JP2003180516A - Cooker for electromagnetic cooking device and its preparation process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooker for electromagnetic cooking devices which is made mainly from pottery material, glass, ceramics or the like and can be relatively easily prepared without using large equipment or apparatuses, and is excellent in durability, heat resistance, corrosion resistance, discoloration resistance, safety, environment resistance and the like, and is rich in decorativeness. <P>SOLUTION: In this cooker 1 for the electromagnetic cooking devices, a heating layer 2 is formed to cover the whole underside of a bottom surface of a cooker main body 1a which is fired to have a pot shape with materials for toughened porcelain, such as quartz, sericite, kaolinite, alumina and the like as the main material. A protective layer 3 is formed to cover the whole heating layer 2. The heating layer 2 contains silver or the like. The protective layer 3 contains silicon oxide, boron oxide, sodium oxide, potassium oxide or the like. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooker for an electromagnetic cooker which can be cooked by heating with an electromagnetic cooker and a method for manufacturing the same.

[0002]

2. Description of the Related Art An electromagnetic cooker can cook foods without flames, does not generate combustion gas such as carbon dioxide, and does not have a risk of catching tempura oil when cooking tempura, and is energy efficient. Since it is high, it is gradually spreading to general households in recent years.

However, cooking utensils such as pots that can be used in electromagnetic cookers are limited to those made of materials that generate self-heating when eddy currents are generated when placed in electromagnetic cookers. You cannot use cooking utensils such as glass pots or ceramic pots. For this reason, although the electromagnetic cooker is suitable for earthenware dishes that are often eaten around a dining table, there is a drawback that the electromagnetic cooker cannot be used.

In order to meet such demands, a ceramic or non-metallic cooking utensil that can be used in an electromagnetic cooker has been developed, and is disclosed in Japanese Patent Laid-Open Nos. 9-100184 and 2000-23837. Is disclosed in.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The cooking utensil disclosed in Japanese Patent No. 4 is provided with a heating film made of silver and platinum on the bottom surface of the bottom of the ceramics, and a peeling prevention film made of calcium silicate or the like is provided so as to cover the heating film. However, the thickness of the exothermic film is about 0.
Since it is relatively thick, about 1 mm, when repeated cooking with an electromagnetic cooker, minute cracks or cracks occur in the heating film due to the difference in coefficient of thermal expansion between the ceramic and the heating film, or the heating film partially May peel off.

When a crack or the like is generated in the heat-generating film, the heat-generating film is partially broken, so that even if the heat-generating film is placed on the electromagnetic cooker in a predetermined manner, a sufficient eddy current does not occur in the heat-generating film, and the amount of heat generation is reduced. May be significantly reduced. Further, if the exothermic film is partially peeled off, the heat conduction from the exothermic film to the ceramic is hindered, and the thermal efficiency may be significantly reduced.

On the other hand, in the cooking container disclosed in Japanese Patent Laid-Open No. 2000-23837, a non-metal container or the like is shot blasted, a copper alloy or the like is sprayed, and then a heat resistant coating material is applied and fixed. Because it can be manufactured only through the complicated process of applying liquid glass,
Not only does it take a great deal of time to manufacture, but also large-scale equipment and devices are required, resulting in high manufacturing costs.

[0008] The problem to be solved by the present invention is to use ceramic materials, glass, ceramics, etc. as the main raw materials, which can be manufactured relatively easily without using large-scale equipment or devices, and have durability, heat resistance, An object of the present invention is to provide a cooking utensil for an electromagnetic cooker, which is excellent in corrosion resistance, fading resistance, safety, environment resistance, and the like, and which is rich in decorativeness.

[0009]

A cooker for an electromagnetic cooker according to the present invention comprises a heating layer containing at least one of platinum and silver on at least a bottom lower surface of a cooker body mainly made of a dielectric inorganic substance, A protective layer covering the heating layer,
The protective layer contains any one of silicon oxide, boron oxide, sodium oxide, and potassium oxide.

When the cooking utensil for an electromagnetic cooker having such a structure is placed at a predetermined position of the electromagnetic cooker, an eddy current is generated in the heating layer at the bottom of the cooking utensil due to the alternating magnetic field generated from the electromagnetic cooker, and this vortex is generated. The heat generation layer generates heat due to electric resistance heat generation when an electric current flows through the heat generation layer, and this heat is transmitted to the cooking utensil body, so that the food material contained in the cooking utensil can be cooked. That is, even if the cooking utensil main body is mainly made of ceramic material, glass, ceramics or the like, a cooking utensil capable of being heated and cooked by the electromagnetic cooking device can be obtained.

Further, since the heat generating layer contains at least one of platinum and silver, the efficiency of induction heating is high and the amount of heat generated is relatively large, and thinning is possible by a simple method such as thick film printing. In addition, it is easy to form a pattern, has good adhesion to ceramics, and has excellent durability and reliability. Further, since the protective layer contains any one of silicon oxide, boron oxide, sodium oxide, and potassium oxide, it has good adhesion to the heat generating layer and is not attacked by chemical agents such as detergents and salts, It has excellent durability, heat resistance, corrosion resistance, color fading resistance, safety, environment resistance, etc., and is highly decorative.

Here, the heating layer has a thickness of 1 μm to 80 μm.
By setting the thickness of the protective layer to 1 μm to 1000 μm, the heating layer and the protective layer are excellent in durability and do not cause cracks or peeling even if heating and cooking are repeated by an electromagnetic cooker. Not only can the sufficient heat required for heating and cooking be exerted, but also the excellent cooking effect originally possessed by ceramics can be maintained.

Further, in the method for manufacturing a cooking utensil for an electromagnetic cooker according to the present invention, at least one of platinum and silver, glass frit, ethyl cellulose and terpineol are provided on at least the bottom lower surface of the cooking utensil body mainly made of a dielectric inorganic substance. After applying a heat generating paste containing, a first sintering step of sintering the heat generating paste to form a heat generating layer, and protection containing any of silicon oxide, boron oxide, sodium oxide and potassium oxide. A second sintering step of applying the layer paste to the surface of the heat generating layer and then sintering the protective layer paste to form the protective layer.
Here, the glass frit is silicon oxide, boron oxide, etc., and the terpineol is a solvent that dissolves the resin, and is a lead-free solvent that does not adversely affect the natural environment and the human body.

With such a constitution, as described above, it is excellent in heat resistance, fire resistance, water resistance, corrosion resistance, discoloration resistance, durability, chemical resistance, environmental resistance, etc., and is highly decorative. It is possible to form cooking utensils for electromagnetic cookers, and these manufacturing processes can be carried out using conventional ceramics manufacturing equipment, so it is relatively easy to cook for electromagnetic cookers without using large-scale equipment or devices. It becomes possible to manufacture a tool.

[0015]

1 is a partially cutaway side view showing a cooking utensil for an electromagnetic cooker according to an embodiment of the present invention. In the cooker 1 for the electromagnetic cooker, heat is generated so as to entirely cover the bottom lower surface of the pot-shaped cooker body 1a that is fired by using reinforced porcelain materials such as quartz, sericite, kaolinite, and alumina as main raw materials. The layer 2 is formed, and the protective layer 3 is formed so as to entirely cover the heat generating layer 2. The heat generating layer 2 contains silver and the like, and the protective layer 3 contains silicon oxide, boron oxide, sodium oxide, potassium oxide and the like.

When the cooker 1 for the electromagnetic cooker is placed at a predetermined position on the electromagnetic cooker 4, an alternating magnetic field generated from the electromagnetic cooker 4 produces an eddy current in the heat generating layer 2 at the bottom of the cooker 1.
The heat generation layer 2 generates heat due to electric resistance heat generation when this eddy current flows through the heat generation layer 2, and this heat is transmitted to the cooking utensil body 1a, so that the foodstuff F contained in the cooking utensil 1 is cooked. be able to.

As described above, even if the cooking utensil body 1a is a non-conductive object whose main raw material is a porcelain material, the electromagnetic cooker 4 is used.
The cooking utensil 1 has an excellent cooking effect obtained by the porcelain cooking utensil main body 1a, because it can be heated and cooked by
For example, the far-infrared rays emitted from the heated porcelain slowly heat the food from its inside to warm it from the core, making the food delicious and maintaining an excellent heat retention. Since 4 can be used, it is convenient.

Further, since the heat generating layer 2 contains silver,
In addition to the high efficiency of induction heating and the relatively large amount of heat generation, the thin film can be formed by a simple method such as thick film printing, and the excellent effect that patterning is easy can be obtained. Since contains silicon oxide, boron oxide, sodium oxide, and potassium oxide, it has good adhesion to the heat generating layer 2, corrosion by chemicals such as detergent and salt is prevented, and durability is improved.

In this embodiment, the heating layer 2 has a thickness of about 11
When the thickness of the protective layer 3 is set to about 400 μm, cracks and peeling do not occur even if heating and cooking are repeated by the electromagnetic cooker 4, excellent heat retention and durability are obtained, and lead-free. Therefore, it is hygienic and does not harm the human body.

Next, a method of manufacturing the cooking utensil 1 for the electromagnetic cooker will be described. In the cooker 1 for an electromagnetic cooker, a heating paste containing silver, glass frit, ethyl cellulose, and terpineol is applied to the bottom lower surface of the cooker body 1a formed by firing a porcelain material or alumina. In this case, the heating paste can be applied by a screen printing method or a thermal spraying method, but the screen printing method is superior in the uniformity of the applied thickness. In addition, the coating thickness of the heating paste is preferably about 20 μm to 40 μm. When the heat-generating paste applied to the bottom surface of the bottom of the cooking utensil body 1a is sufficiently dried, the cooking tool body 1a is heated to around 800 ° C. to sinter the heat-generating paste to form the heat-generating layer 2.

When the cooking utensil body 1a on which the heat generating layer 2 is formed is cooled to about room temperature, a peeling prevention paste containing silicon oxide, boron oxide, sodium oxide, potassium oxide or the like is applied to the surface of the heat generating layer 2. After thoroughly drying,
By heating again at about 850 ° C., the peeling prevention paste is sintered to form the protective layer 3.

The heating layer 2 thus formed exhibits excellent adhesion to the cooking utensil body 1a, and such excellent adhesion is obtained from the glass frit, ethyl cellulose, terpineol, etc. contained in the heating paste. It is presumed that it is obtained by the ingredients and silver.

Further, the protective layer 3 not only firmly adheres to the heat generating layer 2 to prevent its peeling, but also the protective layer 3 itself is hard and is not easily scratched, and the heat resistant temperature is about 850 to 900 ° C., so that it has excellent durability. Is obtained. It is speculated that this is due to silicon oxide, boron oxide, sodium oxide, potassium oxide and the like contained in the protective layer 3, particularly sodium oxide and potassium oxide.

As described above, the cooker 1 for the electromagnetic cooker of the present embodiment exhibits the same excellent performance as the dedicated cooker in the heating cooking using the electromagnetic cooker 4, but the cooker 1 for the electromagnetic cooker is usually It can also be used for direct heating type cookers such as gas stoves and electric stoves, and in that case, excellent durability can be obtained.

Since the material of the cooking utensil body 1a constituting the cooking utensil 1 for the electromagnetic cooker is not limited to the porcelain material, the cooking utensil body may be made of ceramic materials such as peratite, clay, frog eyes, glass and ceramics. Alternatively, the cooker for an electromagnetic cooker according to the present invention can be formed even if a metal material such as alumina is used as a main raw material.

[0026]

The present invention has the following effects.

(1) A cooker body mainly made of a dielectric inorganic substance is provided with a heat generating layer containing at least one of platinum and silver and a protective layer covering the heat layer on at least the bottom lower surface of the cooker body for protection. The layer contains any one of silicon oxide, boron oxide, sodium oxide, and potassium oxide,
Mainly made of ceramic materials, glass, ceramics, etc., and can be manufactured relatively easily without using large-scale equipment or equipment. Durability, heat resistance, corrosion resistance, fading resistance,
It has excellent safety and environment resistance and is highly decorative.

(2) The thickness of the heat generating layer is 1 μm to 80 μm,
By setting the thickness of the protective layer to 1 μm to 1000 μm, it becomes a heat-generating layer and protective layer with excellent durability that does not cause cracks or peeling even after repeated heating and cooking with an electromagnetic cooker. Not only can the required heat be exerted, but also the excellent cooking effect originally possessed by ceramics can be maintained.

(3) A heat-generating paste containing at least one of platinum and silver and glass frit is applied to at least the bottom lower surface of the cooking utensil body containing a dielectric inorganic substance as a main raw material, and is sintered to form a heat-generating layer. By a manufacturing method having a first sintering step of forming and a second sintering step of forming a protective layer by applying a protective layer paste containing silicon oxide, boron oxide or the like to the surface of the heat generating layer and sintering. By using conventional porcelain manufacturing equipment without using large-scale equipment or equipment, it has excellent heat resistance, fire resistance, water resistance, corrosion resistance, fading resistance, durability, chemical resistance, environmental resistance, etc. It is possible to relatively easily manufacture the above-described cookware for an electromagnetic cooker, which is rich in nature.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a cooker for an electromagnetic cooker according to an embodiment of the present invention.

[Explanation of symbols]

1 Cooking utensils for electromagnetic cookers 1a Cooking tool body 2 Heating layer 3 protective layer 4 electromagnetic cooker F ingredients

Claims (3)

[Claims] 1. A heating layer containing at least one of platinum and silver on at least a bottom lower surface of a cooking utensil body containing a dielectric inorganic substance as a main raw material, and a protective layer for covering the heating layer to prevent peeling. And a protective layer containing any one of silicon oxide, boron oxide, sodium oxide, and potassium oxide. 2. The cooker for an electromagnetic cooker according to claim 1, wherein the heating layer has a thickness of 1 μm to 80 μm, and the protective layer has a thickness of 1 μm to 1000 μm. 3. A heat-generating paste containing at least one of platinum and silver, glass frit, ethyl cellulose and terpineol is applied to at least the bottom lower surface of the cooking utensil body containing a dielectric inorganic substance as a main raw material, and then the heat generation is performed. A first sintering step of forming a heat generating layer by sintering the paste for heating, and applying a protective layer paste containing any one of silicon oxide, boron oxide, sodium oxide and potassium oxide to the surface of the heat generating layer. And a second sintering step of sintering the protective layer paste to form the protective layer, the method for manufacturing a cooker for an electromagnetic cooker.