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HIGH FREQUENCY WELDING
High frequency welding is a technique for assembling thermoplastics, in particular PVC, PU and EVA films, as well as coated fabrics.
Welding two materials requires high frequency energy emitted in the form of an electromagnetic field and pressure on the surfaces.
At the molecular level, heating stirs the molecules to make them mobile and promote their binding affinity with other molecular chains.
After cooling under pressure, the bonds are fixed between the two materials to be assembled. There is no heat generated from the outside: everything happens at the heart of the material allowing a weld that is stronger than the unwelded material.
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The advantages of high frequency welding:
- Very good mechanical strength of the weld
- Air, water and gas tightness
- Realization of complex shapes
- Relatively low tooling cost
- invisible welding
- Speed of cycles
- The welds are uniform and reproducible
- non-polluting processes
- No drying/curing is required
Four important factors determine the final result: pressure, welding power, welding time and cooling time. These four parameters can be adjusted and combined in different ways to obtain an optimal result for each type of material.
Products made from these materials are flexible insulators, aseptic bags for laboratories, inflatable structures, personal protective equipment, tents, boat or truck covers, sun protection, swimming pool liners, liquid tanks, cinema screens, stretch ceilings, ventilation ducts, floating dams...