SJ series co-rotating twin screw extruder is adopted an accumulative structure in assembling elements, by changing difference parts for different materials processing technology to meet users’ requirements. To achieve machine’s multi-purpose. Extruder gear box designing is and structure is compact which feature high rotation speed, high torque output and stable running. The extruder barrel is double-layer making from wear-proof alloy steel a301, hardness HRC60-64. The extruder screw is made from high-speed tool steel W6Mo5Cr4Vo2, vacuum hardening reach HRC58-62, having strong wearability and long life use. Extruder temperature adopts digital control system to realize temperature accurate control automatically. Head of extruder equipped with pressure sensors and melt temperature measurement thermocouple to inspect and control extrusion conditions, and to meet the technical requirements for various materials processing.