| 摘要 |
PROBLEM TO BE SOLVED: To reliably peel a lid from a container without a composite sheet broken from half cuts for forming a hot water draining hole when the lid is completely peeled off from the container by laminating a plastic film layer on the composite sheet. SOLUTION: A composite sheet 1 comprises a sealant 2, a gas barrier layer 3, a plastic film layer 15 and an extruded thermoplastic resin layer 4 which are laminated sequentially from an internal face of a container. The constitution can increase tear strength of the composite sheet 1 by laminating the plastic film layer 15, so that a lid A when peeled may not be broken from half cuts for forming a hot water draining hole. Particularly, by using a stretched film as the plastic film layer 15, tear strength can be further improved, whereby the layer 15 can be thinner and a cost may not be much increased. |
