ARE PVD TYPE HARD METAL COATINGS SUITABLE FOR PLASTICIZING UNITS

The only known and established application for hard metal coatings in the plastics processing sector have increasingly been the cavities of injection moulds. For uses in plasticizing units, tribological studies into the interaction between the moulding material and the coated opp osite surface have so far been lacking. This necessarily mises the que stion about the extent to which PVD type hard metal coatings in plasti cizing units exert an influence on the friction in the solids zone, th e wall sliding behaviour in the melt area and the resistance of the me lt between the screw flight and the cylinder wall.