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The difference between parallel and conical twin screw extruder

Update:01-02-2021
Summary:

Many people will be entangled with parallel screw, or c […]

Many people will be entangled with parallel screw, or conical screw! In other words, how to distinguish, then let us introduce these two extruders!
  The difference between parallel and conical twin screw extruder:
  1. Concentric distance: The center distance of the flat twin screw is the same, the two axes of the conical twin screw are at an angle, and the size of the center distance changes along the axis.
  2. 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.
        3. Length to diameter ratio: Parallel double screw (L/D) refers to the ratio of the effective part length of the screw to the outer circle of the screw, and conical twin screw (L/D) refers to the effective part length and the diameter of the large end of the screw. The ratio of the average of the end diameters.


   twin screw extruder
Due to the small size of the center distance between the two screws, in the transmission gearbox, the space for the radial bearings and thrust bearings supporting the two output shafts and related transmission gears is very limited. Although the designer has tried his best, it cannot be solved. The bearing capacity, the gear module, the small diameter, and the small diameter of the tails of the two screws result in poor torsion resistance. The small output torque and poor load-bearing capacity are the obvious defects of the parallel twin-screw extruder. However, the plasticity of the length-diameter ratio is the advantage of the parallel twin screw. It can increase and decrease the length-diameter ratio according to the difference in molding conditions to meet the requirements of plastic processing technology. It can expand the application range of the parallel twin screw, but this point is conical. Twin screw extruder is difficult to achieve.
   Conical twin screw extruder
The two conical screws are arranged horizontally, and the two axes are installed into the barrel at an included angle. The center distance of the two axes gradually increases from the small end to the large end, so that the two output shafts of the transmission gear box have a larger center distance. The gears and gear shafts in the transmission system, as well as the radial bearings and thrust bearings supporting these gear shafts, leave a large installation space. It can be equipped with larger specifications of radial bearings and thrust bearings, and each transmission shaft has enough to transmit torsion. Because of the long shaft diameter, large working torque and large load-bearing capacity are a major feature of the conical twin-screw extruder. This parallel twin screw extruder is incomparable.

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