According to the number of screw, extruders can be divided into single screw, twin screw and multi-screw extruder.

At present, the single screw extruder has been the most widely used in the world, in general the extrusion processing of materials.

Due to less heat generated by friction and average material shear, twin screw extruder has greater transmission capacity with advantages of stable extrusion volume and mixed evenly.

However, the characteristics of the conical twin screw extruder are as follows: forced extrusion, high quality, wide adaptability, longevity, small shear rate, hard to break down materials, good mixing performance plastics, direct molding and so on with the temperature-controlled, vacuum exhaust and other devices. It is applied to produce tubes, boards and special-shaped materials.