JPH0722546B2 - Container for high frequency heating cooker - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a container for a high-frequency heating cooker, in which a container filled with cooked food is housed in a high-frequency heating cooker, a so-called microwave oven, and heated. To a container suitable for.

[Conventional technology]

With the recent widespread use of microwave ovens, individual food packaged foods in which cooked foods such as curry and stew are filled in a container and heated and cooked in the microwave oven in the container as it is are on the market. When heating such cooked food, it is how to uniformly heat the food in the container. In the case of a cup-shaped container having a relatively high shape as the shape of the container in this case, the lower part of the container tends to be heated quickly, and particularly in the case of viscous food, convection heating is difficult, The lower part of the inner part is partially overheated, which causes deformation and overturning of the container due to the internal pressure. Therefore, various developments have been made to try to solve such problems.

For example, in JP-A-57-12227, there is a problem that microwaves of a microwave oven are concentrated on the peripheral wall, so that the food temperature near the peripheral wall becomes higher than the food temperature at the center of the container, causing uneven heating. As a means for interpreting this problem, a microwave blocking layer is formed on the peripheral wall of the container.

Further, Japanese Patent Application Laid-Open No. 61-135615 proposes that the peripheral wall and the opening of the container except the bottom wall are covered with a microwave blocking layer to thereby uniformly heat the food as a content and prevent spillage. ing.

[Problems to be solved by the invention]

However, in the container described in JP-A-57-12227, since the container is formed in a tray shape, uniform heating is certainly possible, but it is applied to a cup-shaped container. In this case, since the amount of reflected microwaves is large and the heating efficiency is extremely low, there is a problem that a cup-shaped container cannot be applied to a container having only a microwave blocking layer formed on its peripheral wall.

Further, in the container described in Japanese Patent Application Laid-Open No. 61-135615, most of the outer periphery of the container is covered with the microwave blocking layer, which rather causes a problem of lowering heating efficiency and causes a problem. To obtain the heating temperature, the microwave oven must be operated for a long time. This is a drawback that the power consumption of the microwave oven is large in addition to the drawback that heating and cooking cannot be expected in a short time.

An object of the present invention is to prevent the partial overheating of the container as well as the substantial reduction of the heating efficiency in heating the cooked food, and to prevent the container from deforming or falling due to internal pressure or the like. It is to provide a container for a high-frequency cooker that can be used.

[Means for solving problems]

The container for high-frequency heating cooker according to the present invention is a cup-shaped container having a deep bottom, and has a structure in which a microwave blocking layer is provided on a part of the height of the side wall or less and a part of the bottom wall, It is intended to suppress the overheating of the lower part of the container by the microwave blocking layer and prevent the deformation of the contents of the container due to the internal pressure without securing the microwave transmitting portion and lowering the heating effect.

[Action]

When the contents are heated, the container is placed in a microwave oven, and the contents are heated by being irradiated with microwaves for a predetermined time. At this time, the height of the side wall of the container body
A microwave blocking layer provided on a portion of 1/3 or less and a part of the bottom wall blocks transmission of microwaves, prevents overheating of the portion, and eliminates the cause of deformation of the container. Further, the microwave blocking layer is provided at a partial portion of the container, and the contents are heated without lowering the heating efficiency.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the figure, the container 10 is made of a thermoplastic resin which is a microwave transmitting material, paper or a composite material thereof, and the thermoplastic resin sheets are thermoformed or injection-molded to form a cup-shaped cup having a substantially cylindrical shape as a whole. Is formed. In this case, the thermoplastic resin may be one filled with an inorganic filler. At this time, the container 10 may be a multi-layer resin container, and particularly preferably has a gas barrier resin layer.

The container 10 has a bottom wall 11 including a contact surface 11A for a turntable of a microwave oven (not shown), and a raised flat surface 11C connected to the contact surface 11A via an inclined surface 11B facing the inside of the container 10. I have it. A tapered peripheral wall 12 that gradually expands upward from the outer peripheral edge of the bottom wall 11 is provided upright to form an opening 17, and the upper end edge of the peripheral wall 12 extends outward in the horizontal direction. A flange portion 13 is formed. At this time, the relationship between the height H of the peripheral wall 12 and the diameter D of the opening 17 is H / D = 0.7 or more.

A microwave blocking layer 15 having a height h selected from the range of 1/3 or less, preferably 1/4 or less of the height H of the container 10 is circumferentially formed on the lower outer peripheral surface of the peripheral wall 12. Has been done. The microwave blocking layer 15 is formed by bonding a thin film of a high frequency opaque metal such as aluminum, silver or nickel. When forming the microwave blocking layer, other means such as vapor deposition or printing may be adopted instead of bonding to form the microwave blocking layer.

Further, on the lower surface side of the raised plane 11C in the bottom wall 11,
A microwave blocking layer 15 similar to the microwave blocking layer 15 provided under the peripheral wall 12 is formed. The bottom wall
No microwave blocking layer is provided on the contact surface 11A and the inclined surface 11B of 11.

Curry, stew, etc., such as cooked food 16 having a particularly high viscosity, is filled in the container 10, and a seal member (not shown) made of a synthetic resin film or the like is attached to the opening 17 in a watertight manner on the upper surface of the flange 13. Is being blocked,
If necessary, the outer lid is fitted and mounted.

In the above configuration, when the cooked food 16 is heated in the microwave oven, the outer lid and the seal member are provided at the opening 17 of the container 10.
The container 10 is further removed, and the container 10 is housed in the microwave oven with the outer lid fitted and mounted as necessary. Next, the cooked food 16 is heated by receiving microwave irradiation for a predetermined time.

At this time, microwaves are not transmitted to the lower peripheral wall 12 and the raised flat surface 11C of the bottom wall 11 on which the microwave blocking layer 15 is formed. Therefore, heating of the part is not preceded.

According to such an embodiment, the following effects can be obtained.

That is, in the cup-shaped container, since the microwave blocking layer 15 is provided around the bottom of the container, which is a part where the deformation of the container due to the internal pressure caused by partial overheating is likely to occur, it is possible to suppress overheating of the part as much as possible. It is possible to prevent deformation of the container due to internal pressure that appears when heating viscous food such as curry or stew, and there is no risk of the container 10 falling over due to deformation. This means that a thermoplastic resin thermoformed container having a thin bottom portion can be applied without any difficulty.

Moreover, the microwave blocking layer 15 provided under the peripheral wall 12
Since the height is set to 1/3 or less of the height H of the container 10, microwaves can pass through the peripheral wall 12 portion where the microwave blocking layer 15 is not provided. Therefore, the microwave blocking layer 15
Even if the heating element is provided, the heating efficiency is not significantly lowered, and it can be expected that the heating is performed with a heating time and power consumption that are almost the same as those in the past.

Further, since the corners in the container are not excessively irradiated with microwaves, it is possible to prevent uneven heating, and the cooked food 16 may boil over and boil off even after heating for a long time. Nor.

In the above description, the cooked food 16 is particularly viscous, but the container according to the present invention can of course be applied to non-viscous food. However, if it is a container for viscous foods, a more excellent effect can be exhibited.

Further, the container 10 is not limited to a cylindrical cup, and may be a cup having another shape such as a square pole, and can be arbitrarily changed according to the type of cooked food to be filled, the consumer group, and the like. .

Experimental examples of the present invention are shown below.

1. Container: H = 70mm D = 70mm Bottom wall diameter = 55mm Thermoformed Idemitsu Multi-Lay Sheet (Polyophine / Ethylene-Vinyl Alcohol Copolymer Multilayer Sheet) 0.8mm 2. Contents: Stew with ingredients 3. Microwave oven Heating time: 4 minutes; Power: 500W 4. Microwave blocking layer: Aluminum foil sticking (sticking only the lower part of the surrounding wall) x: Height of aluminum foil coating from the bottom of the container n: Number of samples t: Time to boiling (seconds) (immobility): No movement (fine): Little movement can be confirmed by sound (middle): Movement but collapse Not so (super): violent movement that seems to collapse (overturn): fall * The evaluation points are those that do not move at all = 0, (fine) = 1,
A value obtained by dividing (summary) = 2, (heavy) = 3, (rolling) = 4, and multiplying the number by the number of samplings n is shown. Therefore, it can be said that the higher the evaluation point, the more likely it is to collapse.

As can be understood from the above table, it is clear that when the microwave blocking layer is provided in an appropriate range, the container has high stability and is less likely to be deformed.

〔The invention's effect〕

As described above, according to the present invention, when heating cooked food, there is no substantial decrease in heating efficiency, partial overheating of the container is prevented, and deformation of the container due to internal pressure, etc. There is an effect that it is possible to provide a container for a high-frequency cooker capable of preventing a fall or a fall.

[Brief description of drawings]

The drawing is a front view in which a part of a container showing one embodiment of the present invention is longitudinally cut. 10 …… container, 11 …… bottom wall, 12 …… peripheral wall, 15 …… microwave blocking layer, 16 …… cooked food.

Claims (1)

[Claims] 1. A deep-cup-shaped high-frequency cooking inner container having a deep bottom, characterized in that a microwave blocking layer is provided on a portion of the side wall at a height of 1/3 or less and a portion of the bottom wall. High frequency cooking container.