Inline and side-feed layouts solve different product-transfer problems
An inline sleeve sealer moves the pack in the same general direction through the film and towards the tunnel. A side-feed sleeve sealer presents or pushes the pack across the film path, often at right angles to the tunnel direction. The better route depends on product stability, collation, support, format range and factory layout.
Both layouts still need compatible film, seal clearance, tunnel performance, cooling and line controls. A representative trial should show that the chosen transfer keeps the bundle controlled before the film can support it.
Compare the transfer principle
| Question | Inline route | Side-feed route |
|---|---|---|
| How does the pack travel? | Normally continues through the film in the same line direction. | Is presented or pushed across the film path towards the tunnel. |
| How is collation maintained? | Relies on stable transfer, guides and controlled product flow. | Can use a positive push and support arrangement to form or transfer the group. |
| What pack types need attention? | Small, trayless or unstable groups may need additional transfer support. | Pusher contact, clamp or guide arrangement must suit each format. |
| How does it affect layout? | Can suit a straight end-of-line route. | Can turn the product flow and may suit different space or collation needs. |
| What must be trialled? | Gap crossing, film entry, seal position and continued stability. | Bundle formation, push contact, film entry and release towards the tunnel. |
Use product stability to choose the first route to test
- Observe how the unwrapped group behaves on the current conveyor.
- Identify whether the group can cross transfers without losing its pattern.
- Determine whether a positive push, clamp, tray or pad is needed.
- Place both layouts on the measured site plan with access and guarding.
- Trial the boundary format through sealing, tunnel, cooling and discharge.
Do not separate feed layout from line controls
The chosen layout changes sensor positions, product-release logic, accumulation and the response to a missing or misaligned item. Define how the system prevents an incomplete bundle entering the film and how it stops when the tunnel or discharge is unavailable.
- Confirm line direction and datum heights on a drawing.
- Include the longest and shortest format in the transfer trial.
- Test a missing product and a blocked discharge.
- Keep maintenance and film-loading access clear in the final footprint.