| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a packaging box facilitating a box dividing operation for forming a tray and having increased strength of a structure itself for constituting the remaining lower tray. <P>SOLUTION: Unsealing start parts (100) are formed at the substantially central parts of side surface boards (11, 15). The unsealing start part includes a pair of tearing start pieces (110) formed by cutting lines with a constant space therebetween. Facing lower ends of the pair of tearing start pieces are joined to each other by a cutting line (120) of a convex shape directed upward from the lower ends. Facing upper ends of the pair of tearing start pieces are joined to each other by an upper folding line (150) connecting the upper ends of both. A V-shape folding line (180) formed in a V-shape is formed from a top part of the cutting line of the convex shape toward the upper folding line. By pressing an area in the V-shape so that the V-shape folding lines are valley folded relative to each other, the facing cutting lines of the pair of tearing start pieces are cut, and the cutting line of the convex shape is cut so that an opening is formed. <P>COPYRIGHT: (C)2013,JPO&INPIT |
