Problem & answerB-07
Powder Leaking from the Dosing Station
Also covers: Dosing plate clearance adjustment
Likely causes
- Clearance between dosing disc and sealing (bushing) ring worn or incorrectly set
- Damaged sealing component
How to fix it
- 1Stop and isolate the machine.
- 2Check the clearance between the dosing disc and sealing ring with a feeler gauge. Typical setting: 0.03–0.08 mm.
- 3To adjust: withdraw the baffle and loosen the fastening screw on the adjusting base.
- 4Turn the adjusting knob anticlockwise to lower the sealing ring, then clockwise to raise it to the target clearance.
- 5Re-tighten the fastening screw.
- 6Replace damaged sealing components.
- 7Carry out a capsule weight test after any clearance change (see B-04).
Technical note
Open the clearance slightly for coarse powders; too tight a clearance increases friction between the disc and the sealing ring. Machines with a three-dimensionally adjustable dosing plate are designed to minimise this leakage.It is fixed when
No powder escaping around the dosing disc; fill weight in specification.
Stop it coming back
- Check dosing clearance at every format change.
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