Conical Twin-screw Increases The Production Capacity Of The Extruder

The conical twin-screw is different from the parallel twin-screw in appearance, the diameters at both ends are different, the diameter of the feeding section is large, while the diameter of the homogenizing section is small, and the middle is a gradual transition. The conical twin-screw is an intermeshing type, most of which are counter-rotating. Two conical screws mesh with each other and rotate in different directions in the barrel, and there is a reasonable gap between the top of the flight of one screw and the root of the other screw. Due to the counter-rotation, the spiral progress of the material on one screw is blocked by the other screw, and the material can only advance axially through the gaps of each part under the push of the thread.
When the material passes through the radial gap between the two screws, it is like passing through the gap between two rollers. The stirring and shearing are very strong. Therefore, the plasticization of the material is very uniform, and it is especially suitable for processing PVC plastics. The compression ratio of the conical twin-screw is not only formed by the depth of the screw groove from deep to shallow, but also formed by the outer diameter of the screw from large to small, so the compression ratio is quite large, so the material is more fully plasticized in the barrel, More uniform, to ensure the quality of the product. In this way, under the premise of ensuring the quality, the rotation speed of the extruder can be increased, thereby increasing the production capacity of the extruder.