Atomization of the coating solution provides an ideal solution to the problem of
introducing the solution to the bed. It solves the problem of local wet quenching
which may be a result of excessive wetting of particles by large coating droplets
(Nienow and Rowe, 1985). In the coating of fine particles, where the problem of
agglomeration is acute, Tsutsumi et al (1995) propose the use of supercritical fluid
solution. Hüttlin (1997) have developed a three-component spray nozzle to create a
stabilizing microclimate around the spray.