In recent years, the speed of screw extruder has developed at an extremely high speed. However, with the continuous improvement of people's understanding, the special treatment technology of various screw extrusion processes and the trend of screw technology after replacement. The characteristics of several different screw pullers are introduced as follows: 1. The twin screw puller includes parallel double screw puller and conical double screw puller. Parallel double screw pullout machine can be divided into two directions: the same direction and the other direction. In recent years, with the rapid development of domestic electronic and electrical appliances, communications, automobile and other fields, the market demand for material modification and blending technology has increased greatly. Because of the high output of the double screw pullout machine, it is mixed. The performance of the machine is better than that of the conventional single screw casting machine, and the building block structure is easy to be adjusted according to different materials, so it has become the leading force in the processing market. 2. Single screw pullout machine is the first widely used pullout machine. Because of its simple structure and high processing efficiency, it has been widely used in the field of plastic processing and molding. Because of the small space occupied by the single screw casting machine, it has almost become the only equipment used in the field of composite processing and blow molding film. The technology of single screw pullout machine has become an important thing that can not be ignored in the processing market. It's going to be part of it. 3. The multi-screw pullout machine generally refers to the three-screw or three-screw pullout machine, which is usually designed to achieve better mixed processing effect. Compared with single screw and twin screw, its market application is much less. Planet screw feeder is a kind of multi-screw feeder which has attracted more attention in the market in recent years, which is especially suitable for the general plastic charging processing. It has better effect as a mixed feeder for molding and processing.