Film width guidance

Shrink wrap film width guide

Film width is a common reason for poor shrink wrapping results. If the film is too narrow the pack may not seal reliably; if it is too wide the tunnel has to shrink excess film, causing loose corners and waste.

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Shrink wrap film width guide for L sealers — Shrink wrap film width guide guidance from Lancing UK.

Start with the largest product

Measure the maximum product width and height including tolerance. Future product sizes should be reviewed before the machine and film stock are finalised.

Measure maximum product dimensions
Avoid excessive film allowance
Check seal position and pack stability
Test with real product samples

Allow for seal and movement

The film needs enough allowance to wrap the product and seal cleanly, but not so much that the finished pack has excessive film.

Test with real products

A film calculation is only a starting point. Samples help confirm the correct film width, perforation and 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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