World-leading plastics processing machinery specialist Krauss Maffei Extrusion of Munich, Germany recently installed four direct extrusion lines for two leading European manufacturers to meet the increasing demand for Wood Plastic Composites (WPC) in the market.
German company Pinuform has installed three WPC twin screw extruders and a twin screw compounding extruder to carry out direct extrusion. The company recycles wood chips from their timber mill to produce WPC decking profiles.
Leading French manufacturer of WPC decking profiles, Oceplast has installed a direct extrusion line that consists of a KMD 75-32/WPC twin-screw extruder, a calibration table, haul-off/saw combination and a tilting table designed specifically for the customer’s requirements. The extremely compact line has been designed for the processing of extra wide profiles and has a maximum output of 200kg/hr.
The Krauss Maffei solution was chosen as their twin screw extruders have a high wear resistance rate required for the very abrasive properties of WPC compounds. The screws have tungsten carbide armour plating while barrels are lined with a bi-metallic bushing.
Direct extrusion allows products to be made in a single-step process by direct metering of the two components – wood and PVC. A two-component gravimetric system transports wood flour and PVC dryblend into a dynamic mixer, which feeds the perfectly homogenised material mixture directly into the extruder.
Krauss Maffei’s solution eliminates the need for the typical complex compounding process using a heating-cooling mixer, saving production space and energy as the wood flour is already pre-dried.
Krauss Maffei is represented in Oceania by HBM Packaging & Plastics Technologies .