FAT/SAT checklist
Use acceptance criteria in sign-off.
Pack quality
L sealer pack quality acceptance criteria
Agreeing a good-pack standard makes sample trials, FAT, SAT and troubleshooting more objective.
Quality standard
Define acceptable shrink wrap before testing
Pack quality can be subjective unless the buyer and supplier agree what should be accepted. For L-sealer projects, the standard should include seal strength, seal position, film clarity, wrinkles, trapped air, barcode visibility and post-tunnel handling.
A useful acceptance standard also states which defects are cosmetic, which are functional and which make the pack unsuitable for release.
| Check | How to assess it | Acceptance evidence |
|---|---|---|
| Seal position | Seal lands away from critical artwork, openings and unstable edges. | Good/reject photos for each product family. |
| Seal integrity | No splits, open corners, burn-through or contamination marks. | Manual check or retained samples after trial. |
| Tunnel finish | Controlled wrinkles, no severe dog-ears and acceptable presentation. | Photos at tunnel exit and after cooling. |
| Post-cooling handling | No marking, distortion or barcode visibility issue after discharge. | Inspect after normal handling process. |
Acceptance examples
Useful evidence for pack quality decisions
- A photo of the ideal finished pack from each main product type.
- A reject sample showing the worst unacceptable seal, wrinkle or distortion.
- A note on which face must remain display-ready.
- A note on whether barcodes, tamper evidence or labels must remain visible.
- A first-off approval method after changeover.
FAQ
Questions about this topic
What is a good L-sealer pack?
A good pack meets the agreed seal, shrink, presentation and handling standard for that product.
Should every wrinkle be rejected?
Not always. The acceptance standard should state which wrinkles are acceptable and which affect presentation or function.
Why keep reject examples?
Reject examples make future troubleshooting and operator training more consistent.