Advantages of a twin screw extruder

          As compared with a single screw machine, one of the chief advantages of a twin screw extruder, is that the twin screw equipment running more times in the manner of a positive displacement pump. In other words, with single screw extruders there is considerable fore and aft movement of the material when it progresses along the length of the barrel (such machines can be characterized as drag flow devices), and this can arouse inefficiencies, especially when extremely viscous materials are going through processing. As far as a twin screw machine though, this fore and aft "slippage" of material during processing is thoroughly reduced or washed out. Thus, in processing extremely viscous material such as synthetic resins or something similar, twin screw extruders are generally the apparatus of preference.