| 摘要 |
A structure (PET bottle, for example) (A) with folding lines, having a plurality of polygonal parts (P) and linear part-connectors for mutually connecting the outer sides of respective parts (P), with foldable linear folding lines (M, V) provided along the linear part-connectors, wherein the folding lines (M, V) consist of a plurality of ridged folding lines (M) ridge-folded at one surface side of the structure when viewed from the one surface side and more than one furrowed folding lines (V), with respective folding lines satisfying folding requirements. A novel folding method, wherein a wall-shaped structure is divided into polygonal planar parts (P) by many folding lines, and folding lines (M, V) at boundary portions between respective planar parts are mad foldable; and a novel folding line forming mold and a folding line forming method.
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