The outlet pressure of the extruder fluctuates greatly due to various factors, which will inevitably affect the dimensional accuracy of the product. The extruder itself has the function of metering. For products with high precision requirements, its metering accuracy cannot meet its needs. If we install a melt pump between the outlet of the extruder and the die, it can be used to stabilize the pressure fluctuation at the outlet of the extruder, making linear extrusion possible, thereby improving the dimensional accuracy of plastic products, in unit time Increase the output of the extruder inside. Melt pump is a kind of positive displacement conveying equipment, high-precision gear gap and volumetric structure design, make stable and balanced extrusion possible, in chemical fiber, granulation, plastic film, sheet, plate, profile, pipe, wire Cable, wire drawing, composite extrusion and other production lines have been widely used, and achieved good results.
A sheet extrusion pump is installed in the sheet extrusion production line, and the pressure at the outlet of the extruder is changed to the pressure at the die head by the melt pump. The melt pump has the functions of voltage stabilization and pressure increase. It can stabilize the pressure fluctuation at the outlet of the extruder, and achieve stable and balanced extrusion, thereby improving the dimensional accuracy of the sheet and increasing the output of the product per unit time.
It can achieve stable extrusion, improve the dimensional accuracy of extruded products, and reduce the scrap rate. In the extrusion process, it is unavoidable that the material feeding amount is not uniform, the temperature of the barrel and the head fluctuates, and the pulsation of the screw speed is unavoidable. The use of the melt gear pump can eliminate the feeding error of the feeding system, greatly reduce the fluctuation of the upstream process transmission, quickly enter a stable working state, improve the dimensional accuracy of extruded products, and reduce the scrap rate.
Increase output, reduce energy consumption, achieve low temperature extrusion, and extend machine life. Since the extruder is equipped with a polymer melt pump, the decompression function of the extruder is transferred to the gear pump to complete, the extruder can work under low pressure and low temperature, the leakage flow is greatly reduced, and the output is increased. The gear pump can establish the head pressure more easily and effectively than the extruder, and can reduce the back pressure of the extruder, so that the axial force on the screw is reduced and the service life is prolonged.
With linear extrusion characteristics, it is convenient for upstream and downstream equipment to work in harmony. Since the leakage flow rate of the melt gear pump is small, the conveying capacity of the melt metering pump is basically linearly related to the rotational speed. After the rotational speed of the gear pump changes, the flow rate can be accurately known. Since the working speed of the upstream and downstream equipment and the gear pump can be determined, the gear pump The pressure, temperature and other information data collected at the inlet and outlet realize online monitoring and feedback control of the entire extrusion process.
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