Install a gear pump on the extrusion line, pass the accurate pressure measurement before the pump, adjust the speed of the extruder through PLC, keep the pressure stable and orderly to optimize the feeding process, widely used in such as PC, PMMA, ABS, The metering and pressurization of PET, PVB, PS, PP, PE and other high and low viscosity materials, the shell is made of high quality alloy steel, the gear is used for hardened steel or other high quality metal materials, with high efficiency and leakage prevention.