| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the flatness of a molded synthetic resin flat plate to not higher than 0.5. <P>SOLUTION: A thin and flat product 1 having an area of 1,000 mm<SP>2</SP>or more is injection molded with an injection mold 70. The flat product 1 molded with the injection mold 70 is taken therefrom, and is positioned to fill the distortion straightening mold 40 consisting of a movable distortion straightening mold 10 and a fixed distortion straightening mold 20, using the outer periphery or the corner holes 2a, 2b, 2c, 2d of the flat product 1. A load in the direction reverse to the mold distortion direction is applied to a partial area or the whole area of the flat product, corresponding to the molding distortion of the flat product 1 molded with the injection mold 70. The flat product 1 molded with the injection mold 70 is pressurized and straightened with the distortion straightening mold 40 at a product temperature lower than the molding temperature, cooled at the cooling speed and taken out of the mold at a take-out temperature of a distortion straightened product, thereby executing the straightening of the distortion of the flat plate. <P>COPYRIGHT: (C)2008,JPO&INPIT |
