| 摘要 |
PROBLEM TO BE SOLVED: To provide a ruled line forming apparatus for forming a ruled line on a paper material such corrugated board, which can manufacture a corrugated board material having no ruled line crack in a good yield by preventing the ruled line crack of the corrugated board material. SOLUTION: This ruled line forming apparatus A has a sheet-like body part 10 having substantially a slender sheet-like shape as the whole, and a ruling edge 12 having a corrugated shape. The ruled line formed by the ruling edge 12 has a corrugated shape. In a ruling ring, also, its ruling edge is formed in the corrugated shape. COPYRIGHT: (C)2004,JPO
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