The extruder can be divided into single-screw, twin-scr […]
The extruder can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws.
It is now the most widely used single-screw extruder and is suitable for extrusion of general materials.
Single-screw extruders play an important role both as plasticizing granulation machines and forming processing machines. In recent years, single-screw extruders have been greatly developed. The large-scale single-screw extruder for granulation in Germany now has a screw/diameter of 700 mm and a production value of 36 t/h.
The main sign of the single-screw extruder is the development of its key component, the screw. In recent years, many theoretical and experimental studies have been carried out on the screw. Up to now, there have been nearly a hundred kinds of screws, and the common ones are different types, shear type, barrier type, split type and wave type.
From the point of view of single-screw development, although the single-screw extruder has been perfected in recent years, with the continuous development of polymer materials and plastic products, new-type screws and special single-screw extruders with more characteristics will emerge. Overall, the single-screw extruder is moving toward high speed, high efficiency, and specialization.