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Resources | Shrink Tunnels

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General Questions

Setting the Shrink Tunnel Air Velocity Controls


  • The tunnel is equipped with mechanical dampers for air velocity control. The handles on the infeed end labeled “LOW, MEDIUM AND HIGH” to control the air flow into the tunnel chamber.
  • It is recommended to start out on “HIGH” and make any adjustments necessary for the particular package you are shrinking.

Application Data


Your Heat Seal sales rep may require an application data sheet and product samples for certain applications.  Please contact your Heat Seal rep for questions or concerns.

 


Gravity Turnaround Conveyor Flow Guide


Which direction to you want the finished product to go? 

This guide will help.

 


Troubleshooting

Film splits along centerfold

Film splits at hole punch


  • Check hole punch for proper alignment.
  • Check the condition of the punched holes.

Film splits at top of package


  • Check hole punch for proper alignment.
  • Check the condition of the punched holes.
  • Make sure the tunnel is functioning properly.
  • Speed up the tunnel conveyor.
  • Decrease the tunnel temperature.
  • Adjust the air flow.

Film smokes excessively


  • Check and clean wire and wire insulation
  • Check and clean knife blade
  • Check condition of sealing pads
  • Check condition of Non-stick tape
  • Check for even arm and magnet pressure
  • Check the minimum sealing temperatures
  • Increase the sealing temperatures
  • Decrease the dwell time

Film buildup on sealing wire


  • Check and clean wire, wire insulation or knife blades
  • Check the condition of the sealing pads
  • Check the Non-stick tape, change if necessary
  • Check for even arm and magnet pressure
  • Check the minimum sealing temperatures, or increase the sealing temperatures

Crows feet


  • Slow down tunnel conveyor
  • Increase the tunnel chamber temperature

Fish eyes


  • Make sure tunnel is functioning properly
  • Slow down tunnel conveyor
  • Use less film around the package
  • Increase the tunnel temperature

Angel hair


  • Check and clean wire, wire insulation or knife blades
  • Check condition of sealing pads and Non-stick tape, change if necessary
  • Check for even arm and magnet pressure, make sure the magnets release at the same time
  • Check the minimum sealing temperatures
  • Check the seal cycles is complete
  • Check the condition of the air evacuation holes
  • Increase the sealing temperatures

Dog ears


  • Use less film around the package
  • Slow down the tunnel conveyor
  • Check the condition of the air evacuation holes
  • Increase the tunnel temperature

Burn holes (Hot spots)


  • Check the condition of the air evacuation holes
  • Speed up the tunnel conveyor
  • Decrease the tunnel chamber temperature

Erratic Shrink


  • Make sure the tunnel is functioning properly
  • Slow down tunnel conveyor
  • Adjust the tunnel air flow
  • Increase tunnel chamber temperature

Severe Ballooning


  • Increase the tunnel temperature
  • Check condition/position of air evacuation holes

Off-centered seal


  • Adjust the package platform.
  • Loosen the knobs on the tension blocks.

Film won't separate; Static or film collapses package

Maintenance

Shrink Tunnel Maintenance


  • LUBRICATION OF TUNNEL BELT
  • The chain and sprockets on all Heat Seal shrink tunnels must be maintained to provide for long life and smooth operation. The tunnel chain must be lubricated after every 40 hours of operation with Heat Seal Chain Gel lubricant. (Part No. 5406-066)