According to the number of screws, they can be divided into single screw, twin screw, triple screw and multi screw. Twin screw can also be divided into parallel twin screw and conical twin screw. The most significant difference between parallel twin screw extruders and conical twin screw extruders is that the geometric shape of the screw barrel is different, which leads to many differences in structure and performance. Although they have different characteristics, they have their own advantages.

Conical twin-screw extruder: two conical screws are horizontally arranged, and the two axes are installed into the barrel at an included angle. The center distance between the two axes gradually increases from the small end to the large end, making the two output shafts of the transmission gearbox have a large center distance. The gears and gear shafts in these transmission systems, as well as the radial bearings and thrust bearings supporting these gear shafts, have a large installation space, which can be used to install larger radial bearings and thrust bearings, Each transmission shaft has a shaft diameter sufficient to meet the transmission torque, so large working torque and large load bearing capacity are a major feature of the conical twin-screw extruder. This parallel twin screw extruder is incomparable.