| 摘要 |
PROBLEM TO BE SOLVED: To provide a blanking die for forming a half cut line without causing crush of sheet material. SOLUTION: The blanking die includes a full cut blade 9 with high blade height for making a full cut line penetrating through the surface to the back side of a sheet material S and a half cut blade 11 with low blade height for cutting the sheet material S to the halfway in the thickness direction. A plurality of projection parts 11a are juxtaposedly formed on the half cut blade 11 in the longitudinal direction of the blade, and gradient is formed on the top edge of each projection part 11a, and a recessed part 11b is provided between the adjacent projection parts 11a. As the sheet material is cut from a higher part of the top edge of the projection part 11a in order, the sheet material such as the corrugated fiber paper or the like is not strongly pressed to be crushed, and a joint part is formed in the half cut line by the recessed parts 11b, thus preventing a trouble such as bending at a position except the predetermined position or a trunk expansion on piling when making a box of from the sheet material. COPYRIGHT: (C)2010,JPO&INPIT
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