Continuous Sealers: Automating your packaging for industrial production rates.
Widely used in the food, pharmaceutical, and cosmetic industries, continuous sealers (or rotary sealers) are designed for companies looking to radically streamline their packaging process. Unlike manual, intermittent machines, they perform thermal seals thanks to the uninterrupted movement of bags on an integrated conveyor.
Absolute versatility across materials
Faster, smoother, and incredibly efficient, continuous sealers adapt to virtually all types of heat-sealable packaging, regardless of their thickness:
- Standard plastic bags (PE, PP).
- Complex multi-layer bags (PA-PE).
- Doypack packaging and Kraft bags.
- Aluminum-lined bags (ALU).
- Heat-sealable cardboard headers.
How does a rotary sealer work?
The continuous sealing process is a model of mechanical precision, broken down into 5 key steps inside the machine:
- Feeding: The top of the bag is inserted and gripped between two Teflon belts that isolate it and advance it automatically.
- Synchronization: The lower conveyor (which carries the weight of your product) moves at exactly the same speed as the sealing belts to prevent any stretching or tearing of the bag.
- Heating: The bag passes between two brass heating blocks. The heat and pressure melt and fuse the walls of the packaging.
- Cooling: Immediately afterward, the bag passes between two cooling blocks. This step instantly sets the seal, ensuring a perfect, smooth, and aesthetic seal.
- Ejection: The sealed bag is gently guided towards the exit by the ribbed belts.
⚙️ Technician's Tip: Speed / Temperature Ratio
The perfect quality of a continuous seal relies on a precise balance. A thick bag (like aluminum) will require a high temperature and slow movement to allow enough time to melt. Conversely, a thin bag (standard plastic) will require a lower temperature and fast movement to avoid burning. Always take the time to run a few empty tests when changing material or supplier!
Need to extract air from your packaging before sealing?
Continuous sealers hermetically seal your bags at a very high rate, but they do not create a vacuum. If your main goal is to extend the shelf life of your food products by removing oxygen, you will need to turn to specific equipment and consumables.
👉 Discover our range of professional quality Vacuum Bags.
