What are the effects of speed control of conical screw barrel on the quality of extruded products?

In the plastic processing industry, conical screw barrel is an important equipment, and its speed control has a vital impact on the quality of extruded products. So, what are the specific effects?
First, speed control directly affects the output of extruded products. When the speed of the conical screw barrel increases, the extrusion volume will also increase accordingly. This is because the increase in speed enhances the screw's ability to convey plastics, so that more plastics can be extruded per unit time. However, the increase in speed is not unlimited. Too high a speed may cause the plastic to stay in the barrel for too short a time, so that the plastic is not fully plasticized, thus affecting the quality of the product.
Secondly, speed control has an important influence on the dimensional accuracy of the extruded product. During the extrusion process, the flow velocity and pressure distribution of the plastic will change with the change of the screw speed. If the speed is unstable, it will cause uneven flow of the plastic, resulting in deviations in the size of the extruded product. Therefore, precise control of the speed of the conical screw barrel can ensure the dimensional accuracy of the extruded product and improve the quality of the product.
In addition, speed control will also affect the physical properties of the extruded product. For example, changes in speed will affect the plasticization degree and molecular orientation of the plastic. When the speed is low, the plasticization degree of the plastic may not be sufficient, resulting in low strength and toughness of the product. When the speed is too high, the plastic may be subjected to excessive shear force, causing excessive molecular orientation, thus affecting the performance of the product. Therefore, reasonable control of the speed can optimize the plasticization process and molecular orientation of the plastic and improve the physical properties of the extruded product.
In addition, speed control also has a certain effect on the appearance quality of the extruded product. If the speed is unstable, it may cause defects such as ripples, bubbles, and scratches on the surface of the extruded product. Accurate control of the speed can make the flow of plastic smoother, reduce the occurrence of these defects, and improve the appearance quality of the product.
In order to achieve precise control of the speed of the conical screw barrel, advanced control systems and speed regulation equipment are required. At the same time, it is also necessary to reasonably adjust the speed parameters according to different plastic materials and product requirements to achieve the best extrusion effect.