Discrete element modelling of ribbon milling: A comparison of approaches

Roller compaction followed by milling of the generated ribbons is a typical dry granulation route. It desirable to be able predict size distribution granules exiting mill based on ribbon properties and operational conditions. Two DEM-PBM approaches for predicting this are compared; direct approach where experimentally determined, an indirect successive change in due each stressing event determined mathematically PBM. The experimental component assumes shear deformation dominant breakage mechanism. This provides reasonable agreement data, though influence parameters not tested. When considering driven impact, predicts correct magnitude fines generation, incorrectly fine fraction increase with impeller speed. abrasion assumed mechanism, suggests same trend, less pronounced effect speed closer data. Prediction accuracy expected improve distributions conditions material strength, latter being explicitly captured approach. Furthermore, accounts variable loading fragments mill.