... , gearbox,dose feeding, auto feeder, motor driver, and control panel. double screw extruder includes parts pls see the followings: the material of all ... of parts is 38CrMoAL 1. screw is 65/132mm of diameter, L/D is 22:1 ... aluminum heating ring, adopts the barrel fan cooling. 3. gearbox, adopts inner cycling water cooling, materail of axle is high alloy steel ...