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Thermal Spray Process Surface Coating Spray Treatment on Screw Conveyor / Auger. Helical **flights** welded to a central shaft; material moves by screw rotation. Self-cleaning, compact, enclosed conveying with low dust spillage. Simple structure, easy to install, low maintenance cost. Surface subject to severe **abrasive wear** and **corrosion**. Available in single-screw, twin-screw, or feeder versions.