| 摘要 |
PROBLEM TO BE SOLVED: To prevent a lid from being broken when a container which is stored under a frozen state is unsealed by a method wherein on a heat-resistant external, a straight chain low density polyethylene layer of which the thickness has a specified value, is provided, and on the external surface of the polyethylene layer, a heat-bonding layer is provided. SOLUTION: On an external layer material 2, a heat-bonding layer 4 is provided with a straight chain low density polyethylene resin layer 3 of which the thickness is 20-100μm, and a lid 1 is formed. Also, the heat-resistant external layer material 2, the straight chain low density polyethylene resin layer 3 with a thickness of 20-100μm, and the heat-bonding layer 4 are laminated in order, and the lid 1 is formed. In this case, the heat-resistant temperature of the external layer material 2 is made 120 deg.C or higher, and the softening point of the heat-bonding layer 4 is made 80 deg.C or lower. Also, the opening of a container main body is heat-sealed with the lid 1, and a container for freeze-preservation is formed. The container using this lid can be easily unsealed without being broken even after a freeze-preservation. For this reason, a broken piece is not mixed into a content (mainly a food or a drug, etc.), and also, the broken piece does not remain in the container main body, and the content can be smoothly taken out.
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