A microprocessor-controlled gear pump for the melt raises the output and improves overall quality in the extrusion of profiles or tubes of very low dimensional tolerance. The melt pump also compensates for any extruder-related problems such as output fluctuations and incorrect pressure/temperature ratios.

The basic principle is that the melt pump breaks down the extruder output into smaller, volumetrically controlled individual flows and conveys them at a very accurate rate.

With respect to throughput, it is necessary to adjust the size and speed of the melt pump in such a way that as little friction heat enters the material as possible.