... agitator, feed trandsmission case with lubricant grease, hopper material is stainless steel3)Hight speed hight torque gearbox, reduction ratio ... with vacuum hardening at high temperature. The whole hardness is HRC58~60.5)Charging barrels: 11barrels in all, ... which effect is good, heater insulating resistance against ground is not less than 10 MΩ,heating power is ~20kw double screw extruderparallel ...