| 摘要 |
PROBLEM TO BE SOLVED: To form a packaging lid with only corrugated board by making a specified number of cut lines extending in all directions at the center of a rectan gular corrugated board, and folding back flaps formed by the cut lines down ward and inward to form cushion parts. SOLUTION: A rectangular hole 4 is opened at the center of a rectangular shape corrugated board sheet 12. Then, there is provided four cut lines extending in four sides from a square part of the rectangular hole 14, and four strips formed by the cut lines are fold back downward inward respectively, thereby forming a wall thickness part 38, first folded flaps 40, and second folded flaps 42. Employing this structural lid body 10 needs not to require cushion material of form styrene because the first folded flap 40 and second folded strip 42 form a cushion part. In addition, since four first folded flaps 40 and second folded flaps 42 are folded back a sealing property can be accomplished with the sheet, thus preventing dust or the like from coming therein.
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