| 摘要 |
PROBLEM TO BE SOLVED: To provide a lid which can be hermetically sealed by a single process of sealing, which prevents contents from spilling out even if a container falls down and which can be separated into an air-permeable layer and a barrier layer. SOLUTION: The lid comprising a composite film (13) including a barrier layer (12) laminated on a base film (11) and a sealant film (14) laminated on a surface of the barrier layer of the film (13) via a molten polyethylene (15) is put over an opening of a molded container (20) with a flange. The lid (10) and a flange portion (21) provided along a periphery of the molded container are heat-sealed with each other using a linear heat-sealing bar, and thereafter when peeling the lid (10) from the flange (21), the sealant film (14) of a sealed portion and the molten polyethylene (15) located above it are divided into two by a cut edge, so that the lid is separated into the base film (11) including the barrier layer (12) and the sealant film (14) including the molten polyethylene (15). |
