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Extruder Classification

- Aug 07, 2018 -

Plastic extruder is divided into twin screw extruder and single screw extruder

The difference between the two extruders:

Single-screw machines and twin-screw machines: one is a screw and the other is two screws. Both are driven by a motor. The power varies from screw to screw. The power of the 50 cone double is about 20 kW, and the output of 65 is about 37 kW. The output is related to the material and the screw. The output of the 50 cone double is about 100-150 kg/h, and the 65 cone double is about 200-280 kg/h. The output of a 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. Applicable to the production of tubes, 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. A large-scale single-screw extruder for granulation in Germany with 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 a hundred 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 relatively perfect, 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.