| abstract |
PROBLEM TO BE SOLVED: To provide a lid member which can sufficiently secure airtightness at the time of closing and has excellent strength. SOLUTION: A lid portion made of a pulp-based material and a base portion are integrally connected via a hinge portion, and are formed so that the lid can be opened and closed, and the lid portion is provided with a bulging portion and a base portion. Provides a mounting portion to the package, a surrounding wall rising from the mounting portion, and a flange portion formed between the surrounding wall and the outlet, and when the lid is closed, the lid portion is When the lid portion is in contact with the flange portion and the closed state is maintained, the bulging portion is arranged so as to cover the surrounding wall while the pressing force is applied to the flange portion by the lid portion. When the holding of the closed state is released, the pressing force of the flange portion by the lid portion is released, and the force for opening the lid portion is applied from the flange portion to the lid portion. did. [Selection diagram] Fig. 2 |