Ashrink tunnel orheat tunnel is a heated tunnel mounted over or around aconveyor system. Items (such aspackaging) haveshrink film loosely applied; with heat, the film shrinks to fit snugly around the wrapped object.[1]
Several types of shrink tunnels are available.[3][4][5] The heat source can be based onheating element (electrical resistance),infrared heater, steam, or gas flame. Oftenforced air is used to improveconvection, sometimes focusing the heat on one component of the item.
Tunnels are available with or without a conveyor system. Some are built into a production line or are integral with machinery that also applies the shrink film. Others are movable by hand or by castors. A shrink tunnel, referred to as an oven, may be equipped with an integrated conveyor of two different kinds: theroller conveyor or thebelt conveyor. Roller conveyors can be used withpolyolefin,PVC, and shrinkpolyethylene films. The space in between the rollers is filled with hot air from the bottom of the tunnel to shrink the film layer around the object, creating a sealed package. When used with polyolefin and PVC based films the rollers are called "live" or spinning. When used with polyethylene films the rollers are called "dead" or not spinning. The tunnels withTeflon mesh belts andpolymer mesh belts are used for smaller packages, or when the package may have an instability and need a stable platform.
Some heat shrink tunnels have two or more zones for heating and controlled cooling.
