JP2005090906A - Top plate for cooking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a top plate for a cooking device having thermal resistance, high-grade sense and excellent abrasion resistance, being able to be colored in silver-gray harmonizing with the color of surrounding stainless for a system kitchen, and exhibiting no heterogeneity in the part where a high-temperature resin is adhered even if a temperature sensor is adhered by the high-temperature resin. <P>SOLUTION: This top plate has a substrate 11 made of translucent crystalline glass and comprises a first surface (used surface) 11a facing the outer part of the cooking device and a second surface (unused surface) 11b facing the inner part. A shading layer 12 made of a shading film 12a and an oxidation preventing film 12b formed by sputtering is formed on the second surface 11b of the substrate 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooker top plate.

  In addition to gas cookers that use traditional gas stoves, infrared cookers and electromagnetic heating (IH) cookers that use radiant heaters and halogen heaters will be used as household and commercial cookers. It has become.

  For example, materials such as glass, ceramics, and crystallized glass that have a low electromagnetic induction heating amount and low thermal expansion are used for the top plate used in an electromagnetic heating cooker from the viewpoint of thermal efficiency, safety, and thermal shock. I came.

  In addition, in gas cookers that use firewood or stainless steel as the top plate, the aesthetics and cleanability of the material are excellent, so non-metallic materials such as low thermal expansion glass, ceramics, and crystallized glass can be used. Has come to be used.

  The original role of the top plate for cookers is to prevent splashing of water, seasonings, food, etc. to the heating device. Recently, in addition to this role, cooking of heating devices, wiring, etc. It has also been required to improve the aesthetics by hiding the internal structure of the vessel.

  In the case of using a non-metallic material for the top plate, the first method for concealing the internal structure of the cooker by the top plate is to use a low-temperature expansion crystal colored darkly using a metal transition element as the top plate. It is to use a vitrified glass, for example, GC-190 manufactured by Nippon Electric Glass Co., Ltd. or seranium manufactured by Schott.

The second method is to form a light shielding film on the surface of a substrate made of transparent low expansion glass by using a printing method. For example, Patent Document 1 below describes a top plate in which a light shielding film made of glass and an inorganic pigment is provided on the surface of a transparent low expansion crystallized glass substrate. Since this light-shielding film has a higher thermal expansion coefficient than a substrate made of low expansion crystallized glass, Patent Document 1 suppresses the occurrence of cracks in this film by making the light-shielding film porous. Patent Document 2 below describes a top plate in which a raster-colored film made of a noble metal and a base metal is provided on the surface of a substrate made of transparent low expansion crystallized glass.
Japanese Patent Laid-Open No. 10-273342 Japanese Patent Publication No. 7-17409

  However, the first method has a high-class feeling, and in the system kitchen, a silver gray top plate that matches the surrounding stainless steel color cannot be obtained.

  Conventionally, the second method described above has a problem that the light-shielding film, particularly a porous light-shielding film made of glass and an inorganic pigment, has low wear resistance and easily peels off, making it difficult to handle. It was. Also, when the temperature sensor is bonded to the light-shielding film with heat-resistant resin, the heat-resistant resin penetrates the light-shielding film, and the part where the heat-resistant resin is attached is different when viewed from the use side of the top plate. Appearance was also a problem. Furthermore, the inorganic pigment and the noble metal constituting the light-shielding film have a problem that when the top plate is recycled, the glass is colored or glass defects such as blisters are generated.

  The object of the present invention is high heat resistance, high quality, and in the system kitchen, it can be made into silver gray color in harmony with the surrounding stainless steel color, has excellent wear resistance, and the temperature sensor is bonded with heat resistant resin Even so, it is an object of the present invention to provide a top plate for a cooking appliance in which the portion to which the heat-resistant resin is bonded does not appear to be foreign.

  To achieve the above object, the present invention comprises a substrate made of low expansion glass, having a first surface facing the outside of the cooker and a second surface facing the inside, and a sputtering method on the second surface of the substrate. The cooker top plate includes a light-shielding layer formed by the method, and the light-shielding layer includes a light-shielding film made of nitrogen-containing Si.

Further, the present invention consists low expansion glass, the second surface of the substrate having a second surface facing the first surface and the inner side facing the outer side of the cooker, Ar containing N ₂ 2 to 15 vol% There is provided a method for producing a top plate for a cooker that forms a light shielding layer including a light shielding film made of nitrogen-containing Si by sputtering Si in an atmosphere.

  The top plate of the present invention has a high-class feeling, and in the system kitchen, it becomes a silver gray color in harmony with the surrounding stainless steel color. In addition, the light-shielding layer including the light-shielding film made of nitrogen-containing Si has a relatively high heat resistance, so it cannot be used in a region facing the radiant heater that becomes high temperature, but the temperature rises due to heat conduction from the radiant heater. It can be used in the vicinity of the region or in the region facing IH.

  Moreover, since the light shielding layer formed by sputtering is smooth and has a dense structure, it has excellent wear resistance. Furthermore, even if this light shielding layer is a very thin film | membrane of 2 micrometers or less, for example, since it has high light shielding capability, the internal structure of cooking appliances, such as a heating apparatus and wiring, can be concealed effectively. In addition, since the heat resistant resin for attaching the temperature sensor does not penetrate into the light shielding layer, the portion to which the heat resistant resin is bonded does not look different.

  In addition, since this light shielding layer has a high light shielding performance and has a sufficient light shielding performance even if it is very thin, it should be thinly formed on the surface of the substrate even when a material having a large difference in thermal expansion coefficient from the substrate is used. Thus, sufficient light shielding performance can be obtained while preventing cracks from occurring in the light shielding layer.

In the cooking device top plate of the present invention, the light shielding film made of nitrogen-containing Si is preferably formed by sputtering Si in an Ar atmosphere having an N ₂ content of 2 to 15% by volume in the sputtering chamber. . That is, when the N ₂ content in the sputter chamber is less than 2% by volume, the heat resistance of the light shielding layer is lowered, and when it is more than 15% by volume, the visible light transmittance is increased and the appearance is brown. Become. A preferable range of the N ₂ content is 5 to 12.5%.

  The top plate for a cooker of the present invention has an excellent light-shielding ability when the average transmittance at a wavelength of 0.4 to 0.8 μm is 10% or less, preferably 7% or less, and more preferably 6% or less. The internal structure of the cooking device such as wiring can be concealed.

  When a pattern having a partial opening (for example, a mesh pattern) or a pattern having a general opening is formed in a predetermined region of the light shielding layer facing the radiant heater or the halogen heater, the wavelength of the top plate is 1 to 2.5 μm. The average transmittance in is likely to be 10% or more, and the thermal efficiency of these heaters is increased, which is preferable.

  Further, when only infrared light from red visible light needs to be transmitted as in the above-described region, light having a wavelength of 0.6 to 2.5 μm is transmitted through the aperture, and a wavelength of 0. It is preferable to form an infrared transmission film that conceals light of 4 to 0.6 μm because the internal structure of a cooking device such as a heating device and wiring can be concealed. As this infrared transmission film, an organic paint or a raster film is suitable.

  The top plate for a cooking device of the present invention is preferably provided with a light-shielding layer located in the liquid crystal display section because the liquid crystal display is easy to see. In addition, it is preferable to form an antireflection film on at least one surface of the substrate corresponding to the liquid crystal display portion, preferably the first surface and the second surface, because light from illumination or the like is hardly reflected and the liquid crystal display is easy to see. .

  The light shielding film made of nitrogen-containing Si may contain aluminum as long as the mass ratio is 1/10 or less of Si.

  The light shielding layer preferably includes an antioxidant film in addition to the light shielding film. The antioxidant film can be formed on the light shielding film and / or between the surface of the substrate and the light shielding film. The anti-oxidation film makes it difficult for the light-shielding film to be oxidized, and the alteration of the light-shielding film due to heat is suppressed. That is, when the anti-oxidation film is formed on the upper layer (air side) of the light-shielding film, the anti-oxidation film prevents the light-shielding film from being oxidized by oxygen in the air, and causes physical damage to the light-shielding film. Play a protective role. In addition, when the antioxidant film is formed between the surface of the substrate and the light shielding film, the antioxidant film functions to prevent the light shielding film from being oxidized by oxygen in the substrate (in the low expansion glass). Have.

  The antioxidant film includes a nitride, carbide or oxynitride of one or more metals selected from the group consisting of Si, Ti, Al, Nb, W, Mo, Ta and Sn, or It is preferable to include an oxide of one kind of metal selected from the group consisting of Si, Al and Ti because the anti-oxidation ability of the light shielding film is high.

  Further, when the antioxidant film is composed of components contained in the substrate (in the low expansion glass), specifically, Ti, Si or Al, nitrides, carbides, oxynitrides or oxides of these metals, the top When the plate is remelted as a glass raw material, it is preferable because the glass is not colored or glass defects such as blisters are not generated.

  The preferred form of the light shielding layer is, in order from the surface of the substrate, a first layer comprising a light shielding film having a geometric thickness of 10 to 1000 nm, preferably 15 to 700 nm, and a geometry of 10 to 1000 nm, preferably 15 to 700 nm. A second layer made of an antioxidant film having a chemical thickness.

In the above-described embodiment, in particular, when the antioxidant film includes SiN (Si ₃ N ₄ ), AlN, SiC, SiON, TiN, TiON, SiO ₂ , Al ₂ O ₃ , or TiO ₂ , the oxidation of the light shielding film is performed. Since it is excellent in the prevention effect, it is preferable.

  The top plate for a cooker according to the present invention may be provided with a decorative film in addition to the light shielding layer. Since the light shielding layer is provided on the second surface (non-use surface) side, the decorative film is preferably formed between the substrate and the light shielding layer or on the first surface (use surface).

  For example, a light-shielding layer is formed on the second surface (non-use surface) of the substrate, and a warning or warning message for use, an explanation of an indicator for displaying temperature or thermal power, etc. between the substrate and the light-shielding layer. Forming letters or figures is preferable because the letters and figures do not appear double, and even if a hard utensil cooking utensil such as pottery is used, the letters and figures are not scraped off. This is because the characters and figures are formed in contact with the light shielding layer, so that the reflection image of the letters and figures on the light shielding layer is not generated, and the characters and figures are formed on the second surface (non-use surface) of the substrate. This is because there is no direct contact between a character and a figure with a hard cooking utensil such as pottery.

  In addition, it is preferable that the decorative film, characters, or figures have a color tone different from that of the light-shielding layer or a gloss that is different from that of the light-shielding layer because the decorative film, characters, or figures are easy to see. Such a decorative film, characters, or figures may be formed by using any one of a vapor deposition method and a printing method. For example, when characters or graphics are formed by screen printing, it is possible to form many types of characters and graphics simply by changing the type of mesh (stencil) and ink. Is preferable.

As the low-expansion glass constituting the substrate, a material having high thermal shock resistance that can withstand rapid cooling from 600 ° C. can be used, and specifically, a material having a thermal expansion coefficient of 50 × 10 ⁻⁷ / ° C. or less. And low-expansion crystallized glass whose main crystal is low-expansion borosilicate glass, quartz glass, or β-quartz solid solution can be used. In particular, a glass having an average thermal expansion coefficient at 30 to 500 ° C. of −10 to + 30 × 10 ⁻⁷ / ° C., more preferably −10 to + 20 × 10 ⁻⁷ / ° C. has higher thermal shock resistance. During combustion, even if the temperature distribution in the low expansion glass plate increases, stress is less likely to occur and it is preferable that it is difficult to break. The low expansion glass constituting the substrate may be colored as long as it has translucency (property of transmitting visible light) and has little influence on the appearance of silver gray.

  In addition, when the substrate is formed of low-expansion glass having translucency (transmitting visible light), in the case of the top plate for an electromagnetic heating cooker, an indicator for indicating the amount of applied electric power or the like is displayed on the substrate. Even if it is provided on the second surface (non-use surface) side, the light of the indicator can be visually recognized from the first surface (use surface) side of the substrate. Accordingly, since it is not necessary to make a hole in the substrate for visually recognizing the light of the indicator, the top plate is less likely to be chipped or cracked.

  In addition, if the first surface and / or the second surface of the substrate is a rough surface, even if a glossy light-shielding layer is formed on the second surface (non-use surface) of the substrate, light from illumination or the like is shielded from light. It is not dazzling because the light from the lighting etc. is scattered. In particular, if the second surface (non-use surface) of the substrate is a rough surface and the first surface (use surface) is a smooth surface, the first surface (use surface) is less likely to be contaminated with seasonings, foods, etc. It is preferable because it is easy to wipe off.

  The surface roughness of the rough surface is preferably Rmax 0.5 to 30 μm. If the surface roughness of the rough surface is less than 0.5 μm, light from illumination or the like is hardly scattered, and the surface roughness of the rough surface When the thickness is larger than 30 μm, it is difficult to form the light shielding layer with a uniform thickness, and it becomes difficult to print characters and figures. In addition, the mechanical strength of the top plate is likely to decrease. The above smooth surface refers to a surface having a surface roughness (Rmax) of less than 0.5 μm.

  In addition, it is preferable that the top plate for a cooker of the present invention is subjected to antifouling treatment such as fluorine coating on the light-shielding film, the antioxidant film, or the decorative film, because it is excellent in cleaning properties.

  Hereinafter, the top plate for a cooker of the present invention will be described in detail based on examples.

  Table 1 shows Examples 1 and 2 and Comparative Examples 1 and 2 of the present invention. FIG. 1 is an explanatory view of a top plate for a cooker according to the first and second embodiments. Drawing 2 is an explanatory view of the top plate for cookers concerning other examples.

First, as shown in FIG. 1, the crystalline by heat treatment of the glass plates, transparent crystallized glass (manufactured by Nippon Electric Glass Co., Ltd. N-0,30~500 average linear thermal expansion coefficient in ° C is -5 × 10 ^{- 7} / ° C) was obtained. Then, as shown in FIG. 1, a light shielding layer 12 including a light shielding film 12a and an antioxidant film 12b is formed on the second surface 11b of the substrate 11 by a sputtering method so as to have the film material and film thickness shown in Table 1. Thus, the top plates 10 for the cooking devices of Examples 1 and 2 and Comparative Examples 1 and 2 were produced. The first light shielding film 12a was formed in an Ar atmosphere having an N ₂ content shown in Table 1, and the second antioxidant film 12b was formed in a 100% N ₂ atmosphere.

  The heat-resistant resin (GSX manufactured by Daishin Paint) is partially applied on the light-shielding layer formed as described above, and the portion where the heat-resistant resin is applied from the side where the light-shielding layer is not formed looks different. It was confirmed visually.

  The visible light transmittance at a wavelength of 0.4 to 0.8 μm was measured using a spectrophotometer. The visible light transmittance was measured by entering light having a wavelength of 0.4 to 0.8 μm from the side where the light shielding layer was not formed.

  The heat resistance was evaluated by the temperature at which film quality changes such as color change were observed when the top plate was heated in an electric furnace. That is, the higher the temperature at which film quality change such as color change is observed, the higher the heat resistance.

  As a result of the above test, Examples 1 and 2 were excellent in light shielding performance, high in heat resistance, and had an appearance of silver gray.

  Further, even when the heat-resistant resin was partially applied on the light-shielding layer, the portion where the heat-resistant resin was adhered from the side of the surface where the light-shielding layer was not formed did not look different.

  On the other hand, Comparative Example 1 had low heat resistance, and Comparative Example 2 had a brown appearance.

  The top plate 20 for the cooker of the embodiment shown in FIG. 2 has a printed layer 13 (film thickness) containing glass frit and pigment constituting characters and / or figures on the second surface (non-use surface) 11b of the substrate 11. 5 μm) is formed by a screen printing method, and a light shielding layer 12 including a light shielding film 12a and an antioxidant film 12b is formed thereon by a sputtering method. Since the material and form of the substrate 11, the layer structure of the light shielding layer 12, the film material and film thickness of each layer, etc. are all in accordance with the above-described embodiment, redundant description will be omitted.

  The top plate for a cooker of the present invention is suitable as a top plate for an infrared heating cooker, an electromagnetic heating (IH) cooker, or a gas cooker using a radiant heater or a halogen heater.

It is a fragmentary sectional view of the top plate for cookers which concerns on the Example of this invention. It is a fragmentary sectional view of the top plate for cookers concerning other examples of the present invention.

Explanation of symbols

10 Top plate for cooker 11 Substrate 11a First side (use side)
11b 2nd surface (non-use surface)
12 light shielding layer 12a light shielding film 12b antioxidant film

Claims (10)

  A substrate made of low expansion glass, having a first surface facing the outer side of the cooking device and a second surface facing the inner side, and a light shielding layer formed on the second surface of the substrate by sputtering. A top plate for a cooker, wherein the layer includes a light shielding film made of nitrogen-containing Si. The top plate for a cooking appliance according to claim 1, wherein the light shielding film is formed by sputtering Si in an Ar atmosphere containing ₂ to 15% by volume of N ₂ .   The top plate for a cooking appliance according to claim 1, wherein the light shielding layer further includes an antioxidant film.   The top plate for a cooking appliance according to claim 3, wherein the antioxidant film is formed on the light shielding film.   The top plate for a cooking appliance according to claim 3 or 4, wherein the antioxidant film is formed between a surface of the substrate and the light shielding film. The antioxidant film includes one component selected from the following (a) and (b):
(A) is a nitride, carbide or oxynitride of one or more metals selected from the group consisting of Si, Ti, Al, Nb, W, Mo, Ta, and Sn, and (b) The top plate for a cooking appliance according to any one of claims 3 to 5, which is an oxide of one kind of metal selected from the group consisting of Si, Al, and Ti. Si is sputtered in an Ar atmosphere containing ₂ to 15% by volume of N ₂ on the second surface of the substrate made of low expansion glass and having a first surface facing the outside of the cooker and a second surface facing the inside. The manufacturing method of the top plate for cookers which forms the light shielding layer containing the light shielding film which consists of nitrogen-containing Si by doing.   The manufacturing method of the top plate for cookers of Claim 7 which forms an antioxidant film | membrane by a sputtering method on a light shielding film.   The manufacturing method of the top plate for cooking appliances of Claim 7 which forms an antioxidant film | membrane in the 2nd surface of a board | substrate, and forms the said light shielding film on an antioxidant film | membrane. The antioxidant film includes one component selected from the following (a) and (b):
(A) is a nitride, carbide or oxynitride of one or more metals selected from the group consisting of Si, Ti, Al, Nb, W, Mo, Ta, and Sn, and (b) The manufacturing method of the top plate for cooking appliances of Claim 8 or 9 which is an oxide of 1 type of metal chosen from the group which consists of Si, Al, and Ti.

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