Packaging container for microwave oven and process for manufacturing the same

摘要

Provided are a packaging container for a microwave oven that excels in the sealing performance between a container body and lid, and that at heating/cooking by a microwave oven, maintains the internal pressure of the container for a given period of time to thereby enhance the taste of contents through steaming effect, and that thereafter, can spontaneously open with certainty from a steam releasing seal part; and an efficient process for manufacturing the packaging container. In the packaging container for microwave oven having a lid heat-sealed to the periphery of a flange part of container body made of a synthetic resin so as to attain hermetic sealing, at least one steam releasing seal part with a weakened part is disposed inside the peripheral seal part of the flange part at a position separate from the peripheral seal part.