Foaming ink creates instability and can signal serious fluid system issues. Here’s what to check.
What’s normal?
A stable CIJ system returns fluid to the tank in a smooth, continuous flow. Foam, frothing, or air bubbles are warning signs.
Common causes of foaming
| Cause | Fix |
|---|---|
| Air leak in return line | Tighten or replace tubing/fittings |
| Incorrect solvent mix | Flush system and refill with approved fluids |
| Over-agitation | Reduce pressure if above spec |
| Ink degradation (expired or contaminated) | Replace ink and run Clean Ink System |
| Incompatible cleaning agent used | Flush and refill with correct solvent |
How to fix it
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Inspect for cracked or loose tubing
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Check tank seals and tank vent
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Run Fill Mixer and observe return flow
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If foaming persists, replace fluid and filters