What is the difference between a single screw extruder and a twin screw extruder?
Single-screw machine and twin-screw machine: one is a screw, the other is two screws. Both are driven by a motor. The power varies with different screws. The power of 50 cone double is about 20KW, and the power of 65 is about It is 37KW. The output is related to the material and the screw. The output of 50 cones is about 100-150KG/H, and the output of 65 cones is about 200-280KG/H. The output of single screw is only half. The single-screw extruder occupies an important position as a plasticizing and granulating machine or a molding and processing machine. In recent years, the single-screw extruder has made great progress. The main sign of the development of single-screw extruder lies in the development of its key part, the screw. In recent years, people have carried out a lot of theoretical and experimental research on the screw, so far there are nearly one hundred kinds of screw, the common ones are separation type, shear type, barrier type, split type and wave type.
The twin-screw extrusion granulator has the advantages of less heat generated by friction, relatively uniform shearing of the material, large conveying capacity of the screw, relatively stable extrusion volume, long residence of the material in the barrel, and uniform mixing. The twin-screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, exhaust, reaction and self-cleaning functions than single-screw extruders, and 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.
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, new and special single-screw extruders with more characteristics will emerge. In general, single-screw extruders are developing in the direction of high speed, high efficiency and specialization.
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