The core difference between a melt metering pump and a melt g
Melt metering pumps and melt gear pumps may appear similar, but they differ fundamentally in their definitions and functions. Melt metering pumps, with precise metering as their core, can be classified as such regardless of gear or screw structure, as long as they can achieve quantitative melt supply and control delivery flow errors. The core evaluation criterion is metering accuracy, which directly affects the uniformity of downstream products. On the other hand, melt gear pumps, with gear meshing structure as their core, rely on changes in the volume of a closed cavity to complete forced melt delivery and pressurization. They are typical positive displacement pumps that emphasize high temperature and high pressure resistance, structural stability, and delivery efficiency, making them common equipment in the polymer industry.
The two have distinct focuses in terms of function and structural design. The melt metering pump is optimized around metering accuracy, pursuing constant volume, reliable sealing, and controllable speed. It reduces backflow through precision machining to ensure stable displacement per revolution. Among them, the gear-type structure is the most widely used and has the highest accuracy. The melt gear pump is designed around adaptability to working conditions, using special wear-resistant and high-temperature resistant materials to adapt to high-temperature, high-pressure, and high-viscosity environments. Its core function is to stabilize delivery and eliminate pressure fluctuations. The general type focuses on delivery and pressure increase, while the precision type, through structural optimization, can also handle metering, achieving multi-purpose functionality.
In terms of applicable scenarios, selection should also be made according to needs. Melt metering pumps are predominantly used in scenarios demanding stringent precision, such as chemical fiber spinning and precision injection molding, relying on quantitative supply to ensure consistent product dimensions and thickness. Melt gear pumps have a broader range of applications. Besides precision production scenarios, they can also be used in polymer reactions, kettle bottom discharge, pipeline pressurization, rubber and hot melt adhesive extrusion, and other applications where stable delivery and pressurization are required.
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