Spray drying and size enlargement

Spray dried products, in general, are expected to meet a number of requirements. Properties of interest include size and size distributions, bulk density, moisture content, friability, appearance, reactivity and, with food products, aroma and flavour. Control of these properties requires close attention to all four unit processes described in Section 1.1. 

From the point of view of size enlargement, the property of most interest is, of course, particle size and its distribution. Some of the variables which can be used to increase the size of spray dried products can be summarized  

In addition, the selection and design of the atomizer system is of great importance to product properties. In fact, all the variables noted above interact so that changes in product diameter can be expected to be accompanied by changes in other properties as well. Small-scale experimental tests must generally precede final design. 

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