Problem & answerP-04
Poor Powder Flow
Also covers: High Carr’s Index or Hausner Ratio
Likely causes
- Fine or irregular particles
- High moisture or static
- Insufficient glidant
- Under-granulation
How to fix it
- 1Calculate Carr’s Index and Hausner Ratio and compare with the flow scale (Section 8.5).
- 2Check moisture and room RH.
- 3Confirm glidant was added correctly.
- 4Notify QA; formulation changes need change control.
Technical note
Poor flow causes weight variation, machine stoppages, hopper bridging, inconsistent filling, segregation and reduced output on the downstream filler.It is fixed when
Flow class acceptable for the downstream process.
Stop it coming back
- Test density on every batch and trend results.
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