I have a black wrinkle powder that has a rat holing problem in 18" square hopper, so I installed a air cylinder driving a H shaped shuttle across the bottom of the hopper. This shuttle has nozzles across the front and is 1" above the bottom to stir and sweep the hopper, and is tied into the booth backpulse timer and cycles every 6th backpulse.
Also on special applications Nordson uses a fan blade suspended on a shaft mounted on the top of the fluidizer driven with a air powered gearmotor to constantly stir the paint for this reason.
Gary
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