Automatic L sealer with shrink tunnel
Related advice for comparing shrink wrapping machinery, film, output and installation requirements.
Complete shrink wrap line
L sealer with shrink tunnel UK
An L sealer with shrink tunnel gives a complete shrink wrapping route: film folding, L-shaped sealing and controlled heat shrinking. The correct pairing depends on pack size, film type, output and the finish required after the tunnel.
Why the sealer and tunnel must match
A strong L seal will not produce a clean pack if the tunnel is too small, too short or too slow for the product. The tunnel aperture, belt speed and airflow need to match the seal output and film type.
- Automatic sealing and heat shrinking in one line
- Matched tunnel aperture and conveyor speed
- Clean presentation shrink for retail packs
- Suitable for UK production and packing rooms
Best-fit pack types
This route suits boxes, books, printed packs, retail cartons, small kits, stationery, cosmetics and electronics packaging where a neat presentation wrap is needed.
Line layout checks
Measure infeed space, operator access, outfeed clearance, conveyor height, power, air and future product sizes before choosing the equipment.
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. |
FAQ
L sealer with shrink tunnel UK FAQs
What does the shrink tunnel do?
The tunnel applies controlled heat after the film is sealed so the film tightens around the product.
Can the tunnel be used with different film?
Tunnel temperature, belt speed and airflow can usually be adjusted, but POF and PE film behave differently and must be checked.
What information do you need before quoting?
Product size, pack weight, film type, required output and available site space are the most useful details.
Related pages
Compare related shrink wrapping machinery options
These pages help narrow the best machine route before requesting a quotation.
Heat tunnels
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Contact Lancing UK about L-sealer machinery
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Sealer and tunnel match
Why the L sealer and shrink tunnel must be specified together
A buyer may search for an L sealer with shrink tunnel as a single machine choice, but the two stages solve different parts of the process. The sealer determines film overlap, seal integrity and pack transfer. The tunnel determines film recovery, corner finish, clarity, temperature exposure and how stable the pack remains before downstream handling.
- Check the tunnel aperture against the tallest and widest wrapped pack, including loose film before shrinking.
- Confirm whether tunnel airflow needs to favour presentation shrink, heavy-duty transit film or barcode visibility.
- Use dwell time and conveyor speed together; a hotter tunnel is not automatically a better tunnel.
- Leave enough discharge length for cooling before the pack is boxed, stacked, labelled or accumulated.
- Use sample packs to confirm finished-pack quality, especially with irregular cartons or multi-pack products.
Finished-pack defects to check during a trial
| Defect | Likely area to review | Evidence to record |
|---|---|---|
| Dog ears or loose corners | Film size, air release, tunnel dwell, airflow and pack geometry. | Photos of all corners after cooling. |
| Weak or open seal | Seal wire/blade condition, dwell, pressure, temperature and film suitability. | Close-up of seal line before and after tunnel. |
| Scorch marks or distortion | Tunnel temperature, airflow concentration, dwell time and product heat sensitivity. | Run settings and sample comparison. |
Continue with: heat tunnels · airflow guide · conveyor speed guide · film guide
Sealer and tunnel matching
Why the L sealer and heat tunnel should be specified together
A clean L seal is only part of the finished pack. The heat tunnel controls film recovery, wrinkles, dog-ears, trapped air, distortion and cooling behaviour. For that reason, a sealer and tunnel should be considered as a linked system.
The important checks are tunnel aperture, conveyor speed, dwell time, temperature profile, airflow pattern, film type and the distance available before the pack is handled after shrinking.
| Point to confirm | What Lancing checks | Why it matters |
|---|---|---|
| Tunnel aperture | Product height and width with safe clearance. | Avoids rubbing, unstable packs and heat concentration around high points. |
| Dwell time | Conveyor speed and tunnel length relative to film recovery. | Controls shrink finish without over-heating or under-shrinking. |
| Airflow | Even air movement around pack faces, corners and trailing edges. | Reduces wrinkles, dog-ears and uneven presentation. |
| Cooling | Outfeed distance and pack handling after the tunnel. | Prevents soft film being marked before it stabilises. |
Cooling and pack distortion guide
Control post-tunnel cooling and distortion.
Pack quality acceptance criteria
Define good-pack and reject standards.
FAT/SAT checklist
Agree acceptance checks before shipment and installation.
Final specification FAQs
What causes wrinkles after the tunnel?
Wrinkles can result from incorrect film size, insufficient perforation, uneven airflow, short dwell time or product movement.
Can tunnel settings fix every problem?
No. Film width, seal position, product shape and pack stability also need to be correct.
Why does cooling matter?
Film may remain soft immediately after shrinking; handling it too soon can mark, distort or weaken the presentation.
Useful next step: Send product dimensions, photos, film details and target output through the existing enquiry form so Lancing can check the L-sealer route before quotation.