| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of defective forming such as defective adhesion, separation and diagonal adhesion of an end part of a square cylinder, and to improve the assembly accuracy by notching one side of first and third inner flaps in contact with first and third outer flaps so as to be inclined in the direction of the other side of the first and third inner flaps from the middle thereof. SOLUTION: In a process to assemble a packaging box 2, a first surface 11 is folded in a rising manner along a bent part 25, and a fourth surface 14 is folded along a bent part 27. A first inner flap 21 and a third inner flap 23 are folded at right angles along bent parts 35 and 36. In the folding, sides 21a and 23a of the first inner flap 21 and the third inner flap 23 are brought into contact with sides of the first outer flap 31 and the third outer flap 33, but since inclined parts 21d and 23d are formed on the sides 21a and 23a, the first inner flap 21 and the third inner flap 23 are not hooked by the first outer flap 31 and the third outer flap 33 in the middle of the folding.
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