JP7177683B2 - top plate for cooker - Google Patents

Description

TECHNICAL FIELD The present invention relates to heat-resistant glass used for cooker top plates, combustion device windows, and the like.

A heat-resistant glass substrate made of crystallized glass or borosilicate glass having a low coefficient of thermal expansion is used for the top plate of cookers such as electromagnetic cookers, radiant heater cookers, and gas cookers. When a transparent glass substrate is used as the glass substrate, in general, a decorative layer or a A light shielding layer is provided.

For example, Patent Literature 1 below discloses heat-resistant glass including a transparent glass substrate and a design layer provided on one main surface of the transparent glass substrate. The pattern of the design layer is a pattern that can be visually recognized from the other main surface side of the transparent glass substrate. The design layer has a first layer in which a sparse area and a dense area are formed corresponding to the pattern. Further, the design layer has a second layer uniformly provided so as to cover the first layer. Moreover, Patent Document 1 describes that the first layer and the second layer preferably have the same color tone. Specifically, it is described that the color difference ΔE between the first layer and the second layer is preferably within the range of 2-20.

WO2017/141519

In recent years, the diversification of colors and designs has progressed in cooker top plates. However, when the heat-resistant glass of Patent Document 1 is used for the top plate for cookers, the heat resistance can be improved, but the formed pattern is still insufficient in terms of design.

An object of the present invention is to provide a heat-resistant glass that can be used for the top plate of a cooker or the like, has heat resistance, and is excellent in design.

A heat-resistant glass according to the present invention includes a transparent glass substrate having a first main surface and a second main surface facing each other; and a second layer provided on the first main surface of the transparent glass substrate so as to cover the first layer, wherein the first layer and the second layer are provided. 2 layers constitute a design layer having a pattern visible from the second main surface side of the transparent glass substrate, and the first layer comprises a dense region, a sparse region, and the and an intermediate region that is more sparse than the dense region, and that is more dense than the sparse region.

In the present invention, it is preferable that the intermediate region is provided at a boundary portion between the dense region and the sparse region.

In the present invention, the dense region is a region provided with the film forming the first layer, and the sparse region is a region not provided with the film forming the first layer. wherein the intermediate region is a region that is made lighter in color than the dense region by partially providing the film that constitutes the first layer, and the dense region and the sparse region It is preferable that the area and the intermediate area are configured corresponding to the pattern.

In the present invention, it is preferable that the L ^{* value of the second layer is larger than the L* value} of the first layer in the L ^* a ^* b ^* color system.

In the present invention, the absolute value of the difference between the L ^* value of the second layer and the L ^* value of the first layer is 2 or more and 99 or less in the L ^* a ^* b ^* color system. is preferred.

In the present invention, the color difference ΔE between the first layer and the second layer is preferably 2 or more and 100 or less in the L ^* a ^* b ^* color system.

In the present invention, on the first main surface of the transparent glass substrate, the area ratio of the sum of the areas of the dense region and the intermediate region to the area of the sparse region ((dense region+intermediate region )/sparse area) is preferably 1 or more and 10 or less.

In the present invention, the pattern may be a hairline pattern.

In the present invention, the pattern may be a wood grain pattern.

In the present invention, it is preferable to further include a coating film provided on the second layer.

A cooker top plate according to the present invention is characterized by being made of heat-resistant glass according to the present invention.

ADVANTAGE OF THE INVENTION According to this invention, the heat-resistant glass which has the heat resistance which can be used for the top plate of a cooker etc., and is excellent in design property can be provided.

1 is a schematic cross-sectional view showing heat-resistant glass according to a first embodiment of the present invention; FIG. FIG. 2 is a schematic plan view showing the first layer in the heat-resistant glass according to the first embodiment of the invention; FIG. 2 is a schematic plan view showing an enlarged first layer of the heat-resistant glass according to the first embodiment of the present invention; FIG. 4A is a schematic plan view showing a modification of the first layer in the heat-resistant glass according to the first embodiment of the present invention; FIG. 4 is a schematic plan view showing a screen mesh used when forming an intermediate region of the first layer in the heat-resistant glass according to the first embodiment of the present invention; FIG. 3 is a schematic cross-sectional view showing heat-resistant glass according to a second embodiment of the present invention; FIG. 5 is a schematic cross-sectional view showing heat-resistant glass according to a third embodiment of the present invention;

Preferred embodiments are described below. However, the following embodiments are merely examples, and the present invention is not limited to the following embodiments. Also, in each drawing, members having substantially the same function may be referred to by the same reference numerals.

(First Embodiment of Heat Resistant Glass)
FIG. 1 is a schematic cross-sectional view showing heat-resistant glass according to a first embodiment of the present invention. As shown in FIG. 1, the heat-resistant glass 1 includes a transparent glass substrate 2 (hereinafter referred to as "transparent glass substrate 2"). In this embodiment, the transparent glass substrate 2 is colorless and transparent. Of course, the transparent glass substrate 2 may be colored and transparent, but from the viewpoint of further enhancing the aesthetic appearance of the heat-resistant glass 1, it is preferably colorless and transparent. In this specification, the term “transparent” means that the light transmittance in the visible wavelength range is 70% or more at a wavelength of 450 nm to 700 nm.

For example, when the heat-resistant glass 1 is used for the top plate of a cooker, heating and cooling may be repeated. Therefore, the transparent glass substrate 2 preferably has high heat resistance and a low coefficient of thermal expansion. Specifically, the softening temperature of the transparent glass substrate 2 is preferably 700° C. or higher, more preferably 750° C. or higher. Further, the average coefficient of linear thermal expansion of the transparent glass substrate 2 at 30° C. to 750° C. is preferably within the range of −10×10 ⁻⁷ /° C. to +60×10 ⁻⁷ /° C., and −10×10 ⁻ It is more preferably in the range of ⁷ /°C to +50×10 ^-7 /°C, and even more preferably in the range of -10×10 ^-7 /°C to +40×10 ^-7 /°C. Therefore, the transparent glass substrate 2 is preferably made of low-expansion glass or low-expansion crystallized glass having a high glass transition temperature. A specific example of the low-expansion crystallized glass is "N-0" manufactured by Nippon Electric Glass Co., Ltd. Borosilicate glass or the like may be used as the transparent glass substrate 2 .

The thickness of the transparent glass substrate 2 is not particularly limited. The thickness of the transparent glass substrate 2 can be appropriately set according to the light transmittance and the like. The thickness of the transparent glass substrate 2 can be, for example, about 2 mm to 6 mm.

The transparent glass substrate 2 has a first major surface 2a and a second major surface 2b facing each other. A design layer 3 is provided on the first main surface 2 a of the transparent glass substrate 2 . The design layer 3 has a first layer 4 and a second layer 5 . More specifically, the first layer 4 is provided on the first main surface 2a of the transparent glass substrate 2. As shown in FIG. A second layer 5 is provided on the first main surface 2 a of the transparent glass substrate 2 so as to cover the first layer 4 . Thereby, the design layer 3 is formed on the transparent glass substrate 2 .

The pattern of the design layer 3 is a pattern that can be visually recognized from the second main surface 2 b side of the transparent glass substrate 2 . In this embodiment, the pattern of the design layer 3 is a hairline pattern. A hairline pattern is a pattern observed on the surface of a stainless steel (SUS) plate. The pattern of the design layer 3 may be a wood grain pattern, and is not particularly limited.

FIG. 2 is a schematic plan view showing the first layer in the heat-resistant glass according to the first embodiment of the invention. Moreover, FIG. 3 is a schematic plan view showing an enlarged first layer of the heat-resistant glass according to the first embodiment of the present invention. 2 and 3 are schematic plan views of the first layer 4 viewed from the second main surface 2b side of the transparent glass substrate 2. FIG.

As shown in FIG. 3 , in the first layer 4 , dense regions 4 a , sparse regions 4 b , and intermediate regions 4 c are configured corresponding to the hairline pattern of the design layer 3 .

The dense region 4a is a region where the film forming the first layer 4 is provided. In the dense region 4 a , the thickness of the film may be substantially uniform, or may vary according to the pattern of the design layer 3 . The thickness of the film in the dense region 4a is not particularly limited, but is preferably 1 μm or more, more preferably 3 μm or more, and preferably 10 μm or less, more preferably 7 μm or less. When the thickness of the film in the dense region 4a is within the above range, the pattern can be made more excellent in design. In addition, the width of the dense region 4a is not particularly limited when the direction orthogonal to the hairline extending direction and the thickness direction is taken as the width direction, but is preferably 0.001 mm or more, more preferably 0.15 mm or more. , preferably 5 mm or less, more preferably 2.5 mm or less. When the width of the dense region 4a is within the above range, the film can be more excellent in design.

On the other hand, the sparse region 4b is a region where the film forming the first layer 4 is substantially not provided. In this specification, "substantially not provided" means that the area ratio of the film constituting the first layer 4 to the entire area of the sparse region 4b is less than 10%. .

The intermediate region 4c is a region provided at the boundary between the dense region 4a and the sparse region 4b. The intermediate region 4c may be provided so as to include the entire boundary portion between the dense region 4a and the sparse region 4b, or may be provided so as to include a portion of the boundary portion. In addition, the film forming the first layer 4 is partially provided in the intermediate region 4c. In the intermediate region 4c, the film forming the first layer 4 is partially provided, so that the intermediate region 4c is more sparse than the dense region 4a and more dense than the sparse region 4b. As a result, the middle region 4c has a lighter color tone than the dense region 4a.

In the intermediate region 4c, the area ratio of the portion provided with the film constituting the first layer 4 is preferably 10% or more, more preferably 60% or more, and preferably 90% or less, more preferably 85%. % or less. When the area ratio of the portion provided with the film constituting the first layer 4 is within the above range, the pattern can be made more excellent in design.

The thickness of the film in the intermediate region 4c may be the same as or different from that in the dense region 4a. In the intermediate region 4 c , the thickness of the film may be substantially uniform, or may vary according to the pattern of the design layer 3 . Further, in the intermediate region 4c, by making the film thinner than the dense region 4a, the film may be made more sparse than the dense region 4a and denser than the sparse region 4b, thereby making the color lighter. The thickness of the film in the intermediate region 4c is not particularly limited, but is preferably 1 μm or more, more preferably 3 μm or more, and preferably 7 μm or less, more preferably 5 μm or less. When the thickness of the film in the intermediate region 4c is within the above range, the pattern can be made more excellent in design. In addition, the width of the intermediate region 4c is not particularly limited when the direction perpendicular to the hairline extending direction and the thickness direction is taken as the width direction, but is preferably 0.05 mm or more, more preferably 0.3 mm or more, It is preferably 5 mm or less, more preferably 2.5 mm or less. When the width of the intermediate region 4c is within the above range, the pattern can be made more excellent in design.

In the first main surface 2a of the transparent glass substrate 2, the area ratio of the sum of the areas of the dense region 4a and the intermediate region 4c to the area of the sparse region 4b ((dense region 4a+intermediate region 4c)/sparse Region 4b) is not particularly limited, but is preferably 1 or more, more preferably 2 or more, and preferably 10 or less, more preferably 9 or less. When the area ratio is within the above range, the pattern can be made more excellent in design.

Moreover, as shown in FIG. 1, the second layer 5 is provided continuously and uniformly so as to cover the entire first layer 4 . The second layer 5 can be composed of, for example, a solid coating film. Note that the film forming the first layer 4 is not provided in the sparse region 4b of the first layer 4 as described above. Therefore, in this region, the second layer 5 can be seen when viewed from the second principal surface 2b side of the transparent glass substrate 2 .

The thickness of the second layer 5 is not particularly limited, but is preferably 1 μm or more, more preferably 3 μm or more, and preferably 10 μm or less, more preferably 7 μm or less. When the thickness of the second layer 5 is within the above range, the pattern can be made more excellent in design.

Thus, in the present embodiment, the first layer 4 has the dense region 4a, the sparse region 4b, and the intermediate region 4c, and the first layer 4 is covered with the first layer 4. The design layer 3 is configured by providing two layers 5 . In the design layer 3, particularly in the boundary portion between the dense region 4a and the sparse region 4b that constitute the first layer 4, the density is more sparse than the dense region 4a and more dense than the sparse region 4b, An intermediate region 4c having a lighter color is provided. Therefore, the hairline pattern drawn by the dense area 4a can be seen three-dimensionally, and the pattern can be excellent in design.

In the present embodiment, the color of the coating film forming the first layer 4 is not particularly limited, but black or gray is preferable. Moreover, it is preferable that the dense area 4a and the intermediate area 4c are made of the same color coating film. On the other hand, the color of the coating film forming the second layer 5 is preferably paler and brighter than that of the first layer 4 . In this case, the pattern can be made more excellent in terms of design. The color of the coating film forming the second layer 5 can be, for example, white or cream.

Further, in the L ^* a ^* _b ^* color system, when the L ^* value of the first layer 4 is Lα and the L ^* value of the second layer 5 is _Lβ , _Lβ and _Lα is preferably 2 or more and ₉₉ or _less , more preferably 10 or more and 90 or less. When the absolute value of the difference |L _β −L _α | is within the above range, the second layer 5 can be made brighter than the first layer 4, and the pattern can be more excellent in design. can be done. Note that L _β is preferably 50 or more, and L _α is preferably 50 or less. In addition, L _α is the L ^* value measured from the first layer 4 side with a color difference meter after forming only the solid coating film of the first layer 4 on the first main surface 2a of the transparent glass substrate 2. is. L _β is the L ^* value measured from the second layer 5 side with a color difference meter after forming only the solid coating film of the second layer 5 on the first main surface 2a of the transparent glass substrate 2. .

In addition, in the L ^* a ^* b ^* color system, the color difference ΔE between the first layer 4 and the second layer 5 is preferably 2 or more and 100 or less, more preferably 10 or more and 90 or less. preferable. When the color difference ΔE is within the above range, the pattern can be made more excellent in design.

The above color difference ΔE is a color difference in the L ^* a ^* b ^* color system, and can be obtained from the following formula (1).

ΔE=((L _α −L _β ) ² +(a _α −a _β ) ² +(b _α −b _β ) ² ) ^0.5 Equation (1)

L _α, a _{α, and} b _α are measured by forming only a solid coating film of the first layer 4 on the first main surface 2a of the transparent glass substrate 2 and measuring from the first layer 4 side with a color difference meter. is the L ^* a ^* b ^* value. L _β, a _{β, and} b _β are measured by forming only a solid coating film of the second layer 5 on the first main surface 2 a of the transparent glass substrate 2 and measuring from the second layer 5 side with a color difference meter. is the L ^* a ^* b ^* value.

Note that L ^* means "brightness index" (L axis = 0 to 100), a ^* and b ^* mean "chromatic neck index" (a axis = -60 to +60, b axis = -60 to +60). .

In the present embodiment, the pattern of the design layer 3 is a hairline pattern, but it may be a wood grain pattern and is not particularly limited. As shown in a modified example in FIG. 4, it may be a pattern such as a character or a figure. In the modified example of FIG. 4, characters and figures are drawn in a dense area 4a, and their shadows are drawn in an intermediate area 4c that is lighter in color than the dense area 4a. As a result, the pattern of the design layer 3 can be made three-dimensional, and the pattern can be excellent in design.

The first layer 4 and the second layer 5 can be made of, for example, transparent heat-resistant resin and color pigment. However, the first layer 4 and the second layer 5 may be composed of glass such as glass frit and a color pigment. Both the first layer 4 and the second layer 5 may be composed of a transparent heat-resistant resin and a color pigment, and both the first layer 4 and the second layer 5 may be composed of glass and a color pigment. may be Alternatively, the first layer 4 may be composed of a transparent heat-resistant resin and a color pigment, and the second layer 5 may be composed of glass and a color pigment. The first layer 4 may be composed of glass and a color pigment, and the second layer 5 may be composed of a transparent heat-resistant resin and a color pigment. In particular, when the pattern of the design layer 3 is a hairline pattern, both the first layer 4 and the second layer 5 are made of a transparent heat-resistant resin and a color pigment from the viewpoint of making the pattern more excellent in design. preferably configured. Further, as described above, the second layer 5 preferably has a lighter and brighter color than the first layer 4. Therefore, the color pigments contained in the first layer 4 and the second layer 5 have different colors. Pigments are preferred.

Coloring pigments used in the first layer 4 and the second layer 5 are not particularly limited as long as they are colored inorganic substances. Coloring pigments include, for example, white pigment powder such as TiO ₂ powder, ZrO ₂ powder or ZrSiO ₄ powder, blue inorganic pigment powder containing Co, green inorganic pigment powder containing Co, Ti-Sb-Cr-based or Examples include a Ti—Ni based yellow inorganic pigment powder, a Co—Si based red inorganic pigment powder, a brown inorganic pigment powder containing Fe, and a black inorganic pigment powder containing Cu.

Specific examples of blue inorganic pigment powders containing Co include, for example, Co--Al-based or Co--Al--Ti-based inorganic pigment powders. A specific example of the Co—Al-based inorganic pigment powder is CoAl ₂ O ₄ powder. A specific example of the Co—Al—Ti-based inorganic pigment powder is CoAl ₂ O ₄ —TiO ₂ —Li ₂ O powder.

Specific examples of green inorganic pigment powders containing Co include Co--Al--Cr-based or Co--Ni--Ti--Zn-based inorganic pigment powders. A specific example of the Co--Al--Cr inorganic pigment powder is Co(Al, Cr) ₂ O ₄ powder. Specific examples of the Co—Ni—Ti—Zn-based inorganic pigment powder include (Co, Ni, Zn) ₂ TiO ₄ powder.

Specific examples of brown inorganic pigment powders containing Fe include, for example, Fe—Zn-based inorganic pigment powders. Specific examples of the Fe—Zn based inorganic pigment powder include (Zn, Fe) Fe ₂ O ₄ powder.

Specific examples of black inorganic pigment powders containing Cu include Cu—Cr inorganic pigment powders and Cu—Fe inorganic pigment powders. Specific examples of the Cu--Cr inorganic pigment powder include Cu(Cr, Mn) ₂ O ₄ powder and Cu--Cr--Mn powder. Further, specific examples of the Cu--Fe-based inorganic pigment powder include Cu--Fe--Mn powder.

One of these color pigments may be used alone, or two or more of them may be used in combination.

The heat-resistant resin used for the first layer 4 and the second layer 5 is preferably a transparent resin. In particular, it is preferable that the light transmittance in the visible wavelength region at wavelengths of 450 nm to 700 nm is 80% or more. The heat-resistant resin used for the first layer 4 and the second layer 5 is not particularly limited, and for example, silicone resin, polyimide resin, or the like can be used. Among them, a silicone resin having at least one of a methyl group and a phenyl group as a functional group directly bonded to a silicon atom is preferable. In this case, the heat resistance of the heat-resistant glass 1 can be further enhanced.

One of these heat-resistant resins may be used alone, or two or more of them may be used in combination. Also, other resins than those described above may be included.

When the first layer 4 and the second layer 5 are made of heat-resistant resin, it is desirable to use the same resin from the viewpoint of further increasing productivity, but different resins may be used.

When the first layer 4 and the second layer 5 are made of glass, the glass component includes, for example, borosilicate glass, and at least one of an alkali metal component and an alkaline earth metal component. Silicate glass, phosphate glass containing zinc and aluminum, and the like can be used. Further, the form of the glass is preferably scale-like, powder-like, or the like.

In the present embodiment, the content of the color pigment contained in the first layer 4 is preferably 5% by mass or more, more preferably 10% by mass or more, and preferably 35% by mass or less, more preferably 30% by mass. % or less. When the content of the color pigment contained in the first layer 4 is equal to or higher than the above lower limit, the pattern can be made more excellent in design. Moreover, when the content of the coloring pigment is equal to or less than the above upper limit, the heat resistance and impact resistance of the heat-resistant glass 1 can be further enhanced. The content of the coloring pigment contained in the first layer 4 is the content when the entire material constituting the first layer 4 is taken as 100% by mass.

The content of the color pigment contained in the second layer 5 is preferably 5% by mass or more, more preferably 10% by mass or more, and preferably 35% by mass or less, more preferably 30% by mass or less. When the content of the color pigment contained in the second layer 5 is equal to or higher than the above lower limit, a pattern with even better design properties can be obtained. Moreover, when the content of the coloring pigment in the second layer 5 is equal to or less than the above upper limit, the heat resistance and impact resistance of the heat-resistant glass 1 can be further enhanced. In addition, the content of the color pigment is the content when the entire material constituting the second layer 5 is taken as 100% by mass.

The content of the heat-resistant resin and glass in the first layer 4 and the second layer 5 is not particularly limited, but is preferably 65% by mass or more, more preferably 70% by mass or more, and preferably 95% by mass. % or less, more preferably 90 mass % or less. When the contents of the heat-resistant resin and glass are equal to or higher than the above lower limit values, the heat resistance and impact resistance of the heat-resistant glass 1 can be further enhanced. Moreover, when the contents of the heat-resistant resin and the glass are equal to or less than the above upper limits, the mechanical strength of the heat-resistant glass 1 can be further enhanced. The content of the heat-resistant resin and glass is the content when the entire materials constituting the first layer 4 and the second layer 5 are each taken as 100% by mass.

Each of the first layer 4 and the second layer 5 may further contain an extender. Extender pigments are inorganic pigment powders that are different from colored pigments. Examples of extender pigments that can be used include, but are not limited to, talc and mica. These extender pigments may be used individually by 1 type, and may use multiple types together. When the first layer 4 and the second layer 5 contain an extender, the mechanical strength of the heat-resistant glass 1 can be further enhanced.

The content of the extender in the first layer 4 and the second layer 5 is not particularly limited, but is preferably 1% by mass or more, more preferably 10% by mass or more, and preferably 35% by mass or less. More preferably, it is 40% by mass or less. When the content of the extender pigment is at least the above lower limit, the mechanical strength of the heat-resistant glass 1 can be further enhanced. Moreover, when the content of the extender pigment is equal to or less than the above upper limit, the heat resistance and impact resistance of the heat-resistant glass 1 can be further enhanced. In addition, the content of the extender is the content when the entire materials constituting the first layer 4 and the second layer 5 are assumed to be 100% by mass, respectively.

As shown in FIG. 1, a solid first coating 6 is provided on the second layer 5 . Further, a solid second coating 7 is provided on the first coating 6 . In this embodiment, the first coating film 6 is a white coating film, and the second coating film 7 is a gray coating film. By providing the first coating film 6 and the second coating film 7, for example, when the heat-resistant glass 1 is used as a cooker top plate, it is possible to further enhance the concealability of the internal structure of the cooker.

Each of the first coating film 6 and the second coating film 7 has a thickness of preferably 2 μm or more, more preferably 3 μm or more, and preferably 15 μm or less, more preferably 10 μm or less. When the thicknesses of the first coating film 6 and the second coating film 7 are each equal to or greater than the above lower limit values, the concealability of the internal structure of the cooker can be further enhanced. On the other hand, when the thickness of each of the first coating film 6 and the second coating film 7 is equal to or less than the above upper limit value, peeling of the coating film due to the difference in coefficient of thermal expansion with the design layer 3 should be made more difficult to occur. can be done.

The first coating film 6 and the second coating film 7 are coating films provided to further enhance the concealability of the internal structure of the cooker when the heat-resistant glass 1 is used, for example, as a top plate for a cooker. Therefore, the first coating film 6 and the second coating film 7 can be, for example, light shielding films. Preferably, the first coating 6 and the second coating 7 also contain colored pigments. The first coating film 6 and the second coating film 7 may contain the same color pigment or may contain different color pigments. As for the coloring pigment, the coloring pigments described in the sections of the first layer 4 and the second layer 5 can be appropriately used in consideration of the concealability of the internal structure of the cooker.

The first coating film 6 and the second coating film 7 may be made of, for example, a heat-resistant resin, or may be made of glass. Both the first coating film 6 and the second coating film 7 may be made of heat-resistant resin, or both may be made of glass. One of the first coating film 6 and the second coating film 7 may be made of heat-resistant resin, and the other may be made of glass. As the heat-resistant resin and glass, those described in the sections of the first layer 4 and the second layer 5 can be appropriately used.

The content of the coloring pigment used in the first coating 6 and the second coating 7 is preferably 20% by weight or more, more preferably 30% by weight or more, and preferably 80% by weight or less, and more Preferably, it is 70% by weight or less. When the contents of the color pigments used in the first coating film 6 and the second coating film 7 are each equal to or higher than the above lower limit values, the concealability of the internal structure of the cooker can be further enhanced. In addition, when the content of the color pigment used in the first coating film 6 and the second coating film 7 is equal to or less than the above upper limit value, the adhesion to the design layer 3 can be further enhanced. Moreover, the first coating film 6 and the second coating film 7 may further contain an extender. As the extender pigment, those described in the sections of the first layer 4 and the second layer 5 can be appropriately used.

(Method for producing heat-resistant glass)
The heat-resistant glass 1 can be manufactured, for example, by the following manufacturing method.

First, a first layer-forming paste containing a transparent heat-resistant resin, color pigment powder, and a solvent is prepared. The first layer 4 is formed by applying the prepared first layer forming paste onto the first main surface 2a of the transparent glass substrate 2 and drying it. The method of applying the paste is not particularly limited, and for example, a screen printing method can be used.

In screen printing, the dense areas 4a and the intermediate areas 4c that make up the first layer 4 can be formed using a printed pattern with, for example, 180 lines per inch. In addition, the intermediate region 4c can be formed by printing using the screen mesh 8 shown in FIG. 5, for example.

The screen mesh 8 is partially masked with the photosensitive material 9 to form a first layer formed portion 4A and a first layer non-formed portion 4B. The first layer forming portion 4A corresponds to the portion where the mesh is not masked by the photosensitive material 9. As shown in FIG. The first layer non-formation portion 4B corresponds to the portion where the mesh is masked by the photosensitive material 9. FIG.

In the present embodiment, adjacent openings of the screen mesh 8 are alternately masked to form the first layer formed portion 4A and the first layer non-formed portion 4B. Therefore, by performing screen printing using this screen mesh 8, the portions where the first layer 4 is formed and the portions where it is not formed can be evenly arranged. By evenly arranging the portions where the first layer 4 is formed and the portions where it is not formed, color unevenness in the intermediate region 4c can be further suppressed. Therefore, it is preferable to use the screen mesh 8 capable of arranging the portions where the first layer 4 is formed and the portions where the first layer 4 is not formed as evenly as possible, as in this embodiment.

In addition, it is preferable to print so that the ratio of the part in which the 1st layer 4 is formed with respect to the area of the whole intermediate region 4c may be 10% or more and 90% or less. In this case, the pattern of the design layer 3 can be made more three-dimensional, and the pattern can be made more excellent in design.

Next, a second layer-forming paste containing a transparent heat-resistant resin, a color pigment powder, and a solvent is prepared. The prepared second layer forming paste is applied so as to cover the first layer 4 and dried to form the second layer 5 . The method of applying the paste is not particularly limited, and for example, a screen printing method can be used. Unlike the first layer 4, the second layer 5 is applied continuously and uniformly to form a solid coating film.

The paste application speed and viscosity when forming the first layer 4 and the second layer 5 can be appropriately set according to the content of the color pigment in each layer. For example, when the content of the color pigment in each layer is large, it is preferable to lower the viscosity of the heat-resistant resin and slow down the coating speed of the heat-resistant resin.

The paste drying temperature for forming the first layer 4 and the second layer 5 can be, for example, a temperature of 50° C. or higher and 100° C. or lower. The drying time can be, for example, 10 minutes or more and 10 hours or less.

In addition, the laminate in which the first layer 4 and the second layer 5 are formed may be further fired. However, the first layer 4 and the second layer 5 may be fired separately.

The method of forming the first coating film 6 and the second coating film 7 is not particularly limited. For example, a paste containing a heat-resistant resin, a color pigment powder, and a solvent is applied and dried. be able to. Also in this case, screen printing can be used as the method of applying the paste. In addition, from the viewpoint of further enhancing the concealability of the internal structure of the cooker, the first coating film 6 and the second coating film 7 may also be applied continuously and uniformly to form a solid coating film. preferable.

Note that the layered product on which the first coating film 6 and the second coating film 7 are formed may be further fired. The first coating 6 and the second coating 7 may be fired separately. Alternatively, the first layer 4 and the second layer 5 may be fired at the same time. Although the firing temperature in each step is not particularly limited, it is preferably 700° C. or higher, more preferably 800° C. or higher. Also, the firing temperature is preferably 900° C. or lower, more preferably 850° C. or lower.

The heat-resistant glass 1 can be manufactured as described above.

[Second Embodiment and Third Embodiment]
FIG. 6 is a schematic cross-sectional view showing heat-resistant glass according to a second embodiment of the present invention. In the second embodiment, a hairline pattern having a darker color than the hairline pattern of the heat-resistant glass 1 is formed. Therefore, as shown in FIG. 6, in the heat-resistant glass 21, the first coating film 6 and the second coating film 7 are not provided, and only the coating film 10 is provided on the design layer 3. As shown in FIG. Thereby, the workability in manufacturing the heat-resistant glass 21 can be further improved as compared with the case of forming the first coating film 6 and the second coating film 7 . When only one layer of the coating 10 is provided on the design layer 3, it is preferable to use a dark-colored coating such as black. However, the color of the coating film 10 is not particularly limited, and can be appropriately selected in consideration of the ability to conceal the inside of the cooker. Other points are the same as in the first embodiment.

Moreover, FIG. 7 is a schematic cross-sectional view showing a heat-resistant glass according to a third embodiment of the present invention. In the third embodiment, a hairline pattern having a darker color than the hairline pattern of the heat-resistant glass 21 is provided. Therefore, as shown in FIG. 7, in the heat-resistant glass 31, no coating is provided on the design layer 3, and the surface of the design layer 3 is exposed to the outside air. Other points are the same as in the first embodiment.

As shown in the second and third embodiments, only one layer of coating may be provided on the design layer 3, or no coating may be provided. For example, when the heat-resistant glass 1 is used for a cooker top plate, it can be appropriately selected in consideration of the ability to conceal the inside of the cooker.

Also in the second and third embodiments, the first layer 4 has a dense region 4a, a sparse region 4b, and an intermediate region 4c. The design layer 3 is configured by providing the second layer 5 so as to cover it. In the design layer 3, particularly in the boundary portion between the dense region 4a and the sparse region 4b that constitute the first layer 4, the density is more sparse than the dense region 4a and more dense than the sparse region 4b, An intermediate region 4c having a lighter color is provided. Therefore, the hairline pattern drawn by the dense area 4a can be made to look three-dimensional, and the pattern can be made more excellent in design.

The heat-resistant glass described in the first to third embodiments has heat resistance that can be used for the top plate of a cooker, etc., and is also excellent in design. Therefore, the heat-resistant glass of the present invention can be suitably used for the top plate of cookers. However, the heat-resistant glass of the present invention is not limited to such applications, and can be used, for example, as window glass for combustion devices such as stoves and fireplaces.

Reference Signs List 1, 21, 31 Heat-resistant glass 2 Transparent glass substrate 2a First principal surface 2b Second principal surface 3 Design layer 4 First layer 4a Dense region 4b Sparse region 4c Intermediate Area 4A First layer formed portion 4B First layer non-formed portion 5 Second layer 6 First coating film 7 Second coating film 8 Screen mesh 9 Photosensitive material 10 Coating film

Claims (8)

a transparent glass substrate having first and second major surfaces facing each other;
a first layer provided on the first main surface of the transparent glass substrate;
a second layer provided on the first main surface of the transparent glass substrate so as to cover the first layer;
with
wherein the first layer and the second layer are respectively composed of a transparent heat-resistant resin and a color pigment;
The first layer and the second layer constitute a design layer having a pattern visible from the second main surface side of the transparent glass substrate,
The first layer is
dense areas and
sparse regions and
an intermediate region that is more sparse than the dense region and denser than the sparse region;
has
the intermediate region is provided at a boundary portion between the dense region and the sparse region;
the dense region is a region provided with a film forming the first layer;
the sparse region is a region where the film constituting the first layer is not provided;
The intermediate region is a region that is made lighter in color than the dense region by partially providing the film that constitutes the first layer, and the dense region, the sparse region, and A cooker top plate , wherein the intermediate region is configured to correspond to the pattern . 2. The cooker top plate according to claim 1 , wherein the L ^{* value of said second layer is greater than the L* value} of said first layer in the L ^* a ^* b ^* color system. The absolute value of the difference between the L ^* value of the second layer and the L ^* value of the first layer is 2 or more and 99 or less in the L ^* a ^* b ^* color system. 3. The cooker top plate according to 2. The cooker according to any one of claims 1 to 3 , wherein the color difference ΔE between the first layer and the second layer is 2 or more and 100 or less in the L ^* a ^* b ^* color system. top plate . In the first main surface of the transparent glass substrate, the area ratio of the sum of the areas of the dense region and the intermediate region to the area of the sparse region ((dense region + intermediate region)/sparse region ) is 1 or more and 10 or less . The cooker top plate according to any one of claims 1 to 5 , wherein the pattern is a hairline pattern. The cooker top plate according to any one of claims 1 to 5 , wherein the pattern is a wood grain pattern. The cooker top plate according to any one of claims 1 to 7 , further comprising a coating provided on said second layer.

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