| 摘要 |
PROBLEM TO BE SOLVED: To provide a packing box which is excellent in load bearing and can suppress the occurrence of bulging or buckling.SOLUTION: A plurality of side plates 31 each have a top end 34 and a bottom end 35, which are both ends in a vertical direction, and both side ends 39. A plurality of inner flaps 14 and a plurality of outer flaps 16 constitute a top plate 10 and a bottom plate 20 extended from the side plates 31 via respective rule marks of a top rule mark 34' and a bottom rule mark 35'. The top rule mark 34' is constituted of a line which connects two end points T1 that are intersections between the top end 34 and both side ends 39 to a middle point T2 that is at least one point between the end points T1 to form the top end 34 of this side plate 31. The bottom rule mark 35' is constituted similarly to the top rule mark. The respective middle points T2 in the top ends 34 and the bottom ends 35 are arranged so as to be shifted to the center side in a vertical direction of the side plates 31 from a straight line S which connects between the two end points T1. Each side plate has a rule mark 41 which connects between the respective middle points T2 in the top ends 34 and the bottom ends 35. |
