Film Coating Process in Pharmaceuticals (Step by Step)
The film coating process involves the deposition of a thin layer of film-forming polymer on a product substrate. The process can be carried out using conventional baking equipment, but today more sophisticated equipment is used to achieve efficient drying, a high degree of automation, and a coating time.
The coating formulation contains a polymer solubilized in a suitable solvent along with other additives such as plasticizers and pigments. This solution is sprayed onto a bed of rotating or fluidized tablets. The drying conditions cause the removal of the solvent, leaving a thin deposit of coating material around each core of the tablet.
There are a number of variables that need to be controlled in a process and we will understand how these variables are crucial to the film coating proc...