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In the extrusion process, uneven material feeding amount of fluctuation barrel and die temperature, screw speed of pulsation phenomenon is difficult to avoid. A melt gear pump feeding system can eliminate feed errors can be greatly reduced volatility upstream process passed quickly into the stable working conditions, improve the dimensional accuracy of the extruded product, reduce scrap outdoor deck color schemes rates. 2. increase production, reduce energy consumption and achieve low-temperature extrusion, extend the life of the machine. Since the installation of the extruder the polymer melt pump, the pressure reducing function is transferred to the extruder gear pump is completed, the extruder can operate at low pressure and temperature state, the leakage flow is greatly reduced, the yield is improved. Gear outdoor wood membrane pump more effectively build than the extruder head pressure, and reduce back-pressure extruder screw axial force to bear down and prolong life. 3. With the linear extrusion characteristics, easy on the downstream device coordination. Since the gear pump leak less flow, transmission capacity and speed of the pump substantially linear relationship, after the gear pump speed changes, the traffic can know exactly, due to be wood plastic decking cost determined, downstream equipment and gear pump operating speed synchronized by a gear pump inlet pressure at the outlet collected, temperature and other information, the entire extrusion process to achieve full-line monitoring and feedback control.