CN-122029380-A - Top plate for cooking device and method for manufacturing top plate for cooking device

Abstract

The invention provides a top plate for a cooker with excellent stain resistance and a manufacturing method of the top plate for the cooker. The top plate (1) for a cooking device is characterized by comprising a glass substrate (2) having a cooking surface (2 a) for supporting a cooking device and a back surface (2 b) on the opposite side of the cooking surface (2 a), and a decorative layer (3) disposed on the cooking surface (2 a) side of the glass substrate (2), wherein the decorative layer (3) contains glass and a pigment, and the pigment contains an extender pigment having an average particle diameter of 1.5 [ mu ] m or less and is substantially free of titanium oxide.

Inventors

• FUKUI ETSUJI

Assignees

• 日本电气硝子株式会社

Dates

Publication Date

20260512

Application Date

20240909

Priority Date

20231227

Claims (9)

1. 1. A top plate for a cooking device, comprising: A glass substrate having a cooking surface for supporting a cooking device and a back surface opposite to the cooking surface, and A decorative layer disposed on one side of the cooking surface of the glass substrate, The decorative layer comprises glass and pigment, The pigment contains an extender pigment having an average particle diameter of 1.5 mu m or less and is substantially free of titanium oxide.
2. 2. The top plate for a cooker as claimed in claim 1, wherein: The pigment further comprises a coloring pigment other than titanium oxide, The decorative layer contains 60 to 99 mass% of the glass, 0.1 to 30 mass% of the coloring pigment, and 0.1 to 30 mass% of the extender pigment in 100 mass% of the decorative layer.
3. 3. The top plate for a cooking device according to claim 2, wherein said extender pigment has a Mohs hardness of 5 or less.
4. 4. The top plate for a cooking device according to claim 2 or 3, wherein said extender pigment contains barium sulfate.
5. 5. The top plate for a cooking device according to claim 4, wherein the content of barium sulfate is less than 20% by mass in 100% by mass of the decorative layer.
6. 6. The top plate for a cooking device according to claim 4, wherein the content of barium sulfate and the content of the coloring pigment in 100 mass% of the decorative layer satisfy 0.1≤barium sulfate/(barium sulfate content+coloring pigment content). Ltoreq.0.85.
7. 7. The top plate for a cooking device according to claim 2 or 3, wherein the decorative layer has an arithmetic average roughness Ra of 0.72 μm or less.
8. 8. A top plate for a cooking device, comprising: A glass substrate having a cooking surface for supporting a cooking device and a back surface opposite to the cooking surface, and A decorative layer disposed on one side of the cooking surface of the glass substrate, The decorative layer comprises glass and pigment, The pigment contains a coloring pigment other than titanium oxide, The surface of the decorative layer has an arithmetic average roughness Ra of less than 0.61 mu m.
9. 9. A method for manufacturing a top plate for a cooker, which is used for manufacturing the top plate for a cooker according to claim 1 or 2, the method comprising: A step of preparing a glass substrate having a cooking surface for supporting a cooking device and a back surface opposite to the cooking surface; A step of applying a paint to the cooking surface of the glass substrate, wherein the paint contains a glass frit and a pigment, the pigment contains an extender pigment having an average particle diameter of 1.5 [ mu ] m or less and is substantially free of titanium oxide, and And heating the glass substrate coated with the paint to form a decorative layer.

Description

Top plate for cooking device and method for manufacturing top plate for cooking device Technical Field The present invention relates to a top plate for a cooker and a method for manufacturing the top plate for the cooker. Background A top plate for cooking is provided on the upper part of the electromagnetic cooker, the radiation heating cooker, the gas cooker, etc. In general, the top plate for a cooker includes a transparent or opaque glass substrate having a cooking surface for supporting a cooking device and a back surface opposite to the cooking surface. In addition, the cooking surface of the glass substrate may be provided with a decorative layer in order to improve the appearance of the top plate for a cooker. For example, patent document 1 discloses a top plate for a cooking device having a decorative layer containing glass and refractory filler powder on the cooking surface side of a glass substrate. However, when the cooker is used, the cooker such as a pan comes into contact with the decorative layer on the cooking surface of the top plate for the cooker, and for example, when the pan bottom is rubbed strongly by the decorative layer, the coating on the pan bottom peels off, and the metal on the pan bottom is scraped off to become dirt and transferred to the decorative layer. The transferred dirt significantly reduces the design of the top plate for the cooker. Prior art literature Patent literature Japanese patent application laid-open No. 2016-156570 Disclosure of Invention Problems to be solved by the invention In recent years, consumers have become increasingly concerned about design properties. Therefore, a top plate for a cooker is required to have a decorative layer excellent in stain resistance, which is a characteristic that even when rubbed by a cooking device such as a pan, stains are hardly generated by coating or metal peeling of the cooking device. In view of the above, an object of the present invention is to provide a top plate for a cooking device having excellent stain resistance and a method for manufacturing the same. Means for solving the problems The present inventors have found that, in order to improve the stain resistance of a decorative layer provided on a cooking surface of a glass substrate, the surface state (specifically, surface roughness) of the decorative layer should be appropriately controlled, and that, after adjusting the type and average particle diameter of pigment in the decorative layer, a top plate for a cooking device excellent in stain resistance and a method for manufacturing the top plate for a cooking device can be provided. Specifically, the top plate for a cooking device according to embodiment 1 of the present invention is characterized by comprising a glass substrate having a cooking surface for supporting a cooking device and a back surface opposite to the cooking surface, and a decorative layer disposed on the cooking surface side of the glass substrate, wherein the decorative layer contains glass and a pigment, and the pigment contains an extender pigment having an average particle diameter of 1.5 μm or less and is substantially free of titanium oxide. The term "substantially free" as used herein means, for example, 0.05 mass% or less in 100 mass% of the decorative layer. In the top sheet for a cooking device according to embodiment 2 of the present invention, it is preferable that in embodiment 1, the pigment further contains a coloring pigment other than titanium oxide, and the decorative layer contains 60 to 99 mass% of the glass, 0.1 to 30 mass% of the coloring pigment, and 0.1 to 30 mass% of the extender pigment in 100 mass% of the decorative layer. In the top plate for a cooking device according to embodiment 3 of the present invention, the extender pigment preferably has a mohs hardness of 5 or less in embodiment 2. In the top plate for a cooking device according to embodiment 4 of the present invention, preferably, in embodiment 2 or 3, the extender pigment contains barium sulfate. In the top plate for a cooking device according to embodiment 5 of the present invention, it is preferable that in embodiment 4, the content of barium sulfate in 100 mass% of the decorative layer is less than 20 mass%. In the top plate for a cooking device according to embodiment 6 of the present invention, in embodiment 4 or 5, the content of barium sulfate and the content of the coloring pigment in 100 mass% of the decorative layer preferably satisfy 0.1≤barium sulfate/(barium sulfate content+coloring pigment content). Ltoreq.0.85. In the top plate for a cooking device according to claim 7 of the present invention, it is preferable that in any one of claims 1 to 6, the decorative layer has an arithmetic average roughness Ra of 0.72 μm or less. The top plate for a cooking device according to claim 8 is characterized by comprising a glass substrate having a cooking surface for supporting a cooking device and a back surface opposite to the cooking surface, a