| 摘要 |
PROBLEM TO BE SOLVED: To provide a locking method for a sheet material, by which a plurality of sheet materials can be layered easily and certainly and the layered sheet materials can be used directly for packaging. SOLUTION: According to the locking method, a plurality of the plastic sheet materials 1 are layered, and a formed sheet material layered body 10 is penetrated and locked with at least one locking strip 20. COPYRIGHT: (C)2004,JPO&NCIPI
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