Wet Granulation in a Small Scale High Shear Mixer

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Abstract
Wet granulation of lactose and corn starch in a 10 litre high shear mixer was examined. The effect of the amount of water added, granulation time and impeller speed on five properties of the granules was investigated by a response surface design. It was shown that moisture level as a major effect on geometric mean diameter and flow rate of the granules. The impeller speed markedly influences the geometric mean diameter, geometric standard deviation, compactability index and percentage of granules smaller than 1250 μm. Finally the granulation time has an evident influence on compactability index. Theoretical optimum conditions were obtained for the five response variables and are comparable with the experimental results.

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