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High Efficiency Single Screw Extruder Development Point Of View
- Aug 27, 2017 -

High Efficiency Single Screw Extruder Development point of view

The plastic extruder is divided into twin screw extruder and single screw extruder.

The difference between the two extruders:

Single-screw machine and twin-screw machine: one is a screw, one is two screws, are driven by a motor. The power varies depending on the screw. 50 cone double power is about 20kW, 65 is about 37kW. Yield and material and screw, 50 cone double production is about 100-150kg / h, 65 cone double about 200-280kg / h. Single screw production is only half.

The extruder can be divided into single screw, twin screw and multi screw extruder according to its screw number. At present, the most widely used single screw extruder is suitable for the extrusion of general materials. Twin screw extruder due to the friction generated by less heat, the material is more uniform shear, the screw conveying capacity is larger, the extrusion is relatively stable, the material in the barrel to stay long, mixed evenly.

SJSZ series of conical twin-screw extruder with forced extrusion, high quality, wide adaptability, long life, low shear rate, easy decomposition of materials, mixing plasticizing performance, powder molding and other characteristics, temperature control, Vacuum exhaust and other devices. Applicable to the production of tubes, plates and profiled products.

Single screw extruder both as a plasticizing granulation machinery or forming processing machinery have an important position in recent years, single screw extruder has been a great development. German production of large-scale granulation with a single screw extruder, screw diameter of 700mm, the output of 36t / h.

The main sign of the development of single screw extruders lies in the development of its key parts - screw. In recent years, people have carried out a lot of theoretical and experimental research on the screw, has been nearly 100 kinds of screw, common separation, shear type, barrier type, shunt type and wave type.

From the development of single screw, although the single screw extruder has been more perfect, but with the continuous development of polymer materials and plastic products, but also the emergence of more features of the new screw and special single screw extruder. In general, the single screw extruder is oriented towards high speed, high efficiency and specialization.

The twin-screw extruder has good feed characteristics and is suitable for powder processing and has better kneading, exhaust, reaction and self-cleaning functions than single-screw extruders, which are characterized by poor thermal stability of plastics and blends Material when it shows its superiority. In recent years, foreign twin-screw extruder has been a great development, various forms of twin-screw extruder has been serialized and commercialized, the production of more manufacturers, generally classified as follows:

⑴ by two axis relative position, there are parallel and cone of the points;

⑵ by two screw meshing procedures, there are meshing and non-meshing type of points;

⑶ according to the direction of rotation of two screws, with the direction and the opposite of the points, in the opposite direction there are inward, outward points;

⑷ by the screw rotation speed, high speed and low speed of the points;

⑸ by screw and barrel structure, there is a whole and the combination of points.

In the twin-screw extruder on the basis of, in order to more easily deal with poor thermal stability of the blends, and some manufacturers have developed a multi-screw extruder, such as planetary extruder.