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:
- a strand connects nozzle and pack
- product smears across the neck
- strings catch on subsequent containers
- label or closure surfaces become contaminated
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.
- elastic or adhesive product rheology
- product too cold or outside its normal process window
- slow or incomplete nozzle closure
- excessive nozzle-to-pack distance
- retraction beginning before cut-off is complete
Check in this order
Check 1
Record product temperature and compare with clean fills.
Check 2
Film the cut-off and retraction sequence in slow motion.
Check 3
Inspect nozzle seat and suck-back response.
Check 4
Test reduced travel distance and a different tip diameter.
Check 5
Compare a controlled heat or agitation condition if permitted.
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.
- use positive shut-off and controlled suck-back
- optimise the cut-off-to-retract delay
- select a nozzle tip that breaks the product cleanly
- stabilise product temperature
- add a diving or lift sequence matched to the fill
Prevent the problem returning
- retain settings by formulation and temperature
- clean product-contact shut-off parts consistently
- include tail length or pack cleanliness in acceptance criteria
- control idle time that allows product to cool or skin
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 product stringing and tails after filling?
Record product temperature and compare with clean fills.
What commonly causes product stringing and tails after filling?
Common causes include elastic or adhesive product rheology, product too cold or outside its normal process window, slow or incomplete nozzle closure.
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.