| 摘要 |
PURPOSE: To make raising easy while improving transparency and the strength in rigidity by a method wherein stretching is applied in one direction to a plastic sheet and creasings in the form of half-cut scoring are formed in the direction intersecting the direction of stretching. CONSTITUTION: Uniaxial stretching is applied in the direction A to a sheet 2 made of a polypropylene resin, and half-cut scorings 3 are provided at the sheet in the direction intersecting the uniaxial stretching so that the scorings cut the sheet 2 in the depth in 20-60% of the thickness of the sheet. The half-cut scorings 3 are provided so that creasings for bending the sheet can be formed on the side that becomes the outside of a case. Panels 2a-2d are formed of the half-cut scorings 3 serving as the creasing, and a case is formed with the panel 2d put on and stuck to an adhesion piece 20 with an adhesive. Thereby, the panels can be raised easily while improving transparency and the strength in rigidity. |
