Method for coating particles or liquid droplets

Plastic and nonmetallic article shaping or treating: processes – Encapsulating normally liquid material – Liquid encapsulation utilizing an emulsion or dispersion to...

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264 44, 264 46, 264 47, 425 5, 42721333, 42721336, 427240, 427345, 424450, 424492, B01J 1302

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046751408

ABSTRACT:
Solid particles or viscous liquid droplets of core material are encapsulated in a coating material largely as single particles with a single coherent coating, by feeding a suspension of the two materials onto a rotating surface. The suspension is centrifugally dispersed by the rotating surface into relatively large coated particles and relatively small droplets of coating material. Only the size of the droplets of unused coating corresponds to the droplets formed from atomization of the liquid coating material. The size of the coated particles depends on the size of the uncoated particles and is much less dependent upon the atomization characteristics of the rotating surface. Upon being thrown from the rotating surface, or falling from that surface, the droplets and coated particles are solidified by exposure to air and are separated by sieving, or the like. The solidified droplets of pure coating material may be recycled into the suspension. Coating of all particles is achieved by dispersing the individual components of core material in the coating material before the resulting suspension reaches the rotating surface.

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Kirk-Othmer Encyclopedia of Chemical Technology, Third ed., vol. 15, pp. 470-493 (1981).
"Spray Drying Handbook" by K. Masters, 3rd ed., John Wiley & Sons New York, pp. 179-184 (1979).

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