How to distinguish between single-screw and twin-screw plastic extruders?

Plastic extruders are divided into twin-screw extruders and single-screw extruders, as well as multi-screw extruders and non-screw extruders that are not commonly seen. Here mainly talk about the difference between single-screw and twin-screw extruders:
Single-screw machine and twin-screw machine: one is one screw, the other is two screws, both are driven by a motor, the power varies with different screws, the power of 50 cone twin is about 20KW, and the power of 65 is about 20KW. It is 37KW. The output is related to the material and the screw. The output of 50 cone double is about 100-150KG/H, the output of 65 cone double is about 200-280KG/H, and the output of single screw is only half.
Extruders can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws. At present, single-screw extruders are widely used and are suitable for extrusion processing of general materials. The twin-screw extruder has less heat generated by friction, relatively uniform shearing of the material, large screw conveying capacity, relatively stable extrusion volume, long residence time of the material in the barrel, and uniform mixing.
SJSZ series conical twin-screw extruder has the characteristics of forced extrusion, good quality, wide adaptability, long life, low shear rate, difficult decomposition of materials, good mixing and plasticizing performance, direct molding of powder materials, etc., with automatic temperature control , Vacuum exhaust and other devices. It is suitable for the production of pipes, plates, special-shaped materials and other products.
The single-screw extruder occupies an important position both as a plasticizing and granulating machine or as a molding processing machine. In recent years, the single-screw extruder has made great progress. At present, the single-screw extruder for large-scale granulation produced in Germany has a screw diameter of 700mm and an output of 36t/h.
The main sign of the development of single-screw extruder lies in the development of its key parts - the screw. In recent years, people have carried out a lot of theoretical and experimental research on the screw, and there are nearly a hundred kinds of screws, the common ones are separation type, shear type, barrier type, shunt type and wave type.
From the perspective of single-screw development, although single-screw extruders have been relatively perfect in recent years, with the continuous development of polymer materials and plastic products, more characteristic new-type screws and special single-screw extruders will emerge. Generally speaking, single-screw extruders are developing towards specialization.
The twin-screw extruder has good feeding characteristics and is suitable for powder processing. It has better mixing, exhaust, reaction and self-cleaning functions than the single-screw extruder. It is characterized by processing plastics and blends with poor thermal stability. It shows its superiority even more. In recent years, foreign twin-screw extruders have developed greatly. Various forms of twin-screw extruders have been serialized and commercialized, and there are many manufacturers.