The flow behaviour of four pharmaceutical powders was investigated using a model shoe-die-filling system. The variation of mass delivered to the die as a function of shoe velocity provides a measure of flowability. The paper discusses the concept of critical velocity, above which incomplete filling is observed, in the context of pharmaceutical powders. The filling process was recorded using a high-speed video system, which allowed the different flow patterns to be observed, and how this influ...Expand abstract
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Measurement of the flow properties of powders with special reference to die fill.
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