... B. machine configuration1, host machine: 35 cocurrent double screw extruder 2, screw diameter: 35 mm, groove depth: 6 mm3, core ... material adopt heat treatment 40CrNiMo, tempering treatment, HRC.4, screw thread element: material for high quality nitrided steel 38CrMoAlA, ... the rest for casting aluminium. Stainless steel cover.7, transmission box: domestic most advanced parallel three axis type, compact ...