| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminate structure of a lid wherein the laminate structure of the lid 2 does not contain a metallic layer such as an aluminum foil layer, the lid is excellent in flatness during a manufacturing process and in shape retention for maintaining a curved unsealed shape during use, remarkable unevenness does not occur on a surface and a rear face, and there is no through hole passing through the surface and the rear face of the lid such as perforations. SOLUTION: The lid 2 of the packaging container comprises at least a paper layer 2a, a plastic base layer 2b and a heat-sealable plastic layer 2d which are laminated sequentially from a surface thereof. It also has an easy-to-curve strip region 24 extending in an orthogonal direction to an unsealing direction approximately in the middle thereof. The region 24 is formed with a plurality of half cut rules 23 which pass through the plastic base layer 2b. |
