introduction of twin conical screw extruderThe conical twin screw is different from the parallel twin screw in shape. The diameters of the two ends are different. The diameter of the feeding section is large, and the diameter of the homogenizing section is small. The middle is gradually transitioned. The conical twin-screw is meshing type, and most of them are counter-rotating. The two conical screws mesh with each other and rotate in opposite directions in the barrel. The top of the screw edge of one screw has a reasonable gap with the root of the other screw. Due to the counter-rotation, the path of the screw on one screw is blocked by the other screw, and the material can only advance axially through the gap of each part under the push of the thread.
When the material passes through the radial gap between the two screws, just like the gap between the two rollers, the stirring and shearing are very strong. Therefore, the plasticization of the material is very uniform, which is particularly suitable for processing PVC plastics. The compression ratio of the conical twin screw is not only formed by the groove from deep to shallow, but also 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 products. In this way, on the premise of ensuring quality, the speed of the extruder can be increased, thereby increasing the production capacity of the extruder.
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