| 摘要 |
PROBLEM TO BE SOLVED: To provide perforation lines for a carton that can be easily torn out, hardly reduce a strength of the carton and have such a shape as one in which the residual torn-out portions can be torn out in a clean state. SOLUTION: Perforation lines for a carton of this invention have some features as follows. Major perforation lines and auxiliary perforation lines are arranged discontinuously along a seal opening direction; the major perforation lines are arranged discontinuously on their perforation lines with their spaces being applied as a clearance; a length of each of the major perforation lines is longer than that of the clearance; the auxiliary perforation lines are arranged discontinuously on the lines in parallel with the perforation lines; the clearance part is moved in parallel with the perforation lines and their both ends are extended. COPYRIGHT: (C)2004,JPO
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