Shrink tunnel - Heanjia Super-metals Co., Ltd.

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Shrink tunnel

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.

Features of shrink tunnel are as follow:

- Insulation layer between heating zone and outer skin of about 100mm to minimize heat loss.
- Super cool tunnel outer wall.
- With one 750W fan motor, motor speed can be controlled by "Omron" frequency inverter.
- Adopt long metal heater, durable and stable.
- Heater drawer design, for easy inspection and heater connection changing.
- Thermal circulation system using heat integrated design, rapid temperature raise up
- In One heating zone, controlled by SSR and PID "Omron" temperature controller, temperature tolerance ±1 Celsius.
- Standard live roller design.
- Adjustable air flow vents control the air flow volume by a "Omron" frequency inverter.
- Both side lateral air flow direction is Adjustable.
- Conveyor motor 400W, controlled by a “Omron” frequency inverter, speed adjustable 10-40 m/min. capability up to 150 pcs/min. for the 240mm length product.

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. The roller conveyor or the belt conveyor. Roller conveyors can be used with polyolefin, PVC, and shrink polyethylene 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 with Teflon mesh belts and polymer mesh belts are used for smaller packages, or when the package may have an instability and need a stable platform.

Shrink tunnel is widely applied to the shrink package of foodstuff, beverage, pharmaceuticals, audiovisual products, hardware, cosmetics, books, toys, plastic, electronic components and so on. Especially for the shrink package of PE shrink film, (use alone, work with Auto Sleeve Packager or L Bar Sealer).

Application:

-Shrink labels.

-Tamper resistant or Tamper-evident bands or seals.

-Form large unit loads for transport.

-Combining small items for sale and display (example: bottled water).

-Form primary barrier on foods such as cheese, meats and fish.

-Skin packs.

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