| 摘要 |
PROBLEM TO BE SOLVED: To facilitate creasing, and setting-up, prevent cracks in the end part of a crease from being generated and prevent also the container from becoming bulged by providing the crease by leaving a specified area from the end part of a sheet on the extension of the crease. SOLUTION: When a planar plastic sheet 1 is fabricated by folding to the shape of a container, a crease 2 for folding is linearly set as a cut (fold) in the plastic sheet 1, in order to make an optional folding part of the plastic sheet 1 easily foldable at a desired angle. The crease 2 for folding is set excluding the area of a 0.5-5.0 mm (W1 and W2) from the end part of the sheet 1 in the extension of the crease 2. The plastic sheet 1 can be easily obtained by forming a resin composition consisting of polyvinyl chloride, polypropylene, polyethylene terephthalate, polystyrene or the like into a hard or a semihard sheet, and punching the sheet to a specified shape. The thickness of the sheet is preferably about 0.1-1.0 mm.
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