How do I reduce material waste and rejects during L-sealing?
Practical guidance for L-sealing: reduce product loss, damaged packs, film waste and avoidable rejects.
Direct answer
For L-sealing, measure where material or product is lost and calculate waste per good pack. End-of-line equipment must receive stable products at a controlled rate and create a pack that survives handling, storage and transport. Start by separate product, packaging and rework waste and record good packs per minute, material use, seal or closure quality and transport damage. Make one controlled change at a time so the original cause is not hidden by several new settings.
L-Sealer Machines
See the machinery and application options most closely matched to this production question.
What usually causes this?
- overfilling, over-application or excessive trim used as a safety margin
- A change in product grouping and spacing or film, carton, case or tray quality.
- start-up and changeover settings not standardised
- The equipment or handling method not being set for making a closed film envelope before a shrink tunnel.
- damaged or misfed packaging creating repeated rejects
Checks to make in order
- Separate product, packaging and rework waste
- Record good packs per minute, material use, seal or closure quality and transport damage using a representative sample.
- Weigh or count loss during start-up, running and changeover
- Check machine entry and transfer control, heat, tape, glue or closure settings and finished-pack inspection and discharge.
- Record the reason for every reject in a sample period
- Check whether waste changes with speed or pack size
- Calculate the financial value of giveaway and damaged packs
How to decide the next step
L-sealing involves making a closed film envelope before a shrink tunnel. Prioritise the largest measured loss, then verify that the change does not reduce seal, dose or closure quality.
If adjustment and maintenance cannot hold the required result across the complete product and pack range, compare the machinery route against a written acceptance test. The important comparison is sustained good output—not only maximum cycle speed.
What to include in your production brief
Supplying the information below makes it much easier to distinguish a setup problem from a machinery or packaging limitation:
- Product and finished-pack dimensions
- Pack pattern and orientation
- Film, board, tape or case specification
- Required output
- Conveyor height and direction
- Transport and stacking test
- Samples that represent l-sealing
- A short video of the current process and fault
Relevant solution websites
These specialist sites match the production process discussed above. Final suitability should be confirmed with samples, output, site and acceptance information.
Related questions
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