Seal wire replacement
Check spare-part evidence.
Seal faults
L sealer seal contamination troubleshooting
Contamination in the seal area can create weak, inconsistent or sticking seals and should be checked before replacing parts.
Seal area
How contamination affects seal quality
Seal contamination can come from product dust, film residue, adhesive, labels, loose fibres or debris. It can prevent consistent heat transfer and may cause sticking, drag marks or incomplete separation.
Before replacing a seal wire or blade, record the contamination source, film type, product handling and how the fault appears across several packs.
| Check | How to assess it | Acceptance evidence |
|---|---|---|
| Visible residue | Inspect wire/blade, release surface and surrounding film path. | Clean area and identify repeat source. |
| Sticking film | Look for adhesive, overheated film or damaged release surface. | Check dwell, temperature and release condition. |
| Weak seal | Check contamination, wire condition, film mismatch and alignment. | Separate material fault from hardware fault. |
| Repeat pattern | Compare fault location against product edges or labels. | Identify whether the product is carrying contamination into the seal. |
Evidence
Information to record before requesting support
- Clear photos of the seal area and failed seal.
- Film type, thickness and batch if known.
- Product surface and any labels, dust or loose material near the seal area.
- Current settings and whether the fault started after changeover.
- Whether cleaning temporarily improves the problem.
FAQ
Questions about this topic
Can contamination look like a worn seal wire?
Yes. Contamination can create weak or inconsistent seals that resemble a worn-part fault.
Should the seal area be cleaned hot or cold?
Follow machine-specific safety and maintenance instructions; do not clean a hot or energised seal area unless the instructions permit it.
Can product dust cause seal problems?
Yes. Dust or loose material in the seal path can prevent clean sealing and cutting.