Die wall pressure is of fundamental importance in the tableting process, and accurate die wall pressure measurements are essential to understand compaction behaviour.
The transfer of axial to radial pressure gives a measure of friction within a powder and measurement of it can be used to define the minimum level of lubricant required.
Residual die wall pressure and the rate of relaxation of radial pressure can indicate the ejection stresses that will be experienced.
Radial pressure data is also valuable for entering material characteristics into mathematical models of formulations.
Pressures up to 350 MPa
Sensors: up to 3 sensors
Temperature: to 80 Deg C.
The graph shows die wall pressure at 3 points around the tablet at different heights, and the upper and lower punch loads during a single ended compaction. Ejection begins at 1.5s. Residual radial pressure is clearly shown, as is residual lower punch load Values for peak die wall pressure and peak residual die wall pressure are presented in tabular form.