Both ambient and process variables are involved in fluidized bed coating (Fig. 4). The rate of evaporation of the coating media significantly affects film formation. Fluidization air velocity, temperature, and humidity are the three components of this variable. The recommended spray rate is dependent on three factors: the evaporation capacity of air; the tackiness (stickiness) of the coating being applied; and the speed with which the particles travel through the coating zone [20]. Shaking of the filter housing at the top of the reactor is essential for re-introducing the smaller particles into the reactor