As one of its steps to help its customers reduce their power consumption, plastics processing machinery manufacturer KraussMaffei Berstorff now offers its range of 36D single-screw extruders with three-phase AC motors instead of DC motors.. Why? Well, the main areas of heat loss in an extruder are the barrel of the plasticizing unit and the drive train - the gearbox and a conventional DC motor. The efficiency of AC-driven extruders is between 5-12% higher than the equivalent DC versions, depending on the operating point, reports the manufacturer. The AC motors also show substantially better behavior under part-load than the DC drives. KraussMaffei Berstorff also offers the water-cooled AC drives as an option for production under cleanroom conditions. KraussMaffei Berstorff, Hannover, Germany; +49 511-57020; www.kraussmaffei.de.