1. When the screw speed is the same, increasing the dep […]
1. When the screw speed is the same, increasing the depth of the screw groove can greatly increase the conveying capacity. In contrast, the plasticization and mixing level of the screw must be increased accordingly, which requires the screw to withstand a larger torque. When the screw speed is high, the residence time of the material in the extruder is reduced, which may lead to plasticization and melting, and insufficient mixing. Therefore, the length of the screw must be appropriately increased, which will inevitably lead to an increase in the actual bearing torque and power of the twin-screw extruder.
2. Increasing the free volume of the spiral groove is also a key factor. The screw must have a larger free volume in the feed and devolatilization section. For loose materials, increasing the free volume of the material section and the filling degree of the material in the thread groove can greatly improve the processing capacity of the extruder.
3. The larger the torque spacing, the higher the design, manufacturing accuracy, material strength and heat treatment requirements of transmission gears, output shafts, bearings and other parts, and the higher the design accuracy of screw spindles, threaded elements, and kneading discs.