Automatic L-sealers
Review automatic machine routes.
Line control
L sealer infeed spacing and product detection
Stable spacing and reliable product detection are essential for repeatable automatic L-sealer operation.
Product flow
Why spacing matters before the seal area
The sealing cycle depends on the product reaching the film and seal area in a predictable position. If packs arrive too close, skewed or unstable, the machine may seal in the wrong place or create inconsistent packs.
For automatic L-sealer projects, the infeed arrangement should be specified with the product, not treated as a simple conveyor afterthought.
| Check | How to assess it | Acceptance evidence |
|---|---|---|
| Product gap | Distance between consecutive packs before detection. | Consistent gap with no double-feeding or contact. |
| Sensor point | Detection face and leading edge behaviour. | Stable trigger point before the sealing cycle. |
| Guide rails | Product control without rubbing artwork or labels. | Straight product entry into the film path. |
| Transfer height | Infeed, sealer and tunnel heights. | No step or drop that disturbs pack position. |
Line layout guide
Check conveyors and footprint.
Project specification template
Record line-control data.
Troubleshooting
Symptoms of poor spacing or detection
- Seal position moves from pack to pack.
- Products arrive touching or overlapping.
- Sensor triggers on reflections, artwork or loose film.
- Packs turn as they enter the film path.
- Tunnel finish varies because packs are skewed or off-centre.
FAQ
Questions about this topic
Can product detection be adjusted for different pack sizes?
Often yes, but each size should be checked with the guide and sensor position.
Does infeed speed control output?
It affects output, but the sealing cycle, tunnel dwell and discharge handling also matter.
Should this be tested with real products?
Yes. Box gloss, colour, shape and stability can all affect detection and transfer.