This extrusion customer produces friction material for use in automatic braking assemblies for consumer products such as washing machines and lawn mowers. This is basic profile extrusion of a proprietary heavily filled mineral/fiber material. The equipment is a Bonnot extruder with a 4” interrupted-flight screw designed to process high load materials.
Standard protection for the feed screw has been complete weld encapsulation of Colmonoy 56, nickel-based hard facing. Typical batch size is about 360 lbs. and after 150 batches (3 to 4 months production) the C56 protection has severe erosion. Flight outside diameter is also reduced and output rate becomes uneconomical and the screw is removed and rebuilt.