Heat tunnel matching

Shrink tunnel for L sealer

The shrink tunnel is not an accessory to ignore. It controls the final pack appearance and must be matched to the L sealer output, film type, pack size and product heat tolerance.

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Shrink tunnel for L sealer line — Shrink tunnel for L sealer guidance from Lancing UK.

Tunnel aperture

The opening must accommodate the largest pack with clearance for film and airflow. Oversized tunnels may waste energy, while undersized tunnels cause contact or poor shrink.

Matched to sealer output
Aperture sized around largest pack
Belt speed controls dwell time
Airflow determines shrink consistency

Belt speed and dwell time

The film needs enough exposure to shrink properly without damaging the product or distorting the pack. Belt speed should be matched to the sealer cycle.

Airflow and temperature

Good airflow helps shrink the film evenly around corners. Temperature alone is not enough; air movement and tunnel length also affect quality.

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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