| 摘要 |
PURPOSE:To reduce a can opening force of an easy-open cover by marking a score to a sandwich type laminated metallic plate, specifying a thickness of a plate of the opposite side of the marking, and also providing a prescribed deformation depth to the opposite side plate at the marking position. CONSTITUTION:An easy-open cover is manufacture by marking a score 5 to a sandwich type laminated metallic plate which has been formed by sticking metallic plates A, B to both sides by placing a resin 3 between them. In this case, a plate thickness of an opposite side plate B of a score marking plate A is set to <=120mum, and to the plate B of a score marking corresponding position of the plate A, a plate thickness is distorted and a deformation depth 4 of >=5% is provided. In this way, a can opening force of the easy-open cover can be reduced.
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