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How can the efficiency of twin-screw extrusion granulator be improved?

by:TENGDA     2022-09-23

If you want to improve the efficiency of the twin-screw extruder, it is necessary to change the parts. This requires that in the feeding section and the 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 extrusion. production capacity of the machine. 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. To increase the torque and speed, the deceleration distribution box needs to be carefully designed. 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. Increasing the free volume of the channel is also an important factor.

Improving production efficiency is one of the important goals in the development of the new co-rotating twin-screw extruder, which can be achieved by increasing the screw speed, enhancing the plasticizing and mixing capabilities, etc. 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. 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.

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