Tablet coating means covering tablets with one or more than one layers of materials like natural or synthetic resins ,gums ,inactive and insoluble filler, sugar, plasticizer, polyhydric alcohol, waxes, authorized coloring material and some times flavoring material. There are various types of tablet coating techniques which are described below :
Sugar Coating
Sugar coating involves coating tablets with colored or uncolored sugar layer. This coating is soluble in water and dissolves completely when swallowed. Apart from improving the appearance of the tablet, sugar coating makes it easy to imprint manufacturing information on tablet. It increases the size and weight of the tablet. Sugar coating is a five stage process involving following steps:
Sugar Coating
Sugar coating involves coating tablets with colored or uncolored sugar layer. This coating is soluble in water and dissolves completely when swallowed. Apart from improving the appearance of the tablet, sugar coating makes it easy to imprint manufacturing information on tablet. It increases the size and weight of the tablet. Sugar coating is a five stage process involving following steps:
- Sealing/water proofing
- Sub coating
- Grossing/smoothing
- Coloring
- Polishing
Film Coating
In film coating, a thin layer of polymer is applied on the tablet core. Film coating involves the use of film formers namely Hydroxy Propyl Methyl Cellulose (HPMC),Methyl Hydroxy Ethyl Cellulose (MHEC),Ethyl Cellulose (EC),Hydroxy Propyl Cellulose (HPC), Povidone,Sodium carboxy methyl cellulose,Polyethylene glycols (PEG),Acrylate polymers.
Enteric Coating
The tablet core gets disintegrated in the environment, so to prevent disintegration, enteric coating is used. This type of coating may be a one layer system or two layer system. It is non toxic, cheap and resists gastric fluids.
Specialized Coating
Compressed coating, electrostatic coating, dip coating, vacuum film coating are specialized coating techniques involving the use of a special machine.
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