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Fluid Bed Coatings


An alternative approach to pan coatings that provides the mixing and drying characteristics required by the film coating process is to use fluid bed technology. Fluid bed technology helps in achieving fast and uniform coating using air to mix, coat and dry the substrate at the same time. This technology originated from fluid bed dryers used for wet powder material drying operation. Fluid bed equipment was modified to coat tablets as an alternative innovation. However, this modification did not become popular for film coating tablets. The major concern during tablet coating using fluid bed equipment was high friability and compromise in core tablet appearance due to physical stress imparted during the fluidization process, compared to the much gentler pan coating process.


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