| 摘要 |
PROBLEM TO BE SOLVED: To effectively reduce a pull-open force needed to open a can lid, such as a full-open end type can lid, which is broken by pulling the can lid in the reverse initial break direction. SOLUTION: When an opening is formed on the easy-openable can lid excellent in tear-openability, part of a break guide groove called score, which is formed on a steel plate, is pressed to form an initial break, and then the can lid is pulled in the reverse pressed direction to tear the score. The score is formed at least recessively on the inner surface of the can lid, has a depth of 0.01 mm or more, and the minimum plate thickness of a score machined part is within a range of 0.03-0.09 mm. COPYRIGHT: (C)2004,JPO&NCIPI
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