Plastic Extrusion Screw (Case Study)

• Three Zones of screw: Feeding, Compression & Metering.
• Wear occurs due to addition of non metallic fillers in plastic.
• Coatings of NiCrBSi with or without addition of tungsten carbide and tungsten carbide - cobalt protect against wear caused by abrasion & corrosion. Coatings are fused with base metal.
• Coatings are applied by TIG, PTA or HVOF using Robot or servo driven X-Y-Z Manipulator.