| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging box having a simple structure to spontaneously close a lid when the lid opened is tilted to a certain angle and to change the angle of the lid opened for purposes.SOLUTION: A cylindrical box body 1a is formed by bonding both side edges of a side wall S, a lid flap 7 is extended along the upper edge of any side wall constituting the box body 1a, through a first folding line e, a vertical folding line c extending from the lower end edge of the side wall to the end of the lid flap 3, is formed at the center parts of the side wall and a lid flap 3, a V-shaped second folding line k and third folding line l which extend from respective ends of the first folding line e toward the vertical folding line c, respectively, are formed on the side wall side and the lid flap side, a quadrilateral area A extending on the side wall side and lid flap side, is formed across the first folding line e, and the folding direction of the first and third folding lines k and l, including the vertical folding line c in the area A, is changed to change the form of the lid flap 7. |
