INJECTION MOLDING METHOD FOR RUBBER MATERIAL AND ITS DEVICE

摘要

PURPOSE:To enhance yield of good products by eliminating completely pinholes of gas vent generated at the time of molding a rubber material and also eliminating the shortage of filling of the rubber material into a cavity at the time of filling. CONSTITUTION:A rubber material is injected in the state of forming a clearance (t) on a parting face of injection moldings 3b and 4b, and the rubber material is filled into a cavity 5 of the parting face, and then the clearance (t) of the parting face is gradually narrowed while repeating opening and closing of a mold and the mold clamping force is increased step by step.