SJ series extruder is general and professional equipment for various kinds of material. As it adopted professional process technology and made the screw and barrel in high precision and linearity, Also extruder use Compact design gear box with high ratings through utilization of optimum case hardened gears with reasonable construction. Furthermore, customer can choose imported and domestic parts according to their different requirements with customized screw, so the extruder in high plasticization, reasonable design, and it became the head of modern plastic extruder industry.