THERMAL SEALING LID MEMBER HAVING EASILY-UNSEALABLE CHARACTERISTIC

摘要

PROBLEM TO BE SOLVED: To provide a thermal sealing lid member having an easy seal opening characteristic capable of saving resource while having a sufficient strength for protecting its stored content and capable of performing an easily unsealing operation. SOLUTION: There is provided a lid member 1 comprised of a base material 11 and an adhering agent layer 5. The adhering agent layer 5 is partially formed on the base material 1. In this lid member 1 for a thermal sealing, a coating surface of the adhesive agent layer is formed to have a shape expanding in sequence from a seal opening start segment along a seal opening direction or formed in such a way that a density of the adhesive agent layer coating is increased in sequence from an outer edge segment toward an inner edge segment.