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Classification of various plastic extruders and their differences

Jun 28, 2019

The classification of plastic extruders and their differences can be divided into two types: twin-screw extruders and single-screw extruders, as well as infrequently seen multi-screw extruders and screw-free extruders. The difference between the extruder: the extruder single-screw machine and the twin-screw machine: one is a screw and the other is two screws. Both are driven by a motor. The power varies with the screw. 50 cone double The power is about 20KW, and the output of 65 is about 37KW. The output is related to the material and the screw. The output of the 50 cone double is about 100-150KG/H, and the 65 cone double is about 200-280KG/H. The output of the single screw is only half. The extruder can be divided into single-screw, twin-screw and multi-screw extruders according to the number of screws. At present, the single-screw extruder is the most widely used, and is suitable for extrusion processing of general materials. The twin-screw extruder has less heat generated by friction, the shearing of the material is relatively uniform, the conveying capacity of the screw is larger, the extrusion amount is relatively stable, the material stays long in the barrel, and the mixing is uniform. SJSZ series conical twin-screw extruder has the characteristics of forced extrusion, high quality, wide adaptability, long service life, small shear rate, difficult material decomposition, good mixing and plasticizing performance, direct molding of powder, and temperature control. Vacuum exhaust and other devices. It is suitable for the production of pipes, plates, profiles and other products. Single-screw extruders play an important role both as plasticizing granulation machines and forming processing machines. In recent years, single-screw extruders have developed greatly. At present, a large-scale single-screw extruder for granulation in Germany has a screw diameter of 700 mm and a yield of 36 t/h. The main sign of the development of single-screw extruders is the development of its key component, the screw. In recent years, a large number of theoretical and experimental studies have been carried out on the screw. Up to now, there have been nearly 100 kinds of screws, and the common ones are separation type, 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. In general, single-screw extruders are moving toward high speed, high efficiency, and specialization. The twin-screw extruder has good feeding characteristics, is suitable for powder processing, and has better mixing, exhausting, reaction and self-cleaning functions than single-screw extruder. It is characterized by poor thermal stability and processing of plastics and blends. It also shows its superiority