Crystallizers feed strategies

This strategy is adopted because of the sheer complexity of the process and the unavailability in the past of suitable sensors for on-line quality moisture content measurement. The quality of the product such as final moisture content, thickness, porosity, wetting, and rehydration capability (for pregelatinized starch) as well as the right crystal structure (the right therapeutic form for pharmaceuticals) are complex functions of drum speed, temperature, nip width, feed material, feed concentration, and feed-spreading technique. In addition, the final moisture content and thickness of the sheet may not be uniform across the width of the drum dryer that can lead to problems in shelf life and packaging of the product, respectively. 

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