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60 TABLETING


Close-up of blended land


land results in a small lip or ridge around the tablet’s periphery, and the junction of the land and the cup face can result in a sharp inside corner on the tablet. To avoid difficulties during the coating process, the land should have a generous blend radius at this junction, which will eliminate the sharp corner by adding a curved transition between the two surfaces.


Punch tip’s strength and durability


Te cup determines the configuration and appearance of the tablet’s faces. With normal use, punches show the most wear at their tip edges, which reduces the cup’s depth. Most tablet punches have a cup- depth tolerance of ±.003in (.076mm). Tis tolerance is widely accepted by the tablet compression industry, and most tooling manufacturers worldwide use it. While the published tolerance is adequate for most applications, it can be too liberal when manufacturing small, shallow-cup tablets or too conservative when manufacturing large, deep-cup tablets. Customers’ requirements and


preferences force many tooling vendors to minimise land width, which is usually only approximately 5% of the cup’s depth. Knowledgeable tablet designers indicate that land width should be closer to 10% and occasionally as much as 25% of the cup’s depth, especially for difficult-to- compress tablets that require high forces. Such designers consider a punch tip with


www.scientistlive.com Allowable deviation in cup’s depth


no land, i.e. a razor-sharp edge, to be unwise. Having sufficient land in your tablet’s design adds strength and wear resistance to the punch tips, both on the inside of the cup and on the outside of the tip, while creating a more robust tablet and enhancing tablet stability.


Also, it is common that a tooling manufacturer will suggest a wider land when a tablet requires a compound cup design. When a punch cup is excessively deep or the concavity of the cup is steep nearest the edge, as with some compound cups, the cup’s configuration


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