“Tumbling” is a widely-used way of dry powder blending in the oral solid dosage (OSD) manufacturing environment. In his article, Wim Spook of Matcon demonstrates how IBC blenders, when compared with other methods of dry powder blending, can significantly increase your blending capacity and reduce your manufacturing costs.
http://ipimediaworld.com/wp-content/uploads/2014/07/How-to-eliminate.pdf