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Improving Flow from Hoppers Disclosure Number: IPCOM000054143D
Original Publication Date: 1980-Jan-01
Included in the Prior Art Database: 2005-Feb-13

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Ledford, JE Merkley, CD [+details]


The flow of particulate materials from cone-shaped and sloped-side hoppers under the force of gravity is often limited or impeded by friction between the contents and the hopper lining. Changing materials or ambient conditions can obviate the original design match between coefficient of friction and surface slope. To assist in the flow of toner from such a gravity feed hopper, a lance nozzle was designed to "fluidize" the hopper surface with a cushion of air or inert gas.