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A shrink tunnel or heat tunnel is a heated tunnel mounted over or around a conveyor system. Items (such as packaging) have shrink film loosely applied; with heat, the film shrinks to fit snugly around the wrapped object. A shrink tunnel (also commonly known as a heat tunnel) is a metallic tunnel that sits above or is built around a conveyor. The tunnel has a heating element that heats the products as they move through the machine. Your products are conveyed through the tunnel and are cloaked with loosely fitting shrink film.