Tunnel troubleshooting

Shrink tunnel temperature problems

Shrink tunnel temperature problems can appear as wrinkling, loose film, scorching, distortion or uneven pack finish. The cause may be temperature, airflow, conveyor speed, film gauge, perforation or pack spacing.

Get specification advice View machines

Who this page is for

This page is for operators diagnosing poor shrink finish after the L sealer or sleeve sealer stage.

Specification checks

Set temperature versus actual tunnel behaviour
Conveyor speed and dwell time
Airflow vents and circulation
Film type and film thickness
Pack spacing through the tunnel

Questions to answer before a quote

Is the film loose or over-shrunk?
Is one side shrinking more than the other?
Has the conveyor speed changed?
Is the pack heat sensitive?

How Lancing UK can help

Lancing UK can review product sizes, pack photos, film choice, target output and site layout before recommending a suitable L sealer, heat tunnel, chamber sealer, sleeve sealer or related shrink wrapping machine route.

For the most accurate advice, send dimensions for the smallest and largest pack, expected packs per minute, whether the product is manually loaded or conveyor fed, and any space or utility restrictions on site.

FAQ