Mechanical Conveying Q&A
Answered May 9th, 2011 by Expert:
Shaftless screw conveyors are the perfect solution and designed to efficiently convey semi-fluid and sticky bulk materials. Wet and sticky bulk materials will adhere to the center pipe of a conventional shafted screw conveyor and reduce the conveying capacity. The shaftless screw design is non-clogging because of the absence of a center pipe, which also eliminates the need for intermediate hanger bearings. The shaftless spiral provides the conveying surface and is directly connected to the drive unit.
The shaftless screw conveyor can solve many other application problems. They can be designed completely gas-tight to eliminate the escape of any harmful vapors. Also, material with large lumps can be easily conveyed and reduced in size by the spiral action of a shaftless screw conveyor.
Typical construction includes high-strength spirals, stainless steel housings with reduced-friction liners, and high-torque drive units. Shaftless screw conveyors are used in many industries such as chemical, food processing, pulp and paper, and wastewater treatment.