A tablet is a mixture of active substances and excipients, usually in powder form, pressed or compacted into a solid. A coating may be applied to hide the taste of the tablet’s components, to make the tablet smoother and easier to swallow, and to make it more resistant to the environment, extending its shelf life. Modern tablet coatings are polymer and polysaccharide based, with plasticizers and pigments included. Tablet coatings must be stable and strong enough to survive the handling of the tablet, must not make tablets stick together during the coating process, and must follow the fine contours of embossed characters or logos on tablets. Coating can also facilitate printing on tablets.
The present presentation contains all the information regarding causes and solutions of coating defects like
Tablet surface erosion
Splitting and peeling
Tablet to tablet colour variation
Within tablet colour variation
Key words: twinning, orange peel
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