SEAL HEAD, AND CONTAINER SEALED USING SAID SEAL HEAD

摘要

Provided is a portion container whose detaching seal portion can be easily detached by a stress applied from a radial inner side based on an inside pressure of a container body, but can be hardly detached by a stress applied from the outside during distribution. Provided also are a seal head for sealing such container and a container sealed with using such seal head. The seal head includes pressing end portions (31A), (31B) for pressing a lid member (9) against a flange (5) of an opening. At least a portion of the pressing end portions (31A), (31B) is formed as an uneven projecting portion (31A) having different curvature radii in its cross sectional contour between a radial inner portion (Q1) and a radial outer portion (Q2) of the opening.