PERFORMANCE IMPROVEMENTS

Fundamental studies of screws of parallel and conical twin screw extru ders indicate a considerable developmental potential in the extrusion of PVC. New processing concepts can be applied which will result in an increased throughput in the extrusion of several different formulatio ns without the need of a screw change. It is predicted that by the yea r 2000 the throughput levels per extruder size will be double of those typical only in 1994.