Introducing a melt pump into a plastic extrusion production line is primarily aimed at significantly improving product quality and production stability. Its core working principle is akin to installing a "precision voltage stabilizer" for the melt delivery system, enabling active and precise control of the melt pressure and flow rate entering the die.
Extruders inherently have fluctuations, such as unstable screw speeds, inconsistent feeding, or changes in raw material viscosity, which often lead to output pressure pulsations. These pulsations can cause defects like inconsistent film thickness, deviations in pipe wall thickness, or dimensional fluctuations in sheets.
By utilizing precise gear meshing, the melt pump eliminates these upstream fluctuations, providing a highly stable and uniform melt flow to the downstream die. This not only directly reduces waste and substandard products caused by pressure instability but also ensures that products from batch production have highly consistent appearance dimensions and physical properties. It is a key technological guarantee for achieving high-quality precision extrusion.