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压注成型亦称铸压成型。 是将塑料原料加入预热的加料室内，然后把压柱放入加料室中锁紧模具，通过压柱向塑料施加压力，塑料在高温、高压下熔化为流动状态，并通过浇注系统进入型腔逐渐固化成塑件。 此种成型方法，也称传递模塑成型。 压注成型适用于各低于固性塑料，原则上能进行压缩成型的塑料，也可用压注法成型。但要求成型物料在低于固化温度时，熔融状态具有良好的流动性，在高于固化温度时，有较大的固化速率 。
Pressure injection molding is also known as cast molding. The plastic raw material is added into the preheating feeding chamber, and then the pressure column is put into the feeding chamber to lock the mold. The pressure is applied to the plastic through the pressure column. The plastic melts into the flow state under high temperature and high pressure, and enters the mold cavity through the gating system and gradually solidifies into the plastic parts. This molding method is also called transfer molding. The pressure injection molding is suitable for the plastics which are lower than the solid plastics. In principle, the plastics that can be compressed can also be molded by the pressure injection method. However, it is required that when the molding temperature is lower than the curing temperature, the melting state has good fluidity, and when it is higher than the curing temperature, it has a higher curing rate.