Troubleshooting guide

L sealer and shrink tunnel troubleshooting

Poor shrink wrapping results can come from the sealer, film, tunnel or product handling. Troubleshooting should isolate one variable at a time.

Key checks for L sealer shrink tunnel troubleshooting

Poor shrink wrapping results can come from the sealer, film, tunnel or product handling. Troubleshooting should isolate one variable at a time.

Check seal wire condition, dwell, temperature, film contamination, jaw alignment and film tension before changing multiple settings.

Review tunnel temperature, conveyor speed, perforation, film type and the amount of air trapped inside the pack.

Light or unstable products may shift during transfer. Check infeed, belt speed, spacing and product support.

Product range	Largest and smallest pack dimensions, product weight, photographs and notes about pack stability.
Production target	Required packs per minute, daily volume, shift pattern and expected changeover frequency.
Film and finish	Preferred film type if known, presentation standard, seal position and any retail requirements.
Site information	Available floor space, power, compressed air, access route, conveyor height and downstream packing method.

FAQ

What causes weak seals?

Worn consumables, wrong settings, contaminated film or alignment issues are common causes.

What causes ballooning?

Trapped air and insufficient perforation are common causes.

Should I adjust all settings at once?

No. Change one variable at a time so the cause is clear.

Use these pages to compare machinery routes before requesting a quotation.