JPH0445656Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a food heating container for use in a microwave oven, and a food heating plate that can be attached to an existing container to increase the heating efficiency of the container in a microwave oven. More specifically,
To provide a food heating container and a food heating plate that are highly durable and can withstand thermal shock during heat generation.

[Conventional technology]

Utility Model Application No. 62-171783 by the same applicant exists as a container that can make heating of foodstuffs in a microwave oven more efficient and can diversify heating modes. These containers, such as pots, pots, plates, and pots, are made using ceramic materials mixed with ferrite, and when used in a microwave oven, the microwaves can directly heat the food. In addition, due to the radio wave absorption ability of ferrite, the container itself generates heat, and in addition to the direct heating by the microwaves mentioned above, external heating by heat conduction from the container is also possible, increasing heating efficiency and making it possible to brown the food. This made it possible to diversify food preparation methods.

[The problem that the idea aims to solve]

However, in this idea, the heat generated by the container itself is achieved by the radio wave absorption ability of the ferrite, but the temperature rise due to this heat generation is extremely rapid.
There was a risk that thermal shock would act on the container, accelerating its deterioration and reducing its durability. The present invention has been made in view of the current situation, and the object is to provide a food heating container with excellent durability that does not undergo thermal shock even when the container itself suddenly rises in temperature due to the radio wave absorption ability of ferrite. This is the first objective, and by applying the technology developed to achieve this objective to existing containers, we also provide a means to increase heating efficiency when using existing containers in microwave ovens. It is.

[Means to solve the problem]

A heating container that solves this problem is characterized in that part or all of the container for storing food is made of a material made of porous ceramics mixed with ferrite. In particular, when the ferrite compounding portion is provided in a part of the container, it is preferable that this portion be in the lower half of the container.

Furthermore, a food heating plate in which the above-mentioned technology is applied to an existing container is characterized in that the plate, which can be attached to a suitable location on the outer surface of a container containing food, is made from a material made of porous ceramics mixed with ferrite. .

[Effect]

Since the food heating container having such a structure uses porous ceramics, the air layer within the porous ceramics exerts a buffering effect to suppress thermal shock. Therefore, even when the temperature of a container that has absorbed microwaves increases rapidly, the container will not deteriorate due to thermal shock, and the durability of the container can be increased. Furthermore, when the container is taken out of the microwave oven, the high-temperature air present in the air layer exerts a heat-retaining effect, preventing the food from cooling down.

Furthermore, when the ferrite-containing part is placed in the lower half of the container, the lower half of the container becomes hotter than the upper half, and convection occurs within the container, eliminating the uneven heating characteristic of microwave oven heating and heating the entire food. uniform heating is possible.

Furthermore, by creating a food heating plate made of porous ceramics mixed with ferrite and attaching it to an appropriate location on the outer surface of an existing container, it is possible to easily impart a heat generating function to the existing container. Moreover,
Since the plate is attached to the outside of the container, even if the plate surface is painted, the paint will not get mixed into the food.

〔Example〕

Next, details of the present invention will be explained based on illustrated embodiments. FIG. 1 shows an embodiment of the food heating container of the present invention, which is applied to an earthenware pot with a lid. The earthenware pot of the present invention, like the conventional earthenware pot, is composed of a main body 1 and a lid 2, and the main body 1 and the lid 2 are made of porous ceramic mixed with soft ferrite. Ceramics include quartz,
It is possible to use general ceramic materials such as feldspar, alumina, and zirconium, and ceramic clay, which is an inorganic material for making ceramics and porcelain.
As the ferrite, soft ferrite such as nickel zinc ferrite and manganese zinc ferrite can be used.

Porous ceramics can be produced using various conventional methods, such as adding a foaming agent or adding a material that is burnt out by the heat during firing. When creating this porous ceramic, ferrite powder is also mixed in at the same time, and this is fired into a predetermined shape to obtain an earthenware pot.

In addition, the amount of soft ferrite added is 2 to 20% by weight.
Set within the range. The reason why the blending amount is 2% by weight or more is because if it is less than this, the effect of concentrating microwaves in a microwave oven is low and no heat generation effect can be expected. Additionally, in general, when the amount of ferrite added increases, rapid heat generation occurs, leading to concerns about thermal shock, but since the present invention uses porous ceramics,
The air layer has the function of buffering thermal shock. Therefore, it is not necessary to set the upper limit of the amount of ferrite mixed in consideration of thermal shock. In this example, the upper limit of the ferrite content was set at 20% by weight because if it exceeds 20% by weight, the calorific value will be excessive and it will be unsuitable for use as a container. This is because the effect is relatively weakened.

In addition, if the amount of soft ferrite is too large, especially when used with the lid 2 attached, most of the microwaves will be absorbed by the lid 2, and the direct heating of the food, which is the original function of the microwave oven, will be interrupted. Function deteriorates significantly. From this point of view as well, the amount of ferrite blended is preferably 20% by weight or less.

FIG. 2 shows another embodiment of the present invention. In this embodiment, as described above, the entire earthenware pot is not made of porous ceramics containing ferrite (hereinafter referred to as ferrite-containing porous ceramics), but only the lower half 3 of the pot body 1 is made of porous ceramics containing ferrite. It is made of ceramics and has the same structure as a conventional clay pot. In this case, the microwaves are absorbed intensively in the lower half 3 of the earthenware pot, and as a result, the temperature of this part increases intensively, generating convection within the pot body, making it possible to uniformly heat the food. 2 and the upper half of the pot body 1 do not contain ferrite, so the microwaves incident on them pass through without attenuation and directly heat the food.
Both the original heating method of a microwave oven and heating by heat conduction from an earthenware pot can be effectively utilized.

Further, numeral 4 in the figure indicates a bottom raising stand made of ceramics that does not contain ferrite and is provided to prevent the bottom of the earthenware pot, which is heated to a high temperature, from coming into direct contact with the turntable of the microwave oven.

By the way, when exposed to microwave irradiation from a microwave oven, the portion made of ferrite-containing porous ceramics heats up to about 600°C, whereas the portion not containing ferrite does not generate heat. Therefore, problems of thermal shock and cracking due to the difference in thermal expansion may occur at the joint between these two parts. In this embodiment, as shown in Fig. 3 A and B, the joint part is made tapered to increase the contact surface, and as shown in Fig. 3 C, the blending amount of ferrite is gradually changed near the boundary between the two. addresses these issues by eliminating the boundaries between the two.

Although the above description has been made regarding earthenware pots, the present technology can be applied to other objects as long as they can contain food, such as plates and pots.

The food heating container constructed as described above was made using a material made of porous ceramics mixed with ferrite, so when the container was heated by irradiation with microwaves, an air layer formed in the ceramics was created. This provides a food heating container that can alleviate thermal shock, prevent cracks, etc. from occurring in the container, and has excellent durability.
Moreover, after the food is taken out of the microwave, the high-temperature air stored in the air layer has a heat-retaining effect, which prevents the food from cooling down. Since the food is heated synergistically by direct heating of the food by absorption of microwaves and heat conduction from the heated container, heating efficiency can be increased.
In addition, since it can be browned, it can be applied to various dishes.

What is shown in FIG. 4 is an explanatory diagram showing an example of the food heating plate which is the second invention.
A case where a disc-shaped food heating plate 5 is created using ferrite-containing porous ceramics, and the food heating plate 5 is removably fitted into a raised bottom space 7 formed at the bottom of a cup 6 of instant noodles in a cup. It is. Since the cup 6 is made of synthetic resin, the amount of ferrite added must be smaller than in the case of the earthenware pot described above, so that the cup 6 does not melt even when heat is generated. Since this plate is attached to the outside of the container and does not come into direct contact with the food, the surface can be painted. The method of using this plate is to fit it onto the bottom of any cup of instant noodles, then fill the cup with water and heat it in a microwave. After use, remove it and store it. It is something to do.

In the above embodiment, only the case where it is attached to a cup-shaped instant noodle container is described, but it is also possible to apply it to a cup-shaped instant noodle container having a raised space. It can also be applied to

The food heating plate provided in this way can be simply attached to an existing container, and in addition to directly heating food using microwaves, which is the original heating method of microwave ovens, it also has the ability to heat food through heat conduction from the container. Therefore, heating efficiency when using a microwave oven can be improved. Particularly when attached to the bottom of an existing container, the bottom of the container can be heated centrally and convection can be generated inside the container, making it possible to uniformly heat the food.

[Effect of idea]

The food heating container of the present invention was created using a material made of porous ceramics mixed with ferrite, so when this container is used in a microwave oven, in addition to directly heating the food with the microwave,
Heating can also be performed by heat conduction from the heated container, which not only significantly enhances the heating effect, but also enables various uses such as browning, making it possible to apply it to various dishes.

Since porous ceramics are used, the air layer acts to alleviate thermal shock when the temperature rises rapidly, so the container does not deteriorate due to thermal shock, allowing for highly durable food heating. It can be a container. Moreover, the air layer can also function as a heat-insulating layer, which prevents food from cooling down after it is removed from the microwave.
Moreover, since it is porous, it is lightweight and easy to handle.

In addition, when the lower half of the container is made of porous ceramics containing ferrite, the temperature of the lower half of the container increases intensively, making it possible to generate convection inside the container, which increases the temperature of the surface layer of the food and Foods can be heated evenly by eliminating the negative effects of direct heating by microwaves, which tend to concentrate on water-containing parts.

In addition, the second invention, the food heating plate, was made using porous ceramics containing ferrite and was able to be attached to an appropriate location on the outside of an existing container, so it could be attached to an existing container as appropriate. It becomes possible to add a heat generation function, and in addition to the direct heating of foodstuffs using microwaves, which is the original heating method of microwave ovens, it becomes possible to add a heating function by heat propagation from the container.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the food heating container according to the present invention, Fig. 2 is a sectional view showing another embodiment of the food heating container, and Fig. 3 A, B, and C are those in which ferrite is blended. FIG. 4 is an enlarged cross-sectional explanatory view showing a method of joining porous ceramics and ceramics not containing ferrite, and FIG. 4 is an explanatory view showing an example of the food heating plate of the second invention. 1... Pot body, 2... Lid, 3... Lower half, 4...
...Bottom-raising stand, 5...Food heating plate, 6...Cup, 7...Bottom-raising space.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A food heating container in which part or all of the container for storing food is made of a material made of porous ceramics mixed with ferrite. 2. The food heating container according to claim 1, wherein a part or all of the lower half of the container for storing food is made of a material made of porous ceramics mixed with ferrite. 3. A food heating plate that can be attached to an appropriate location on the outer surface of an existing food container and is made of porous ceramics mixed with ferrite.