Patent ID: 6786630
Filing Date: 2004-09-07
Classification: B29C,C23C,Y10T

Abstract:
A screw for a plastics processing machine, comprising:a screw body made of a base material, which is no longer useful as a consequence of wear, said screw body including a screw flight having a crest; a buffer layer made of magnetically conductive metallic material and applied onto the crest of the screw body by means of a thermal spraying process to compensate for a diameter reduction of the screw body as a consequence of wear and abrasion, wherein the buffer layer is made of chromium steel with a content of Cr of 10 to 16 wt. %; and a wear-reducing coating made of molybdenum or a molybdenum-containing alloy and applied onto the buffer layer by means of a thermal spraying process.