
Pan Pressure & Pan Speed
Source : Yenchen Technical Process Consultant, Dr. Fred Rowley
1. Pan Pressure
- Never positive
- Usually between -0.1" H2O and -0.5" H2O.
- Never more than -1.0" H2O
- Wrong setting
- Clogged bag house
- Bag house purge is not working, pulses too strong
- Gain on the coating pan controller (PLC) is not correct
- Seals on the exit plenum are damaged
2. Pan Speed
- There is no single specific setting.
- This is a relative setting based on tablet size, shape and load.
- Experience and observation are the initial basis of good science.
- Two basic pan speeds for each product:
- Initial speed to achieve a basic covering
- steady state speed.

- Tablets in a coating pan rotate in a slip-stick manner.
- Illustration of stick-slip model:
-Tablets in red region flow downstream, to the right, whereas particles in blue region rotate clockwise with the drum.
If you have any technical questions, please contact with Grace Chiang Email:grace.chiang@yenchen.com.tw
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