| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrugated fiberboard sheet capable of being accurately folded along a vertical score line. SOLUTION: The corrugated fiberboard sheet 1 comprises the vertical score line 10 formed thereon by crushing the sheet 1 from a surface of an inside when the sheet 1 is folded. The score line 10 is formed of two wavy continuous lines 10a provided at a lateral symmetry. A mean strength of the sheet 1 at a score lined position of the sheet 1 is lowered as compared with other part, and the sheet 1 is folded along the line 10.
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