A punching method in which an elongation margin is provided, and the width of the interval between two crease ruled lines is equal to the interval of the corrugated pitch of the double-sided corrugated cardboard sheet

摘要

[PROBLEMS] To fold a second vertical crease crease line and a fourth vertical crease crease line of a double-sided corrugated cardboard sheet box exactly 180 degrees regardless of the back-cutting or front-cutting punching method, so that the fishtail and the second seat Punching method for preventing box joint failure such as bending, and the like. In backside punching, second and fourth vertically folded ruled members are formed by first and second ruled members, respectively. A face plate 5 for forming the extension allowance 23 is provided at a position opposite to the middle of the ruled members 41, 42, and an interval size 43 as viewed from the center of the first and second ruled members is set to a stepped pitch 26. In the case of removing the front, the second and fourth vertically folded ruled members are made up of a left ruled member 441 and a right ruled member 442, and a push ruled member 443 for forming an extension allowance portion. Each of the crease member groups 44 is formed to face the crease member group. Position a face plate having a groove strip provided, and the width of the groove strip 55 the distance equal to the interval of corrugation pitch. [Selection] Figure 1