Picking and Sticking
Tablets momentarily stick together, often just after they pass through the spray zone, and then break apart leaving defects in the surface of the coating where pieces of coating have been removed.
|Tablet Core||Tablet surface curvature is not sufficient to prevent tablets sticking together.||
|Coating Formulation||Coating formulation has a low glass transition temperature (Tg), causing it to become tacky under normal processing conditions.||
|Coating Process||Coating becomes tacky because of overwetting during application of the coating.||
|Coating becomes tacky because of low Tg of coating formulation.||