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:
- drops land on the container neck or conveyor
- a tail forms as the nozzle retracts
- dripping continues when the line stops
- only one nozzle leaks
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.
- residual pressure trapped downstream of the metering device
- damaged nozzle seal or valve seat
- nozzle bore or tip geometry unsuitable for the product
- fill acceleration or cut-off too abrupt
- hose height and siphoning effects
Check in this order
Check 1
Identify whether the drip occurs during cut-off, retraction or idle time.
Check 2
Compare all nozzles at the same recipe to isolate a head-specific fault.
Check 3
Inspect valve seats, O-rings, springs and product build-up.
Check 4
Reduce pressure and observe whether the symptom changes.
Check 5
Test suck-back, positive shut-off or a different nozzle with the actual product.
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.
- restore the shut-off valve and seals
- reduce residual pressure without starving the fill
- tune cut-off and suck-back settings
- use a positive shut-off, diving or product-specific nozzle
- change hose routing where siphoning is confirmed
Prevent the problem returning
- clean nozzle tips before deposits harden
- standardise cut-off settings by recipe
- keep wear parts and seal kits available
- include drip performance in the factory acceptance test
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 filling nozzle dripping after the dose?
Identify whether the drip occurs during cut-off, retraction or idle time.
What commonly causes filling nozzle dripping after the dose?
Common causes include residual pressure trapped downstream of the metering device, damaged nozzle seal or valve seat, nozzle bore or tip geometry unsuitable for the product.
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.