| 摘要 |
PROBLEM TO BE SOLVED: To obtain a molding having no gloss irregularity and no unevenness on the surface and excellent external appearance of the surface. SOLUTION: This method for press molding a thermoplastic resin has the step of compression fluidizing the resin of a molten state in a mold to shape it to a predetermined shape, and comprises the steps of so controlling the compression velocity as to satisfy the formula A/2<=B<=2A, where A(mm/s<2> ) is the acceleration at the time of 70% of the maximum speed in the acceleration range of the compression from the start of compression of the resin to the arrival of the compression velocity to the maximum velocity, and B(mm/s<2> ) is the deceleration at the time of 75% of the maximum speed in the deceleration range of the compression until the compression shaping is completed after the arrival at the maximum velocity, and press molding it. |
