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The function, working principle, and characteristics of the melt conveying booster pump

The melt conveying booster pump is widely used in the extrusion molding of plastics, resins, rubber, and chemical fiber products. The following is a detailed introduction to its function, working principle, and characteristics:

The function of the melt conveying pump

The melt conveying booster pump is mainly used for the conveying, boosting, and metering of high-temperature and high viscosity polymer melts. In the extrusion molding process of plastic, resin, rubber, and synthetic fiber products, such as granulation, film, pipe, plate, sheet, artificial fiber, optical fiber, medical plastic tubing, etc., the melt conveying booster pump plays an important role. The main function is to pressurize and stabilize the high-temperature plastic melt from the extruder, and then steadily feed the flow rate into the extruder head. Its ability to stabilize melt pressure and flow rate is superior to various types of extruders.

polymer melt pump

Working principle of melt conveying pump

The melt conveying booster pump is a positive displacement conveying device, and the flow rate is strictly proportional to the pump speed. Mainly composed of pump casing, driving gear, driven gear, sliding bearings, front and rear end plates, packing seals, etc.

The feed area, feed area, and discharge area of the pump are composed of the tooth profile of two gears, the pump body, and the side cover plate. During work, the molten material is transported by the change in working volume caused by the meshing of the main and driven gears.

When the gear rotates in the specified direction, the melt enters the grooves of the two gears in the feeding area. As the gear rotates, the melt is brought into the feeding area from both sides. The re meshing of the gears causes the melt in the grooves to be squeezed out of the discharge area and pressed into the outlet pipeline. As long as the pump shaft rotates, the gear will press the melt towards the outlet side, so the pump outlet can reach a very high pressure, and there are no high requirements for the inlet flow rate and pressure, and even the inlet vacuum suction can be achieved.

extrusion melt pump

Characteristics of Melt Transport Pump

Stable flow: The gear of the melt conveying booster pump acts as a rotating barrier, effectively blocking the pressure fluctuations in the feed area and the impact of flow fluctuations on the discharge area. Even when the inlet pressure of the pump fluctuates within a large range due to various factors, the outlet pressure and flow fluctuations of the pump can be completely controlled within a very small range, achieving stable flow delivery.

High pressure: The melt conveying booster pump can generate high pressure to transport high viscosity melt to the desired location. This is very important for processes such as injection molding and extrusion molding.

Precision control: The melt conveying booster pump can achieve precise flow control by adjusting the pump speed, which is crucial for producing high-quality products.

High efficiency: The melt conveying booster pump can generate higher flow rate at lower speeds, thereby improving energy efficiency and production efficiency.


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