Louis A Green Corp                                (800) 225-3577

Welding PVC-Coated
Fabrics and Webbing
The "V" in PVC is for Vinyl.

PVC (polyvinyl chloride) is a versatile polymeric plastic that offers a strong, flexible, weather resistant, and attractive finish for fabrics used in signs, banners, tents, transportation, and many other applications. PVC is a "thermoplastic" which means that it is highly suitable for welding.

The primary reason to have welding equipment is to be able to join panels using overlapped or butt seams. In these cases, one sheet of vinyl-coated fabric is being welded to another piece of the same type of fabric.

Because Weldable Webbing is also PVC-coated, the same welding equipment can be used to add strength by welding the webbing to various vinyl fabrics, thus joining two fabrics with differing internal fabric weaves ("scrims") but with compatible outer PVC surfaces. (PVC-Coated Weldable Webbing can also be stitched or, for light signs and banners, it can be applied using double-sided banner tape.) 

Be familiar with four different methods for welding PVC:

Hot Air Welding   Electronic Welding
Air heated to over 400o F is directed through a nozzle precisely into the space between the fabrics to be joined. The heated surfaces are then pressed together by a roller which follows the nozzle.

Hot Air Equipment Suppliers:

Production-Scale Machines:
Miller Weldmaster

Smaller Shop Tools:
Forsthoff  (Abbeon Cal)
  Thermoplastic vinyl molecules are excited (heated) by radio frequency waves or electronic pulses. The materials are pressed together between a sealing bar and a bed plate.

High Frequency Equipment Suppliers:

Hall Dielectric
JTE Machine Systems

Impulse Welding
Wedge Welding   Solvent Welding
Fabrics pass between spaces above and below a heated metal wedge as it is moved along the materials to be joined. The resulting heated materials are then pressed together by a trailing roller.

Wedge Equipment Suppliers:

Miller Weldmaster


Sinclair Equipment

  (Room temperature.) Prior to being pressed together, a chemical solvent is spread along the surfaces to be joined. After a brief waiting period during which the solvent has time to soften the vinyl coatings, the materials are joined with pressure. Materials should be clamped for enough time for the two sides to weld.

Fabric Adhesive Suppliers:

Adhesive Engineering & Supply
Chemical Concepts
H&H (Snyder Vinyl)

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