How to improve the dimensional accuracy of plastic extrusion process? Extruder outlet pressure by a variety of factors there is a big fluctuation, will certainly affect the dimensional accuracy of the product, if we are in the extruder outlet and the die plus a melt pump, you can use To stabilize the outlet pressure fluctuations in the extruder, making linear extrusion possible, thereby increasing the dimensional accuracy of plastic products, extruder output per unit time to improve. Melt pump is a positive displacement conveyor equipment, high-precision gear gap and volume structure design, so that a stable and balanced extrusion possible, in chemical fiber, granulation, plastic film, sheet, sheet, profiles, pipe, wire Cable, wire drawing, composite extrusion and other production lines have been widely used, and achieved good results: 1. To achieve a stable extrusion, extrusion products to improve dimensional accuracy, reduce scrap rate. In the extrusion process, the uneven feeding of materials, barrel and head temperature fluctuations, pulsating speed and other phenomena is difficult to avoid. The use of melt gear pump can eliminate feeding system feeding error, can greatly reduce the upstream process of transmission fluctuations, rapid access to stable working conditions, improve the dimensional accuracy of extruded products, reduce scrap rate. 2. To increase production, reduce energy consumption, low temperature extrusion, extend the life of the machine. Since the extruder is equipped with a polymer melt pump, the decompression function of the extruder is transferred to the gear pump, and the extruder can work under the condition of low pressure and low temperature, the leakage flow is greatly reduced, and the output is increased. Gear pumps create head pressure more effectively than extruders and reduce backpressure on the extruder, allowing the screw to withstand the axial forces and prolonging service life. 3. With linear extrusion characteristics, to facilitate the coordination of downstream equipment. As the gear pump leakage less, the pump capacity and speed of the basic linear relationship between the gear pump speed changes, the flow can know exactly, because it can determine the upstream and downstream equipment and gear pump synchronization work speed, the use of gear pump Entrance and exit of the collection of pressure, temperature and other information to achieve the entire extrusion process online monitoring and feedback control. The control system adopts Siemens PLC programmable control mode, with advanced man-machine interface, which can control pressure, temperature, flow and speed in an all-round way. The automatic and manual control functions are easy to switch and the control system can eliminate each Factors that cause pressure fluctuations in the extruder, the stability of the discharge port pressure, maximize the advantages of melt extrusion pump in precision.
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