Heat tunnels or shrink tunnels heat air around a package that is wrapped in shrink film. The heat causes the shrink film to form a tight seal around the product. Heat tunnels are usually designed with a conveyor belt to carry the product through the tunnel. Each tunnel has adjustable temperature controls.
A shrink tunnel is a heated tunnel with a conveyor system running through the tunnel. The heat settings and conveyor speed of the shrink tunnel can be adjusted to properly heat a shrink film. The heat applied to the shrink film enables the film to tightly conform to the product within the film.