Screw Conveyors are divided in two categories: Transport Screws and Dosing Screws.
Transport Screw The transport screw are used for transporting material from one place to another. The screw is distinguish for low filling grade and fairly high speed.
Dosing Screw The dosing screw are used for even and accurate dosing of material for example refining machines, processes and heating plants. The difference between transport screw and dosing screw is that the dosing screw always work with filled screwthread at entrance.
The transport screw usage area is large. It can be used for handling: coal, coal powder, air ash, sand, REA plaster, dewatered sludge, wood fuel, bark, chips and sawdust.