An evaluation of six techniques for measuring porosity of ribbons produced by roller compaction

Oct. 28, 2024, 1:41 p.m. - by Yiwang Guo , Lizbeth Martinez , Arnesh Palanisamy , Bindhu Gururajan , Changquan Calvin Sun

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Ribbon porosity is essential to monitor in roller compaction. This study compares six porosity measurement methods—caliper, X-ray microtomography (µCT), near-infrared spectroscopy (NIR), laser triangulation, mercury intrusion porosimetry (MIP), and GeoPyc—using MCC ribblets compacted at 8–130 MPa. Each method offers unique benefits: Caliper works for simple shapes; GeoPyc’s accuracy depends on sample characteristics; µCT and MIP excel at low and high porosities, respectively; Laser offers high reproducibility; and NIR provides rapid results ideal for in-line monitoring, despite sensitivity to sample presentation. Findings support method selection for optimized roller compaction.

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