SJZ series conical twin screw extruder is a highly efficient agglomerating and extruding equipment. Machines of this series feature low shearing rate, uneasy degradation, even plasticiation and agglomeration, reliable quality, wide application range and long servicing life. Using PVC powder as raw material for a direct forming, the extruders perform an excellent effectiveness. These machines have automatic temperature control, vacuum gas exhaustion, oilcooled screws stepless speed regulation, as well as a forced feeding and self-cleaning mechanism.