| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a packing box having enough strength without reinforcing with a separate piece by changing a shape of a top panel flap. SOLUTION: A top panel flap 2 of an edge having no hand hole 3 is extended laterally to a side face 6. An auxiliary hole 4 which overlaps the hand hole 3 at assembling is provided at a reinforcing structural part 5. A folding line 7 foldable to the side of the hand hole 3 of a packing box 1 at assembling is provided. At first, the reinforcing structural part 5 is folded by the folding line 7 of the top panel flap 2. After the top panel flap 2 is folded, a remaining top panel flap 8 is folded. The packing box 1 having the hand hole 3 overlaps the reinforcing structural part 5 having the auxiliary hole 4 so as to be in a doubled state, so that a doubled strength of the hand hole 3 can be ensured.</p> |
