China Shaftless Screw Conveyor Product Description The tubular shaftless screw conveyor, also known as a shaftless spiral conveyor, is a type of material handling equipment that is used to transport bulk materials , materials that are easy to be wound and blocked, and materials with special sanitary requirements. China Shaftless Screw Conveyor website:http://www.kunweimachine.com/screw-conveyor/shaftless-screw-conveyor/