The UV polymerization technique is based on the fact that some liquids, monomers and certain synthetic resins can polymerize (cure) with a so called photo initiator under the influence of UV light. The formula consists of certain auxiliary materials that are necessary for obtaining the desired properties in the end product.

UV Light
Ultraviolet light is the part of the light that is located in the wavelength area between 180 nm (nanometer) and 380 nm. With regard to the effects of UV light on human beings and the environment a distinction is being made between UV-A (long-wave UV), UV-B and UV-C (short-wave UV).

> UVA: 315 - 380 nm
> UVB: 280 - 315 nm
> UVC: 180 - 280 nm

After 380 nm the visible part of the spectrum commences, then the infrared light, followed by micro radiation and radio radiation.

Cold or warm light?
In UV curing there is a difference between cold and warm UV light sources.

When using a cold UV light source, also known as Flash cure system, the UV energy otherwise generated in 1 second for example, is now being radiated in only 2 milliseconds. Due to this just as many photons are being radiated, but the substrate will get no time to warm up, hence we can also work with temperature-sensitive substrates.

A new UV lamp is the UV LED (UV light-emitting diodes) for applications, where a small surface has to be exposed to cold light. The very long life span of this light source, up to 50,000 hours, is an additional advantage of this new UV lamp.

In some cases the warmth to be generated (continuously burning lamp) is quite important in the production process and therefore Parvus supplies 4 types of UV units:

  • CR = continuous radiation - continuously burning UV light
  • FD = flash on demand - UV flash light 1 Hz
  • SF = stroboscopic flash - UV flash light 50-100 Hz
  • LED = light-emitting diodes - cold UV light, up to 50,000 burning hours