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Term Definition
Gas Injection Moulding

This involves the injection of nitrogen gas along with the polymer (usually just after the first injection phase is completed). The nitrogen can be injected either through a special machine nozzle and follows the path of the sprue / runner or it can be injected directly into the part through special nozzles built into the mould. The gas is then evacuated from the part during the later stages of the cooling phase. The advantage of this type of process is that parts that contain thick wall sections can be produced without the normal sink marks that normally occur in these types of areas. The resultant part will also be lighter, with a resultant cost saving and produced in a faster time.