World-leading plastics machinery specialist, Krauss Maffei Extrusion of Munich Germany is now offering an increased level of wear resistance for all parallel and conical twin screw extruders.
Krauss Maffei has introduced a plasma powder arc welding process (PTA) that coats the top-root edges of counter rotating screws to minimise the naturally occurring adhesive wear in counter rotating twin screw extruders, helping to increase the machine service times significantly, according to Dr Liebhold, Head of Extrusion Technology at Krauss Maffei.
He adds that software developed specially for this application permits continuous welding even with incline changes in the flights to be coated as well as welding of the runouts depending on the selected screw geometry.
The system is designed for machining processing screws with diameters ranging between 43mm and 184mm. With the addition of the optional tungsten-carbide reinforcement coating, the treatment can add between 12,000 and 20,000 operating hours to the machines compared to standard machines. Tungsten-carbide coatings are typically used for highly abrasive applications such as processing of natural fibre composites for decking profiles.
Krauss Maffei is represented in Oceania by HBM Packaging & Plastics Technologies