Fluid bed processor is widely used for coating of particle or granules. The enhanced surface area exposed to the processing environment makes the process more robust and results in uniformity in drying, binder distribution or coating. So, in the current scenario, fluid bed technology is most preferred technique when it comes to achieving content uniformity.
Tablet coating is done for various purposes:
Compressed tablets may be coated with coloured or uncoloured sugar layer. The coating is water soluble and quickly dissolves after swallowing. The sugar coating protects the enclosed drug from the environment and provides a barrier to objectionable taste or order. It also enhances the appearance of the compressed tablet and permits imprinting of manufacturer's or brand's information. Sugar coating provides a combination of insulation, taste masking, smoothing the tablet core, colouring and modified release.