Freund

Bottom Spray Wurster technology is commonly used as a method for applying functional coatings to multi-particulate substrates. Typically, antitack agents are added to dilute solutions or suspensions of polymer to reduce blocking during the drying of the polymer coat. Having to add antitack agents to the solution can create sedimentation and plugging in the solution lines. This study focuses on the scaling ability of a modified Wurster gun process to efficiently coat multi-particulate cores utilizing a polymer solution without anti-tack agents in solution, but with the anti-tack agents added via dry powder application through the modified Wurster spray gun.