| 摘要 |
PROBLEM TO BE SOLVED: To obtain a plastic sheet with a foldable ruled line having foldability and folding strength without degrading spring back property of the plastic sheet folded along the foldable ruled line.SOLUTION: In the ruled line blade, a recessed blade portion extended in a direction which is inclined at a specific angle with respect to an attachment direction of the foldable ruled line is provided in an end top surface. A protruding portion is protruded from the surface of a bottom surface part having a curved cross-sectional shape. The foldable ruled line, where the protruding portion is installed to be extended in the direction which is inclined at the specific angle with respect to in a direction where the ruled line is installed, is attached to the plastic sheet. |
