Screw extruder, including single screw extruder and twin screw extruder, is the most commonly used method of polymer processing, and it was in 1930s that twin screw extruder came into being era.

In accordance with the direction of the two screws’ relative rotation, an extruder can be divided into two broad categories: the rotation and varies with the rotating. In 1960s, appearing on behalf of the two axes is not parallel conical twin screw extruder machine, which belongs to the counter-rotation. With high stability, counter rotating twin screw extruder is mainly used for pipe, profile and so on, demanding cross-section size extrusion products and it is used as a host in the current window and door profile production. Co-rotating twin screw extruder is applied for mixing, and mixture occupies an important position in polymer processing (above the polymer need to be final products before going through the mixture screw). Nowadays, the extrusion system of co-rotating twin screw extruder mainly uses modular structure, the barrel assembly, and the screw components.