Whether Twin-screw Extruder Should Be Parallel or Conical

The difference between parallel and conical twin-screw extruders:

1. Diameter: The diameter of the parallel twin-screw is the same, and the diameter of the small end of the conical twin-screw is different from the diameter of the large end.
   

2. Center distance: The center distance of the flat twin-screw is the same, the two axes of the conical twin-screw form an angle, and the size of the center distance changes along the axis.

3. Length-to-diameter ratio: Parallel twin-screw (L/D) refers to the ratio of the length of the useful part of the screw to the outer circle of the screw, and conical twin-screw (L/D) refers to the ratio of the length of the useful part of the screw to the diameter of the small end, Conical twin-screw usually only indicates the diameter value of the large end/small end of the screw (D/d).

Advantages and disadvantages of parallel and conical twin-screw extruders:

The plasticity of the aspect ratio of the parallel twin-screw extruder is the advantage of the parallel twin-screw. It can increase or decrease the aspect ratio according to the difference in molding conditions to meet the requirements of plastic processing technology, and can expand the scope of application of the parallel twin-screw. However, the loading capacity of bearing, the modulus of the gear, the small diameter, and the small diameter of the tail of the two screws lead to poor torque resistance, that is, small output torque and poor load resistance. The conical twin-screw extruder can withstand larger radial bearings and thrust bearings, and each transmission shaft has a shaft diameter sufficient to meet the transmission torque, so large working torque and large load are the advantages of conical extruders. A great feature. This parallel extruder is incomparable.

Jiangsu Xinrongplas Machinery Co., Ltd. has been engaged in plastic extrusion equipment for more than 26 years, if you are interested in our products, please contact us!