Weak, wrinkled or burnt seals are the most common complaint on a pouch packing line. On a continuous band sealer, almost every seal problem comes down to the balance between two settings: temperature and belt speed.
How the two settings interact
The film only spends a short time against the heater. That time depends on belt speed. So:
- Higher speed means less time in the heat, so you need more temperature.
- Lower speed means more time in the heat, so you need less temperature.
Common problems and fixes
| Problem | Likely cause | Try this |
|---|---|---|
| Seal peels open easily | Not enough heat | Raise temperature a little or slow the belt |
| Seal is wrinkled or shrunk | Too much heat | Lower temperature or speed up the belt |
| Burnt or brown seal | Far too hot | Lower temperature well before changing speed |
| Seal good on one side only | Film not centred | Guide the pouch mouth straight into the bands |
Film thickness matters
Thin poly films need gentle heat. Multi-layer laminates are thicker and need more heat or a slower pass. Always test a few empty pouches when you change film, then a few filled ones.
Start from a known setting
Write down the temperature and speed that worked for each pouch type and keep it next to the machine. New operators get consistent seals from day one.
Our CS900 band sealer lets you set 0 to 300 deg C and 0 to 12 m per minute, so it covers both thin poly and thick laminates. Specs: PackForge CS900 band sealer
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