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How to use Keder?

Keder is made of two components: a core and fabric. The core is an extruded PVC, or another elastic material, which gives flexibility to the entire unit. The core is wrapped and welded in single side PVC coated fabric, the non coated side allow the Keder to easily slide into an extrusion with a luff groove – keder rail.

Keder Illustration
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HF Welding

High frequency welding (often abbreviated HF welding or RF welding) is a manufacturing process where two thermoplastic (PVC or TPU) coated fabrics are welded together using an electromagnetic field. The weld is much stronger, compared to other technologies, such as hot air, hot wedge or impulse welding. The resulting weld is also airtight and waterproof.

Using a high frequency electromagnetic field, the fabric is heated and pressure added to melt and fuse the two materials together. No outside heart is applied. Instead the heat is generated within the materials.

Hot Air Welding

Hot air welding uses heated air through a nozzle to melt the mating surfaces of the two materials to join. Pressure applied from a system of rollers — or manually, in certain cases — combines with the heat to form an extremely strong bond. The heated air is directed to the material surface just as it passes between a roller, press or clamp, so the materials are held in tight contact for fusing and cooling.

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Keder Rails are aluminum extruded profiles. As per the application, they are manufactured in different profiles to allow keder edge to slide in to secure the fabric panel. These profiles help in designing the structure with minimum screwing and a reliable setup. Keders are chosen smaller to the size of the keder rail.

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