Shrinkwrapping involves wrapping a product in a plastic film which, under the effect of heat, shrinks to fit its shape. This solution is useful for bundling, protection and certain food applications.
To remember: the process takes place in 2 stages – sealing then shrinking – in a chamber (compact) or via a tunnel (high-speed).
Contents
Principle (2 phases)
| Phase | What’s happening | Objective |
|---|---|---|
| Welding | The frame seals and closes the film around the product | Form a neatly sealed package. |
| Shrinkage | Transfer to heated zone (bell or tunnel) | Stretch the film, expel air and obtain a clean finish. |
Bell vs tunnel
Bell machines
- Compact: welding + shrinking in one chamber.
- Interesting for low/medium output.
- Possibility of welding alone, depending on model.
Shrink tunnel
- Continuous flow: higher productivity.
- Stable quality: controlled temperature and air flow.
- Cooling on exit: film freezes quickly.
Film types
| Film | Features | Uses |
|---|---|---|
| Polyolefin (PO) | Glossy, resistant, food standard | Food/cosmetics, premium rendering. |
| PVC | Easy to shrink at low temperatures, less responsible | Specific uses. |
| Polyethylene (PE) | Thicker, more resistant | Shrink-wrapping (packs), logistics. |
Setting tips
- Temperature: too hot → pierced film; too cold → wrinkles.
- Perforation: micro-perforation to allow air to escape.
- Centering: position the product facing the air flow to limit distortion.
FAQ (SEO optimized)
Why is it necessary to perforate the film?
To allow air to escape during shrinkage and avoid bubbles, wrinkles and finish defects.
Bell or tunnel: which is better?
The cloche is ideal for small footprints and moderate throughputs. The tunnel is ideal for continuous flow and higher productivity.
Learn more
Would you like to choose the right film (PO/PE) and size the equipment according to your output and formats?