Experiment and simulation of the dry particle coating

Akira Sato (1, 2, 3) , Eric Serris (1, 3, 4) , Philippe Grosseau (1, 2, 3) , Gérard Thomas (1, 2, 3) , Alain Chamayou (5) , Laurence Galet (5) , Michel Baron (5)

1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
2 P2MC-ENSMSE - Département Poudres et Matériaux Multi-Composants
3 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires
4 PRESSIC-ENSMSE - Procédés et REactivité des Systèmes Solide-gaz, Instrumentation et Capteurs
5 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement

The objective of this study is to get a better understanding of dry powder coating process using experiments and numerical method. Materials chosen as host particles are SUGLETS® (spherical granules mainly consisting of sugar) and as invited particles, magnesium stearate (MgSt). These two materials are introduced in the Cyclomix high shear mixer. Operations were performed at various mixing time and rotation speed of the Cyclomix. The surface morphology analysis has confirmed that Suglet particles are coated by MgSt. The product properties such as flowability, wettability and particle size distributions were also characterized. The particle motion in the Cyclomix has been simulated by using Discrete Element Method (DEM). Both number of collisions and the collision force frequency are calculated. The simulation shows an increase of the collision number with the rotational speeds. This result indicates that the higher rotation speed should be better for the dry coating process as long as the particles aren't broken down.

Mots clés: Dry particle coating; Discrete Element Method; Cyclomix

Domaines: Génie des procédés

Akira Sato, Eric Serris, Philippe Grosseau, Gérard Thomas, Alain Chamayou, et al.. Experiment and simulation of the dry particle coating. 5th International Workshop on Granulation. Granulation Conference Lausanne, Zwitzerland,, Jun 2011, Lausanne, Switzerland. pp.99. ⟨hal-00616515⟩