JPH074312B2 - Microwave heating container - Google Patents

Description

The present invention relates to a heat generating container for a microwave oven,
In particular, the present invention relates to a heating container for a microwave oven, in which a coating film that generates heat by high frequency heating is formed on the surface of the container.

[Prior Art] Put bread dough into a container that generates heat by high frequency heating,
There is a method of placing the container in a microwave oven and irradiating the container with high frequency to heat the container to bake bread. FIG. 4 is a cross-sectional view of a state where the microwave heating container is placed in the microwave.

As shown in FIG. 4, the microwave oven 1 includes an outer frame 2, a high frequency irradiation chamber 3 and a high frequency oscillator 4. A waveguide 5 is attached inside the outer frame 2, and the waveguide 5 connects the high frequency oscillator 4 and the high frequency irradiation port 3a. The high frequency generated by the high frequency oscillator 4 is guided into the high frequency irradiation chamber 3 by the waveguide 5. A microwave heating container 6 is placed in the high-frequency irradiation chamber 3. The structure of the microwave heating container 6 will be described below.

FIG. 5 is a cross-sectional view of a conventional heating container for a microwave oven.
As shown in FIG. 5, the microwave heating container 6 includes a container portion 7 and a lid 8. The container part 7 is made of aluminum,
A ferrite film 9 is formed on the outer surface of the container part 7. The lid 8 is also made of aluminum, and a ferrite film 9 is formed on the outer surface of the lid 8. The ferrite film 9 generates heat by high frequency irradiation. If the film thickness of the ferrite film 9 is large, the amount of heat generated will increase. About 200 ° C. is required to bake the bread, so the film thickness of the ferrite film 9 was 180 to 220 μm.

[Problems to be Solved by the Invention] By the way, the ferrite film is formed by spraying a viscous liquid, which is a mixture of ferrite powder and thinner, onto the container 7 and firing it. When spraying mucus containing ferrite powder etc. at a time in an amount such that the film thickness of the ferrite coating is 180 to 220 μm, mucus containing ferrite etc. drips on the surface of the container part 7 and the lid 8 for microwave oven This causes the appearance defect of the heat generating container 6.

Therefore, conventionally, a viscous liquid containing ferrite or the like is sprayed on the container portion 7 or the lid 8 in an amount such that the film thickness of the ferrite coating becomes 100 μm, and the calcined liquid is calcinated. Then, the calcined product is added again with a mucus containing ferrite powder etc.
A ferrite film having a thickness of 180 to 220 μm was formed by spraying an amount of 100 μm and firing it.

If the amount of spraying is such that the thickness of the ferrite coating is 100 μm, the possibility that mucus containing ferrite powder drips on the outer surfaces of the container part 7 and the lid 8 and causes a poor appearance is smaller than that of 180 to 220 μm. . However, since the spraying is performed twice such that the thickness of the ferrite coating becomes 100 μm, the probability that the microwave oven heat-generating container 6 has a poor appearance cannot be ignored. In other words, the amount of ferrite film 9 having a film thickness of 100 μm was sprayed on the container portion 7 and the lid 8 and the appearance was not deteriorated at the stage of calcination. Spraying may cause mucus containing ferrite or the like to drips and cause poor appearance. Moreover, when the container portion 7 and the lid 8 are first sprayed with an amount such that the film thickness of the ferrite coating film 9 becomes 100 μm, the mucus containing ferrite or the like may flow down, causing a defective appearance.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a heat generating container for a microwave oven in which a defective appearance is unlikely to occur.

[Means for Solving the Problems] The present invention relates to a heating container for a microwave oven that generates heat by high-frequency heating.

The heat generating container for a microwave oven according to the present invention is formed of a plate material having good thermal conductivity, is formed of an inner wall plate that constitutes an inner wall portion of the container and a plate material that generates heat by high frequency heating, and is located on the outer surface of the inner wall portion. An outer wall plate, and a coating formed on the surface of the outer wall plate and generating heat by high frequency heating,
Is equipped with.

[Operation] In the heat generating container for a microwave oven according to the present invention, the outer wall plate constituting the outer wall portion of the container also generates heat, so that the film thickness of the heat generating coating formed on the surface of the outer wall plate can be made thinner than before. Therefore, since the heat-generating coating forming process is performed only once, the probability that the mucus containing the heat-generating material drips on the surface of the outer wall plate and causes a poor appearance of the container is reduced.

The reason why the plate material having good thermal conductivity is used as the inner wall of the container is as follows. A plate material that generates heat by high-frequency heating generally has poor thermal conductivity. Therefore, in a single-function microwave oven that does not have a stirrer fan (a fan blade of aluminum is attached and rotating the stirrer fan stirs the high frequency) or a turntable, the high frequency is only from one direction. Since it does not hit the heat generating container for microwave oven, if the container is only a plate material that generates heat by high frequency heating, the heat generating container for microwave oven causes local heating, and the food in the heat generating container for microwave oven causes uneven burning.
Therefore, by using a plate material having good heat conductivity as the inner wall of the microwave heating container, the entire microwave heating container is heated uniformly.

[Embodiment] FIG. 1 is a sectional view of an embodiment of a heat generating container for a microwave oven according to the present invention. This microwave oven container is for baking bread. The heating container for a microwave oven comprises a container part 12 and a lid 13.

The container portion 12 includes an outer wall plate 14 made of ferritic stainless steel and an inner wall plate 15 made of aluminum. The container 12 is a press-molded clad material of ferritic stainless steel and aluminum. Examples of ferritic stainless steel include SUS430, SUS444, SUH21, SUH446. The thickness of ferritic stainless steel is preferably 0.2 to 0.6 mm. This is because the strength becomes weaker when the thickness is 0.2 mm or less,
This is because when the thickness is 0.6 mm or more, the heat capacity becomes large and the temperature rise slows down. JIS1100 is available for aluminum. The thickness of aluminum is preferably 0.2 to 1.0 mm. This is because the strength becomes weak when the thickness is 0.2 mm or less, and the processing becomes difficult when the thickness is 1.0 mm or more. A more detailed structure of the container portion 12 will be described with reference to FIG. 2A.

FIG. 2A is an enlarged view of a portion indicated by an arrow A in FIG. A ferrite film 16 having a thickness of 100 μm is formed on the surface of the outer wall plate 14 made of ferritic stainless steel.
The method of forming the ferrite film 16 will be described below. First, a raw material having the composition shown in Table 1 on page 8 is mixed with a thinner composed of 20% xylene, 70% terpene, and 10% toluene to prepare a mucus containing ferrite and the like. Then, this mucus is sprayed onto the outer wall plate 14 made of ferritic stainless steel, and it is baked at 280 ° C. for 20 minutes to form the ferrite film 16. That is, one coat and one bake finish.

On the surface of the aluminum inner wall plate 15 and the ferrite film
A surface protective film 17 is formed on each surface of the 16. The surface protective film 17 is formed as follows. First 9
A raw material having the composition shown in Table 2 on the page is mixed with a thinner composed of 20% xylene, 20 butanol and 60% toluene to prepare a mucus. The mucus on the surface of the inner wall plate 15 and the ferrite film
Formed by spraying each onto 16 surfaces and firing it. Since the surface protection film 17 is non-adhesive, it prevents the food from sticking to the microwave heating container. The surface protective film 17 also has a function of preventing the ferrite of the ferrite film 16 from being oxidized.

The lid 13 is made of aluminum. The detailed structure of the lid 13 will be described with reference to FIG. 2B. FIG. 2B is an enlarged view of a portion indicated by an arrow B in FIG.

As shown in FIG. 2B, a 100 μm-thick ferrite film 16 is formed on one surface of the aluminum lid 13. The side where the ferrite film 16 is formed is outside the heat generating container for the microwave oven. A surface protective film 17 is formed on the other surface of the lid 13 and the surface of the ferrite film 16. The method for forming the ferrite film 16 and the surface protective film 17 is the same as that for the container portion 12. The lid 13 is not provided with ferritic stainless steel for the following reason. As shown in FIG. 4, in a normal microwave oven, there is a high frequency irradiation port 3a above the high frequency irradiation chamber 3. Therefore, since a high frequency is directly applied to the lid 13, if a ferrite stainless steel plate is provided on the lid 13, the temperature of the lid 13 rises more than necessary and uneven baking of bread occurs. However, when aluminum and ferritic stainless steel are used for the lid 13, the lid 13 and the container 12 can be heated to the same temperature by setting the thickness of the ferrite film 16 to 60 to 80 μm.

The heat generation test of the container was conducted using seven kinds of containers shown in Table 3 on page 12. The test is to put the container in a single-function microwave oven with an output of 500 W, heat the container by high frequency, and measure the heat generation temperature every time. Table 3, A, B, C
Is the container of the present invention, and D is the thickness of the ferrite film formed on the container of the present invention is the same as the thickness of the conventional ferrite film. E is a conventional container. F is a container made of aluminum only. G is a container made only of aluminum and ferritic stainless steel. The test results are shown in FIG.

In the containers A, B, and C of the present invention, the film thickness of the ferrite film is 100 μm, but the containers generate heat up to 200 ° C., which is the temperature required for baking bread.

Further, in cases A and B in which the thickness of ferritic stainless steel is thin, it takes less time to heat the container to 200 ° C. than in case C in which the thickness of ferritic stainless steel is large. Therefore, thinner ferritic stainless steel enables faster cooking.

Further, D in which the ferrite film having the same thickness as the conventional example is formed on the container of the present invention can generate heat up to 300 ° C. Therefore, the container of D can be used for those that require temperature for cooking.

Although aluminum is used as the inner wall plate in this embodiment, the present invention is not limited to this, and copper and copper alloys (brass, bronze, brass) can be used as the inner wall plate.

Further, in this embodiment, the container is formed by using the clad material made of aluminum and ferritic stainless steel, but the present invention is not limited to this, and the ferritic stainless steel container and the aluminum container are separately provided. It may be manufactured and manufactured by press-fitting an aluminum container into a ferritic stainless steel container.

[Effect] The heat generating container for a microwave oven according to the present invention heats the container by an outer wall plate made of a plate material that generates heat by high frequency heating and a film formed on the surface of the outer wall plate by high frequency heating.

Therefore, since the outer wall plate also generates heat, the thickness of the heat generating film formed on the surface of the outer wall plate can be made thinner than before. Therefore, the heating film forming step is required only once. Therefore, the probability that mucus containing the heat-generating material will run down the surface of the outer wall plate and cause a poor appearance will be much lower than in the prior art. In addition, production efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a microwave oven heat-generating container which is an embodiment of the present invention. FIG. 2A is an enlarged view of a portion indicated by an arrow A in FIG. FIG. 2B is an enlarged view of a portion indicated by an arrow B in FIG. FIG. 3 is a diagram showing a graph of experimental results of the present invention. FIG. 4 is a sectional view of a microwave oven on which a heat generating container for a microwave oven is placed. FIG. 5 is a cross-sectional view of a conventional heating container for a microwave oven. In the figure, 12 is a container part, 13 is a lid, 14 is an outer wall plate, 15 is an inner wall plate, and 16 is a ferrite film.

Claims (1)

[Claims] 1. A heating container for a microwave oven that generates heat by high frequency heating, which is formed of a plate material having good thermal conductivity, and an inner wall plate that constitutes an inner wall portion of the container, and a plate material that generates heat by high frequency heating. A heat generating container for a microwave oven, comprising: an outer wall plate located on the outer surface of the inner wall part; and a film formed on the surface of the outer wall plate to generate heat by high frequency heating.