| 摘要 |
PROBLEM TO BE SOLVED: To maintain an easy-assemble corrugated cardboard in a folded state and flatly. SOLUTION: The corrugated cardboard is easily assembled from the folded state by providing each pair of side face boards 1 and end face boards 2 and adhering bottom side boards 5 which are extended from the lower edge of the side face boards 1 to bottom side boards 6 which are extended from the lower edge of the end face boards 2 with adhesive pieces 8 having oblique creases 7 as the base ends. In the cardboard, a lock piece 13 and a lock hole 14 which can be engaged with each other in the folded state are provided in the opposed part in the vicinity of the top face. The elasticity of the crease in the folded state is suppressed by engaging them.
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