Package body and container

Abstract

A package body having capabilities of externally discharging gas produced from the contents, uniformly heating the contents, and preventing an occurrence of a recess in a container after heating, and the package body with such capabilities is realized by a simple structure. In the package body (100), the contents (130) received in the container is sealed by adhering a resin film (120) to a first adhesion part (111) at the upper edge of the container (110). First projections (112) projecting into the container (110) and in contact with the lower surface of the resin film (120) are formed on a container wall. On the upper surfaces of the first projections (112) are provided through-holes (113) extending through the container wall, annular second adhesion parts (114) for weakly adhering portions surrounding the through-holes (113) to the lower surface of the resin film (120), and second projections (115) projecting to a level higher than the upper edges of the second adhesion parts (114). When the internal pressure of the container (110) is increased, the resin film (120) swells upward to peel off the second adhesion parts (114), causing gas in the container (110) to be discharged to the outside of the container (110) through the through-holes (113).

Description

technical field [0001] The present invention relates to a package capable of discharging gas generated from contents to the outside of the container, and a container used for the package. Background technique [0002] In order to prevent contamination of foreign matter or deterioration of quality, foods such as bento boxes and non-staple foods are often sold in packages sealed inside resin containers. It is common for such foods to be able to be heated and cooked by a microwave oven or the like in the state of the package. However, when the food is heated in a state in which the food is sealed inside the container, the container may expand outward due to water vapor generated from the food at this time and may rupture. In addition, since fermented foods such as kimchi generate carbon dioxide along with fermentation, the container may burst even if the container is not heated. In view of this actual situation, in recent years, containers capable of discharging water vapor o...

AI Technical Summary

Problems solved by technology

However, since the packaging container of Patent Document 2 needs to wrap the sealing tape around the container body and the lid body, it has the following disadvantages: not only the manufacturing cost is high, but also the sealing tape must be removed, and the unsealing operation becomes cumbersome accordingly.

That is, for the food put into the packaging container of Patent Document 3 and the package of Patent Document 4, the gas flow generated inside the container tends to stagnate in some parts, and when heating with a microwave oven, etc., a temperature difference tends to occur at different places.

This temperature difference may cause uneven heating of the contents, and may also cause the taste of the food that has been heated and cooked to deteriorate.

[0008] And, for the food put into the packaging container of Patent Document 3 and the package of Patent Document 4, after the gas inside the container is discharged from the above-mentioned through hole, the internal pressure of the container is likely to be in a state lower than the external pressure. May be sunken inwards

These disadvantages are not limited to the food in the packaging container of Patent Document 3 and the package of Patent Document 4, and have not been solved in other packages such as the automatic cooking package of Patent Document 1 and the packaging container of Patent Document 2.

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