The effect of particle shape on the variation of fill of a tabletting die

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Abstract
A 12 mm die cavity has been repeatedly filled from batches of granular material of a range of particle shape and size distributions. The variance in the weight contained by the die was determined from the replicates. The variance, expressed as a coefficient of variation to allow for differences in the means of groups of replicates, increased from 0·2635 to 0·7222 as the particle shape, expressed as the Heywood shape coefficient, increased in irregularity from a value of 8 to 13. The mean contained weight was greater for regular than for irregular particles, and a maximum die fill occurred where the ratio of die diameter to particle diameter was about 20 for all particle shapes.

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