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U.S. Bellows U.S. BELLOWS, INC.
FABRIC EXPANSION JOINT CATALOG
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Fluoroplastic Belt Splice, Single Ply Splice

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Single Ply Splice Instructions

Download Instructions [PDF]

U.S. Bellows highly recommends that a test splice be performed prior to actual splice.

Thank you for purchasing FLEXXCEL Fabric Expansion Joint material. Prior to performing the actual splice on your expansion joint, please complete a U.S. Bellows Test Splice. Refer to the U.S. Bellows Test Splice instructions for details.

Safety Precautions

Experience has shown fluoropolymers can be processed and used at elevated temperatures without hazard if proper ventilation is used. Make certain all heat sealing is performed in well ventilated areas. Make certain the heat sealer is safely handled during use. The heat sealer temperature will reach 725F in normal operation. Special care must be taken with the heat sealer during handling due to the high temperature.

Equipment Required to Splice FLEXXCEL materials

Equipment required to splice FLEXXCEL materials:

  1. Heat Seal Iron
  2. Backer Board
  3. FLEXXCEL belting material
  4. PFA heat sealing film
  5. ensureAsplice product
  6. Stapler*
  7. Scissors*
  8. Blade Knife*
  9. Tape Measurer*
  10. Marking Pen*

*These items are not included in the kit.

Heat Seal Iron Operation

To operate the Heat Seal Iron, follow these instructions:

  1. Plug the unit into an electrical outlet.
  2. Place the Heat Seal Iron on the FLEXXCEL Backer Board or another insulated surface.
  3. Push the toggle switch up to the "on" position.
  4. Set the temperature by turning the dial to the desired temperature. A temperature range of 700°-740°F (370°-385°C) is typical for splicing U.S. Bellows FLEXXCEL materials.
  5. If ambient conditions are ideal, each splice section should take approximately 5 minutes.

The unit contains two lights, a "heat up" light and a "ready" light. The "heat up" light will remain lit until the unit reaches the set temperature, at which point the "ready" light will go on.

HT Composite Belt Splice

Install the FLEXXCEL belt material per the BELT INSTALLATION INSTRUCTIONS. Heat Seal Splice should be performed prior to last back-up-bars being installed.

  • Place backer board under belt
  • Overlap belt ends
  • Mark belt to allow 3" overlap
  • Trim excess belt
  • Trim PFA Film to proper width
  • Staple PFA film between belt plies
  • HT Composite Belt Layers

    HT Composite Belt Splice

    Make sure the heat sealer has reached the temperature of 700°-740°F before using. (Green light on) Place iron at edge of belt to begin splice. Apply pressure to handles of iron. Leave iron on splice area for 5 minutes.* Depending on width of belt, it may be necessary to perform multiple splices across the width of the belt. Step iron cross width of belt, overlapping each splice 1/2".

    HT Composite Belt Layers

    HT Composite Belt Splice

    After each section of the splice is complete, press/rub the completed spliced area with a wooden block— or the end of a wooden hammer handle. There will be a noticeable change of color on the belt after rubbing. This process will help spread the melted PFA material evenly.


    HT Composite Belt Splice

    When the heat seal is complete, remove the sealer and place on the backer board to cool. Allow the splice to cool to ambient temperature before further handling the belt.


    HT Composite Belt Splice

    When entire splice is complete, clamp the back up bars into place and drill remaining holes in the belt. Bolt the back up bars into place. Expansion joint splice and installation is complete.

    HT Composite Belt Layers
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