The outlet pressure of the extruder fluctuates greatly influenced by various factors, which will affect the dimensional accuracy of the product. If we add a melt pump between the outlet of the extruder and the die, it can be used to stabilize the fluctuation of the outlet pressure of the extruder, make the linear extrusion possible, and thus improve the size of plastic products. Accuracy, increase the output of extruder in unit time. Bate melt pump is a kind of positive displacement conveying equipment. The design of high precision gear clearance and volume structure makes it possible for stable and balanced extrusion. It is widely used in chemical fiber, granulation, plastic film, sheet, sheet, profile, pipe, wire and cable, wire drawing, composite extrusion and other production lines.
1., it can achieve stable extrusion, improve the dimensional accuracy of extruded products, and reduce the reject rate. In the process of extrusion, it is difficult to avoid such phenomena as uneven material loading, fluctuation of barrel and head temperature, and pulsation of screw speed. The use of melt gear pump can eliminate the feeding error of the feeding system, greatly reduce the upstream process transfer fluctuation, quickly enter a stable working state, improve the dimensional accuracy of extruded products, reduce scrap rate.
2., it has the characteristics of linear extrusion, facilitating the coordination of upstream and downstream equipment. Because the leakage flow rate of the gear pump is less, the transmission capacity of the pump is basically linear with the rotational speed. When the rotational speed of the gear pump is changed, the flow rate can be accurately known. Because the synchronous working speed of the upper and lower equipment and the gear pump can be determined, the pressure and temperature information collected at the inlet and outlet of the gear pump can be used to realize the whole. The whole process of extrusion is monitored and feedback on-line.
3. increase production, reduce energy consumption, achieve low temperature extrusion and prolong machine life. Because the extruder is equipped with polymer melt pump, the pressure reducing function of the extruder is transferred to the gear pump. The extruder can work at low pressure and low temperature. The leakage flow is greatly reduced and the output is increased. Gear pump is easier and more effective than the extruder to establish the head pressure, 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.