Bottle checkweigher

controltabletfilling

Pharma Packaging Systems offer a fully integrated check weighing systems to either gross or Tare/gross weight bottles during the packaging process to add a further layer of quality control. Gross weigh systems will weigh filled bottles to confirm that the combined weight of the pack and products is within the expected range for the configuration. Where there is a nonconformance the bottle is rejected from the line. The limitations of gross weigh only is that bottle weights will have a standard deviation as will the product so these need to allowed in the target weight range to avoid false rejects. Tare/Gross systems offer a higher level of control as the system allows weighing of the empty bottle before filling with products and this value is recorded and retained within the system. The bottle is now indexed to the filling position where the tablets are dispensed and on completion of filling the bottles are indexed to another weighing station where the filled weight is captured. The system will now deduct the empty bottle weight from the total weight and so allow the weight of the product only to be compared to and expected target. This method allows higher accuracy as the bottle weight variation (far greater deviation than tablet weight) to be excluded from the calculations. The method used in both PPS weighing system is considered “static weighing” in that the bottle is not in contact with anything other than the precision load cell when the weight a captured and as such weigh accuracy can be more precise.