EXAMINATION OF STARVE-FED SINGLE SCREW EXTRUSION IN CONVENTIONAL AND BARRIER FEED SCREWS

摘要

An investigation of starved-fed single screw extrusion was initiated to study its improved mixing capabilities for the compounding of filler. Experiments were carried out in a 63.5 mm single screw extruder, examining the effect of degree of starvation on a conventional and barrier feed screw. Interest was focused on the mixing/melting mechanism of starved-fed solids-conveying as it affects the size and number of filler agglomerates observed in the extrudate. Both screws showed improved mixing quality with increased starvation. Trends in pressure, torque and power efficiency reflected the improvement in mixing.