How does the melt pump work?

The melt pump belongs to a positive displacement pump, which relies on the change in working volume caused by the meshing of the main and driven shafts to transport the melt during operation. The working volume is composed of the pump body, gear teeth, and bearings with side plate function. When the gears rotate, the melt enters the grooves of the two gears in the suction chamber. As the gears rotate, the melt is brought into the discharge chamber from both sides. The re meshing of the gears causes the melt in the grooves to be squeezed out of the discharge chamber and sent to the outlet pipeline. As long as the pump shaft rotates, the gear presses the melt towards the outlet side, so the pump outlet can reach a high pressure, and the flow rate is basically independent of the discharge pressure.

The application of melt pumps in production lines such as chemical fibers, granulation, plastic films, sheets, plates, profiles, pipes, wires and cables, drawing, composite extrusion, etc. almost covers most polymer materials that can be processed, such as PE, PC, PP, PVC, HIPS, PS, PA, TPUR, fluorinated polymers, polysulfone, polyester, thermoplastic elastomers, rubber, and thermal adhesives, and in PBAT, PBST, PLA, PLC PPC and other biodegradable materials have also been applied.

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