In Twin-Screw Compounding, Distinguish Between 'Disease' and 'Illness'

摘要

Feeders may be blamed for many compounding problems, but not normally for lot-to-lot variation. The inherent short-term variability of gravimetric feeding equipment will not change over time (unlike the extruder, which wears over time). While it may be possible for the incorrect screw to be installed in the compounding extruder, an incorrect screw in the feeder may force the gravimetric system to run at a higher (or lower) speed to maintain mass-flow setpoint.