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The Differences Between Melt Pumps, Melt Gear Pumps, and Gear Pumps

In the extrusion production of polymer materials such as plastics and rubber, screen changers have evolved from “optional accessories” to “core essentials.” Their irreplaceable nature stems from their systematic resolution of three major pain points in the industry.

I. Analysis of the Relationship Among the Three

Gear Pump‌: A general term referring to all positive displacement pumps that rely on gear meshing to achieve volumetric changes for fluid delivery. They are widely used in hydraulic systems, oil transportation, and other fields.

‌Melt Pump‌: An abbreviation for “melt gear pump,” it is a specific subtype of gear pump, specifically referring to specialized equipment used for conveying high-temperature, high-viscosity melts in polymer material processing.

‌Melt Gear Pump‌: The full name clearly indicates that its structure is gear-type, with a specialized function primarily used for pressurization, pressure stabilization, and precise metering in extrusion molding production lines.

Therefore, it can be stated that:‌Melt Pump = Melt Gear Pump ⊂ Gear Pump

II. Differences in Function and Application

The core mission of a melt gear pump is to address the challenges of stable delivery, pressurization, and precise metering of high-viscosity melts under high-temperature and high-pressure conditions. It is an indispensable piece of equipment in continuous production lines such as plastic extrusion and chemical fiber spinning.

‌Conventional gear pumps, on the other hand, emphasize “versatility, cost-effectiveness, and convenience.” They are suitable for standard industrial applications with modest requirements for temperature, pressure, and precision, but lack the capability to handle complex polymer processing conditions.

Simply put:

If you are handling the conveyance of molten PET, PA, PP, PC, rubber, or biodegradable materials, you must use a melt gear pump; If you are simply conveying lubricating oil or diesel at room temperature, a standard gear pump will suffice.

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