How do twin screw extruders differ from single screw extruders ?
A .The twin screw was developed to overcome the limitations of the single screw extruder, and can be compared to the ” next generation ” of the single screw unit. With a twin screw extruder, you have the following advantages : Better control of product flow In a twin screw extruder, the dual screw action conveys the product through the barrel. In a single screw extruder, friction between the screw and the barrel is used to convey the rpoduct. Single screw extruders offen experience slippage and surging. Slippage occurs when high pressure in the barrel causes the product to slip between the screws and the barrel wall. The result is that the product does not undergo proper cooking or processing. Surging occurs when the product is held back from proper flow. Presure builds up, and finally, the product bursts uncontrollably through the die. This can result in undercookked and misshapen products. Better control of processing factors All the processing parameters : temperature, presure, scre
