TABLETING 59
SMARTER TABLET DESIGN
Bill Turner and Kevin Queensen explain how introducing land into tablet design will strengthen the punch
Tablet with blended land T
he design of a tablet plays an integral role in the functionality and longevity of tablet compression
tooling. Avoiding punch-tip wear when possible, and quickly identifying it when it does occur, will provide great benefi ts to the quality of tablets and to a manufacturer’s operation. Tablet defects, such as capping, lamination, and fl ashing, may be related to the punch tip’s land and edge wear. T e tablet land is the narrow,
horizontal surface perpendicular to a tablet’s periphery, which creates a junction between that periphery and the cup. T e three primary reasons for incorporating land into a tablet’s design are: to increase the strength of the punch tip’s edges; to increase the wear characteristics of the inner edge of the punch cup; and to
reduce the severity of nicks on the punch’s edges. Steps to strengthen the edge of the punch cup include reducing the slope of the cup, and more importantly, introducing an appropriate amount of land into the tablet’s design. On one hand, excessive land can make
it more challenging to coat a tablet. On the other hand, land adds strength and durability to the punch tip. Here, we provide some suggestions on how to reduce the issues related to coating the tablet and to increase the punch tip’s strength and durability.
Tablet coating T e edge of a tablet created by the junction of its face and its bellyband, or sidewall, is prone to erosion from the tumbling action in a coating pan. T e presence of punch-tip
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