Wavin on board for new KM screw design

Pipe extrusion processor Wavin helped develop and field test a new range of 36D twin-screw, single-venting extruders for processing of PVC pipe, with those new machines now offered to the broader processing market by extruder manufacturer KraussMaffei Berstorff.

These are outfitted with what KraussMaffei (Munich, Germany) is calling its HPG (High Performance Geometry) screw concept, with which the entire 36 L/D length of the processing unit is used to optimize plasticizing and homogenizing of PVC. Atmospheric venting has been eliminated. Throughput is up to 10% higher than with double-venting extruders, according to KM. A longer metering zone means the machine can better build pressure and keep control of the melt temperature over the whole output zone. The longer mixing zone also improves dispersal of additives and blowing agents in the melt. —[email protected]