Why the wrapper and tunnel must match
A sleeve wrapper creates and seals the film sleeve; the shrink tunnel finishes the pack. If the tunnel is too small, too slow or poorly matched to the film, the pack finish can suffer even when the sealer itself is suitable.
For PE film multipacks, tunnel airflow, belt speed, temperature zones and pack spacing affect the final shrink result. The layout also needs enough room for infeed, tunnel discharge and cooling or handling after the tunnel.
System-level specification
- Film width and seal position from the sleeve wrapper.
- Tunnel aperture, belt width and product clearance.
- Heat settings, airflow and tunnel belt speed.
- Conveyor transfers before and after the tunnel.
- Finished pack handling, cooling and operator access.
| Sleeve wrapper | Controls film feed, product wrap and seal cycle. |
|---|---|
| Shrink tunnel | Controls heat, airflow, shrink finish and pack presentation. |
| Conveyors | Maintain spacing, transfer and finished pack discharge. |