| 摘要 |
PROBLEM TO BE SOLVED: To easily unseal the upper part of a packaging box which has seal opening lines formed with one-streak perforations on at least three wall boards of a box body from a deformed part by forming a clue for unsealing by deformation utilizing corner parts of the box body. SOLUTION: Seal opening lines 9 formed with the perforations are provided on the three wall boards or four wall boards which are the front and back wall boards 2 and 3 and one side of both side side wall boards 7 and 8 or both sides thereof in a box body 1. Perforations 9a of the seal opening lines 9 on the front and back wall boards 2 and 3 are continuously formed in the same slanting direction. At the corner parts of the box body on one side side wall board 7 are formed so that the perforations can be cut off by partial pressure deformation by fingers, thereby, the upper part of the box body can be separated and opened upward from the seal opening lines 9.
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