Component, in particular a top plate and/or a burner cap of a gas hob having a non-stick and/or non-wetting coating, gas hob comprising such a component and method for manufacturing a component

Patent metadata

Field	Value
Publication number	US-12543746-B2
Application number	US-202017776877-A
Country	US
Kind code	B2
Filing date	Sep 29, 2020
Priority date	Nov 15, 2019
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

The present invention relates to component, in particular a top plate ( 2 ) for a gas hob ( 1 ) and/or a burner cap ( 6 a, 6 b ) of a gas burner ( 5 a, 5 b ) for a gas hob ( 1 ), having a non-stick and/or non-wetting coating ( 12 ) obtainable by a process characterised by the following steps, a) providing a component, in particular a top plate ( 2 ) and/or a burner cap ( 6 a, 6 b ), having an upper surface ( 7 a ) and a bottom surface ( 11 b ), b) preferably, pretreating of at least the upper surface of the component, in particular the top plate or the burner cap, for providing a surface having a roughness being suitable for applying a non-stick and/or non-wetting coating, by mechanical treatment, physical treatment or chemical treatment, in particular by sand-blasting and/or laser treatment and/or a surface activation treatment, particularly a plasma treatment, and/or an enameling process to form a ground layer ( 13 ), thus applying an enamel layer onto the upper surface of the component, in particular the top plate or the burner cap, c) applying the non-stick and/or non-wetting coating ( 12 ) to the upper surface ( 11 a ) of the component, in particular a top plate ( 2 ) and/or a burner cap ( 6 a, 6 b ), or the surface ( 14 a ) of the ground layer ( 13 ), wherein the non-stick and/or non-wetting coating ( 12 ) comprises at least one layer ( 17 ) that is obtained by a sol-gel process from a first composition comprising a silica sol and a silane. The invention further relates to a cooking appliance ( 1 ), in particular a gas hob comprising such a component, in particular a top plate ( 2 ) and/or a burner cap ( 6 a, 6 b ), and a method for manufacturing such a component, in particular a top plate ( 2 ) and/or a burner cap ( 6 a, 6 b ).

First claim

The invention claimed is:

1 . A method for manufacturing a coated top plate for a gas hob and/or a coated burner cap of a gas burner for a gas hob, comprising at least the following steps: providing a top plate and/or a burner cap having an upper surface and a lower surface, pretreating at least the upper surface of the top plate and/or burner cap by mechanical treatment, physical treatment or chemical treatment to form a ground layer having a surface roughness suitable for applying a non-stick and/or non-wetting coating, and applying at least one layer of the non-stick and/or non-wetting coating to a surface of the ground layer, performing an activation process using plasma technology on at least a part of a surface of the non-stick and/or non-wetting coating in order to provide an activated surface area, wherein the activation process increases surface tension within the activated surface area, and applying a printing to the activated surface area of the non-stick and/or non-wetting coating by means of ink technology, wherein the step of pretreating comprises applying a protective layer to the upper surface of the top plate and/or burner cap, applying an enamel powder onto the surface of the protective layer, and heating the enamel powder to provide said ground layer with the roughness suitable for applying the non-stick and/or non-wetting coating.

2 . The method according to claim 1 , wherein the step of pretreating comprises applying a protective layer comprising enamel and/or aluminium to at least the upper surface of the top plate and/or burner cap and pretreating a surface of the protective layer by sandblasting and/or laser treatment and/or an enamelling process to form the ground layer.

3 . The method according to claim 2 , wherein the step of pretreating comprises applying an enamel powder onto the surface of the protective layer, and heating the enamel powder to provide said ground layer with the roughness suitable for applying the non-stick and/or non-wetting coating.

4 . The method according to claim 2 , wherein the non-stick and/or non-wetting coating comprises a first layer and a second layer, wherein the first layer of the non-stick and/or non-wetting coating is applied to the surface of the ground layer, and wherein the second layer of the non-stick and/or non-wetting coating is applied to the first layer of the non-stick and/or non-wetting coating.

5 . The method according to claim 4 , wherein the first layer of the non-stick and/or non-wetting coating is obtained by a sol-gel process from a first composition comprising a silica sol and a silane.

6 . The method according to claim 5 , wherein the second layer of the non-stick and/or non-wetting coating is obtained by a sol-gel process from a second composition comprising a silica sol, a silane and a siloxane.

7 . The method according to claim 6 , wherein the siloxane is present in said second composition in an amount of 0.1 to 2 wt %.

8 . The method according to claim 5 , wherein the silica sol is present in an amount of 15 to 70 wt % and/or the silane is present in an amount of 2 to 70 wt % within the first composition.

9 . The method according to claim 5 , wherein the silane is an organoalkoxysilane and/or a fluoralkoxysilane.

10 . The method according to claim 5 , wherein the first composition comprises an organic solvent.

11 . The method according to claim 10 , wherein the organic solvent is present in said first composition in an amount of 10 to 60 wt %, and/or a catalyst is present in said first composition in an amount of 0.1 to 5 wt %.

12 . The method according to claim 5 , wherein the first composition comprises a siloxane.

13 . The method according to claim 5 , wherein the first composition comprises pigments and/or dyes and/or filling materials and/or further additives.

14 . The method according to claim 2 , wherein the protective layer has a thickness between 50 and 250 μm.

15 . The method according to claim 1 , wherein the top plate and/or burner cap comprises corrosive steel, stainless steel, glass, or glass ceramics.

16 . The method according to claim 1 , wherein: the ground layer is an enamel layer obtained by the enamelling process and has a layer thickness between 10 and 80 μm.

17 . The method according to claim 1 , wherein said surface of the ground layer has a surface roughness between Ra 0.01 μm to 10.00 μm.

18 . The method according to claim 1 , wherein:
the non-stick and/or non-wetting coating provides an activated surface area activated by an activation process that increases surface tension within the activated surface area, using plasma technology, and a printing is applied to the activated surface area by means of ink technology.

19 . The method according to claim 1 , wherein:
the top plate and/or a burner cap is made of low-carbon steel, wherein the upper surface of the top plate and/or a burner cap is roughened by sand-blasting or by laser treatment to achieve a first surface roughness of Ra 0.01 μm to 10.00 μm according to ISO 4287:1997, a protective layer is applied over the upper surface of the top plate and/or burner cap, said protective layer comprising a non-corrosive material selected from enamel and aluminum and having a thickness between 50 μm and 250 μm, said protective layer having an outer surface facing away from said top plate and/or burner cap, the ground layer comprises enamel applied to said outer surface of said protective layer, the ground layer having an outer surface facing away from said protective layer that has a second surface roughness up to about 3.5 μm according to ISO 4287:1997 provided by sand-blasting or by laser treatment of the outer surface of said ground layer, the non-stick and/or non-wetting coating comprises a first non-stick, non-wetting solgel coating layer that is deposited on the outer surface of said ground layer, said first non-stick, non-wetting coating layer having been deposited as a first composition comprising 30 wt. % to 70 wt. % silica sol and 10 wt. % to 40 wt. % silane that underwent a first condensation reaction therebetween to yield the first non-stick, non-wetting solgel coating layer, the non-stick and/or non-wetting coating comprises a second non-stick, non-wetting solgel coating layer that is deposited on an outer surface of said first non-stick, non-wetting coating layer, said second non-stick, non-wetting coating layer having been deposited as a second composition comprising 30 wt. % to 70 wt. % silica sol, 10 wt. % to 40 wt. % silane, and 0.1 wt. % to 2 wt. % siloxane that underwent a second condensation reaction therebetween to yield the second non-stick, non-wetting solgel coating layer; said second non-stick, non-wetting solgel coating layer having an outer surface having an activated surface area that has been activated using plasma technology, and a printing is applied to the activated surface area by ink technology, said activated surface area having a water-contact angel of at least 95°.

Assignees

• Electrolux Appliances AB

Inventors

• Schütz Tobias
• Wälzlein Klaus
• Tisselli Filippo

Classifications

• F24C15/12

  Side rests; Side plates; Cover lids; Splash guards; Racks outside ovens, e.g. for drying plates · CPC title

• C23C28/345

  with at least one oxide layer · CPC title

• C23C28/321

  with at least one metal alloy layer · CPC title

• F24C15/005

  Coatings for ovens · CPC title

• C23D5/04

  by dry methods · CPC title