Shrink tunnel troubleshooting

Heat tunnel temperature settings

Heat tunnel temperature is only one part of shrink wrapping quality. Belt speed, airflow, film width, perforation, film gauge and product heat tolerance all affect the final pack.

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Heat tunnel temperature settings for shrink wrapping — Heat tunnel temperature settings guidance from Lancing UK.

Temperature is not the only setting

Increasing temperature can sometimes make a poor pack worse. If the film is oversized or under-perforated, more heat may create holes or distortion instead of a tighter finish.

Check film width before changing heat
Balance belt speed and temperature
Use airflow to improve corners
Test settings with real products

Belt speed and dwell time

A slower belt increases heat exposure. A faster belt reduces exposure. The right setting is a balance between film shrink and product protection.

Airflow and product shape

Air needs to reach the corners and sides of the pack. Tall, irregular or closely spaced products may need different airflow, spacing or tunnel settings.

Specification information to send

Product	Send length, width, height, weight, photos and the largest and smallest pack sizes.
Film and finish	Confirm whether the priority is retail presentation, transit strength, tamper evidence or product protection.
Output	Confirm target packs per minute, daily volume, loading method and whether the product arrives from another machine.
Site	Confirm floor space, power, compressed air, conveyor height, access and any upstream or downstream equipment.

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