Industrial Fan Tunnels
Belco shrink tunnels are designed and built to accept a variety of wrapped products of all shapes and sizes. Loosely wrapped products enter into the tunnel and emerge as perfectly finished shrink packages suitable for any retail level outlet or store shelf.
Built on an all welded tubular steel frame, these machines combine production proven components with modern control technology to monitor and regulate the temperature, air flow and time in the tunnel to create repeatable packages all shift long.
Belco uses Watlow microprocessor based temperature controls to maintain precise tunnel temperatures and variable speed fan controls to adjust the air flow to the top and bottom and around the package as it passes through the tunnel. The film gently balloons about the product and then tightly shrinks around the contours of the package. This produces consistent, high quality, uniformly shrink wrapped packages.
By tuning the airflow pattern around your product, Belco shrink tunnels can operate at lower, more energy efficient temperatures, run at faster production rates and make less demands on your work space.
For packaging speeds of 200,000 to 2.5 million packages per year, these Fan Style shrink tunnels are perfect complements for semi-automatic and automatic L-Sealer production lines.
- Watlow microprocessor based digital temperature control
- Variable speed fan controls to regulate air flow
- Variable speed conveyor control
- Independent Heater On/Off switch
- Direct drive conveyor motor
- Fused electrical protection
- Heavy duty locking casters and leveling pads
- Multiple Conveyor choices
- Lighted Viewing Window
- Extended Tunnel Heights
- Infeed and Exit Conveyor extensions
- Stainless Steel Construction
- 240/480 Volt 3 Phase Power
ST1808 ST2108 ST2108L ST3010 ST4016 ST6016
Configurations & Options
Main Power Switch
Variable Speed Conveyor Control
Digital Temperature Control
Insures consistent and uniform shrink quality by virtually eliminating any temperature fluctuation within the shrink tunnel. Presents a dual display read-out of both actual and set-point temperature to provide an accurate visual indication of tunnel temperature conditions. An added benefit of digital control is it minimizes setup and changeover time to further increase productivity.
Adjustable Fan Speed Controls
Belco Shrink Tunnels are built to last. You can depend on years of trouble free production. All Belco Shrink Tunnels start with the same premise… a heavy wall tubular steel welded frame. Solid... nothing to loosen up… nothing to become misaligned and cause unnecessary wear and downtime.
Heavy Duty Locking Casters and Leveling Pads
Belco Shrink Tunnels are mobile. You’ll find them easy to move from one production location to another for maximum production flexibility and productivity. Once in place, the machine leveling pads can be adjusted to match your tunnel conveyor height to the rest of your production line.
Heavy Duty Motor Drive
All Belco products are built to exacting standards with the finest materials. They are built to be rugged, durable and precise. You will achieve years of productive and profitable service from them.
E-stops Located on Tunnel Entrance and Exit
An emergency stop switch is mounted on the infeed and exit side of the tunnel control box to shut off the machine operation in an emergency situation.
Tunnel Guide Rails (fixed)
Non-adjustable, these tunnel conveyor side guide rails ensure that whatever enters the heat tunnel will exit consistently. Recommended for round or heat sensitive packages.
Teflon Curtains for Use with Shrink Poly
When Polyethylene shrink films enter or exit the tunnel, there is the possibility for hot tacking. This condition tears the plastic off the product resulting in rewraps, as well as down time due to production line contamination of the tunnel curtains. Teflon curtains minimize this problem while efficiently maintaining heat inside the shrink tunnel.
Empty Bag Blow-Off Motor with Switch
An air stream is created across the tunnel infeed to prevent empty shrink bags from entering the tunnel chamber. Recommended for all automatic sealer applications.
Automatic Tunnel Cool Down
At the end of the shift, simply turn off the tunnel Heater switch and then the tunnel Conveyor switch. The machine will begin the cool down cycle and automatically shut-off once a safe cool down temperature of 150°F is reached. A safety disconnect is included for manual shut down override.
Additional Tunnel Height (2" Increments)
Increase the tunnel chamber opening 2” at a time. This option allows for the shrink packaging of products that are taller than the standard tunnel opening.
Tunnel Infeed or Exit Extensions
The machine conveyor frame can be extended leading into and/or out of the tunnel chamber to fit your production line needs, create a work space for your operators or eliminate the need for an additional conveyor.
Stainless Steel Tunnel Guide Rails (fixed)
Stainless Steel construction is available for food applications. Non-adjustable, these tunnel conveyor side guide rails ensure that whatever enters the heat tunnel will exit consistently. Recommended for round or heat sensitive packages.
220 Volt 3 Phase
Belco can design machinery to meet customers’ power requirements. All machines are tested at their rated operating specifications before shipping to ensure a successful start-up.
440 Volt / 480 Volt 3 Phase
Requires a design change in heating elements, transformers, electrical switches and some other components. Special voltage requests are welcome. All machines are tested at their rated operating specifications before shipping to ensure a successful start-up.
*Not recommended for ST1808
Sealer/Tunnel Adjustable Spacer Set
This option ties together a Belco ILS and an ST to minimize the risk of one machine moving into or away from the other.
Tunnel Conveyor Cooling Fan
This fan system mounts to the undercarriage of the tunnel conveyor and helps cool the conveyor from building up heat which may affect the bottom shrink for some packages and films.
Product Cooling Fan
An overhead fan helps facilitate the shrink process for Polyethylene films by immediately directing room temperature air over the package after it exits the shrink tunnel. Also helps with the handling of hot packages.
For voltages other than 120 Volts, Belco machines ship without power cables and plugs. We can provide the proper power cable for the amp rating of the machine but strongly recommend following the advice of a licensed electrician for proper hook up.
Lighted Viewing Window with Lexan Shield
An unbreakable Lexan shield is mounted to the tunnel to protect the tempered glass window from inadvertent contact with operators, machinery or product.
Digital Conveyor Speed Control
This conveyor speed control provides a digital display which can be set up to read in various units of measure: feet/minute, inches/minute or even time in the tunnel chamber.
*Requires a special motor with encoder feedback capabilities.
Jam Detect Sensor
A photo-eye is mounted at the exit end of the tunnel chamber. When blocked for a determined time period, an annunciator light bar will light up to signal to the operator that product is potentially backing up into the heat chamber.
A signal can also be provided to prevent more product from entering the tunnel until the jam is cleared.
Annunciator/Alarm Light Display
A multi-colored light bar mounted on the top of the tunnel control box signals the machine condition at all times: Green signals the tunnel is ready for operation, Amber signals the tunnel is warming up, Red signals the tunnel is out of temperature or an alarm has been triggered and special attention is required.
Temperature Verification Test Port
A pair of leads from the tunnel temperature monitoring thermocouple go to the temperature control and also to this port for easy access with a calibrated meter. A milli-volt signal verifies the reading on the temperature control is within your operating specifications.
Popular Optional Configurations
Teflon Mesh Conveyor Belt
This durable, non-stick belt is ideal for very small or light weight packages and multi-packs. The design of the mesh belt allows even air flow to all surfaces of your package and is essential when your product must be transported smoothly through the tunnel. Standard mesh opening is ¼” square mesh and for polyethylene applications, use the 1/16” square mesh when needed.
This glass filled nylon, open style heavy duty rated belt is excellent for conveying very heavy products, shrinking polyethylene wrapped products or when the minimum maintenance possible is required.
3/8” diameter silicone rubber covered steel rollers transport your product through the heat chamber. As the rollers turn, your product continually moves over the rollers so there is never any imprint or mark on the bottom of your package.
Standard roller spacing is on 1-1/2” centers and Hi-density roller spacing is on 1” centers.
Lighted Viewing Window
A tempered glass window on the operator’s side of the tunnel chamber allows for faster set up and easy adjustment of controls to enhance packaging quality and productivity. Because you can observe the conditions required for a proper shrink, you can quickly adjust the temperature, conveyor speed, air flow and even air evacuation. This option has proven invaluable for customers who shrink wrap a variety of package sizes and shapes.
Belco can custom powder coat paint your machine to match your company colors or production floor requirements. Just supply your RAL paint specification along with your request for machine quote.
Stainless Steel Construction
The Belco line-up of equipment is also offered in stainless steel construction for use in Pharmaceutical, Food, Meat, Fish and Poultry processing environments. They comply with FDA and USDA requirements for packaging your product. These are wipe-down rated machines and not designed for washdown cleaning.
How to Choose
Which Belco ST is right for you?
Belco manufactures two styles of shrink tunnels to complement every level of shrink film sealer available within our industry. In fact, we are often used as an OEM partner with automatic sealer companies to complete their packaging lines for customers.
Belco tunnels will shrink all commercially available shrink films, including polyethylene, at line speeds from 5 to 150 packages per minute depending on the tunnel chosen.
For manual, semi-automatic and low speed automatic production lines, Belco offers our Fan Style Shrink Tunnels in a variety of sizes. These are often called Convection Ovens.
These Fan Style tunnels use Cal-Rod heating elements, variable speed fan motors and a Watlow digital temperature control to continuously monitor and regulate tunnel temperature. A combination of heaters and fans, positioned above and below the conveyor, moves hot air around your package as it travels through the tunnel chamber, quietly ballooning the film and then tightly shrinking to the contours of your package.
These models are rated for speeds of 5-25 packages per minute or 500,000 to 2,600,000 packages per year, single shift operation.
When the application calls for absolute shrink quality, seal control, speed or aesthetics, Belco manufactures our industry leading Recirculating Air Shrink Tunnel. These tunnels utilize Watlow micro-processor based digital temperature controls and multiple fin-strip heating elements in combination with a forced air flow design to properly deliver hot air directly to the film as your product is conveyed through the shrink chamber. You have the ability to precisely pattern the airflow to the top, sides and bottom of your package which results in the best possible shrink, even for difficult shapes.
These models are rated for speeds of 20-150 packages per minute or 2,000,000 to over 15,000,000 packages per year, single shift operation.
The first consideration is the size range of packages you need to shrink. If the package won’t comfortably fit into the tunnel opening, you can’t shrink it.
Belco tunnels are designed to balloon the film and gently shrink it around your package. This means that for lower profile packages, allow 2-3 inches of clearance between your package and the tunnel side walls. For taller packages, allow 4-6 inches or more if the package is very long. Since the ballooning is most pronounced on the top surface of the package, allow at least 4 inches clearance to pass through the tunnel, more if the package is long or the film being shrunk is Polyethylene.
Do your packages include irregularly shaped designs, windows or high profile cube boxes or cartons? Does the placement of the seal need to be underneath the face of the package for retail appeal? If so, some of your packages may require more precise and consistent air flow control to maintain the quality shrink effect you are after. Consider the Belco Recirculating Air Shrink Tunnels for these applications.
Do you require low, medium or high speed productivity without the worry of rewraps due to poor shrink quality? Consider how many packages you need to produce to meet peak demands as well as satisfy your regular production schedules. Belco has tunnel chamber lengths from two feet to eight feet long which are designed to meet your specific packaging speed requirements.
Belco tunnels can be built to include a range of standard and custom options depending on the needs of the finished package. First, choose the proper conveyor type, maybe add the Lighted Viewing Window and then determine which tunnel length will fulfill your packaging output requirements. Then, review the other options such as power based on your existing facility utilities. Belco staff will be happy to help explain other options that will complete your machine build.