Definition: The term is used when either the upper or lower part of the tablet separates horizontally either partially away from the main body or completely and forms a cap when ejected from the press or during the handling process.
Cause: This happens when air is trapped during the compression stage and when the tablet expands after being ejected from the die.
Tablet binders are one of the most essential elements in the formulation of a tablet. Because they promote cohesiveness, the binders, also called adhesives, help the other ingredients in a tablet to mix together. Tablet binders are used to turn powder to granules; this is achieved through the process of granulation. During granulation, powder substances are accumulated to form larger particles called granules.
There are two principal methods of coating tablet: sugar coating and film coating. Both have advantages and disadvantages, and the following table provides a comparison between the two methods. The choice of which method is appropriate depends to an extent on how the tablets have been produced, the composition of the tablet and the intended market.
Description: Double Impression includes punches that embed monograms or images on tablets.
Cause: During the impression stage, each tablet undergoes imprinting. In the said stage, engraving machines imprint on the tablet; with the double imprinting, the lower punch might be uncontrolled and drops freely the short distance causing a new imprint on the tablet producing the double imprint on the tablet.
Description: The term “Binding” is used when the tablet sticks to, takes hold or splits during the molding / pressing process.
During the process, a film is built on the molding or die area restraining the ejection of the tablet. If there is excessive binding, the sides of the tablet might cracked or crumble.
Cause: Binding usually occurs when there is little or lack of lubrication, too much moisture in the granules used and using worn out or old dies.
Coating tablets with a thin polymer film can be an effective way to give your products a professional edge. High quality tablets can be quickly and easily produced using a tablet coating machine and the correct excipients . Unfortunately several defects can arise with coatings. The following list provides helpful remedies for common issues that may be encountered.