Injection molding is one of the most uses process. That major advantage of the process include its versatility in moulding a wide range of production rate, the ease with which automation can be introduce, the possibility of high production rates and the manufacture of articles with close tolerance. But that is met difficulty when we product the part which is large or has rib because too high pressure or shrinkage.
Gas injection molding process one of the appicated process of injection Molding has no sink mark and its maximum pressure is below that of conventional injection molding process. But its filling process is not known because its short developing history. So, my purpose is presurposing thickness of product and processing time by numerical analysis.