All plastics processing feedscrews suffer from adhesive wear.

In fact, 95% of all plasticating feedscrews are repaired or replaced due to adhesive wear of the flight outside diameter.  Incidental contact between the rotating screw and the stationary barrel results in eventual reduction in diameter of the screw.  This leads to longer plasticating times (Inj Mold) or reduced throughput (Ext) and overall lower productivity of a screw/barrel system.  Bi-metallic feedscrews are an attempt to counter this adhesive wear by weld application of a better wearing alloy material on the top of screw flights.  Our XC1000 tungsten carbide has proven to offer as much as ten times more adhesive wear resistance than standard alloys in real world applications.  An example – 4-1/2″ 24:1 extrusion feedscrew wearing .020″ (.5 mm overall) in 13 months.  A layer of .020″ (.5 mm overall) of XC1000 on the screw flight had only .005″ (.125 mm overall) of wear after 14 months of operation.  This is a ten-fold improvement compared to the previous alloy

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