Recognise the symptom before changing settings
Describe what changes, where it first appears and whether it follows a product batch, packaging batch, filling head, lane, speed, temperature or time in the run. Typical observations include:
- visible bubbles in clear packs
- fill weight changes as bubbles collapse
- product appearance becomes lighter or whipped
- pump noise or erratic flow accompanies the issue
Likely causes to separate
A symptom can have several unrelated causes. Treat the following as hypotheses to test rather than a list of settings to change at once.
- high-shear mixing or recirculation
- suction-side leaks and vortexing
- pump cavitation from restriction or low inlet pressure
- free-fall into the hopper or container
- product held without enough deaeration time
Check in this order
Check 1
Take samples before and after each process stage.
Check 2
Inspect suction joints and observe vessel vortexing at the lowest level.
Check 3
Check pump inlet size, speed and product temperature.
Check 4
Compare gentle transfer and lower-shear filling.
Check 5
Allow a controlled sample to settle and record volume or density change.
Corrective actions to evaluate
After the cause is demonstrated, select the least disruptive correction that returns the process to a safe, repeatable and approved state.
- seal the suction path and prevent vortexing
- reduce pump speed or inlet restriction
- introduce product below the surface
- use lower-shear transfer and filling components
- add validated settling or deaeration where required
Prevent the problem returning
- define acceptable air content or density
- avoid unnecessary product recirculation
- set minimum vessel levels
- test start-up and end-of-batch conditions
Record evidence, not only the final setting
Capture the product and packaging batches, machine recipe, head or lane, speed, temperature, vessel level, symptom frequency, intervention and post-correction results. This creates a usable centreline and allows recurring loss to be prioritised through OEE or downtime analysis.
Common questions
What is the first check for air bubbles and aeration in filled products?
Take samples before and after each process stage.
What commonly causes air bubbles and aeration in filled products?
Common causes include high-shear mixing or recirculation, suction-side leaks and vortexing, pump cavitation from restriction or low inlet pressure.
Should the machine be adjusted immediately?
Change one controlled variable at a time after the measurement method, product condition, packaging and safety state are confirmed.
When should production be stopped?
Stop and follow the site safe-isolation and escalation procedure when there is risk of injury, contamination, fire or explosion, uncontrolled product release, damaged guards, unsafe pressure or an unverified quality result.
What information should be recorded?
Record product and pack batch, recipe, machine settings, filling head or lane, time, temperature, speed, symptom, corrective action and the evidence that performance returned to the approved condition.