| 摘要 |
At least one or more grooves are formed in a vacuum thermal insulation material, and the insulation material is bent at the grooves and not at surrounding fillet sections adjacent to the grooves. By this, stress in a laminated film occurring at groove end sections, which are boundaries between the grooves and the surrounding fillet sections, can be reduced. This enables the area of small cracks occurring in that portion of the laminated film which is in the groove end sections to be restricted to minimum. As a result, reduction in thermal insulation performance over time can be restricted even if the vacuum thermal insulation material is bent.
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