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The importance of twin-screw extruders to improve production efficiency

by:TENGDA     2022-10-10

The twin-screw extruder has developed rapidly, its output, torque and speed have been greatly improved, and its application has become increasingly widespread. Improving the production efficiency of the co-rotating twin-screw extruder, improving the product quality and realizing the multi-function of the equipment are the basic requirements for realizing its high performance, and it is also the difficulty of research and development. Increasing the free volume of the channel is also an important factor. In the feeding section and devolatilization section, it is very necessary for the screw element to have a large free volume. For bulk density materials, increasing the free volume of the feeding section and the filling degree of the material in the screw groove can greatly improve the production of the extruder. ability.

To increase the torque and speed, the deceleration distribution box needs to be carefully designed. In order to greatly improve the torque index of the equipment, higher requirements must be put forward on the design and manufacturing level of the transmission case. The higher the torque, the higher the requirements for the design, manufacturing accuracy, material strength and heat treatment of the gears, output shafts, bearings and other parts in the transmission case. higher. Because the free volume of the threaded element needs to be increased, the center distance between the two screws will be reduced when the outer diameter of the screw remains unchanged, which will inevitably make the problem of insufficient installation space for the proportioning gear and thrust bearing more prominent.

The improvement of production efficiency of twin-screw extruder is one of the important goals of the development of new co-rotating twin-screw extruder. Under the same screw speed, increasing the depth of the screw groove can greatly increase the conveying capacity. Correspondingly, the plasticizing and mixing capacity of the screw is required to increase, which requires the screw to withstand a larger torque. At high screw speed, the residence time of the material in the extruder is reduced, which may cause insufficient plasticization, melting and mixing of the material. For this reason, it is necessary to appropriately increase the screw length, which will inevitably lead to an increase in the actual bearing torque and power of the twin-screw extruder.

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