Product Description 1. SJ Series Single Screw Extruder used for Pellet Material Extrusion Line. 2. Coordinated with the appropriate auxiliary machine. (including the head of former, it can produce many kinds of plastic products such as film 3. Advanced in design, high in output, good in plasticization and low in energy consumption. The involutes gear driving is characterized by low noise, stable working, big bearing capacity and long service life.