| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for molding a synthetic resin molded article wherein there exists no possibility of forming defects such as a welded line in the neighborhood of a through-hole. SOLUTION: In this method for molding, a through-hole is formed at a specified site of a synthetic resin molded article obtd. by press molding of a molten synthetic resin injected between a top mold and a bottom mold. At first, a molten synthetic resin M is injected into a molding gap 15 at a specified position of the top mold 12 and between the top mold 12 and the bottom mold 11 (a molten synthetic resin injection process). Then, the top mold 12 is lowered from a specified position to press the molten synthetic resin M and holds a specified molding gap and reaches the bottom dead spot position (a mold clamping process). Thereafter, just before the top mold 12 reaches the bottom dead spot position or after it reaches the bottom dead spot position, a pin 22 provided to the top mold 12 is projected into the molding gap to form the through-hole at a specified site of the synthetic resin molded article. |
