With the continuous improvement of production, manufacturing and processing technology of twin screw extruders, not only feeding and plasticizing, but also dehydration, drying and other processes are required. In order to better meet the different needs of users, twin screw extruders must constantly improve their work efficiency and seek ways to improve product quality.
The resistance method is used to measure the temperature at each temperature measuring point of the twin screw extruder. There is usually a circular hole with a diameter of 5-6 mm at the corresponding position of the barrel, and a thermistor is inserted. Strict temperature control and temperature control are crucial for maintaining the main performance of the twin screw extruder and can also improve its production efficiency.
The heat transfer of high polymers is poor, which may cause viscosity loss due to shear. This thermal energy can only be dissipated through heat transfer from the generated material to the barrel and the screw of the extruder. It reflects that the extrusion process is carried out under certain temperature conditions.
The temperature of the rear cylinder is more important because it affects the conveying speed of solid materials during meshing or feeding.
Overall, some of the thermal energy is converted into thermal energy by the mechanical energy of the engine, but because most reactions are exothermic, heating or removing excess heat during extrusion is critical.
The material undergoes a transition from glass to a melted state during extrusion. In addition to the heat and thermal balance required for stabilizing material plasticization and achieving ideal plasticization, melt pressure is also a very important control indicator. Considering the influence of mold resistance and screw compression ratio on the material during extrusion, there is no constant pressure phenomenon. For different mouth molds, the balance and stability of each section of the screw remain basically unchanged.
Under the condition of constant extrusion speed, increasing or decreasing the feeding speed, changing the spiral material amount in the feeding section, and ensuring that the material amount in the discharge section remains unchanged, thus making the feeding section and compression section increase or decrease the melt pressure with the change of compression ratio. Under the condition of constant feeding speed, increase or decrease the extrusion speed; adjust the material capacity of the screw in the feeding section.
The material capacity on the exhaust pipe is constant, so the feeding section and compression section increase or decrease with the change of compression ratio, and the feeding pressure also increases or decreases accordingly. Because the material capacity of the feeding section screw remains unchanged, the melt pressure is only caused by the increase or decrease of speed.
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