Method for preparing a feed screw for processing plastics
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United States of America Patent
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Mar 30, 1993
Grant Date -
N/A
app pub date -
Nov 14, 1991
filing date -
Nov 14, 1991
priority date (Note) -
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Abstract
Preparation of feed screw having a wear resistant alloy coating thereon for the injection molding or extrusion of plastic. Nickel-based alloys that have shown themselves to be compatible with inlaid barrel liners by virtue of similar wear ratios, modulus of elasticity, ultimate yield strength, and linear thermal coefficients of expansion, are sprayed at high velocity onto a heated feed screw to mechanically bond the alloy to the feed screw. The alloy is then fused to the feed screw in a controlled manner. Following the fusing process, the feed screw and alloy thereon is heated and allowed to cool in a highly controlled environment to produce a crack-free dense coating of the alloy on the screw substrate.
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