EP3220059A1 - Oberplatte für eine kochvorrichtung - Google Patents

Oberplatte für eine kochvorrichtung Download PDF

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Publication number
EP3220059A1
EP3220059A1 EP15858386.4A EP15858386A EP3220059A1 EP 3220059 A1 EP3220059 A1 EP 3220059A1 EP 15858386 A EP15858386 A EP 15858386A EP 3220059 A1 EP3220059 A1 EP 3220059A1
Authority
EP
European Patent Office
Prior art keywords
coating film
cooking
glass
top plate
cooking device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15858386.4A
Other languages
English (en)
French (fr)
Other versions
EP3220059A4 (de
EP3220059B1 (de
Inventor
Toshiaki KANAZAWA
Shohei Yokoyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Electric Glass Co Ltd
Original Assignee
Nippon Electric Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Electric Glass Co Ltd filed Critical Nippon Electric Glass Co Ltd
Publication of EP3220059A1 publication Critical patent/EP3220059A1/de
Publication of EP3220059A4 publication Critical patent/EP3220059A4/de
Application granted granted Critical
Publication of EP3220059B1 publication Critical patent/EP3220059B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices

Definitions

  • the present invention relates to top plates for cooking devices.
  • 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.
  • Patent Literatures 1 to 3 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.
  • the coating film is described as being made of glass and inorganic pigment.
  • the coating film is described as being formed on the whole or part of the cooking surface of the top plate.
  • the coating films disclosed in Patent Literatures 1 to 3 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.
  • 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.
  • a top plate for a cooking device 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, the first coating film being made only of glass.
  • 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.
  • the glass substrate may be transparent.
  • the top plate preferably further includes a second coating film provided on the back surface of the glass substrate.
  • the glass substrate may be a deeply colored crystallized glass plate.
  • 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.
  • 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.
  • the back surface 12 is a surface located toward the inside of the cooking device.
  • the glass substrate 10 preferably has excellent thermal resistance and a low coefficient of thermal expansion.
  • the softening point of the glass substrate 10 is preferably 700°C or more and more preferably 750°C or more.
  • 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.
  • the glass substrate 10 is made of a low-expansion crystallized glass.
  • the low-expansion crystallized glass include a crystallized glass N-0 manufactured by Nippon Electric Glass Co., Ltd., for example.
  • 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.
  • 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.
  • 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.
  • a dotted pattern is provided as the first coating film 20.
  • 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.
  • the size of the pattern of the first coating film 20 preferably has a diameter in the range of 0.5 to 5 mm.
  • each side of the coating film 20 preferably has a length in the range of 0.2 to 4 mm.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first coating film 20 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.
  • 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.
  • the arithmetic mean roughness (Ra) of the first coating film 20 is preferably not more than 1.0 ⁇ m and more preferably not more than 0.4 ⁇ m. Furthermore, the thickness of the first coating film 20 is preferably not more than 10 ⁇ m and more preferably not more than 6 ⁇ m.
  • the arithmetic mean roughness (Ra) of the first coating film 20 is preferably not less than 0.07 ⁇ m and more preferably not less than 0.1 ⁇ m. Furthermore, the thickness of the first coating film 20 is preferably not less than 1 ⁇ m and more preferably not less than 1.5 ⁇ m.
  • 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.
  • the type of the glass constituting the first coating film 20 includes 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a metal film formed by sputtering or other processes may be provided as the second coating film, i.e., the light shielding film.
  • the second coating film i.e., the light shielding film
  • the glass substrate it is preferred to use, as the glass substrate, a V 2 O 5 -containing Li 2 O-Al 2 O 3 -SiO 2 -based, deeply colored, crystallized glass plate or a ⁇ -spodumene-precipitated Li 2 O-Al 2 O 3 -SiO 2 -based crystallized glass plate.
  • a V 2 O 5 -containing Li 2 O-Al 2 O 3 -SiO 2 -based, deeply colored, crystallized glass plate or a ⁇ -spodumene-precipitated Li 2 O-Al 2 O 3 -SiO 2 -based crystallized glass plate it is preferred to use, as the glass substrate, a V 2 O 5 -containing Li 2 O-Al 2 O 3 -SiO 2 -based, deeply colored, crystallized glass plate or a ⁇ -spodumene-precipitated Li 2 O-Al 2
  • the top plate for a cooking device 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.
  • 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.
  • a paste prepared by uniformly mixing a B 2 O 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 ⁇ m.
  • a paste prepared by uniformly mixing a TiO 2 pigment as a white pigment, a B 2 O 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 ⁇ m.
  • Example 1 and Comparative Example 1 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.
  • 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.
  • Example 1 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).
  • 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
  • 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.
  • the ordinate axis represents the displacement ( ⁇ m) of the first coating film along the thickness direction thereof
  • the abscissa axis represents the displacement ( ⁇ m) of the first coating film along the surface direction thereof.
  • 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • Surface Treatment Of Glass (AREA)
EP15858386.4A 2014-11-12 2015-08-11 Oberplatte für eine kochvorrichtung Active EP3220059B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014229959A JP2016095050A (ja) 2014-11-12 2014-11-12 調理器用トッププレート
PCT/JP2015/072763 WO2016075972A1 (ja) 2014-11-12 2015-08-11 調理器用トッププレート

Publications (3)

Publication Number Publication Date
EP3220059A1 true EP3220059A1 (de) 2017-09-20
EP3220059A4 EP3220059A4 (de) 2018-07-04
EP3220059B1 EP3220059B1 (de) 2021-01-20

Family

ID=55954067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15858386.4A Active EP3220059B1 (de) 2014-11-12 2015-08-11 Oberplatte für eine kochvorrichtung

Country Status (4)

Country Link
EP (1) EP3220059B1 (de)
JP (1) JP2016095050A (de)
CN (1) CN206919086U (de)
WO (1) WO2016075972A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12030807B2 (en) 2018-02-19 2024-07-09 Eurokera S.N.C. Glass-ceramic article

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3078066B1 (fr) * 2018-02-19 2023-03-24 Eurokera Article vitrocéramique anti-traces de doigts
DE102022119588A1 (de) * 2022-08-04 2024-02-15 Schott Ag Platte umfassend Glas oder Glaskeramik, Verfahren zu deren Herstellung sowie deren Verwendung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60207749T3 (de) * 2001-06-12 2013-12-24 Nippon Electric Glass Co., Ltd. Kochplattenoberteil für Kochgerät mit elektromagnetischer Induktionsheizeinheit
JP2003054997A (ja) * 2001-08-22 2003-02-26 Matsushita Electric Ind Co Ltd 調理器用トッププレート
JP2003302061A (ja) * 2002-04-08 2003-10-24 Matsushita Electric Ind Co Ltd 加熱調理器
JP2005276584A (ja) * 2004-03-24 2005-10-06 Sanka Kogyo Kk トッププレート
CN101454254B (zh) * 2006-05-29 2012-04-18 日本电气硝子株式会社 Li2O-A12O3-SiO2系结晶化玻璃
DE102006027739B4 (de) * 2006-06-16 2008-05-29 Schott Ag Kochfeld mit einer Glaskeramikplatte als Kochfläche
JP2008192455A (ja) * 2007-02-05 2008-08-21 Narumi China Corp 加熱調理器用ガラストッププレート
JP4946963B2 (ja) * 2008-04-15 2012-06-06 パナソニック株式会社 誘導加熱調理器
JP2010071515A (ja) * 2008-09-17 2010-04-02 Narumi China Corp 調理器用トッププレート
JP5621121B2 (ja) * 2010-03-15 2014-11-05 日本電気硝子株式会社 電磁加熱調理器用トッププレート
JP2013238361A (ja) * 2012-05-16 2013-11-28 Nippon Electric Glass Co Ltd 調理器用トッププレート
JP2014037926A (ja) * 2012-08-17 2014-02-27 Nippon Electric Glass Co Ltd 調理器用トッププレートの製造方法及び調理器用トッププレート

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12030807B2 (en) 2018-02-19 2024-07-09 Eurokera S.N.C. Glass-ceramic article

Also Published As

Publication number Publication date
CN206919086U (zh) 2018-01-23
JP2016095050A (ja) 2016-05-26
EP3220059A4 (de) 2018-07-04
WO2016075972A1 (ja) 2016-05-19
EP3220059B1 (de) 2021-01-20

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