In industrial extrusion production, a melt pump is a core precision processing device professionally installed between the extruder and the molding die. It serves as a critical unit to stabilize melt delivery, eliminate pressure fluctuations, and enhance the dimensional accuracy of final plastic products. Unlike ordinary auxiliary pumping equipment, it is not a simple additional component for pressure boosting. Instead, it achieves functional separation of the extrusion system, dividing the screw extruder’s plasticizing melting function and the die-front pressure stabilization and metering function independently.
As a positive displacement gear pump, it relies on precisely meshing high-precision gears inside a temperature-sealed pump housing. With stable gear rotation, it captures fixed volumes of molten polymer in gear tooth grooves, conveying the melt uniformly from the inlet to the outlet. This mechanical structure insulates the unstable pressure and flow pulsations generated by extruder screw rotation and material feeding deviations. It delivers continuous, steady-pressure, and fixed-quantity melt to the molding die, fundamentally solving the common production problems of uneven melt supply and fluctuating mold pressure.
This functional optimization brings remarkable improvements to extrusion product quality and production stability. By standardizing melt flow and pressure, the melt pump effectively controls the thickness tolerance and dimensional deviation of finished products. It is widely applied in the production of plastic sheets, plates, pipes, films, profiles, and other polymer products. Additionally, it reduces material waste, lowers equipment operating load, and improves the overall consistency and yield of continuous extrusion production, making it an indispensable precision device for high-standard plastic extrusion processing.
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