The extruder is a kind of plastic machinery commonly used in the modified plastics industry, which is widely used in the polymer processing industry and other production and processing fields. Extruders can be divided into single screw extruder and twin screw extruder, their working principles and application fields are different, each has its own advantages and disadvantages.

First of all, there are many differences between single screw extruder and twin screw extruder in terms of plasticizing capacity, material conveying method, and speed occasion cleaning:
1. Different plasticizing properties: single screw is suitable for polymer plastic extrusion and granular material extrusion. The shear degradation of polymer is very small, but the material stays in the extruder for a long time, and the twin screw is mixed Good plasticizing ability, short residence time in the extruder, suitable for powder processing.
2. The material conveying mechanism is different: the material conveying in the single screw extruder is drag flow, the solid conveying process is friction drag, and the melt conveying process is viscous drag. The friction coefficient between the solid material and the metal surface and the viscosity of the melt material are very large. The above determines the conveying capacity of the single screw extruder.
3. Cleaning at different speeds: The speed distribution of the single screw extruder is clear and easy to describe, while the speed distribution of the twin screw extruder is more complicated and difficult to describe, which is mainly due to the meshing area of ​​the twin screw extruder.
4. Different self-cleaning: The twin screw extruder has a fast shearing speed, because the spiral ribs and spiral grooves have opposite speeds in the meshing area, and the relative speed is fast. Any accumulated material attached to the screw can be scraped off, and the material has good properties. The self-cleaning effect, the material residence time is short, and it is not easy to be locally degraded. The single screw extruder does not have this function.
In addition to different working principles, twin-screw extruders also have different application fields. Twin-screw extruders are widely used in physical and chemical modification of matrix resins, such as filling, strengthening, toughening, reactive extrusion, etc. The single screw extruder is mainly used in the fields of pipes, plates, plates and profiles.