Deformation of Particles during Briquetting

Mechanistic Study of the Effect of Roller Compaction and Lubricant on Tablet Mechanical Strength

“…K y is considered a material-dependent constant inversely proportional to its yield strength, 22 Y (K y ¼ 1/3Y) and mean yield pressure, 23 P (K y ¼ 1/P). Two regions characterize a typical ''out-of-die'' Heckel plot: the initial curved region represents the initial repacking stage and the subsequent linear region represents subsequent plastic deformation.…”

Insensitivity of Compaction Properties of Brittle Granules to Size Enlargement by Roller Compaction

“…This explanation finds support from studies showing more extensive fragmentation of brittle particles than plastic particles especially at elevated compaction pressures. [6][7][8] The lower limit on the size of fragments is defined by a material-specific critical particle size where brittle-plastic transition occurs. When under pressure, a particle at or below the critical size undergoes plastic deformation rather than fracture.…”

A comparison between two powder compaction parameters of plasticity: The effective medium A parameter and the Heckel 1/K parameter

“…A second article was published (Mahmoodi et al, 2012) where the effective medium equation was transformed to be in terms of powder bed height with a variable end point of compression. In this second article we experimentally evaluated the EM equation with two materials of contrasting mechanical properties; plastically deforming sodium chloride (Hardman and Lilley, 1970;Hersey and Rees, 1971), and fragmenting lactose (Hersey and Rees, 1971). In the current article we present a new procedure for using the EM equation which is analogous to the way in which the Heckel equation is typically applied.…”