Twin-screw extruder is mainly used for filling, blending, modification, reinforcement, devolatilization of chlorinated polypropylene and super absorbent resins; extrusion of degradable masterbatch, polyamide polycondensation, polyurethane addition reaction, granulation of carbon powder and magnetic powder, insulating material for cables, sheath material, low smoke and low halogen flame retardant PVC cable material and preparation of various silane crosslinks, etc.