Difference between single screw and double screw extruder


Compared to single screw extruder, double screw extruder has the below features:

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1) Material flow is stable, uneasy happen cutoff or billow, the productive process is reliable.
2) Most heat of double screw extruder mainly comes from mechanical transformation during operation, a small amount of heat comes from the heating jacket. The single screw extruder often requires additional equipment preheat quenched materials.
3) Time distribution is a relatively narrow range of material retained in the machine, which is easier to control the temperature of the material, sufficient energy utilization, yield and quality are very stable.
4) Double screw extruder has a screw surface self-cleaning effect so that the transportation of materials is stable, little residual material in the cavity when finish working, and no need stop to cleaning if change the production material.
5) Double screw extruder has large productivity, is appropriate for the processing of materials containing high oil (> 17%) and high humidity of materials (more than 30% moisture content)

Double screw extruder has a complex structure, request high precision machining, therefore, investment for production facilities is much greater if select this type, so whether select it according to the actual situation.


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