SCREW FOR MACHINES FOR PROCESSING PLASTIC

摘要

A screw for plastic-processing machines consists of the base material of a screw that can no longer be used due to wear, and a wear-reducing coating consisting of molybdenum or an alloy containing molybdenum which is applied to the crest track of the screw flight and regenerates said screw. A single or multiple layer buffer layer consisting of a magnetically conductive metallic material is provided between the base material and the coating. This provide s a simple means of ensuring that the regenerated screw has a long service lif e and is resistant to heavy loads. Said buffer layer is applied to the base material and the wear-reducing coating is applied to the buffer layer by mea ns of a thermal spraying method, respectively.