JP3062518U - Microwave oven container - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To release water vapor emitted from contents during heating to the outside, and to maintain the release of water vapor to the outside during cooling after completion of heating to prevent condensation of water vapor. To provide a container for a microwave oven that can keep the quality of contents favorable. A container body (3) is provided on at least a part of a heat-sealed portion (6) of a sealing sheet (4) when the content is heated by a microwave oven.
A weakly welded portion that can be peeled off from the opening peripheral portion by the pressure of the expanded steam inside is formed, and the opening peripheral portion is located near the weakly fused portion of the opening peripheral portion. Forming a re-adhesion preventing portion 8 for preventing the weakly fused portion 7 peeled off from the re-adhesion to the opening peripheral portion 5.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a microwave oven container, and in particular, comprises a resin container body having an opening formed on an upper portion thereof, and a thin sealing sheet formed to have a size capable of blocking the opening. A microwave oven configured to hermetically seal the inside of the container body by heat-sealing the sealed sheet to the periphery of the opening of the container body in a state where the contents before heating by the microwave oven are stored in the body. For containers.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as a means for storing contents such as preserved foods that are thawed or warmed by heating a microwave oven, a microwave oven container in which contents are hermetically stored has been used.

[0003] The microwave oven container has a resin container main body having an opening formed on an upper portion thereof. Further, the microwave oven container has a thin resin-made sealing sheet formed in a size capable of blocking the opening.

[0004] When the contents are sealed and stored in the microwave oven container, the sealing sheet is sealed with the contents in the container body so as to cover the opening. After being placed on the opening, the sealing sheet on the periphery of the opening was thermally fused to the periphery of the opening.

[0005] The microwave oven container in which the contents are sealed as described above has been used in such a manner that the sealed sheet is opened after being heated in the microwave oven.

[0006]

[Problems to be solved by the invention]

 However, in the conventional microwave oven container, after the heating of the content is completed, the saturated vapor pressure in the container body decreases as the temperature in the container body decreases, and the content is reduced when the content is heated by the microwave oven. Water vapor evaporating from the material and expanding the sealing sheet was condensed and formed a large amount of water droplets and adhered to the inner surface of the sealing sheet. Therefore, when the sealing sheet was opened after the heating of the content was completed, water droplets attached to the inner surface of the sealing sheet had spilled onto the content.

Further, the pressure of the water vapor in the container main body is reduced with the temperature drop in the container main body after the completion of the heating of the contents, so that the sealing sheet is inwardly attached with water droplets on the inner surface. In some cases, it was dented and came into contact with the contents.

[0008] Therefore, there has been a problem that the heated contents are wetted by water and the taste and quality of the contents are deteriorated. Also, once the sealing sheet was opened, it re-adhered when the pressure of the released steam dropped, and the internal pressure at that time was low, so it was necessary to prevent the container and its contents from being crushed.

The present invention has been made in view of the above-mentioned point, and discharges water vapor emitted from contents at the time of heating to the outside, and at the time of cooling after heating is completed, retains water vapor to the outside at the time of cooling. It is an object of the present invention to provide a container for a microwave oven that can maintain the quality of the contents well by preventing the dew condensation from occurring.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, a feature of the microwave oven container according to claim 1 of the present invention is that at least a part of the heat-sealing portion of the sealing sheet has expanded steam inside the container body when the content is heated by the microwave oven. A weakly fused portion that can be peeled off from the peripheral edge of the opening by the pressure of The point is that a re-adhesion prevention part for preventing re-adhesion to the peripheral portion is formed.

[0011] By adopting such a configuration, when the content is heated by the microwave oven, the water vapor inside the container main body can be released to the outside, and also at the time of cooling after the completion of the heating. The release of water vapor to the outside can be maintained, and the condensation of water vapor can be suppressed.

A feature of the microwave oven container according to a second aspect is that, in the first aspect, the weakly-fused portion is configured such that the sealing sheet is thermally fused to the peripheral portion of the opening in a mesh-like manner. In this case, at least one method is selected from the fact that the width is narrowed by heat-sealing and hot melt is used.

[0013] By employing such a configuration, the weakly fused portion can be formed with a simple configuration.

[0014]

[Embodiment of the invention]

 Hereinafter, an embodiment of a container for a microwave oven according to the present invention will be described with reference to FIGS.

FIG. 1 shows a microwave oven container in a state in which contents are hermetically stored in the present embodiment.

The microwave oven container 1 has a substantially rectangular resin-made container main body 3 having an opening 2 formed in an upper portion thereof. Further, the microwave oven container 1 has a thin transparent sealing sheet 4 made of resin and formed in a size capable of blocking the opening 2.

The sealing sheet 4 does not have to be transparent.

A portion of the sealing sheet 4 corresponding to the opening peripheral portion 5 of the container main body 3 is a heat-sealed portion 6 in which the sealing sheet 4 is heat-sealed to the opening peripheral portion 5.

Further, the portions of the heat-sealed portion 6 corresponding to the four corners of the opening peripheral portion 5 have a lower welding force to the opening peripheral portion 5 than the surrounding heat-sealed portion 6. It is a weakly welded part. The weakly fused portion 7 is formed by heat-sealing the sealing sheet 4 to the opening peripheral portion 5 in a mesh form. Further, the formation range of the weakly fused portion 7 is a half of the outer peripheral portion 5 on the outer periphery 5B side.

That is, since the weakly-fused portion 7 is formed in a mesh shape, it has a portion that is thermally fused to the opening peripheral portion 5 and a portion that is not thermally fused. The fusion force to the opening peripheral portion 5 is weaker than that of the surrounding heat fusion portion 6. The fusing force of the weakly fusing portion 7 is such that when the content of the weakly fusing portion 7 is heated by a microwave oven, the weak fusing portion 7 is separated from the peripheral edge portion 5 of the opening by the pressure of steam generated inside the container body 3. It is a fusion force that can be used. The fusion force of the weakly fused portion 7 is proportional to the area of the portion of the sealing sheet 4 that is thermally fused to the opening peripheral portion 5, and this area corresponds to the fineness of the mesh. For this reason, when changing the fusion force of the weak fusion portion 7 according to the type of the content, the fineness of the mesh may be changed.

At the opening peripheral portion 5 of the container body 3 and near the opening 2 side of the weakly fused portion 7, a weakly fused portion 7 peeled off from the opening peripheral portion 5 when the content is heated. A re-adhesion prevention portion 8 is formed to prevent the contents from being re-adhered to the opening peripheral portion 5 during cooling after the heating of the contents is completed. The reattachment preventing portion 8 is formed by projecting a plurality of protrusions 9 upward at an interval from each other along the inner periphery 5A of the opening peripheral portion 5. The anti-redeposition part 8 may be formed integrally with the container body 3 when the resin of the container body 3 is molded.

Next, the operation of the present embodiment will be described.

First, in the initial state, as shown in FIG. 2, the weakly fused portion 7 is fused to the opening peripheral portion 5 so that the inside of the container body 3 is sealed.

Then, the microwave oven container 1 in which the contents are sealed is placed in an electronic range (not shown) and heated.

By the heating by the microwave oven, the water vapor is evaporated from the contents in the microwave oven container 1. Then, as the temperature inside the container body 3 increases, the water vapor expands, and the pressure inside the container body 3 increases. Then, when the pressure inside the container body 3 reaches a certain value, the weakly welded portion 7 cannot separate the pressure inside the container body 3 and peels off from the peripheral edge portion 5 as shown in FIG.

When the weakly welded portion 7 peels off from the peripheral edge portion 5 of the opening, the water vapor inside the container body 3 is released to the outside as shown by the arrow in FIG. The weakly fused portion 7 peeled off from the opening edge 5 is slightly moved upward by the pressure of the water vapor released to the outside.

Next, when water vapor is released to some extent by the heating by the microwave oven, the weakly welded portion 7 that has been peeled off from the opening peripheral portion 5 returns to the place where it originally adhered. At this time, since the inner surface of the weakly-fused portion 7 is wet with water vapor, the weakly-fused portion 7 comes into close contact with the opening peripheral portion 5, and the container main body 3 and the contents are separated due to a difference in pressure between the inside and outside. Collapse occurs. Even in the range, the pressure inside the container body 3 is reduced as the temperature drops. As a result, the weakly-fused portion 7 moves downward and tries to re-attach to the opening peripheral portion 5, but as shown in FIG. Since the abutting portion contacts the sealing sheet 4 from below, the downward movement of the weakly fused portion 7 is suppressed. Therefore, according to the present embodiment, since the weakly-fused portion 7 can be prevented from re-adhering to the peripheral edge portion 5 of the opening, the water vapor inside the container main body 3 is cooled when the content is cooled after the completion of heating. It does not prevent release to

That is, since the inside of the container body 3 is not always in a hermetically sealed state even after the heating of the contents is completed as in the conventional case, the pressure of the steam in the container body 3 becomes saturated with the temperature drop. Before the pressure reaches the pressure, the water vapor can be released to the outside, and accordingly, the water vapor in the container body 3 is condensed and adheres to the inner surface of the sealing sheet 4 as a large amount of water droplets. Can be prevented.

Furthermore, even if the inside of the container body 3 is depressurized due to the temperature drop after the heating of the contents is completed, external air flows into the container body 3 from the peeled portion of the weakly fused portion 7. As a result, the pressure inside the container body 3 is regulated, so that the sealed sheet 4 does not inwardly come into contact with the contents due to the pressure reduction inside the container body 3 as in the related art. Therefore, even if a small amount of water vapor in the container body 3 is condensed and adheres to the inside of the sealing sheet 4 as water droplets, the water droplets may contact the contents of the sealing sheet 4 at the time of cooling. Adherence can be prevented.

After the water vapor inside the container body 3 is released to the outside, the sealing sheet 4 is opened. At this time, since water droplets hardly adhere to the inner surface of the sealing sheet 4, the water droplets do not spill on the heated contents, and the taste and quality of the contents are not impaired.

Therefore, according to the present embodiment, the water vapor in the container body 3 can be released to the outside when the content is heated by the microwave oven, and the water vapor can be discharged to the outside even when the content is cooled after the heating of the content is completed. Can be maintained and the water vapor in the container body 3 can be prevented from dew condensation, so that the taste and quality of the heated contents can be kept good.

The present invention is not limited to the above-described embodiment, and can be variously modified as needed.

For example, in the present embodiment, a total of four weakly fused portions 7 are formed at positions corresponding to the four corners of the opening peripheral portion 5. However, the present invention is not limited to this. The number and the formation position of these may be variously changed as necessary.

Further, in the present embodiment, the weakly-fused portion 7 is formed by heat-sealing the sealing sheet 4 to the opening peripheral portion 5 in a mesh shape. However, the present invention is not limited to this. The weakly-fused portion 7 may be formed by heat-sealing the sealing sheet 4 into a number of small-diameter dots.

Further, in the present embodiment, the anti-redeposition part 8 is formed on the side of the opening 2 of the weakly fused part 7, but the present invention is not limited to this. By replacing the formation position, the anti-redeposition part 8 may be formed on the outer periphery 5 </ b> B side of the opening peripheral part 5.

[0036]

[Effect of the invention]

 As described above, according to the microwave oven container according to the first aspect of the present invention, the water vapor in the container body can be released to the outside when the contents are heated by the electronic range, and the steam is temporarily stopped to prevent the container from exploding. There is no need to take out and open a part of the sealing sheet to release the expanded water vapor to the outside. In a vending machine as well, it is possible to apply heat while maintaining a completely sealed and clean state, and to maintain the release of water vapor to the outside even during cooling after completion of heating of the contents. Since the dew condensation of water vapor in the container body can be prevented, the taste and quality of the contents after heating can be kept good.

According to the microwave oven container of the second aspect, the weakly welded portion can be formed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a microwave oven container in which contents are sealed and stored in an embodiment of the microwave oven container according to the present invention.

FIG. 2 is a side view showing a configuration around a weakly fused portion before heating the contents in the embodiment of the microwave oven container according to the present invention;

FIG. 3 is a side view showing a configuration around the weakly fused portion when the content is heated in the embodiment of the microwave oven container according to the present invention;

FIG. 4 is a side view showing the configuration around the weakly fused portion after the heating of the contents is completed in the embodiment of the microwave oven container according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microwave oven container 2 Opening 3 Container main body 4 Sealing sheet 5 Opening periphery 5A Inner periphery 5B Outer periphery 6 Heat fusion part 7 Weak fusion part 8 Reattachment prevention part 9 Projection

Claims (2)

[Utility model registration claims] 1. A resin container body having an opening formed in an upper part thereof, and a resin sealing sheet formed to have a size capable of blocking the opening, wherein the container body is not heated by a microwave oven. In a microwave oven container formed so as to hermetically seal the inside of the container body by heat-sealing the sealing sheet to an opening peripheral portion of the container body in a state where the contents of the sealing sheet are stored, At least a part of the heat-sealed portion is formed with a weakly-sealed portion that can be peeled off from the peripheral portion of the opening by the pressure of the expanded steam inside the container main body when the content is heated by the microwave oven, A re-adhesion preventing portion for preventing the weakly-fused portion peeled from the opening peripheral portion from re-adhering to the opening peripheral portion at a position near the weakly-fused portion of the portion. Electron len Use container. 2. The weakly-fused portion is formed by hot-melting the sealing sheet to the periphery of the opening in a mesh shape, narrowing the width of the heat-sealed portion, and heat-sealing the sealing sheet. 2. The microwave oven container according to claim 1, wherein at least one method is selected from the following.