Patent ID: 6767482
Filing Date: 2004-07-27
Classification: B29C,B29L,Y10S

Abstract:
An injection compression molding method, comprising the steps of:providing an openable/closable molding die having at least one cavity including a pair of relatively movable cavity forming members and a resin flow channel in communication with the cavity through a gate having a gate passage; closing the molding die; setting a size of the cavity by relatively moving the pair of cavity forming members to form a predetermined compression margin inside the cavity; injecting molten resin to fill the cavity; and reducing the size of the cavity by relatively moving the pair of cavity forming members to compress the molten resin, the reducing starting during a time period that extends between a first time point prior to completion of injection of the molten resin and a second time point after the completion of the injection of the molten resin; wherein the gate shuts the gate passage after completion of injecting the molten resin; and wherein an operation that shuts the gate passage is conducted during the relative movement of the pair of cavity forming members in reducing the size of the cavity to compress the molten resin.