Spiral Conveyor: 1.Large transportation capacity 2.ISO certificate 3.Whole life service 4.Competitive Price Screw /spiral Conveyor 1. Screw conveyor application: The machine is most suitable for transporting all kinds of powder, Granular materials, lumpish materials, such as coal, sand, lump coal, cement, cereal and so on. Perishable, viscous, and easy caking materials are not available to ...