In the second example, a mathematical model of a Wurster bed coater, Figure 1.4, has been developed (Karlsson, S., Rasmuson, A., van Wachen, B., and Niklasson Bjorn, I., AIChE J. 55, 2578–2590, 2009; Karlsson, S., Rasmusson, A., Niklasson Bjorn, I., and Schantz, S., Powder Tech. 207, 245–256, 2011) and validated against experimental results. Coating is a common process step in the chemical, agricultural, pharmaceutical, and food industries. Coating of solid particles is used for the sustained release of active components, for protection of the core from external conditions, for masking taste or odours, and for easier powder handling. For example, several applications in particular are used for coating in the pharmaceutical industry, for both aesthetic and functional purposes.

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