extruder includes screw, barrel, gearbox,dose feeding, auto feeder, motor driver, and control ... followings: the material of all of parts is 38CrMoAL 1. screw is 51/107mmm of diameter,speed is 1-42r/min ... length is 1070mm2. barrel, heating mode is cast aluminum heating ring, adopts the barrel fan cooling. 3. gearbox, adopts inner cycling ...