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Structure composition and working process of second-hand double screw parallel rod extruder

Date:Aug 12, 2020

  The second-hand double screw parallel rod extruder is one of the types of plastic machinery, which originated in the 18th century. According to the material flow direction of the die head and the angle between the center line of the screw, the extruder can divide the die head into right angle die head and oblique angle die head.

   Screw extruder relies on the pressure and shear force generated by the rotation of the screw, which can make the material can be fully plasticized and uniformly mixed, and formed through the die. Plastic extruders can be basically classified into twin-screw extruders, single-screw extruders, and rare multi-screw extruders and screw-less extruders.

   The energy saving of the second-hand double screw parallel rod extruder can be divided into two parts: one is the power part and the other is the heating part.

Energy saving in the power part: Most of the inverters are used. The energy saving method is to save the residual energy of the motor. For example, the actual power of the motor is 50Hz, and you actually only need 30Hz in production to produce enough, and the excess energy consumption is in vain When it is wasted, the frequency converter is to change the power output of the motor to achieve energy saving effect.

   Energy saving in heating part: Most of the energy saving in heating part is energy saving by using electromagnetic heater, and the energy saving rate is about 30%~70% of the old resistance coil.

  The working process of a second-hand double screw parallel rod extruder

The plastic material enters the extruder from the hopper, and is transported forward by the rotation of the screw. During the forward movement, the material is heated by the barrel, shear and compression caused by the screw to melt the material , Thus realizing the change between the three states of glass state, high elastic state and viscous flow state.

  In the case of pressurization, the material in the viscous flow state is passed through a die with a certain shape, and then according to the die, it becomes a continuum with a cross-section similar to the die. Then it is cooled and shaped to form a glassy state, thereby obtaining the workpiece to be processed.


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