Other machines use a plasticating extruder to melt the plastic and piston to inject it while some have been designed to use a screw for Both jobs.

• 有的机器用一个塑化挤压器来熔化塑料,用一个活塞进行注射。另外,还有一些已设计出来的机器采用一个螺杆来完成熔融和注射。