| Tech Tip For Granulating: Fluidized Bed Granulators: The Bag Shaking During The Spray Cycle |
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The filter bag one sees in a fluidized bed granulator/drier plays a key roll in producing a uniform particle size distribution.
The frequency with which one shakes this bag as well as the duration of the shake helps keep the powder bed flowing in
a constant, random motion. Failure to shake the bag frequently may result in a large quantity of fine particle collecting in
the bag area. This eventually may lead to a total bag clog which in effect gives the granulator/drier a “heart attack”
which stops the flow of the powder resulting in a dead bed.
That’s right. During the spray cycle, while the particles are the wettest they are going to be, it is important to shake the
bag frequently. This should be something like 15-20 seconds every 2 minutes or so. You can see the bag as it begins to
clog up by simply monitoring the magnehelic gauge for the filter bag and shaking the bag once the gauge indicates a
significant pressure build up. Shaking frequently will bring the fines back down under the influence of the spray gun
where they can continue to grow as granules.
| Solid Dosage Training, Inc. FREE TECHNICAL HELP Granulating |
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