One of the major advantages of thermoplastic membranes is the ability to have their seams hot-air welded. When heated sufficiently, thermoplastic membranes change from a solid to a semi-solid state, enabling the sheets to be fused together. Thus, a monolithic (continuous) membrane is created.
Sika Roofing is the only membrane manufacturer that designs its own hot-air welding machines. For the most reliable and permanent seam welding, Sika’s authorized applicators use a Sarnamatic hot-air welder.
For smaller, hard to reach areas or for use around details, a hand-held hot-air welder is used.
How hot-air welding works:
Heated air is blown into the seam area, causing the membrane surfaces to melt. A roller and the weight of the machine then presses the two sheets of membrane in the overlap together. As the welder moves away from a given seam location, the membrane quickly cools down to ambient temperature and the heat weld is completed, providing a watertight, permanent bond. When complete, the welded seam is actually stronger than the surrounding membrane.
Sarnamatic 681 – the smart hot-air thermoplastic membrane welder
As successor to the well-proven Sarnamatic 661 SpeedWeld, the Sarnamatic 681 boasts some extraordinary features. In fact, it sets a whole new standard for reliability, safety and convenient operation.
|Wide tolerance against voltage fluctuations|
|Error messages displayed as text|
|Field replaceable parts|
|Easy to Use|
4.3" TFT color display for easy reading in daylight
|Simple menu operation|
|Compact for easy handling|
|Clear, easy-to-understand error messages|
|Welding parameters for different Sarnafil membranes are stored in memory|
|Adjustable nozzle unit for perimeter edge welding|
Adaptable to Décor Profile welding
|Vertical, free-floating nozzle and pressure wheel that automatically compensate for substrate irregularities|
|Advanced air trap for crease-free and wrinkle-free seams|
|Narrow nozzle and pressure wheel provide a consistent weld over a variety of substrates|
|Service and support are important considerations in your selection of a hot-air welding machine. Sika Roofing understands how critical it is that your equipment work correctly|
|Sika Roofing field technicians are available for training and on-site support. The interchangeable parts on the Sarnamatic 681 also allow your staff to quickly and easily service the welder on-site, minimizing worker downtime|
|In the event that your Sarnamatic 681 needs factory service, our Sarnamatic Service Department will provide quick and efficient service. Every Sarnamatic 681 carries a two year limited warranty, one of the longest in the industry|
The Handheld Hot Air Welder
A hand-held hot-air welder is used mainly for seams at details. The Triac welder comes equipped with a 40 mm and a 20 mm wide welding nozzle and a pressure roller. With a digital display of set and actual temperatures, the Triac hand-held welder provides optimum welding results.