| 摘要 |
PROBLEM TO BE SOLVED: To provide a lid material which does not generate bubbles on an interface of a paper layer due to heat when heat-bonding the lid material to a container even in a structure having a non-air-permeable layer on an external surface of the paper layer. SOLUTION: The lid material comprises a laminate structure including, from the exterior, the non-air-permeable layer, the paper layer and a heat-bonding resin layer. Fine flaws reaching the paper layer through the non-air-permeable layer on the external surface are formed on at least a peripheral region of the lid material including a heat-bonded region when the lid material is heat- bonded to the container.
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