Plastic extruders are divided into twin-screw extruders and single-screw extruders.
Single-screw extruders hold an important position in both plasticizing and granulation machinery and molding processing machinery. In recent years, single-screw extruders have seen significant development. Large-scale granulation single-screw extruders manufactured in Germany have screw diameters up to 700mm and a production capacity of 36t/h.
The main indicator of the development of single-screw extruders lies in the development of its key component-the screw. In recent years, extensive theoretical and experimental research has been conducted on screws, resulting in nearly a hundred types of screws, commonly including separating, shearing, barrier, diverting, and corrugated types.
Twin-screw extruders have good feeding characteristics, making them suitable for powder processing. They also offer better mixing, venting, reaction, and self-cleaning functions than single-screw extruders. Their superiority is particularly evident when processing plastics with poor thermal stability and blends.
