System and operating variables factors affecting product size

System and operating variables factors affecting product size 

The effects of a number of parameters on the properties of fluid bed granulation products [19,22] are summarized below. These generalizations require experimental testing, however, for each spray granulation application. 

Increase in the rate of liquid feed addition and in its solids or binder content generally produces larger, stronger and more dense granules. There is, of course, an upper limit to the liquid feed rate set by increasing cohesion of bed particles and a tendency for the bed to slump or defluidize. 

In some cases, as the solids content of the feed increases, the feed may tend to spray dry in the space above the bed, forming new seed particles and smaller particle size in the bed. 

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