| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight case having some extent of rigidity and not bulky by bending a plastic plate punched into a prescribed shape and creased in a prescribed position and by inserting and fixing a plurality of combination pieces in slits provided in corresponding positions respectively. SOLUTION: A single-layer or multilayer sheet formed by molding a synthetic resin composition, which is obtained by mixing various types of additives with one kind or more of synthetic resin selected from prescribed resins, by calendering or extruding is punched into a prescribed shape and at the same time a fold line is formed therein to provide a plastic plate 10. The thickness of the plastic plate 10 is 0.1-1.5 mm or preferably 0.3-1.0 mm. In assembling the plastic plate 10, the case bottom forming area 13 and both case side forming areas 15 are bent approximately 90 deg. in the same direction and the case side faces/bottom face combination piece 18A is inserted and fixed in a slit 18a formed in the vicinity of the both sides of the case bottom forming area 13.
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