| 摘要 |
PROBLEM TO BE SOLVED: To provide a low cost lid material which can form a partial opening at the time of opening without using a lid material wherein the partial opening is formed in advance. SOLUTION: For this lid material, a laminated film comprising a biaxially drawn polyester film having linearly tearing property at least at one layer is used. In this case, an opening tab is provided in such a manner that the easily tearing direction of the polyester film may become the opening direction of the lid material. Then, an opening assisting means is provided in the vicinity of the opening tab for the partial opening lid material. |
