Below is a list of Inclined Screw Conveyors manufacturers from St. Louis, Missouri. Inclined screw conveyors are spiral bulk material transportation systems that convey raw ingredients to and from processing areas that are on different levels of a facility. These conveyors are slanted at different angles to economically elevate and convey materials up and down floors. They require ample space and an increased amount of power to lift the material, depending on the steepness of the angle.