Technology
High
Frequency Welding
High
frequency welding method is usually often applied whenever
PVC
and PU products have to be welded.
Common
products manufactured with HF welding method are
stationery,
toys, packing, tents, pool, automobile parts, shoes,
medical
products, etc.
Principle
and advantages
The
main principle of high frequency welding is based on dielectric heating
of the material to be welded.
The
sheets of material are put between two metal plates (the electrodes),
whereupon a high frequency
voltage
is connected to the plates.
As
a result, the molecules in the material start vibrating, which results
in heating up
to
the melting (fusing) temperature.
By
bringing two layers of material into the HF field at the same time and
pressing them together,
the
layers melt together and form a strong welded joint.
The
great advantage of HF welding is the speed of welding
In
comparison with high frequency, in all other kinds of welding methods
(with
filaments, hot air or infrared radiation) the heat has to be added from
the outside.
It means the heat must first penetrate the material in order to make it
plastic enough to form a weld.
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