| 摘要 |
PURPOSE:To exactly prevent the occurrence of a sink mark in a molding even when the thickness of the molding is unequal by a method in which when molten resin in molds is being hardened by cooling, the back side of the thick portion of the molding is pressed in a sliding manner by a presser part in the molds. CONSTITUTION:Molten resin is injected into molds 3 by an injector 2 and hardened by cooling. During the cooling period, the thick portion 1a of a molding 1 is pressed in a sliding manner by sliding a presser part 4 by means of a driver 5 until the resin is hardened. |
