Melt gear pumps are core positive-displacement conveying equipment in the rubber, plastics, chemical fiber, and polymer materials processing industries. Their primary functions include maintaining stable melt pressure, delivering precise volumes, and accurately increasing pressure. They effectively address industry challenges such as unstable extrusion pressure, uneven material output, and significant variations in product thickness, making them essential auxiliary equipment for high-end extrusion production lines.
Their operating principle relies on the rotation of a pair of intermeshing precision drive and driven gears to convey material. When high-temperature molten material enters the pump chamber, it is separated by the gear teeth to form sealed chambers. As the gears rotate, the material is smoothly conveyed from the inlet side to the outlet side, with pressure increased through the squeezing action of the meshing gears. The equipment achieves constant volumetric output through precise clearance control, remaining unaffected by minor fluctuations in upstream feed pressure or material viscosity. It delivers precise and controllable flow rates with outstanding pressure stabilization performance.
The melt gear pump is constructed entirely from monolithic alloy steel, treated with carburizing and nitriding for wear resistance. It withstands high temperatures, high pressures, and offers excellent resistance to wear and corrosion. Combined with a circulating heating system and a high-efficiency sealing structure, it is well-suited for long-term operation in high-temperature, high-viscosity melt production environments, ensuring stable performance and a long service life.
In practical industrial applications, melt gear pumps have a very wide range of applications. In the plastic extrusion industry, they can be paired with pelletizers, cast film machines, and pipe and profile extruders to stabilize discharge flow rates and improve product precision and yield rates; in the chemical fiber spinning sector, they are used for the precise delivery of spinning melt to ensure uniform yarn thickness; they are also suitable for production lines of biodegradable materials, rubber products, and hot melt adhesives. Additionally, depending on operating conditions, they are available in multiple models, including standard delivery, high-pressure boosting, bottom-of-reactor discharge, and pipeline boosting types, to meet various process pressure, flow rate, and installation requirements.
The installation of a melt gear pump not only significantly reduces wear on the main machine’s screw and minimizes raw material loss but also simplifies the production process, improving the operational efficiency and product quality of the entire production line. It has now become a key industrial fluid transfer device for replacing traditional direct-feed extrusion and achieving precision mass production.
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WhatsApp： +86 158 38331071
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