15
BÜCHI Mini Spray Dryer B-191 5 Operation
11. The spray process should now be constantly monitor-
ed. In addition to constant temperatures, care should be
taken that the nozzle does not become clogged. If this
should happen, the nozzle must be cleaned immediately,
either manually or by increasing the cleaning interval of
the pneumatic nozzle cleaner. A clogged nozzle can lead
to the product feed hose bursting.
12. Product deposits on the glass parts can possibly be remov-
ed with light tapping.
Any change to the system and/or the spray parameters (in-
crease in nozzle cleaning interval, change of air flow, etc.), no
matter how minor, can lead to a change in the physical pro-
perties of the product (dry content, particle size, etc.).
5.3 End of spray process
1. Distilled water should continue to be sprayed for a short
time at the end of the spray process, in order to remove
product deposits from the hoses and the nozzle.
2. Pump the hoses empty, turn off the peristalsis pump and
lower pump bed.
3. Turn off nozzle cleaner.
4. Turn off heating.
5. The system now cools down to the surrounding tempera-
ture by itself.
6. As soon as the temperature in the apparatus sinks below
70°C, the aspirator can be turned off.
7. The receiving vessel with the product can now be removed.
This should not be done when the aspirator is on since
there is the possibility that the air stream could blow the
product out of the receiving vessel into the surrounding
area.
8. The glass assembly, hoses and the nozzle should be clean-
ed with water after every spray process.
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