KraussMaffei Berstorff presents new vacuum degassing system for granular or powdered fillers
On the occasion of Fakuma 2011 in Friedrichshafen (18th to 22nd October 2011), KraussMaffei Berstorff will showcase a new vacuum degassing system for the ZSFE twin-screw side feeder. This side feeder is used in combination with twin-screw extruders of the ZE UTX and ZE UT series. “This system sets new standards in terms of compounding productivity and cost effectiveness. Depending on the apparent density of the filling agent, the output can be almost tripled as compared to side feeders without degassing system. The optimum field of application for this system is the compounding of compounds filled with talc, wood flour, light-weight chalk types or other high-volume additives”, explains Gerhard Scheel, head of development at KraussMaffei Berstorff in Hannover. With fillers of low apparent density, the hollow spaces between the particles are filled with air. This air volume is not required for compounding and limits the output rate of the side feeder. The vacuum degassing system removes the air before the fillers reach the processing chamber of the extruder and reduces the volume, thus increasing the apparent density. Consequently, the degassing system allows the filler share used in the process to be increased.