JPH02135688A - Heating container for microwave oven - Google Patents

Abstract

PURPOSE:To prevent the characteristics of the heating container from degradation when it is abnormally heated by providing a heat resistant layer of inorganic substance with a specific melting point on the surface of a metallic heat generation layer of the bottom of the container. CONSTITUTION:A heat resistant layer with a thickness of 20 to 300mum of inorganic substance with a melting point of 700 deg.C or more such as alumina cement or crystallized glass is provided on the surface of a metallic heat generation layer of the bottom of the container. By this arrangement, the metallic heat generation layer is prevented from such as being inflated. Accordingly, there is provided the heating container for a microwave oven without degradation of the characteristics thereof even if it is abnormally heated due to operation of the microwave oven without containing any food or scotching, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heating container such as an earthenware pot used in an electromagnetic cooker.

BACKGROUND OF THE INVENTION A heating container used in a conventional electromagnetic cooker is, for example, as shown in Japanese Utility Model Application Publication No. 80-145696.
The sprayed aluminum layer was formed using a thermal spraying method.

Further, in Japanese Utility Model Publication No. 11436/1983, a glass-based overcoat was formed after printing the silver paint.

Problems to be Solved by the Invention However, when using the above-mentioned conventional heating container, there are cases where the heating container is placed on the plate of an electromagnetic induction heating cooker while it is in an empty cooking state without any food being cooked inside it, and when electricity is turned on. Even when food is placed inside the heating container and cooked on the plate of an electromagnetic induction heating cooker, when mochi or udon burns, the temperature of the heat generating part rises to nearly 700°C, causing aluminum and There were problems such as the glass etc. in the silver paint melting and the metal heat generating layer melting and becoming unusable, and the metal heat generating layer swelling and straddling.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a heating container for an electromagnetic cooker whose characteristics are not impaired even under abnormal heating conditions such as dry cooking or burning.

Means for Solving the Problems In order to solve the above problems, the present invention provides a metal heat generating layer at the bottom of the container, and further comprises a metal heat generating layer made of an inorganic substance with a melting point of 700°C or higher on the surface of the metal heat generating layer, and 20-3
A heat-resistant layer having a thickness of 0.00 μm is provided.

Effects According to the above structure, even if the metal heat generating layer made of aluminum or silver paste softens or melts, it will not flow and will be fixed in that position, making it possible to create a heating container that will not cause melting. be.

Aluminum and silver peat, which form the metal heat generating layer, melt at 660°C in the case of aluminum;
In the case of glass in the case, it melts at a temperature of eoo~700°C, resulting in poor conductivity and no longer generating heat. The heating container becomes unusable if it is abnormally heated to this temperature, especially when empty cooking or when rice cakes, udon noodles, etc. burn.

However, the surface of these metal heat generating layers has a melting point of 700
If a heat-resistant layer made of an inorganic material with a temperature below ℃ is formed, even if the metal heat-generating layer melts due to high temperatures, the molten material will be held between the container and the heat-resistant layer and will not move, so electricity can be passed as is. Yes, but it will not lead to melting. Furthermore, when the electricity is turned off, the molten material solidifies as it is, forming the original metal heating layer, so it can be reused.

However, the thickness of this heat-resistant layer needs to be thick enough to hold the metal heat-generating layer even if it melts, and in this case, the thickness is at least 2.
It is necessary to have a thickness of 0 μm or more, and a maximum value of 300 μm or less is appropriate, depending on the material, in view of the need to withstand thermal shock.

In this way, by providing a heat-resistant layer made of an inorganic substance with a melting point of γ00°C or higher on the surface of the metal heat-generating layer,
Even in abnormal heating conditions such as dry cooking or burning, the characteristics of the metal heat generating layer will not be impaired.

EMBODIMENT OF THE INVENTION Hereinafter, a practical example of the present invention will be explained based on the accompanying drawings.

First, a No. 8 earthenware pot 1 having a diameter of 26α, a bottom diameter of 18 cm, a height of 10 ff, and an average wall thickness of 4*II was prepared. This earthenware pot 1 is made mainly of nupodumene, and has a raised platform 11L at the bottom. Then, a metal heat generating layer 2 was formed on this clay pot 1 by thermal spraying aluminum or by printing and baking silver beneto. Further, in this clay pot, a heat-resistant layer 3 was formed on the surface of the metal heat-generating layer 2 using various inorganic substances having a melting point of 700° C. or more as shown in Table 1. The heat-resistant layer 3 was formed by controlling the thickness to a range of 20 to 300 μm by printing, brush coating, coating, etc., and baking it at a temperature of 118 degrees.

Next, in order to evaluate these heating containers, dry cooking and rice cake burning tests were conducted, and the results are shown in Table 1. In addition, a conventional example without a heat-resistant layer and a case in which a heat-resistant layer having a melting point of less than γoO° C. was formed are also described.

(Margins below) In Table 1, the O mark indicates that no abnormality was observed in the test, and the X mark indicates that some abnormality was observed, such as melting of the metal heating layer or a sudden drop in power consumption. to show that

As is clear from Table 1, blacks 2 to 4 formed a heat-resistant layer with a melting point of 700°C or higher. No abnormality was observed in the samples A7 to 16, but abnormalities were observed in the conventional samples A1 and A5 to e.As shown, the surface of the metal heat generating layer 2 has a melting point of 700°C or higher. By providing the heat-resistant layer 3 having a thickness of ~300 μm (75 μm), it is possible to obtain a product whose characteristics are not impaired even during dry cooking or burning.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention, a metal heat generating layer is provided at the bottom of the container, and the surface of the metal heat generating layer is made of an inorganic substance having a melting point of 700°C or higher. To provide a heating container for an electromagnetic cooker in which the characteristics of the metal heat generating layer are not impaired even in abnormal heating conditions such as dry cooking or scorching because the heat resistant layer having a thickness of 20 to 300 μm is provided. It is something that can be done.

[Brief explanation of the drawing]

The figure is a sectional view of a heating container for an electromagnetic cooker showing an embodiment of the present invention. 1...Earthen pot (container), 2...Metal heat generating layer, 3...Heat resistant layer.

Claims (1)

[Claims] A heating container for an electromagnetic cooker, comprising a metal heating layer on the bottom of the container, and a heat-resistant layer made of an inorganic substance with a melting point of 700°C or higher and having a thickness of 20 to 300 μm on the surface of the metal heating layer. .