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:
- nozzles strike the neck
- product lands outside the opening
- intermittent missing fills occur
- misalignment changes with line speed
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.
- guide rails too wide or incorrectly profiled
- variable bottle dimensions or unstable bases
- worn indexing stops, screws or timing components
- sensor detects the wrong feature or sees through the container
- back-pressure disturbs the indexed group
Check in this order
Check 1
Mark the container centreline and observe repeatability at slow speed.
Check 2
Measure pack variation from several supplier batches.
Check 3
Check guides, stops, belts and sensors for movement or wear.
Check 4
Run with and without upstream back-pressure.
Check 5
Verify the nozzle pattern against the indexed pitch.
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.
- profile and set guide rails for the approved pack
- repair the indexing mechanism and remove play
- use suitable sensors and stable detection points
- control upstream accumulation pressure
- add neck handling, puck handling or format parts where necessary
Prevent the problem returning
- retain centreline settings
- approve packaging tolerances with suppliers
- inspect high-wear handling components
- test empty, part-filled and full pack stability
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 bottles misaligned under filling nozzles?
Mark the container centreline and observe repeatability at slow speed.
What commonly causes bottles misaligned under filling nozzles?
Common causes include guide rails too wide or incorrectly profiled, variable bottle dimensions or unstable bases, worn indexing stops, screws or timing components.
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.