JPH03151917A - Safety container against overturn for heating microwave oven - Google Patents

Abstract

PURPOSE:To prevent overturn of a container while it is heated and prevent discharges between it and a turntable by providing a microwave regulating layer on the bottom of the container formed in a prescribed cylinder for regulating the amount of microwaves having a prescribed longest length. CONSTITUTION:A container 1 is formed in a cylinder having a bottom surface of a circle the diameter of which is less than 60mm, an oblong the longer diameter of which is less than 60mm, or a polygon the diagonal of which is less than 60mm, and a height higher than 60mm. A microwave regulating layer 3 is arranged on the bottom surface 2 of the container 1 for regulating the amount of microwaves having a longest length of shorter than 55mm and invading into the container through the bottom part. The layer 3 is made of such a composition as silver paste obtained by mixing powder of metal such as silver, aluminium, nickel or iron with a film forming substance such as a synthetic resin. The layer 3 is preferably formed in the same shape as the bottom surface 2 so as to fit therewith. The layer 3 may be laid partially on the bottom surface 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a container for preventing m1 from falling over when heated in a microwave oven.

[Prior Art] When conventional containers are heated in a microwave oven, there are many accidents in which they fall over and the contents spill out. At present, the cause is unknown and unexplained, and there is currently no way to prevent it.

[Problems to be Solved by the Invention] Conventional containers, especially those containing liquid components and solid components, tend to tip over and spill their contents when heated in a microwave oven. However, containers that require heating in a microwave oven contain both liquid and solid components in 100% of the cases, and this accidental tipping is therefore an extremely serious problem.

The object of the present invention is to provide a container that solves this problem and does not fall over when heated in a microwave oven.

[Means for Solving the Problem] The present invention provides: 1. A polygonal base having a circular shape with a diameter of 60 arms or less, an elliptical shape with a major axis of 60 arms or less, or a polygonal shape with a diagonal length of 60 arms or less, and a polygonal shape of 6011II+ or more A tip-over prevention container for heating in a microwave oven, which is formed by disposing a microwave adjustment layer on the bottom of a cylindrical container having a height to adjust the amount of microwaves that enter the container from the bottom, the longest part of which is 55 degrees or less. .

2. The microwave oven heating phase change m1 prevention container according to claim 1, wherein the microwave adjustment layer for adjusting the amount of microwaves disposed on the bottom portion is a metal film.

3. The anti-tip container for heating in a microwave oven according to claim 1, wherein the microwave adjusting layer disposed on the bottom portion and adjusting the strength of the microwave is a metal film having an insulating layer on the outer surface.

4. The microwave heating device according to claim 1, wherein the microwave adjustment layer disposed on the bottom portion for adjusting the amount of microwaves is a layer formed of a composition containing metal powder mixed with synthetic resin. Anti-tip container.

5. The microwave heating device according to claim 1, wherein the microwave adjustment layer disposed on the bottom portion for adjusting the amount of microwaves is a metal film disposed inside the synthetic resin film forming the bottom portion. Anti-tip container.

6. The microwave heating inverter according to any one of claims 1 to 5, wherein the microwave adjustment layer arranged on the bottom part and adjusting the amount of microwaves is arranged over the entire bottom part. prevention container.

7. The microwave oven according to any one of claims 1 to 5, wherein a microwave adjustment layer for adjusting the amount of microwaves is partially disposed on the bottom surface. Anti-tip container for heating.

8. The microwave oven according to claim 7, wherein the microwave adjustment layer arranged on the bottom part and adjusting the amount of microwave is arranged in a continuous or discontinuous ring shape around the periphery of the bottom part. Heating phase change m1 prevention container.

9. The microwave heating phase change m according to any one of claims 1 to 9, wherein the metal forming the microwave adjustment layer is one or more metals selected from aluminum, iron, silver, and nickel. ! prevention container.

10. The container is made of waterproof paper, plastic or glass,
11. The anti-tip container for heating in a microwave oven according to any one of claims 1 to 10, which is made of a ceramic product such as ceramics.

As a result of various studies on the causes of the above-mentioned falls, the inventor of the present invention found that the cause was the heating of solid components stored in containers made of waterproof paper, plastics, or ceramic products such as glass and ceramics. I figured it out. In other words, when a container of ceramic products such as waterproof paper, plastics, glass, or ceramics containing liquid and solid components is heated in a microwave, the electric field generated by the microwave becomes very strong at the bottom, so that the solids that have sunk to the bottom are heated. Ingredients are heated strongly.

The liquid contained in the solid component then evaporates rapidly.

Therefore, the solid component bursts and becomes large? ! When a container is hit with an I-shot, especially lightweight containers jump up by nearly 100 points.

This causes the container to tip over.

The shape of the container has a large influence on the occurrence of such overturning. That is, there is a close relationship between the bottom area of the container and the height of the container. The bottom area of the container is related to the strength of the electric field generated by microwaves at the bottom of the container, and the height of the container determines the center of gravity of the container and is related to stability.

Containers with a large base area and low height have a lower center of gravity and are more stable, so the electric field at the bottom is stronger and the container is less likely to tip over even if the solid component ruptures.
Containers with a capacity of around 80 cal are usually 60 mm or less in bottom diameter and 60 mm or more in height for ease of use and miniaturization. Containers of this size are extremely prone to tipping over when heated in a microwave oven, and the strong demands on the shape of the containers make the problem of tipping over in microwave ovens even more serious.

This overturning of square-sized containers is not limited to cylindrical containers; even oval-shaped containers with a major axis of 60 mm or less and a height of 60 mm or more will overturn, and polygonal containers with diagonals of 60 mm or more will also overturn.
If the height is less than 0 and the height is 60 Iu1 or more, it will fall over in the same way.

The inventor of the present invention has conducted various research in order to prevent such rapid heating of the solid components at the bottom of the container and to prevent the solids from bursting.As a result, the inventor provided an adjustment layer at the bottom of the container to adjust the penetration of microwaves. By adjusting the amount of microwaves and changing the electric field strength and pattern at the bottom of the container when heated in a microwave oven, we succeeded in suppressing the heating rate of the solid components at the bottom and completed the present invention.

The problem here is the phenomenon of discharge between the adjustment layer and the turntable of the microwave.

A metal film is the most effective adjustment layer for adjusting the penetration of microwaves, but when a metal film is heated in a microwave oven, electrical discharge often occurs between it and the turntable of the microwave, and this electrical discharge damages the insulation of the turntable. Accidents may occur in which the paint film is destroyed or the container melts.

The present inventor has clarified that the discharge between the metal film and the microwave turntable is deeply related to the size of the adjustment layer that adjusts the penetration of microwaves at the bottom of the container.0 Based on the research of the present inventor And, an adjustment layer with a length of 55 cities or more will always discharge between it and the turntable.

This is the reason why, in the present invention, the size of the adjustment layer for adjusting the penetration of microwaves is set to 55 mm or less at the longest portion.

When a conductive substance is introduced into the microwave region, an eddy current is generated in the conductive substance, and depending on the degree of conductivity, it absorbs the microwave and generates heat. A conductive material having a surface electrical resistivity of 11 to 5000 Ω/mouth absorbs microwaves and generates heat. When such a material is used as a microwave adjustment layer and placed at the bottom of a container, it generates heat and the solid material at the bottom of the container bursts due to the heat, causing the container to overturn.

Therefore, a material having a surface electrical resistivity of 1 Ω/mouth or less is suitable as a material that can be used as the microwave adjustment layer.

In the present invention, the adjustment layer arranged at the bottom of the container to adjust the penetration of microwaves is a metal film such as silver, aluminum, nickel, iron, etc., such as metal foil, or a laminated film made by laminating these metal foils with a plastic film. is the most preferred, but an adjustment layer formed of a composition such as silver paste in which these metal powders are mixed with a film-forming substance such as a synthetic resin is also effective. Metal plating film is also suitable, but metal plating film is also suitable.
Since the film may act as a heating element depending on its thickness, for example, in the case of an aluminum vapor-deposited film, the film thickness is preferably 250 Å or more.

In the present invention, various phenomena occur depending on the shape of the adjustment layer arranged at the bottom of the container to adjust the penetration of microwaves.

The phenomenon caused by the shape of the microwave adjustment layer is as follows.
■The degree of microwave reflection, ■Heat generation due to electric field concentration, etc.

When a metal substance is introduced into the microwave region, the degree of microwave reflection varies depending on the size of the metal substance, and the greater the reflection, the greater the electric field concentrated at the edge of the metal substance, and the greater the risk of electric discharge.

The size of the adjustment layer that can be used as the microwave adjustment layer of the container of the present invention without the risk of discharge is 55 cm or less in maximum length. The longest length means the diameter for a disc, the length of the diagonal for a polygon, the major axis for an ellipse, the outer diameter for a ring shape, and the respective shape for a C-shape or spiral shape. This is the open length.

It is preferable that the adjustment layer be formed at the bottom of the container in approximately the same shape as the bottom, but as mentioned above, it may be arranged partially.For example, it may be arranged in a ring shape. They may be arranged concentrically.

Further, the adjustment layers may be arranged in a spiral shape, in a C-shape or a lattice shape, linear adjustment layers may be arranged in parallel, or radially.

However, in the case of a C-shape, ring-shape, or rectangular shape, the width (
If the short side (in the case of a rectangle) is less than 5, the conductive material itself may generate heat even if the surface electrical resistivity is less than 1 Ω/mm.
There are problems such as electric field concentration at the edges, causing electrical discharge and heating of the container material near the edges, so when using adjustment layers with these shapes, it is desirable to have a width of 6 cm or more.

Since the electric field is strongest at the periphery of the bottom, it is preferable to place the adjustment layer at the bottom of the container to adjust the penetration of microwaves. Since the electric field at the periphery of the bottom becomes stronger due to the penetration of microwaves from the side surface of the rising portion of the bottom portion, it is preferable to provide the microwave on the side surface of the rising portion of the bottom portion as well.

Methods for arranging an adjustment layer to adjust microwave penetration at the bottom of the container include pasting a metal film in a predetermined shape, vapor deposition, or mixing metal powder with a film-forming substance such as synthetic resin. Appropriate means such as coating with a substance may be employed. In addition, when the container is formed from a synthetic resin film, it is possible to simultaneously form the container by using a film in which metal powder has been placed in advance on the bottom periphery, and preferably on the bottom periphery and the portions forming the bottom rising side surfaces. An adjustment layer can also be formed.

In either case, the important thing is that when forming an adjustment layer on the bottom of the container that has almost the same shape as the bottom, the diameter, major axis, or diagonal length of the adjustment layer must be 55mm or less, and that the adjustment layer is partially arranged. In this case, the longest part must be 55 meters or less.

An adjustment layer with a length of 55 cm or more always causes discharge between it and the turntable.

Note that since the electric field is strong at the ends of the adjustment layer, it is desirable to arrange an insulating layer.

[Function] The inventor of the present invention considers the following as to why this naked phenomenon occurs when a liquid component and a solid component coexist.

Even when only a liquid component is contained, when heated in a microwave oven, the electric field generated by the microwave becomes very strong at the bottom, so the liquid component at the bottom is heated strongly. However, since it is a liquid, convection occurs and heat conduction occurs smoothly, so there is no bumping, and no large impact occurs, so the container does not fall.

However, when a liquid component and a solid component coexist, the liquid component and solid component at the bottom are heated strongly, similarly to heating in a microwave oven. Unlike the liquid component, the heat of the solid component can only be transferred to other parts by conduction, so it is difficult to diffuse the heat of the solid component smoothly.

As a result, the temperature of the solid component at the bottom rises rapidly, so that the liquid contained in the solid component at the bottom rapidly vaporizes and the solid component ruptures. The impact generated by this rupture causes the container to topple over.

Surprisingly, at this time, the liquid component in the upper part is still sufficiently heated and has a temperature of about 50 to 60°C at most.

The occurrence of such non-uniform heating will be explained with reference to FIG. 27.

Figure 27 shows a plastic cup-shaped container with a bottom diameter of 47mm and a height of 100+ua+ containing corn soup (
Solids: Contains 60 wt% corn) and microwave oven (NE-M340.500W manufactured by Matsushita Electric Industrial Co., Ltd.)
The temperature-time curves of liquid and solid matter are shown when they are heat-treated on a glass turntable. For example, when the liquid temperature is 38°C after 20 seconds, the temperature of the solid is 100°C. Later, when the temperature of the liquid is 50°C, the temperature of the solid material becomes 120'C, and it is understood that the water in the solid material rapidly evaporates and the solid material ruptures.

Next, we will show the relationship between heating temperature and time depending on the position in the container, by listing some solid substances in the seed part.The liquid juice is water.

Table 1 It is understood that it is necessary to adjust the amount of microwave penetration to prevent the electric field at the bottom from becoming too strong.

Next, in order to explain the operation of the present invention in an easy-to-understand manner, the problem of falling will be specifically explained using several experimental examples.

Experimental Method (Length of Microwave Adjustment Layer and Overturning of Container) On the outside of the bottom of a plastic cup-shaped container with a bottom diameter of 47 am and a height of 100 mm, a disc-shaped aluminum foil of various diameters and a thickness of 15 μm was placed. A laminate of 25 μm polyethylene terephthalate film was provided, and 180 ml of commercially available corn cream soup (solid content: 10 g of corn) was prepared.
) and microwave oven (manufactured by Matsushita Electric Industrial Co., Ltd., N
E-M340.500W glass turntable) was used for heat treatment, and the relationship between the overturning of the container and the diameter of the disc-shaped metal foil was investigated.

From these test results, in order to prevent the container from tipping over, it is necessary to prevent the bottom of the container from falling when heated in a microwave oven. A laminate of aluminum foil with a thickness of 15 μm and polyethylene terephthalate film with a thickness of 25 μm in a disc shape of various diameters was provided, water was injected as the contents, and the mixture was heated in a microwave oven (Matsushita Electric IA Shikikai, tta HN E -T
50.500 W gold! The turntable was heat-treated using a turntable (If'-n table), and the presence or absence of discharge between the turntable and the metal foil was examined.

Table 3 Has the problem been solved to prevent falls by adjusting the microwave in this way?It is not practical to use it alone; in other words, it does not solve the problem of electric discharge between the adjustment layer and the microwave turntable. It has to be.

Next, the problem of this discharge will be specifically explained using an experimental example.

Experimental Method (Microwave Adjustment Layer Length and Discharge) According to the research conducted by the present inventors, the discharge between the metal film and the microwave turntable is caused by the length of the microwave adjustment layer at the bottom of the container that adjusts the microwave penetration. There is a deep relationship with the size, and an adjustment layer with a length of 55 mm or more will always cause a discharge between it and the turntable.

It is understood that the container of the present invention solves both the discharge problem and the overturning problem.

Next, it will be specifically explained that the constituent elements of the present invention are integrally combined with each other and exhibit a synergistic effect.

For easy explanation, the shape of the container, the shape and type of the microwave adjustment layer, the type of contents, and the results of the Hiei test regarding overturning of the container are shown.

(A) Relationship between container shape and container overturning Using a polypropylene film with a thickness of 1.51 mm, containers of various shapes were formed by normal vacuum forming, and water and corn (6W%) were each added as the contents. The container was filled to 80% of its internal volume and heated at 500 W for 2 minutes using a commercially available microwave oven (Toshiba ER-225500W glass turntable manufactured by Toshiba Corporation). Table 4 shows the results.
Shown below.

Table 4 (The square container shown in 3 has 79 openings on one side) From this test, containers with a bottom diameter of 60mm or less and a height of 60+wm or more 5.7.
It can be seen that 8.9 is converted to m1.

It is understood that a container 4 with a bottom diameter of 60 cm or more even if the height is 60 IWII or more, and a container 10 with a bottom diameter of 60 cm or less but a height of 60 cm or less are difficult to tip over. Containers 5.7.8.9 with a bottom diameter of 60mm or less and a height of 6011II or more are the most sought after containers.

(B) Relationship between the shape of the microwave adjustment layer and the overturning of the container.As a container, the diameter is 63! lfI, using a polypropylene container with a bottom diameter of 53 + - m and a height of 87 m, cut a laminated film of 12μ polyethylene terephthalate film and 9μ aluminum foil into various shapes as a microwave adjustment layer on the bottom and apply adhesive. Pasted. In this container, 185 g of commercially available corn soup (solid content: corn 6 wt%)
The shape of the microwave adjustment layer and the overturning of the container were investigated using a commercially available microwave oven (National NE-M340 500W glass turntable manufactured by Matsushita Electric Industrial Co., Ltd.). The results are shown in Table 5.

(Margin below) Table 5 From this test, it can be seen that microwave adjustment layers of various shapes have a fall prevention effect as long as the longest length is 55 mm or less.

(C) Relationship between the type of microwave adjustment layer and container overturning A polypropylene container with a diameter of 63 mm, a bottom diameter of 47 mm, and a height of 96 mm was used as the container, and the bottom was made of various materials with a diameter of 4 mm.
A container provided with a circular microwave adjustment layer of 5 mm was used. Pour 185 g of commercially available corn soup (solid content: 6 wt% corn) into this container, and use a commercially available microwave oven (National NE-M340 500W manufactured by Matsushita Electric Industrial Co., Ltd.).
The type of microwave adjustment layer and the fPI of the container were investigated using a glass turntable. The results are shown in Table 6.

(Margin below) Table 6 [Note] The conductive silver paste in 2 is a microwave TA layered layer of 5μ conductive silver paste formed on a 12μ polyethylene terephthalate film, which is attached to the bottom of the container with an adhesive. This is an example.

The aluminum powder in No. 3 is an example in which a microwave:A layered sheet formed by mixing metal aluminum powder and polypropylene and having a thickness of 250 μm is attached to the bottom of the container using an adhesive. The content of metallic aluminum powder is 75 wt%.

The aluminum vapor-deposited film in No. 4 is an example in which a microwave adjustment layer formed by forming a metal aluminum vapor-deposited film of O11μ on a polyethylene terephthalate film of 12μ is adhered to the bottom of the container with an adhesive.

Iron foil No. 5 is an example in which a microwave adjustment layer formed of a laminate of a 12 μm polyethylene terephthalate film and a 15 μm iron foil is adhered to the bottom of the container with an adhesive.

The nickel plating film No. 6 is an example in which a microwave adjustment layer formed of a 15 μm polycarbonate film and a 20 μm nickel plating film is attached to the bottom of the container using an adhesive.

This test shows that various microwave conditioning layers are effective in preventing falls.

[Example] The invention will now be described in detail with reference to the drawings.

Practical tests are also included for representative examples.

Example 1 Fig. 1 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and Fig. 2 is a front view of the bottom of this container. , is a polypropylene container with a height of 87ffiw1, and has a microwave adjustment layer attached to the bottom with an adhesive. 2 is a container bottom with a 12μ polyethylene terephthalate film and a 9μ aluminum foil as the microwave adjustment layer. A disk-shaped microwave adjustment layer 3 having the same diameter as the bottom of the laminated film is disposed. 4 is an upper opening.

Add commercially available corn soup (solid content: 6 corn) to this container.
wt%) 185g, and placed in a commercially available microwave oven (National NE-M340 500W manufactured by Matsushita Electric Industrial Co., Ltd.).
The mixture was heated at 500 W for 2 minutes using a glass turntable.

There was no overturning of the container and the contents were sufficiently heated.

Embodiment 2 FIG. 3 is an embodiment showing a front cross-section of a roll prevention container of the present invention, and FIG. 4 is a front view of the bottom of this container.
In the figure, 1 shows a polypropylene container with a height of 96 cm, a diameter of 63 cm, and an outer diameter of 47 cm, and the inside is convex upward with 2 cm, and the outer diameter of the convex part is 37 cm. is the bottom of the container, and the 12μ polyethylene terephthalate film is
A disk-shaped microwave adjustment layer 3 with a diameter of 47 cm is provided by adhering a vapor-deposited layer film with a 1 μm aluminum vapor-deposited film to the convex portions using an adhesive.

4 is an upper opening.

Put 185 g of commercially available meat sauce (solid content: beef, carrot, pork 6wt%) into this container, and microwave it commercially (National NE-M340, manufactured by Matsushita Electric Industrial Co., Ltd.).
was heated for 2 minutes at 500W.

There was no overturning of the container and the contents were sufficiently heated.

Embodiment 3 Fig. 5 is an embodiment showing a front cross section of the anti-overturn container of the present invention, and Fig. 6 is a front view of the bottom of this container. A polypropylene container with a diameter of 3rm is shown, and 2 is the bottom of the container.
It was formed by pasting a laminated film of polyethylene terephthalate film and 9μ aluminum foil with adhesive.
A disk-shaped microwave adjustment layer 3 with a diameter of 50 cm is provided.

4 is an upper opening.

Add commercially available corn soup (solid content: 6 corn) to this container.
wt%) and heated for 2 minutes at 500 W using a commercially available microwave oven (National NE-M340, manufactured by Matsushita Electric Industrial Co., Ltd.).

There was no overturning of the container and the contents were sufficiently heated.

Embodiment 4 Fig. 7 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and Fig. 8 is a front view of the bottom of this container. 53 indicates a polypropylene container, and 2 is the bottom of the container where 12μ
A polyethylene terephthalate film with an outer diameter of 50 mm and a laminated film of 15 μm iron foil are bonded together with an adhesive.
A microwave adjustment layer 3 in the form of a donut-shaped disk having an inner diameter 30 at am is disposed. 4 is an upper opening.

Add commercially available corn soup (solid content: 6w corn) to this container.
t%), and using a commercially available microwave oven (National NE-M340 manufactured by Matsushita Electric Industrial Co., Ltd.),
Heated at 00W for 2 minutes.

There was no overturning of the container and the contents were sufficiently heated.

Embodiment 5 FIG. 9 is an example showing a front cross section of the anti-overturning container of the present invention, and FIG. 10 is a front view of the bottom of this container.
In the figure, reference numeral 1 indicates a container, and reference numeral 2 indicates the bottom of the container, on which two concentric ring-shaped microwave adjustment layers 3 are disposed. 4 is an upper opening.

Embodiment 6 FIG. 11 is an embodiment showing a front cross section of the anti-overturn container of the present invention, and FIG. 12 is a front view of the bottom of this container. 1 in the figure indicates the container, and 2 indicates the bottom of the container A microwave adjustment layer 3 in the form of a small disk is partially disposed here. 4 is the upper opening.

Embodiment 7 Fig. 13 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and Fig. 14 is a front view of the bottom of this container. 53- shows a container made of polypropylene, 2 is the bottom of the container, where 12μ
A cross-shaped microwave adjustment layer 3 with a diameter of 10n+n and a length of 53 circles is provided, which is formed by adhering a polyethylene terephthalate film of 100 µm and an MHI film of 9 μm aluminum foil with an adhesive. 4 is an upper opening.

Add 1 commercially available corn soup to this container (solid content: 6w of corn)
t%), and using a commercially available microwave oven (National NE-M340 manufactured by Matsushita Electric Industrial Co., Ltd.),
Heated at 00W for 2 minutes.

There was no overturning of the container and the contents were sufficiently heated.

Embodiment 8 FIG. 15 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and FIG. 16 is a front view of the bottom of this container. 1 shows a polypropylene container with a height of 87 m, a diameter of 63 mm, and a bottom diameter of 53 ffwI, and 2 is a bottom part formed by pasting a plating film with a 20 μ nickel plating layer on a 12 μ polycarbonate film with an adhesive. A microwave adjustment layer 3 is provided in the inner circle of a ring-shaped plate having an outer diameter of 50B and an inner diameter of 40 boxes, in which a cross-shaped body formed of the same plating film and having a length of 10 cm and a length of 40 cm is arranged.

4 is an upper opening.

Put 185g of commercially available minestrone (solid content: potatoes, carrots, onions, tomatoes, cabbage, green peas, bacon 10wt%) into this container, and place it in a commercially available microwave oven (
Using National NE-M340 (manufactured by Matsushita Electric Industrial Co., Ltd.), it was heated at 500 W for 2 minutes.

There was no overturning of the container and the contents were sufficiently heated.

Embodiment 9 Figure 17 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and Figure 18 is a front view of the bottom of this container. Here, a microwave adjustment layer 3 formed in a grid pattern is disposed. 4 is the upper opening'.

Example 1O FIG. 19 is an example showing a front cross section of the anti-overturning container of the present invention, and FIG. 20 is a front view of the bottom of this container. A ring-shaped microwave adjustment layer 3 is disposed around the periphery. 4 is an upper opening. This embodiment is an example in which a microwave adjustment layer is provided at a portion where electrolysis is strongest.

Embodiment 11 FIG. 21 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and FIG. 22 is a front view of the bottom of this container. A ring-shaped microwave adjustment layer 3 is disposed at the peripheral edge and the rising portion of the wall. 4 is an upper opening. This embodiment is an example in which a microwave adjustment layer is provided at a portion where electrolysis is strongest.

Embodiment 12 FIG. 23 is an example showing a front cross section of the anti-overturning container of the present invention, and FIG. 24 is a front view of the bottom of this container. Here, a microwave adjustment layer 3 is provided that covers the bottom and the rising portion of the wall. 4 is an upper opening. This embodiment is also an example in which a microwave adjustment layer is provided in a portion where electrolysis is strongest.

Embodiment 13 Fig. 25 is an embodiment showing a front cross section of the anti-overturning container of the present invention, and Fig. 26 is a front view of the bottom of this container. The outside diameter is 47cm, and the inside is convex 5fl upwards, and the outside diameter of the convex part is 37mm.
2 shows a polypropylene container, and 2 is the bottom of the container.A film consisting of a 12μ polyethylene terephthalate film and a 5μ conductive silver film is attached to the convex part with an adhesive, and the outer wall of the container is A shallow, pot-shaped microwave adjustment layer 3 is disposed near the bottom and is adhered to a height of 5 degrees. 4 is an upper opening.

Put 185g of commercially available beef curry (solid content: beef, carrot, 30wt%) into this container, and place it in a commercially available microwave (
National NE-M340 manufactured by Matsushita Electric Industrial Co., Ltd.)
was heated for 2 minutes at 500W.

There was no overturning of the container and the contents were sufficiently heated.

Comparative Example 1 The same procedure as Example 3 shown in FIGS. 5 and 6 was carried out except that the microwave adjustment layer was not provided.

All the containers fell over and could not be heated.

Comparative Example 2 The same procedure as Example 4 was carried out except that the microwave adjustment layer was not provided.

All the containers fell over and could not be heated.

Comparative Example 3 The same procedure as Example 7 was carried out except that the microwave adjustment layer was not provided.

All the containers fell over and could not be heated.

Comparative Example 4 The same procedure as Example 8 was carried out except that the microwave adjustment layer was not provided.

All the containers fell over and could not be heated.

Comparative Example 5 The same procedure as Example 2 was carried out except that the microwave adjustment layer was not provided.

All the containers fell over and could not be heated.

Comparative Example 6 The same procedure as Example 13 was carried out except that the microwave adjustment layer was not provided.

All the containers fell over and could not be heated.

[Effects] As explained above, the present invention completely solves the problem of the container tipping over during heating in a microwave oven, which could not be solved conventionally, and also completely eliminates the electrical discharge between the container and the turntable during heating. It prevents this and has excellent effects.

[Brief explanation of the drawing]

1 to 26 show embodiments of the present invention, in which the odd-numbered drawings show a front cross section of the container, and the even-numbered drawings show a front view of the bottom of the container. FIG. 27 is a graph showing temperature changes due to heating of contents. 1... Container 2... Bottom 3... Microwave adjustment layer 4... Top opening Figure 27 Temperature ('C)

Claims (1)

[Claims] 1. The bottom of a cylindrical container having a circular bottom with a diameter of 60 mm or less, an ellipse with a major axis of 60 mm or less, or a polygonal bottom with a diagonal length of 60 mm or less and a height of 60 mm or more. A toppling prevention container for heating in a microwave oven, which is provided with a microwave adjustment layer for adjusting the amount of microwave radiation, the longest part of which is 55 mm or less. 2. The anti-tip container for heating in a microwave oven according to claim 1, wherein the microwave adjustment layer disposed on the bottom portion and adjusting the amount of microwaves is a metal film. 3. The microwave adjustment layer disposed on the bottom part for adjusting the amount of microwave is a metal film having an insulating layer on the outer surface.
The anti-tip container for heating in a microwave oven according to claim 1. 4. The microwave heating device according to claim 1, wherein the microwave adjusting layer disposed on the bottom portion and adjusting the amount of microwave is a layer formed of a composition containing metal powder mixed with synthetic resin. Anti-tip container. 5. The microwave heating device according to claim 1, wherein the microwave adjustment layer disposed on the bottom portion for adjusting the amount of microwaves is a metal film disposed inside the synthetic resin film forming the bottom portion. Anti-tip container. 6. Claim 1, wherein the microwave adjustment layer arranged on the bottom part and adjusting the amount of microwave is arranged on the entire bottom part.
The anti-tip container for heating in a microwave oven according to any one of items 5 to 5. 7. Microwave heating according to any one of claims 1 to 5, wherein a microwave adjustment layer for adjusting the amount of microwaves is partially disposed on the bottom surface. Anti-tip container for use. 8. The microwave oven according to claim 7, wherein the microwave adjustment layer for adjusting the amount of microwaves disposed on the bottom portion is arranged in a continuous or discontinuous ring shape on the peripheral edge of the bottom portion. Anti-tip container for heating. 9. The metal forming the microwave adjustment layer is aluminum,
The anti-tip container for heating in a microwave oven according to any one of claims 1 to 9, which is made of one or more metals selected from iron, silver, and nickel. 10.Claim 1, wherein the container is made of waterproof paper, plastics, or a ceramic product such as glass or ceramics.
The anti-tip container for heating in a microwave oven according to any one of items 1 to 10.