In the material for the cardboard box in order to raise bending size precision the ruled line process manner

摘要

PROBLEM TO BE SOLVED: To fold easily at a prescribed position with flexural stress concentrated at a ruled line part without the dislocation of a folding position irrespective of a position to which a ruled line comes. SOLUTION: In a raw material for a box which is composed of a corrugated board in which a liner is glued onto one side or both sides of a core, when a crease ruled line is cut on a corrugated board in the corrugation direction, two parallel crease ruled lines (ab), (a'b') are cut so that the distance between the lines is narrower than the corrugation pitch, and an arc-shaped notches is formed at both ends of the crease ruled lines.