| 摘要 |
PROBLEM TO BE SOLVED: To completely seal the flange part of a vessel main body by a lid body, and solve a variation problem in separation strength between the lid body and the flange part of the vessel main body by forming an opening along the inside of an outer periphery of the lid body, and also forming the opening in an openable manner. SOLUTION: A lid body 1 to be sealed to the vessel main body opening 3 of a vessel main body 2 is formed with an opening inside thereof by opening cut lines A along its outer periphery. Also, the lid body 1 comprises a base material layer 5, barrier layer 6, and an adhesive layer 7; then, provided at the inside of the opening cut lines A made at the base material layer 5 are a tongue-like tap strip 8 containing a part of the open cut lines A and a depressed hole 9 at a part of the outer periphery of the tab strip 8, so that the tab strip 8 is picked readily by the depressed hole 9. The base material layer 5 and barrier layer 6 are adhered; however, the part of the tab strip 8 is adhered with the barrier layer 6 by applying a separation varnish at a position of the tab part in the rear surface of the base layer 5 in advance, thereby rendering the tab strip 8 separable.
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