| 摘要 |
PROBLEM TO BE SOLVED: To prevent a product to be stored from being damaged by bringing a tip of a flap into contact with the inner side of a folded part of the other flap opposite to thereto, and setting a riser part from the folded part of the flap which is narrowed from the folded part to an engagement part to be same in width to increase the resistant strength against the ridge drop or the angle drop. SOLUTION: Flaps 1-4 on a bottom surface 5 side are provided with engagement parts 1a-4a, the length from a folded part of the flaps 1 and 3 to a tip is approximately as large as the short side of a box body, and the tips of the flaps 1 and 3 are brought into contact with the inner side of the folded part. Riser parts 1b-4b of the flaps are of same width, and then, gradually narrowed. Since the tips of the flaps 1 and 3 are brought into contact with the inside of the folded part of the counterparts, the ridge, strength of the long side is improved. Since the strength of the riser parts of the flaps is increased, the strength of the angle part is improved, and a product to be stored is less affected.
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