l'energie des micro-ondes.
EP0679355A1 (de) * 1994-04-26 1995-11-02 Winterling Porzellan AG Speisengefäss zur induktiven Erwärmung und Verfahren zu dessen Herstellung
FR2841432A1 (fr) * 2002-06-20 2003-12-26 Saint Gobain Procede de fabrication de motifs electroconducteurs sur un substrat transparent et substrat obtenu
CN109106191A (zh) * 2017-06-26 2019-01-01 佛山市顺德区美的电热电器制造有限公司 烹饪机及其的控制装置

Also Published As

Publication number Publication date
US4751358A (en) 1988-06-14

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