Coating processes – Particles – flakes – or granules coated or encapsulated – Solid encapsulation process utilizing an emulsion or...
Patent
1986-04-21
1987-01-27
Beck, Shrive P.
Coating processes
Particles, flakes, or granules coated or encapsulated
Solid encapsulation process utilizing an emulsion or...
427212, 427242, 118 50, 118 58, 118 64, 118303, B05D 102
Patent
active
046393838
ABSTRACT:
A method and apparatus for coating particulate granules is disclosed. The method is practiced by providing a fluidized charge of granules suspended in a flow of a drying gas within a rotating perforated coating pan. A portion of the fluidized granules is drawn along the pan's surface to a position above the fluidized charge of granules and allowed to cascade back into the fluidized charge. Flow of the drying gas is concentrated in the vicinity of the granules movement, and a coating material is dispensed onto the moving granules. The apparatus disclosed comprises a rotating perforated pan having gas inlet and exhaust plenums in contact with the rotating pan's exterior. The inlet plenum introduces a stream of drying gas to fluidize and suspend the agitated granules; the outlet plenum exhausts the drying gas and thereby draws granules along the pan's inner surface to the outlet plenum's position. A means for rotating the pan is provided, as is a pump or vacuum source for drawing granules to the exhaust plenum's location. Means for dispensing coating material within the pan are provided. In an alternative embodiment, a purge system is disclosed that dislodges granules that have become attached to the pan's perforated surface.
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Beck Shrive P.
Thomas Engineering, Inc.
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