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What are the specific differences between single screw and double screw plastic extruders?
Source: | Author:佚名 | Published time: 2013-05-30 | 50 Views | Share:

Single screw machine and twin screw machine: one is a screw, and the other is two screws. Both are driven by a motor, and the power varies depending on the screw. The power of the 50 cone twin is about 20KW, and the power of the 65 cone twin is about 37KW. The output is related to the material and screw, with the 50 cone twin producing about 100-150KG/H and the 65 cone twin producing about 200-280KG/H. The output of the single screw is only half.

Extruders can be divided into single screw, twin screw, and multi screw extruders based on their number of screws. At present, single screw extruders are the most widely used and suitable for extrusion processing of general materials. The twin screw extruder has the advantages of less heat generated by friction, more uniform shearing of the material, larger conveying capacity of the screw, more stable extrusion volume, long residence time of the material in the barrel, and even mixing.

The SJSZ series conical twin screw extruder has the characteristics of forced extrusion, high quality, wide adaptability, long service life, low shear rate, difficult material decomposition, good mixing and plasticization performance, direct powder forming, temperature control, vacuum exhaust and other devices. Suitable for the production of products such as pipes, plates, and shaped materials.

Single screw extruders play an important role as both plasticizing and granulating machinery and forming processing machinery. In recent years, single screw extruders have made great progress. At present, the large-scale single screw extruder for granulation produced in Germany has a screw diameter of 700mm and a production capacity of 36t/h.

The main symbol of the development of single screw extruders lies in the development of their key component - the screw. In recent years, a large amount of theoretical and experimental research has been conducted on screws, and there have been nearly a hundred types of screws, including separation type, shear type, barrier type, diversion type, and wavy type.

From the perspective of single screw development, although single screw extruders have become more mature in recent years, with the continuous development of polymer materials and plastic products, more distinctive new types of screws and special single screw extruders will emerge. Overall, single screw extruders are developing towards high speed, efficiency, and specialization.

The twin screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, exhaust, reaction, and self-cleaning functions than the single screw extruder. The characteristic is that it shows its superiority when processing plastics and blends with poor thermal stability. In recent years, there has been significant development in foreign twin screw extruders, and various forms of twin screw extruders have been serialized and commercialized, with many manufacturers producing them.