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The Difference Between Parallel Twin-Screw And Conical Twin-Screw

- Jan 09, 2019 -


  The Difference between Parallel Twin-Screw and Conical Twin-Screw


 According to whether the axis of the twin-screw is parallel or not, it can be divided into two extruders in which the axial line is parallel and the axial line intersects. The axial line is parallel to the twin-screw extruder, and the axial line intersects the conical twin-screw extruder.

 

  Is the parallel twin-screw extruder good, or is the conical twin-screw extruder good? It is a topic that users often ask when purchasing a twin-screw extruder.

Classification of twin-screw extruders

  According to the direction of rotation of the twin-screw, the extruder can be divided into two extruders: the same direction and the opposite direction. The same direction extruder has the same rotation direction when the two screws work, and the counter-rotating machine refers to two screws. The direction of rotation is opposite when working.

  According to whether the axis of the twin-screw is parallel or not, it can be divided into two extruders in which the axial line is parallel and the axial line intersects. The axial line is parallel to the twin-screw extruder, and the axial line intersects the conical twin-screw extruder.


Twin-screw extruders also have a meshing and non-engaging component.

  The parallelism is similar to that of a conical twin-screw extruder: there is a transfer mechanism for forced advancement of plastics, good mixing plasticizing ability and dewatering capacity, and basically the same adaptability to the molding process of materials and plastic products.


Parallel to the difference between a conical twin-screw extruder

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

  2. 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 varies along the axis.

  3. Length to diameter ratio: Parallel double screw (L/D) refers to the ratio of the effective length of the screw to the outer circle of the screw. Conical twin screw (L/D) refers to the effective length of the screw and the diameter of the large end and small The ratio of the uniform values of the end diameters.


  From the above, we can clearly see that the most obvious difference between parallel and conical twin-screw extruders is that the geometry of the screw barrel is different, which leads to many differences in structure and performance. Although the two characteristics are different, But have their own advantages.

  Parallel twin screw extruder

  Due to the small size of the center distance of the two screws, in the transmission gearbox, the space for the radial and thrust bearings supporting the two output shafts and the associated transmission gears is limited, although the designer has tried his best, it cannot be solved. The bearing capacity of the bearing, the modulus of the gear, the small diameter, and the small diameter of the tail of the two screws result in poor torsion resistance. The output torque is small and the load resistance is poor, which is the most obvious defect of the parallel twin-screw extruder. However, the plasticity of the aspect ratio is the upper wind of the parallel twin screw. It can increase and decrease the aspect ratio to meet the requirements of the plastic processing process according to the difference of molding conditions, and can expand the application range of the parallel twin screw, but this point is tapered. Twin screw extruders are difficult to achieve.


Conical twin screw extruder

  The two conical screws are horizontally arranged, and the two axes are inserted into the barrel at an 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 large center distance. The gears and gear shafts in the transmission system and the radial and thrust bearings supporting these gear shafts have a large installation space, which can accommodate larger radial bearings and thrust bearings, each of which has sufficient transmission torque. The diameter of the shaft, so the large working torque and large load capacity is a major feature of the conical twin-screw extruder. This parallel twin-screw extruder is incomparable.