plastic pelletizing process melt pump
The plastic pelletizing melt pump is a critical piece of equipment used in the plastic processing industry to precisely control the flow rate and pressure of molten plastic. Primarily employed for conveying, pressurizing, and metering high-temperature, high-viscosity polymer melts, it is typically installed between the extruder outlet and the die head. This pump pressurizes and stabilizes the flow of high-temperature plastic melt from the extruder, delivering it steadily to the die head. This ensures the melt enters the mold at consistent pressure and flow rates, thereby enhancing pelletization quality and stability.
A plastic pelletizing melt pump is a positive displacement conveying device, primarily composed of a pump body, drive gear, driven gear, and sliding bearings. When the gears rotate in the specified direction, the melt enters the feed zone between the gear teeth. As the gears turn, the melt is drawn into the conveying zone from both sides. The subsequent meshing of the gears forces the melt from the gear teeth into the discharge zone, where it is pressurized and delivered to the outlet pipe. The flow rate is strictly proportional to the pump's rotational speed.
Features and Advantages
Stable Output: Effectively reduces material output instability and pressure pulsation caused by extruder parameters, keeping outlet pressure and flow fluctuations within a minimal range.
Enhanced Product Quality: Minimizes dimensional tolerances of extruded products, reduces scrap and defect rates, and ensures uniform particle size and consistent quality of produced plastic pellets.
Increased Output: Transfers the pressure reduction function from the extruder to the unit itself, lowering screw pressure requirements. This enables high-speed, efficient screw extrusion while reducing melt residence time in the barrel, boosting product output.
Reduced Energy Consumption: Lowers extruder back pressure and reduces axial forces on the screw, thereby decreasing energy consumption.
Extended Equipment Lifespan: Reduced pressure within the extruder barrel minimizes wear between the screw and barrel, along with load on the gearbox thrust bearings, prolonging equipment service life.
Enhanced Monitoring and Control: Features linear extrusion characteristics for seamless coordination with upstream/downstream equipment. Precise control of melt output flow is achievable by adjusting rotational speed, enabling full online monitoring and feedback control throughout the entire extrusion process.
Beyond extensive application in plastic pelletizing, it is widely used in polymer extrusion molding for films, pipes, sheets, and plates. It can also be installed in pipelines for conveying high-viscosity pure materials.
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