| 摘要 |
PROBLEM TO BE SOLVED: To provide a packing material made of corrugated paper having a similar sufficient strength against impact from different directions. SOLUTION: In the packing material made of the corrugated paper in which at least one main flat part formed in a corrugated board is formed by folding back, a reinforcing part to reinforce the main flat part is formed by folding at least a part of the main flat part at a folding line crossed at 45 degree in the wave shape direction in the center core part of the corrugated board and piling up on the main flat part. The reinforcing part may have a structure having at least two layers piled up at least at one folding line. COPYRIGHT: (C)2010,JPO&INPIT
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