| 摘要 |
PROBLEM TO BE SOLVED: To make an interlock type paper-made container strong when the same is closed by a flap and to increase the overall rigidity of the same. SOLUTION: The wall faces 2A-2D of a paper-made container 1 are provided with roughly square first, third flaps 6A, 6C and second, fourth flaps 6B, 6D, and the tip ends of the flaps 6A-6D are formed to be positioned flush. A pair of slits 9 or notches 12 extending toward a continuous wall face 2 is provided at least on the first flap 6A, and a catching piece 10 is formed between the slits or the notches to be buried and catch the inner face side of the facing third flap 6C or the adjoining second and fourth flaps 6B, 6D. After folding the flap 6D from the flap 6B, the flap 6A is folded and the catching piece 10 is pushed inward for closing. COPYRIGHT: (C)2004,JPO
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