The profitability of injection moulding of plastics with a high filler rate, of oxide ceramics, permanent magnets and cemented carbides is impaired by the wear of the screws, cylinders and locking rings.

We have solved this problem by lining the cylinders with cemented carbide sleeves, by brazing cemented carbide on the screw tips and by making the screws, the blocking rings and locking rings entirely of cemented carbide.

By using the adequate grades and by relying on a cemented carbide-adapted construction of the extrusion sets we have achieved a nearly fifty-fold extension of the tool life compared with conventional steel tools.