To minimize the stickiness problem, both
process-based and material science-based
approaches are used. Process-based approaches
include the mechanical scraping of the chamber
wall, introduction of cold air at the bottom and the
use of low temperature / low humidity air. An
example of the material science based approach
involves the addition of drying aids such as corn
starch, gum Arabic and maltodextrin to reduce the
stickiness of the powders (Downton et al., 1982;
Werner et al., 2007).