Abstract
Abstract A new technique is described for the observation of the stresses acting during a compaction operation. Pharmaceutical materials have been compressed in a Perspex die and viewed by polarised light. By using ancillary Perspex strain gauges both radial pressure and shear stress at the die wall may be determined from the interference pattern. Although Perspex is not a strong material, pressures up to about 12 tons/in2 could be contained, and a hard tablet extracted from the die. The entire pressing operation is recorded on ciné film for later analysis.
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