Packaging Line Troubleshooting: Causes & Fixes

Not your exact symptom?

Describe it in the symptom finder and search the whole directory.

Problems on this page:

Frequent jams / micro-stops Fill weight variation Labels misapplied Seal defects (leakers/weak seals)Missing or unreadable date/lot code Long changeovers Product damage or crushed packs Wrong or mixed product after a changeover

Frequent jams / micro-stops

Hits OEE: Performance

Symptoms: Many short stops per hour, operators constantly clearing, low rate.

Product/format variation

Tighten incoming spec; adjust guides for the format.

Worn change parts / guides

Replace worn star-wheels, guides, grippers; verify changeover setup.

Mis-set sensors

Re-teach/adjust photo-eyes and reject timing.

Line imbalance (starve/block)

Tune accumulation and machine speeds to the bottleneck.

Prevention: Format-specific setup sheets, change-part inspection, sensor checks, line balancing.

Fill weight variation

Hits OEE: Quality

Symptoms: Over/under-fill, giveaway, checkweigher rejects.

Filler valve/nozzle wear or fouling

Clean/replace nozzles and valves; check seals.

Product temperature/viscosity drift

Stabilise product temperature and supply pressure.

Worn pumps/flow meters

Calibrate or service metering; verify checkweigher.

Prevention: Routine calibration, nozzle maintenance, product condition control.

Labels misapplied

Hits OEE: Quality

Symptoms: Skewed, missing or wrinkled labels, reject spikes.

Web tension/threading wrong

Re-thread; set web tension; check dancer.

Dirty/worn applicator or rollers

Clean adhesive build-up; replace worn rollers/brushes.

Sensor/timing off

Adjust label gap sensor and apply timing to line speed.

Container handling unstable

Stabilise container in the labelling station; check guides.

Prevention: Tension/sensor setup sheets, cleaning schedule, applicator maintenance.

Seal defects (leakers/weak seals)

Hits OEE: Quality

Symptoms: Open seals, channel leaks, failed seal-integrity tests.

Seal temperature/time/pressure off

Set seal bars to validated temp/dwell/pressure.

Contamination in the seal area

Add seal-area cleaning/clearing; fix product splash.

Worn seal bars/jaws or film fault

Inspect/replace seal jaws; verify film spec.

Prevention: Seal validation, seal-area cleanliness, jaw inspection, film QA.

Missing or unreadable date/lot code

Hits OEE: Quality

Symptoms: Coder misses prints or codes are unreadable, compliance rejects.

Printhead dirty or low ink/ribbon

Clean the printhead; replace ink/ribbon/fluids.

Trigger/encoder timing off

Check the product trigger and encoder; re-time the print.

Substrate or speed mismatch

Match settings to substrate and line speed; verify with a scanner.

Prevention: Coder cleaning schedule, trigger checks, print verification.

Long changeovers

Hits OEE: Availability

Symptoms: Format changes take longer than planned and vary by crew.

No standard changeover method

Write and train one method for each change.

Parts and tools hunted for

Use shadow boards and carts for each format.

Settings found by trial

Mark settings and use scales or counters.

Machines changed one after another

Plan parallel work along the line.

Prevention: Changeover times recorded and reviewed.

Product damage or crushed packs

Hits OEE: Quality

Symptoms: Dented, crushed or scuffed packs at transfers or accumulation.

High line pressure in accumulation

Reduce backpressure on the conveyors.

Guides set too tight

Set guides for the format.

Speed mismatch at transfers

Match the speeds at the transfers.

Prevention: Guide settings marked for each format.

Wrong or mixed product after a changeover

Hits OEE: Quality

Symptoms: Packs or labels from the last run found in the new run.

Line clearance not done or not checked

Do a line clearance with a sign-off.

Leftover labels or packaging at the machine

Reconcile and remove the previous materials.

Vision or code checks not updated

Verify the checks for the new product before start-up.

Prevention: Line clearance checklist at every change.

Guidance only. Always follow lockout/tagout and your site's safe-work procedures, and verify against OEM manuals before acting.

Related equipment guides: filling machine · capping machine · labelling machine · cartoner · strapping machine · X-ray inspection

Stop the same fault coming back

Recurring packaging line stops usually trace to a cause you cannot see by hand. The partner we recommend is Fabrico: it tracks OEE and downtime live from PLCs, IoT sensors or AI cameras; where cameras are fitted, the video of a stop sits next to its machine data so the cause can be reviewed; and a technician opens the work order from the stop in the same system. Data is hosted in the AWS EU region, and Fabrico and the company behind it hold ISO/IEC 27001, ISO/IEC 20000-1 and ISO 9001.

Book a Fabrico demo

The directory stays free.

Methods that cut recurring stops: the six big losses · root cause analysis · preventive vs predictive maintenance · TPM · SMED & changeover