A shrink tunnel is a machine used in packaging that uses heat to shrink heat-sensitive plastic films tightly around a product. It consists of an enclosed space with a conveyor belt that moves products through it, and it is controlled by a system that regulates the temperature and the conveyor's speed to ensure proper shrinking. This process creates a secure, professional-looking, and often tamper-evident package. 

How it works

• Products, already loosely wrapped in heat-shrinkable film, are placed on the conveyor belt at the tunnel's entrance.
• As the products travel through the tunnel, heaters apply heat, which activates the film's properties and causes it to contract.
• The heat can be applied using forced air, infrared, or steam, depending on the tunnel type.
• The conveyor belt's speed and the heat settings are adjustable, allowing for control over the dwell time and the amount of heat applied to ensure a consistent shrink without damaging the product or film.
• The result is a tight, secure, and professional-looking package that adheres firmly to the product. 

Key components

• Heater bank: The primary component that generates heat to shrink the film.
• Blower motors: Circulate the heat from the heaters to ensure even temperature distribution throughout the tunnel.
• Conveyor system: A conveyor belt that transports the products through the heated tunnel. Its speed can be adjusted to control the dwell time.
• Control panel: Allows the operator to set and adjust the temperature and conveyor speed.