Functional Principle | Steam Shrink Tunnel
The working principle of a steam shrink tunnel is primarily based on the thermal shrinkage of steam and is widely used in the packaging industry. The basic process is as follows:
1. Heating and Generating Steam: The steam shrink tunnel is equipped with heaters that heat a water source to generate high-temperature steam.
2. Steam Circulation: The generated steam circulates within the tunnel, evenly distributed through fans or natural convection, ensuring uniform temperature and humidity inside the chamber.
3. Shrinking the Packaging Material: When the packaging material (such as shrink film) passes through the tunnel, the heat from the steam causes the film to expand, and upon reaching a certain temperature, the film begins to shrink.
4. Cooling and Setting: After shrinking, the packaging material quickly passes through a cooling section, usually involving cold air or water cooling, to solidify the shrink film while maintaining its shape and sealing properties.
5. Exhaust: After a certain period, the steam inside the tunnel is discharged to maintain a suitable working environment.
The advantages of a steam shrink tunnel include its ability to effectively shrink film materials, adaptability to various product shapes, and the capability to achieve high production speeds.
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