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Methods Of Welding PVC

16 Aug

 source: http://www.louisagreen.com/weldinfo.htm

The “V” in PVC is for Vinyl.

PVC (polyvinyl chloride) is a versatile polymer plastic that offers a strong, flexible, weather resistant, and attractive finish for fabrics used in signs, banner, tents, and transportation applications. PVC is a “thermoplastic” which means that it is highly suitable for welding. 

Be familiar with four different methods for welding PVC:

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

High Frequency Welding  After the vinyl thermoplastic molecules are excited (heated) by radio frequency waves, the materials are pressed together between a sealing bar and a bed plate.

Wedge 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.

Solvent Welding  (Room temperature.) Prior to being pressed, 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 pressed together and should be clamped for enough time for the two sides to weld.

Welding PVC Membrane
(image not part of original article)

Welding UPVC Exhaust Hood
(image not part of original article)

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