Abstract
A method is described for monitoring wet massing or granulation in a planetary mixer, using a probe system. Movements or vibration of the probe during massing or granulation were monitored according to changes in displacement, velocity or acceleration using a vibration level monitor. It was found that gross changes occurring during massing and granulation could be monitored most sensitively using displacement or velocity measurements. Product sampled after different granulation times or after different volumes of granulating fluid were added was analyzed according to particle size and packing density as a method of assessing changes which could be related to specific regions of the vibration record. It was found that generally the granulation end-point corresponded with formation of a plateau region in vibration analysis; further mixing or addition of fluid caused a second increase in vibration signal as an over-wet mass was formed.
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