[Technical Field]
[0001] The present invention relates to top plates for cooking devices.
[Background Art]
[0002] A low-expansion crystallized glass plate has been conventionally used as a top plate
for a cooking device, such as an electromagnetic cooking device, a radiant heater
cooking device or a gas cooking device. Furthermore, a coating film is provided on
a surface of the glass plate located on a cooking surface side for the purpose of
preventing slip of cooking utensils thereon and preventing scrapes on the glass plate
due to friction of cooking utensils thereagainst.
[0003] For example,
JP 2003 168548 A,
JP 2007 005318 A and
JP 2014 037926 A disclose top plates for cooking devices in which a coating film, such as a printed
layer or a decorated layer, is provided on a cooking surface of a plate formed of
a low-expansion crystallized glass substrate. In
JP 2003 168548 A,
JP 2007 005318 A and
JP 2014 037926 A, the coating film is described as being made of glass and inorganic pigment. In addition,
in
JP 2003 168548 A, the coating film is described as being formed on the whole or part of the cooking
surface of the top plate.
[0004] EP 1 887 613 A1 and
EP 1 267 593 A also describe disclose top plates for cooking devices in which a coating film, such
as a printed layer or a decorated layer, is provided on a cooking surface of a plate
formed of a crystallized glass substrate, wherein the coating film is made of glass
and inorganic pigment.
JP 2003 302061 A discloses a cooker having a top plate and a heating means and a light emitting means
installed under the top plate, wherein a translucent coating comprising glass as a
main component is applied onto the upper surface of the top plate.
[Summary of Invention]
[Technical Problem]
[0005] However, the coating films disclosed in
JP 2003 168548 A,
JP 2007 005318 A and
JP 2014 037926 A have a problem that, because of their low denseness, if cooking water or the like
boils over, the cooking water or the like may seep into the coating films, so that
the coating films get dirty. Furthermore, the coating films also have a problem that
because the resistance at the friction of cooking utensils thereagainst is likely
to become large, the coating films may suffer scrapes or may be peeled, resulting
in impairment of the design of the top plate and failure to sufficiently reduce the
slip of cooking utensils.
[0006] An object of the present invention is to provide a top plate for a cooking device
capable of preventing cooking water or the like from seeping into the coating film,
having an excellent design, and capable of reducing the slip of cooking utensils.
[Solution to Problem]
[0007] The present invention provides a top plate according to claim 1. A top plate for
a cooking device according to the present invention includes: a glass substrate that
has a cooking surface on which a cooking utensil is to be placed and a back surface
located on a side opposite to the cooking surface; and a first coating film provided
on the cooking surface and having a pattern, wherein the first coating film is made
only of glass and is substantially free of any inorganic pigment.
[0008] In the present invention, the pattern is a pattern having a portion where a film
is formed and a portion where no film is formed. Examples of the pattern include,
for example, dotted patterns, lattice patterns, geometric patterns, patchy patterns,
irregular patterns, and linear patterns.
[0009] In the top plate for a cooking device according to the present invention, the glass
substrate is transparent. In this case, the top plate further includes a second coating
film provided on the back surface of the glass substrate.
[0010] Alternatively, in the top plate for a cooking device according to the present invention,
the glass substrate is a deeply colored crystallized glass plate.
[Advantageous Effects of Invention]
[0011] According to the present invention, a top plate for a cooking device can be provided
which can prevent cooking water or the like from seeping into the coating film, has
an excellent design, and can reduce the slip of cooking utensils.
[Brief Description of Drawings]
[0012]
[Fig. 1]
Fig. 1 is a schematic cross-sectional view showing a top plate for a cooking device
according to one embodiment of the present invention.
[Fig. 2]
Fig. 2 is a schematic plan view showing a first coating film in the top plate for
a cooking device according to the one embodiment of the present invention when viewed
from a direction perpendicular to a cooking surface.
[Fig. 3]
Fig. 3 is a graph showing results of evaluation on smoothness of a first coating film
of a top plate for a cooking device obtained in Example 1.
[Fig. 4]
Fig. 4 is a graph showing results of evaluation on smoothness of a first coating film
of a top plate for a cooking device obtained in Comparative Example 1.
[Description of Embodiments]
[0013] Hereinafter, a description will be given of a preferred embodiment. However, the
following embodiment is merely illustrative and the present invention is not limited
to the following embodiment. Throughout the drawings, members having substantially
the same functions may be referred to by the same reference characters.
[0014] Fig. 1 is a schematic cross-sectional view showing a top plate for a cooking device
according to one embodiment of the present invention. A top plate 1 for a cooking
device includes a glass substrate 10. The glass substrate 10 has a cooking surface
11 and a back surface 12. The cooking surface 11 is a surface on which a cooking utensil,
such as a pot or a frying pan, is to be placed. On the other hand, the back surface
12 is a surface located toward the inside of the cooking device.
[0015] Heating and cooling are repeatedly applied to the top plate 1 for a cooking device.
Therefore, the glass substrate 10 preferably has excellent thermal resistance and
a low coefficient of thermal expansion. Specifically, the softening point of the glass
substrate 10 is preferably 700°C or more and more preferably 750°C or more. Furthermore,
the average coefficient of linear thermal expansion of the glass substrate 10 at 30°C
to 750°C is preferably within the range of -10×10
-7/°C to +30×10
-7/°C and more preferably -10×10
-7/°C to +20×10
-7/°C. Therefore, the glass substrate 10 is preferably a glass, a crystallized glass
or a tempered glass that have a high glass transition temperature and a low coefficient
of thermal expansion.
[0016] In this embodiment, the glass substrate 10 is made of a low-expansion crystallized
glass. Specific examples of the low-expansion crystallized glass include a crystallized
glass N-0 manufactured by Nippon Electric Glass Co., Ltd., for example. Although in
this embodiment a transparent glass capable of transmitting light in the visible wavelength
range is used as the glass substrate 10, the glass substrate 10 may be a low-expansion
crystallized glass having a low light transmittance in the visible wavelength range
as will be described later and examples thereof include crystallized glasses GC-190
and N-11 manufactured by Nippon Electric Glass Co., Ltd., for example.
[0017] A first coating film 20 is provided on the cooking surface 11 of the glass substrate
10. The first coating film 20 is a printed layer of a pattern having discrete portions.
The first coating film 20 is a patterned layer for giving a design using a pattern.
The provision of the first coating film 20 enables prevention of scrapes on the cooking
surface 11 and reduction of the slip of cooking utensils thereon.
[0018] Fig. 2 is a schematic plan view showing the first coating film 20 in the top plate
for a cooking device according to the one embodiment of the present invention when
viewed from a direction perpendicular to the cooking surface. As shown in Fig. 2,
in this embodiment, a dotted pattern is provided as the first coating film 20. However,
in the present invention, any pattern other than dotted patterns may be used as the
pattern. Examples of the patterns other than dotted patterns that can be used include,
for example, lattice patterns, geometric patterns, patchy patterns, irregular patterns,
and linear patterns.
[0019] When the shape of the first coating film 20 is approximately circular as viewed from
the cooking surface 11 side, the size of the pattern of the first coating film 20
preferably has a diameter in the range of 0.5 to 5 mm. When the shape of the first
coating film 20 is rectangular, each side of the coating film 20 preferably has a
length in the range of 0.2 to 4 mm. Furthermore, when the shape of the first coating
film 20 is a latticed shape or a linear shape, the lines constituting the lattice
or the lines of the linear pattern preferably have a width in the range of 0.2 to
5.0 mm. For the other shapes, it is sufficient that they have an appropriate size
to provide the same effects as the above shapes.
[0020] The first coating film 20 is made only of glass. The phrase "made only of glass"
in the present invention means that it is made substantially only of glass. In other
words, the first coating film 20 is substantially free of any inorganic pigment. Therefore,
the first coating film 20 may contain any components other than any inorganic pigment
so far as it can exert the effects of the present invention. Furthermore, it may contain
a trace of inorganic pigment so far as it can exert the effects of the present invention.
[0021] As thus far described, since in this embodiment the first coating film 20 is made
of glass powder and contains no inorganic pigment, the first coating film 20 is clear
and colorless. Therefore, even if the first coating film 20 suffers scrapes, the scrapes
are unnoticeable, so that the design is less likely to be impaired. Hence, the top
plate 1 for a cooking device has an excellent design.
[0022] Furthermore, when the first coating film 20 is made only of glass, it becomes a dense
film as compared with when an inorganic pigment is added thereto. Therefore, it is
less likely that the top plate 1 for a cooking device gets dirty due to seeping of
cooking water or the like thereinto.
[0023] Moreover, because the surface of the first coating film 20 is smooth as compared
with the case where an inorganic pigment is added thereto, it can be prevented that
the resistance becomes too large when a cooking utensil scrapes against the first
coating film 20, thus preventing peeling of the coating film.
[0024] From the viewpoint of more effectively reducing dirt due to cooking water or the
like, the arithmetic mean roughness (Ra) of the first coating film 20 is preferably
not more than 1.0 µm and more preferably not more than 0.4 µm. Furthermore, the thickness
of the first coating film 20 is preferably not more than 10 µm and more preferably
not more than 6 µm.
[0025] On the other hand, from the viewpoint of more effectively reducing the slip of cooking
utensils, the arithmetic mean roughness (Ra) of the first coating film 20 is preferably
not less than 0.07 µm and more preferably not less than 0.1 µm. Furthermore, the thickness
of the first coating film 20 is preferably not less than 1 µm and more preferably
not less than 1.5 µm.
[0026] Moreover, since the first coating film 20 is made only of glass, it has excellent
adhesion to the glass substrate 10. Therefore, the first coating film 20 is less likely
to be peeled due to friction of cooking utensils, such as pots. Hence, the provision
of the first coating film 20 made only of glass enables effective reduction of slip
of cooking utensils without impairing the design.
[0027] No particular limitation is placed on the type of the glass constituting the first
coating film 20 but examples include borosilicate glasses, silicate glasses containing
at least one of an alkali metal component and an alkaline earth metal component, and
phosphate glasses containing zinc and aluminum.
[0028] The first coating film 20 can be formed, for example, by printing a paste containing
glass powder, a vehicle (a solvent medium made of a binder, a solvent, and so on),
and so on by various printing methods, such as screen printing or ink-jet printing.
More specifically, the first coating film 20 is formed by firing a printed paste layer.
The firing temperature is, but not necessarily limited to, preferably not less than
600°C and more preferably not less than 700°C. Furthermore, the firing temperature
is preferably not more than 900°C and more preferably not more than 850°C.
[0029] In the present invention, the area of the first coating film 20 when viewed from
the direction perpendicular to the cooking surface 11 is preferably within the range
of 0.5 to 70%, more preferably 1 to 60%, and particularly preferably 1.5 to 50% of
the entire area of the cooking surface. If the area of the first coating film 20 is
too small, the slip of cooking utensils may not be able to be sufficiently reduced.
If the area of the first coating film 20 is too large, a vitreous texture thereof
may be likely to be impaired.
[0030] A second coating film 30 is provided on the back surface 12 of the glass substrate
10. The second coating film 30 is a light shielding film closely coated on the entire
surface except for a region where a display is formed. Therefore, the provision of
the second coating film 30 enables hiding of internal devices, such as a heater, located
inside of the cooking device.
[0031] The second coating film 30 preferably contains a glass component and a pigment. The
content of the glass component in the second coating film 30 is preferably 20 to 99%
by mass and more preferably 30 to 95% by mass. Examples of the glass component that
can be preferably used include borosilicate glasses, silicate glasses containing at
least one of an alkali metal component and an alkaline earth metal component, and
phosphate glasses containing zinc and aluminum.
[0032] The content of the pigment in the second coating film 30 is preferably 1 to 80% by
mass and more preferably 5 to 70% by mass. An inorganic pigment is preferably used
as the pigment. Examples of the inorganic pigment that can be used include white pigments,
such as TiO
2, ZrO
2, and ZrSiO
4, Co-Al-Zn-based, Co-Al-Si-based, and Co-Al-Ti-based blue pigments, Co-Al-Cr-based
and Co-Ni-Ti-Zn-based green pigments, Ti-Sb-Cr-based and Ti-Ni-based yellow pigments,
Co-Si-based red pigments, Ti-Fe-Zn-based, Fe-Zn-based, Fe-Ni-Cr-based, and Zn-Fe-Cr-Al-based
brown pigments, and Cu-Cr-based, Cu-Cr-Fe-based, and Cu-Cr-Mn-based black pigments.
[0033] The second coating film 30 can be formed, for example, by printing a paste containing
glass powder, pigment powder, a vehicle, and so on by various printing methods, such
as screen printing or ink-jet printing. More specifically, the second coating film
30 is formed by firing a printed paste layer. The firing temperature is, but not necessarily
limited to, preferably not less than 600°C and more preferably not less than 700°C.
Furthermore, the firing temperature is preferably not more than 900°C and more preferably
not more than 850°C.
[0034] In the present invention, a metal film formed by sputtering or other processes may
be provided as the second coating film, i.e., the light shielding film.
[0035] Note that in the present invention the second coating film, i.e., the light shielding
film, may not be provided. In this case, it is preferred to use, as the glass substrate,
a V
2O
5-containing Li
2O-Al
2O
3-SiO
2-based, deeply colored, crystallized glass plate or a β-spodumene-precipitated Li
2O-Al
2O
3-SiO
2-based crystallized glass plate. Thus, internal devices and so on located inside of
the cooking device can be hidden even without providing any light shielding film.
[0036] As thus far described, since the top plate for a cooking device according to the
present invention includes the first coating film made of glass, it has an excellent
design and can reduce the slip of cooking utensils, such as pots. Therefore, the top
plate can be suitably used for gas cooking devices, IH cooking devices, radiant heater-equipped
cooking devices, and so on. In the case of gas cooking devices, a trivet or the like
on which a cooking utensil is to be placed may be disposed on the top plate. According
to the present invention, scrapes on and peeling of the coating film caused by friction
of such a trivet or the like against the top plate can also be reduced.
[0037] Hereinafter, the present invention will be demonstrated by offering specific examples
of the present invention. However, the present invention is not limited to the following
examples.
(Example 1)
[0038] A paste prepared by uniformly mixing a B
2O
3-SiO
2-based glass frit and a vehicle to reach a mass ratio (glass frit to vehicle) of 57:43
was printed on a cooking surface of a glass substrate using screen printing and then
fired at 830°C, thus producing a top plate for a cooking device in which a dot-patterned
first coating film was formed on the cooking surface of the glass substrate. The thickness
of the first coating film was 3.5 µm.
(Comparative Example 1)
[0039] A paste prepared by uniformly mixing a TiO
2 pigment as a white pigment, a B
2O
3-SiO
2-based glass frit, and a vehicle to reach a mass ratio (TiO
2 pigment to glass frit to vehicle) of 17:40:43 was printed on a cooking surface of
a glass substrate using screen printing and then fired at 830°C, thus producing a
top plate for a cooking device in which a dot-patterned first coating film was formed
on the cooking surface of the glass substrate. The thickness of the first coating
film was 3.5 µm.
(Evaluation)
Evaluation on Denseness:
[0040] The denseness of the first coating films of the top plates for cooking devices obtained
in Example 1 and Comparative Example 1 was evaluated by applying a water-based red
ink on the surface of each coating film, allowing the ink to stand for five minutes,
then wiping off the ink with a cloth, and visually observing whether or not the ink
seeped into the coating film.
[0041] Whereas no seeping was observed on the coating film of Example 1 made only of glass,
seeping was observed on the coating film of Comparative Example 1 made of glass and
inorganic pigment. The coating film of Example 1 made only of glass was confirmed
to be a dense film.
Evaluation on Smoothness:
[0042] The smoothness of the first coating films of the top plates for cooking devices obtained
in Example 1 and Comparative Example 1 was evaluated using a stylus surface roughness
measuring instrument (manufactured by Mitutoyo Corporation, product name: SJ-400).
[0043] Fig. 3 is a graph showing results of evaluation on smoothness of the first coating
film of the top plate for a cooking device obtained in Example 1 and Fig. 4 is a graph
showing results of evaluation on smoothness of the first coating film of the top plate
for a cooking device obtained in Comparative Example 1. In Figs. 3 and 4, the ordinate
axis represents the displacement (µm) of the first coating film along the thickness
direction thereof and the abscissa axis represents the displacement (µm) of the first
coating film along the surface direction thereof.
[0044] It was confirmed from Figs. 3 and 4 that the first coating film of Example 1 made
only of glass had a smooth surface as compared with the first coating film of Comparative
Example 1 made of glass and inorganic pigment.
Evaluation on Adhesion and Noticeability of Scrapes:
[0045] The first coating films of the top plates for cooking devices obtained in Example
1 and Comparative Example 1 were subjected to an abrasion resistance test. The abrasion
resistance test was performed by applying 200-grit abrasive paper on a 1.3 kg weight
and reciprocating the weight on the surface of each first coating film 1000 times.
The adhesion between the first coating film and the glass substrate and the noticeability
of scrapes made on the first coating film were evaluated by visually observing, after
the abrasion resistance test, whether or not the first coating film was peeled and
whether or not the surface of the first coating film was clouded.
[0046] The coating film of Example 1 made only of glass caused neither peeling nor clouding
of the surface and had excellent adhesion and scrapes made thereon were unnoticeable.
In contrast, peeling and surface clouding were observed on the coating film of Comparative
Example 1 made of glass and inorganic pigment, the adhesion thereof was low as compared
with the coating film of Example 1 made only of glass, and scrapes made thereon were
noticeable.
[Reference Signs List]
[0047]
- 1
- top plate for cooking device
- 10
- glass substrate
- 11
- cooking surface
- 12
- back surface
- 20
- first coating film
- 30
- second coating film
1. A top plate (1) for a cooking device comprising:
a glass substrate (10) that has a cooking surface (11) on which a cooking utensil
is to be placed and a back surface (12) located on a side opposite to the cooking
surface (11) ; and a first coating film (20) provided on the cooking surface (11)
and having a pattern, wherein the first coating film (20) is made only of glass and
is substantially free of any inorganic pigment,
wherein the glass substrate (10) is transparent and the top plate (1) further comprises
a second coating film (30) provided on the back surface of the glass substrate (10),
wherein the second coating film (30) is a light shielding film, or wherein the glass
substrate (10) is a deeply colored crystallized glass plate.
2. The top plate (1) for a cooking device according to claim 1, wherein the pattern is
a dotted, lattice or linear pattern.
3. The top plate (1) for a cooking device according to claim 1 or 2, wherein the second
coating film (30) is closely coated on the entire surface except for a region where
a display is formed.
4. The top plate (1) for a cooking device according to any one of claims 1 to 3, wherein
the second coating film (30) contains a glass component and a pigment, preferably
wherein the content of the glass component in the second coating film (30) is 20 to
99% by mass and the content of the pigment in the second coating film (30) is 1 to
80% by mass, and more preferably wherein the content of the glass component in the
second coating film (30) is 30 to 95% by mass and the content of the pigment in the
second coating film (30) is 5 to 70% by mass.
5. The top plate (1) for a cooking device according to claim 4, wherein the inorganic
pigment is a pigment selected from the group consisting of TiO2 white pigment, ZrO2 white pigment, ZrSiO4 white pigment, Co-Al-Zn-based blue pigments, Co-Al-Si-based blue pigments, Co-Al-Ti-based
blue pigments, Co-Al-Cr-based green pigments, Co-Ni-Ti-Zn-based green pigments, Ti-Sb-Cr-based
yellow pigments, Ti-Ni-based yellow pigments, Co-Si-based red pigments, Ti-Fe-Zn-based
brown pigments, Fe-Zn-based brown pigments, Fe-Ni-Cr-based brown pigments, Zn-Fe-Cr-Al-based
brown pigments, Cu-Cr-based black pigments, Cu-Cr-Fe-based black pigments, and Cu-Cr-Mn-based
black pigments.
6. The top plate (1) for a cooking device according to claim 4 or 5, wherein the glass
component of the second layer is a borosilicate glass, a silicate glass containing
at least one of an alkali metal component and an alkaline earth metal component, and
a phosphate glass containing zinc and aluminum.
7. The top plate (1) for a cooking device according to any one of claims 1 to 3, wherein
the second coating film (30) is a metal film, preferably a metal film formed by sputtering.
8. The top plate (1) for a cooking device according to any one of claims 1 to 3, wherein
the deeply colored crystallized glass plate is a V2O5-containing Li2O-Al2O3-SiO2-based deeply colored crystallized glass plate or a β-spodumene-precipitated Li2O-Al2O3-SiO2-based crystallized glass plate.
9. The top plate (1) for a cooking device according to any one of claims 1 to 8, wherein
the arithmetic mean roughness (Ra) of the first coating film (20) is not less than
0.07 µm and not more than 1.0 µm, preferably not less than 0.1 µm and not more than
0.4 µm.
10. The top plate (1) for a cooking device according to any one of claims 1 to 9, wherein
the thickness of the first coating film (20) is not less than 1 µm and not more than
10 µm, preferably not less than 1.5 µm and not more than 6 µm.
11. The top plate (1) for a cooking device according to any one of claims 1 to 10, wherein
the glass constituting the first coating film (20) is a borosilicate glass, a silicate
glass containing at least one of an alkali metal component and an alkaline earth metal
component, and a phosphate glass containing zinc and aluminum.
12. The top plate (1) for a cooking device according to any one of claims 1 to 11, wherein
the area of the first coating film (20) when viewed from the direction perpendicular
to the cooking surface (11) is within the range of 0.5 to 70%, preferably 1 to 60%,
and more preferably 1.5 to 50% of the entire area of the cooking surface.
1. Oberplatte (1) für eine Kochvorrichtung, umfassend:
ein Glassubstrat (10), welches eine Kochfläche (11), auf der ein Kochutensil platziert
werden soll, und eine Rückseitenfläche (12) aufweist, die auf einer Seite gegenüber
der Kochfläche (11) angeordnet ist, und
einen ersten Beschichtungsfilm (20), der auf der Kochfläche (11) vorgesehen ist und
eine Struktur aufweist, wobei der erste Beschichtungsfilm (20) nur aus Glas gefertigt
ist und im Wesentlichen frei von irgendeinem anorganischen Pigment ist,
wobei das Glassubstrat (10) transparent ist und die Oberplatte (1) ferner einen zweiten
Beschichtungsfilm (30) umfasst, der auf der Rückseitenfläche des Glassubstrats (10)
vorgesehen ist, wobei der zweite Beschichtungsfilm (30) ein Lichtabschirmungsfilm
ist oder wobei das Glassubstrat (10) eine tiefgefärbte kristallisierte Glasplatte
ist.
2. Oberplatte (1) für eine Kochvorrichtung nach Anspruch 1, wobei die Struktur eine Punkt-,
Gitter- oder Linienstruktur ist.
3. Oberplatte (1) für eine Kochvorrichtung nach Anspruch 1 oder 2, wobei der zweite Beschichtungsfilm
(30) nahezu auf der gesamten Oberfläche aufgetragen ist, mit Ausnahme eines Bereichs,
in dem eine Anzeige ausgebildet ist.
4. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 3, wobei der
zweite Beschichtungsfilm (30) eine Glaskomponente und ein Pigment enthält, wobei vorzugsweise
der Gehalt der Glaskomponente im zweiten Beschichtungsfilm (30) 20 bis 99 Massenprozent
beträgt und der Gehalt an Pigment im zweiten Beschichtungsfilm (30) 1 bis 80 Massenprozent
beträgt und wobei stärker bevorzugt der Gehalt der Glaskomponente im zweiten Beschichtungsfilm
(30) 30 bis 95 Massenprozent beträgt und der Gehalt an Pigment im zweiten Beschichtungsfilm
(30) 5 bis 70 Massenprozent beträgt.
5. Oberplatte (1) für eine Kochvorrichtung nach Anspruch 4, wobei das anorganische Pigment
ein Pigment ist, das aus der Gruppe ausgewählt ist, die aus TiO2-Weißpigment, ZrO2-Weißpigment, ZrSiO4-Weißpigment, Co-Al-Zn-basierten Blaupigmenten, Co-Al-Si-basierten Blaupigmenten,
Co-Al-Ti-basierten Blaupigmenten, Co-Al-Cr-basierten Grünpigmenten, Co-Ni-Ti-Zn-basierten
Grünpigmenten, Ti-Sb-Cr-basierten Gelbpigmenten, Ti-Ni-basierten Gelbpigmenten, Co-Si-basierten
Rotpigmenten, Ti-Fe-Zn-basierten Braunpigmenten, Fe-Zn-basierten Braunpignmenten,
Fe-Ni-Cr-basierten Braunpigmenten, Zn-Fe-Cr-Al-basierten Braunpigmenten, Cu-Cr-basierten
Schwarzpigmenten, Cu-Cr-Fe-basierten Schwarzpigmenten und Cu-Cr-Mnbasierten Schwarzpigmenten
besteht.
6. Oberplatte (1) für eine Kochvorrichtung nach Anspruch 4 oder 5, wobei die Glaskomponente
der zweiten Schicht ein Borosilikatglas, ein eine Alkalimetallkomponente und/oder
eine Erdalkalimetallkomponente enthaltendes Silikatglas und ein Zink und Aluminium
enthaltendes Phosphatglas ist.
7. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 3, wobei zweite
Beschichtungsfilm (30) ein Metallfilm, vorzugsweise ein durch Sputtern gebildeter
Metallfilm ist.
8. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 3, wobei die
tiefgefärbte kristallisierte Glasplatte eine V2O5 enthaltende Li2O-Al2O3-SiO2-basierte tiefgefärbte kristallisierte Glasplatte oder eine Li2O-Al2O3-SiO2-basierte kristallisierte Glasplatte ist, aus der β-Spodumen ausgeschieden ist.
9. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 8, wobei die
arithmetische mittlere Rauigkeit (Ra) des ersten Beschichtungsfilms (20) nicht weniger
als 0,07 µm und nicht mehr als 1,0 µm, vorzugsweise nicht weniger als 0,1 µm und nicht
mehr als 0,4 µm beträgt.
10. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 9, wobei die
Dicke des ersten Beschichtungsfilms (20) nicht weniger als 1 µm und nicht mehr als
10 µm, vorzugsweise nicht weniger als 1,5 µm und nicht mehr als 6 µm beträgt.
11. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 10, wobei das
Glas, welches den ersten Beschichtungsfilm (20) bildet, ein Borosilikatglas, ein eine
Alkalimetallkomponente und/oder eine Erdalkalimetallkomponente enthaltendes Silikatglas
und ein Zink und Aluminium enthaltendes Phosphatglas ist.
12. Oberplatte (1) für eine Kochvorrichtung nach einem der Ansprüche 1 bis 11, wobei die
Fläche des ersten Beschichtungsfilms (20), bei Betrachtung aus der Richtung senkrecht
zur Kochfläche (11), innerhalb eines Bereichs von 0,5 bis 70 %, vorzugsweise 1 bis
60 % und stärker bevorzugt 1,5 bis 50 % der Gesamtfläche der Kochfläche beträgt.
1. Plaque supérieure (1) pour un appareil de cuisson, ladite plaque comprenant :
un substrat en verre (10) qui a une surface de cuisson (11), sur laquelle doit être
placé un ustensile de cuisson, et une surface arrière (12) placée sur un côté opposé
de la surface de cuisson (11) ; et
un premier film de revêtement (20) prévu sur la surface de cuisson (11) et ayant un
motif, plaque dans laquelle le premier film de revêtement (20) est composé seulement
de verre et est pratiquement exempt de tout pigment inorganique,
plaque dans laquelle le substrat en verre (10) est transparent, et la plaque supérieure
(1) comprend en outre un second film de revêtement (30) prévu sur la surface arrière
du substrat en verre (10), où le second film de revêtement (30) est un film de protection
contre la lumière, ou bien plaque dans laquelle le substrat en verre (10) est une
plaque de verre cristallisé de couleur foncée.
2. Plaque supérieure (1) pour un appareil de cuisson selon la revendication 1, plaque
dans laquelle le motif est un motif en pointillé, en réseau ou linéaire.
3. Plaque supérieure (1) pour un appareil de cuisson selon la revendication 1 ou 2, plaque
dans laquelle le second film de revêtement (30) est étroitement appliqué sur la totalité
de la surface, à l'exception d'une zone où un écran est formé.
4. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 3, plaque dans laquelle le second film de revêtement (30) contient un composant
en verre et un pigment, de préférence plaque dans laquelle la teneur du composant
en verre dans le second film de revêtement (30) est de 20 % à 99 % en masse et la
teneur du pigment dans le second film de revêtement (30) est de 1 % à 80 % en masse
et, de façon plus préférable, plaque dans laquelle la teneur du composant en verre
dans le second film de revêtement (30) est de 30 % à 95 % en masse et la teneur du
pigment dans le second film de revêtement (30) est de 5 % à 70 % en masse.
5. Plaque supérieure (1) pour un appareil de cuisson selon la revendication 4, plaque
dans laquelle le pigment inorganique est un pigment sélectionné parmi le groupe se
composant d'un pigment blanc de TiO2, d'un pigment blanc de ZrO2, d'un pigment blanc de ZrSiO4, de pigments bleus à base de Co-Al-Zn, de pigments bleus à base de Co-Al-Si, de pigments
bleus à base de Co-Al-Ti, de pigments verts à base de Co-Al-Cr, de pigments verts
à base de Co-Ni-Ti-Zn, de pigments jaunes à base de Ti-Sb-Cr, de pigments jaunes à
base de Ti-Ni, de pigments rouges à base de Co-Si, de pigments bruns à base de Ti-Fe-Zn,
de pigments bruns à base de Fe-Zn, de pigments bruns à base de Fe-Ni-Cr, de pigments
bruns à base de Zn-Fe-Cr-Al, de pigments noirs à base de Cu-Cr, de pigments noirs
à base de Cu-Cr-Fe et de pigments noirs à base de Cu-Cr-Mn.
6. Plaque supérieure (1) pour un appareil de cuisson selon la revendication 4 ou 5, plaque
dans laquelle le composant en verre de la seconde couche est un verre borosilicaté,
un verre silicaté contenant au moins l'un d'un composant de métal alcalin et d'un
composant de métal alcalino-terreux, et un verre phosphaté contenant du zinc et de
l'aluminium.
7. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 3, plaque dans laquelle le second film de revêtement (30) est un film métallique,
de préférence un film métallique formé par pulvérisation cathodique.
8. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 3, où la plaque de verre cristallisé de couleur foncée est une plaque de verre
cristallisé de couleur foncée à base de Li2O-Al2O3-SiO2 et contenant du V2O5, ou bien une plaque de verre cristallisé à base de Li2O-Al2O3-SiO2 précipités sous forme de β-spodumène.
9. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 8, plaque dans laquelle la rugosité moyenne arithmétique (Ra) du premier film
de revêtement (20) n'est pas inférieure à 0,07 µm et pas supérieure à 1,0 µm, de préférence
n'est pas inférieure à 0,1 µm et pas supérieure à 0,4 µm.
10. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 9, plaque dans laquelle l'épaisseur du premier film de revêtement (20) n'est pas
inférieure à 1 µm et pas supérieure à 10 µm, de préférence n'est pas inférieure à
1,5 µm et pas supérieure à 6 µm.
11. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 10, plaque dans laquelle le verre constituant le premier film de revêtement (20)
est un verre borosilicaté, un verre silicaté contenant au moins l'un d'un composant
de métal alcalin et d'un composant de métal alcalino-terreux, et un verre phosphaté
contenant du zinc et de l'aluminium.
12. Plaque supérieure (1) pour un appareil de cuisson selon l'une quelconque des revendications
1 à 11, plaque dans laquelle la zone du premier film de revêtement (20), quand elle
est vue depuis la direction perpendiculaire à la surface de cuisson (11), est comprise
dans la plage allant de 0,5 % à 70 %, de préférence allant de 1 % à 60 % et, de façon
plus préférable, allant de 1,5 % à 50 % de la zone totale de la surface de cuisson.