The Do / Di of HKV series deep groove twin-screw extruder is 1.8. Compared with the standard machines, the deeper cut screw channel free volume is considerably high. The machine is suitable for processing: materials with low bulk density, high filling, degassing process, polymer reaction, materials with low specific energy consumption such as food and drugs, powder coatings, etc. The remarkable features of this machine are: improving the feed intake of low bulk density materials; low average shear stress; less screw shear for low temperature increase; large free volume and longer residence time of materials in machine.