Below is a list of Worm Conveyors manufacturers from Cedar Rapids, Iowa. Worm conveyors, which are also known as screw conveyors, are composed of a rotating, spiral screw inside tubular casing or a trough. As the screw rotates, bulk material is pushed forward through the conveyor from one area to another. They handle all kinds of different materials, including powder, sludge, dust, flakes, granules and other loose substances like seeds, food waste, wood chips, cereal, grain, boiler ash, fuels, feed and cement.