TABLETING
Inspecting tooling ultimately improves tablet quality
The LVS inspection device
length. Most reputable tooling vendors can provide an inspection report verifying conformance of the tool lengths for new tooling as well as other critical inspection data used as a basis to realise punch wear. It is recommended to establish inspection protocols to re-confi rm the adherence to the engineered working length tolerance. During the life of the tools, it is uncommon for the working length to deviate from the required tolerance, hence deviation is typically due to product fl ow, tablet press set-up and tablet press wear. When purchasing tablet compression tooling it is common to order spare punches in the case a single punch becomes damaged. Adding a spare punch in a set of in process tools can cause an inconsistency with tablet specifi cations due to the new spare punch being full length and absent of tool wear hence being longer than the in-process tools. Before adding the spare
punch in the set of in-process tools it is important to inspect the spare punch length to confi rm its length conforms to the working length of the in-process tools.
DIE BORE WEAR Inspecting for die bore wear is often overlooked during in-process tool inspection and until recently was often a visual inspection due to the lack of eff ective and aff ordable equipment to accurately measure this dimension. New technology has allowed this inspection to be performed eff ortlessly. Equipment such as the Wi- gauge quickly measures the die cavity for round dies and the minor dimension on shaped dies. T e Wi-gauge is an excellent tool to measure die wear and when used in Wi-Fi mode will display measured values on the hand-held unit and send the data to a computer to track, monitor and store die and segment measurements.
Once a die bore becomes ringed it
allows formulation to migrate between the punch tip and die resulting in excessive friction causing heat which can be related to tool binding, sticking and accelerated punch tip wear. Die bore wear can also cause capping, laminating and excessive tablet fl ashing, which can often be the culprit for weak and soft tablet edge causing havoc during tablet
Rotary press in lab
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