Format changeover should be defined before the machine is selected
A sleeve sealer format changeover is the controlled switch from one approved pack format to another, including guides, film width, sealing position, tunnel settings, first-off inspection and any recorded setting changes.
For one production line, several packs may share the same machine, but they may not share the same film width, conveyor guide position, tunnel condition or handling requirement. Changeover planning helps decide whether a format is practical for the same route or needs a different approach.
What can change between formats?
| Variable | Why it matters | Information to record |
|---|---|---|
| Pack dimensions | Sets clearance, film path and tunnel loading. | Length, width, height and weight of every format. |
| Bundle pattern | Changes stability and collation behaviour. | Rows, count, orientation, tray or pad support. |
| Film width and gauge | Controls overlap, seal position and shrink force. | Approved roll details for each format. |
| Guides and transfers | Keep the pack square and avoid snagging. | Guide settings, transfer plates and stop positions. |
| Tunnel settings | Different loads can need a different shrink window. | Approved temperature, belt speed, airflow and spacing. |
| First-off approval | Prevents a format being run with poor pack integrity. | Signed-off seal, shrink, cooling and handling checks. |
Changeover routine to build into the project
- Group formats by similar dimensions, film and handling needs.
- Identify the largest and least stable format in each group.
- Decide which settings must be tool-free, recorded or engineer-adjusted.
- Define the first-off pack inspection and reject boundary.
- Record the approved settings after the trial or FAT.
Questions buyers ask about changeover
Can one sleeve sealer run several pack sizes?
One sleeve sealer may run several pack sizes when the sizes, film route, tunnel window and handling requirements fit within the approved machine configuration.
The exact range should be tested or reviewed using real samples, not assumed from the largest catalogue dimension alone.
What is a first-off check after changeover?
A first-off check confirms that the first accepted pack after changeover has the agreed film position, seal quality, shrink finish, cooling condition and handling strength.
It should be recorded against the format so operators have a repeatable standard for the next run.