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Abstract
The problem of the bulk density attained by a mixture of two powders, of uniform particle size, is considered. It is shown that there are three limiting cases for which the bulk density may easily be calculated and that, from these cases, the bulk density corresponding to a wide range of conditions may be deduced.
It is suggested that a clear distinction must be maintained between a perfect ordered mix, designated a “hyperperfect” mix, and a perfect randomized mix, the randomized mix being the only type attainable by use of a practical mixing machine. The perfection of the mixing of the two component powders is an important factor in the problem and, for mixes as obtained from practical mixing machines, the bulk density is considerably lower than would be the case with the theoretically perfect randomized mix.
The assumption upon which most of the work on the density of mixtures is based, namely that of a “hyperperfect mix”, is inappropriate to industrial mixing processes, so that such treatments are invalid.
Notes
* Manuscript received 26 October, 1964.