Labelling Machine Troubleshooting: Causes & Fixes

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Problems on this page:

Labels misaligned or skewed Labels not dispensing or web break Poor adhesion or lifting edges Wrinkled labels or air bubbles Missing labels on some containers Wrong or mixed labels Faint or missing date and lot codes on labels Long stops at every label roll change

Labels misaligned or skewed

Hits OEE: Quality

Symptoms: Labels crooked or in the wrong position, wrinkles, rejects.

Container speed mismatch

Match belt and roller speed to the product; sync the applicator.

Worn application rollers or brushes

Replace worn rollers and pads; check pressure.

Trigger sensor position off

Re-position the product sensor and apply point.

Prevention: Speed sync checks, roller maintenance, sensor calibration.

Labels not dispensing or web break

Hits OEE: Availability

Symptoms: No label applied, the web snaps, machine stops on a label fault.

Web tension wrong or liner break

Set tension; re-thread; check the peel edge for nicks.

Label gap sensor not reading

Calibrate the gap or contrast sensor.

Empty roll or splice fault

Reload; manage splices to avoid stops.

Prevention: Tension setup, sensor calibration, roll and splice management.

Poor adhesion or lifting edges

Hits OEE: Quality

Symptoms: Labels lift, corners curl, or fall off after packing.

Surface dirty, wet or cold

Clean and dry the surface; control container temperature.

Wrong adhesive for the substrate

Match adhesive to surface and temperature.

Low application pressure

Increase wipe-down pressure and brush contact.

Prevention: Surface prep, correct adhesive selection, wipe-down setup.

Wrinkled labels or air bubbles

Hits OEE: Quality

Symptoms: Creases and bubbles under the label, labels not lying flat around the container.

Uneven web tension

Set the unwind brake and dancer so the web runs at even tension.

Wipe-down brushes or pads worn or set wrong

Adjust and replace the wipe-down.

Container not held steady while labelled

Set the top belt or rotation and the container spacing.

Dispense speed not matched to line speed

Match the label dispense speed to the container speed.

Prevention: Wipe-down and tension checks at every changeover.

Missing labels on some containers

Hits OEE: Quality

Symptoms: Unlabelled packs found downstream, often only now and then.

Gap sensor not calibrated to the label stock

Recalibrate the label gap sensor at every roll or stock change.

Container sensor dirty or misaligned

Clean and align the product detection sensor.

Labels not releasing from the liner

Check the peel plate angle and the liner path.

Containers too close together

Set the infeed spacing so each container is seen separately.

Prevention: A label presence check with an automatic reject, tested every shift.

Wrong or mixed labels

Hits OEE: Quality

Symptoms: The wrong product label on a pack, or two label versions in one run.

Roll changed without a check

Scan or check the new roll against the order at every roll change and at line clearance.

Mixed labels spliced into a roll

Raise it with the label supplier and verify each label on the line.

No label verification on the line

Fit barcode or vision verification with a reject.

Prevention: Line clearance at every changeover and label verification with a reject.

Faint or missing date and lot codes on labels

Hits OEE: Quality

Symptoms: Codes printed on the label are faint, smeared, partly missing or unreadable.

Dirty or worn printhead

Clean the printhead on a schedule and replace a worn one.

Ribbon wrinkled or wrong for the label stock

Set the ribbon path and tension and use a ribbon matched to the label material.

Print settings wrong for the material

Set print darkness and speed for the label and ribbon in use.

Prevention: A code readability check at the start of each run and after every roll change.

Long stops at every label roll change

Hits OEE: Availability

Symptoms: The labeller stands for a long time at each roll end, often with no warning before the roll runs out.

No low-roll warning, or it is switched off

Fit or enable a low-roll warning so the next roll is ready.

No prepared splice or standard method

Prepare the next roll and splice in advance and write down the roll change method.

Rolls not to the agreed core or diameter

Agree the core size and roll diameter with the label supplier.

Prevention: Treat the roll change like a changeover: prepare it before the machine stops.

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

Stop the same fault coming back

Recurring labelling machine 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.

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