Troubleshooting to Fluidized bed operation

Problem, Cause and Remedy

PROBLEMCAUSEREMEDY
Dusting-powder blowing out of hopperAir pressure too highAdjust air regulator to lower pressure to fluid bed
Powder too fineToo much reclaim added to virgin powder.
Virgin powder pulverized too fine by manufacturer
No air-percolating through powder surfaceInsufficient air pressureCheck air supply, increase air regulator pressure.
Check air line size to equipment
Plugged membraneCheck membrane for plugged pores from dirty air supply
Obstructed membraneCheck bottom of bed for plastic, cardboard, or other large obstructions
Compacted powderManually loosen powder and fluidize well with clean,dry air
Rat holing-air blowing large jet holes through powder surfacePowder level too lowAdd powder until hopper is 2/3 full when fluidized
Packed or moist powderManually loosen powder and fluidize well with clean, dry air.
Check compressed air and booth air for high humidity
Obstructed membraneCheck bottom of bed for plastics, cardboard, or other large obstructions.
Plugged or broken membraneCheck membrane for plugged pores from dirty air supply, cracks, or holes.
Stratification-powder separating into layers of fine and coarse particlesPowder level too highRemove powder until 2/3 full when fluidized
Powder too fineToo much reclaim added to virgin powder.
Virgin powder pulverized too fine by manufacturer.