| 摘要 |
PROBLEM TO BE SOLVED: To prevent a paper tray from being deformed even when stretch film packing is applied to it by setting the outward resilience in the center region stronger than the resilience in both the right and left regions of the center region for at least a pair of side plates. SOLUTION: All side plates 6-9 are folded inward along inward folding lines limiting the peripheral edges 2-5 of a bottom plate 1 and inner folding lines 12-15. The central portions of the inward folding lines and the central portions 12A-15A of the inner folding lines 12-15 are pulled to both the right and left side areas, and internal stresses to form straight folded lines are applied. The internal stresses generate the force to repulse the outer folding lines 6C-9C portions of inside plate pieces 6A-9A, and strong outward resilience is applied to the outer folding lines 7C, 9C portions of side plates 7, 9 because the intervals between the central portions 13A, 15A of the inner folding lines 13, 15 of the side plates 7, 9 and outer folding lines 7C, 9C are narrower than the intervals between the central portions 12A, 14A of the inner folding lines 12, 14 of other side plates 6, 8 and outer folding lines 6C, 8C.
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