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12/18 HANDcure
Description of the UV-Technique
EN/
2 DESCRIPTION OF THE UV-TECHNIQUE
2.1 Process of UV-Drying
Principle UV crosslinking is a chemical process. The action of UV light
cross-links the liquid constituents of the binder.
We refer to this as polymerization and thus curing.
2.2 UV-Radiation
Electromagnetic Radiation Visible light at wavelengths between 380 nm and 780 nm
represents just a fraction of potential electromagnetic rays.
Light at wavelengths greater than 380 nm is perceived as blue
to violet. The human eye is unable to perceive the radiation of
wavelengths in the ultraviolet range, which is even shorter.
Generation of UV radiation
by UV LEDs
LEDs are based on semiconductor connections which convert
the current directly into light. If current ows through an
LED in the forward direction, it emits energy in the form of
light. Each LED can only give off light in a narrow spectral
range depending on the material used for the semiconductor
component. Typical LED systems work in the wavelength range
from 365 nm.
Hazard from UV radiation Natural UV radiation causes skin cells to change (tan),
ultimately developing sunburn. Articially generated UV-
radiation, however, is much more intensive than the sun’s
radiation to earth, creating a hazard to eyes, lips and skin, in
particular.
UVA rays may lead to irritation of sensitive mucous membranes
in the eye and under certain circumstances, also to skin
irritation.
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