Automatic L sealer machines
Related guidance for comparing shrink wrapping machinery, film, output and installation requirements.
Shrink wrapping troubleshooting
L sealer troubleshooting guide
Poor shrink wrapping results are usually caused by the relationship between product size, film size, seal settings and tunnel settings. This guide outlines common symptoms to check before changing machinery.
Weak or open seals
- Check sealing temperature and dwell time.
- Confirm the film type is suitable for the machine.
- Inspect the sealing blade, PTFE tape and contact area.
- Check that the product is not dragging the film during sealing.
Loose film after the tunnel
- Increase tunnel dwell time or adjust conveyor speed where appropriate.
- Check airflow and tunnel temperature.
- Confirm film size is not excessive for the product.
- Check pack spacing so the film is exposed evenly to heat.
Dog ears and poor corners
- Reduce excess film around the pack.
- Check that the product is centred before sealing.
- Review tunnel airflow around corners.
- Confirm the pack shape is suitable for the selected film.
Specification summary
For a reliable recommendation, send product dimensions, photographs, required output, film preference, available floor space, power and compressed air details. Lancing UK can then check the correct machine aperture, heat tunnel size, conveyor layout and operator access before quoting.
FAQ
L sealer troubleshooting guide FAQs
Why is my L sealer making weak seals?
Weak seals can be caused by low temperature, short dwell time, worn sealing parts, film mismatch or product movement during sealing.
Why is shrink film loose after the heat tunnel?
Loose film can indicate too much film, not enough heat, insufficient dwell time or poor airflow.
Can Lancing UK help with poor shrink wrapping results?
Yes. Lancing UK can review pack dimensions, film, machine settings and line layout to identify the likely cause.
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