UV Curing is a photochemical
process by which specially formulated liquid monomers are polymerized,
or "Cure" by exposure to ultraviolet radiation.
The UV-Curable monomers
contain sensitizes that absorb UV energy which then produce very
The relative speed
of curing depending on several factors, including the chemical
formulation and thickness of the monomer, and the intensity and
spectral distribution of the ultraviolet source.
What is Ultraviolet
Light Ultraviolet radiation cover a band of wave lengths just
beyond the eye's capabilities. This Board band of the UV Spectrum
is divided into three ranges:
| Long Wave
| Mid Range
| Short Wave
in wave lengths are often made to define their application
| Ozone Production
| Black Light
| UV Curing
It shows that the curing band can encompass the complete UV
spectrum depending on the particular job that it has to do.
of UV Curing
High Productivity fast curing can be achieved at ambient temperatures
there by shortening production times and minimizing stacking.
: UV Curing
consumes only 20% of the energy needed to cure solvent-based coatings.
No Air Pollution
: UV Curable
materials are “Solvent Free” and therefore do not release
residues or gases into the environment.
Low Heat Output
ultraviolet, instead of infrared radiation is used, fragile materials
such as paper, plastic and thin films can be processed safely.
: UV Systems
are usually smaller in size than their conventional counterparts.
UV Curing Applications
New uses of UV Curing are being developed everyday. Among them
most wide used are :
There are three types of cooling systems.
Air and Water Cooling
Cooling systems for the
material to be coated can be added, for example: water plates
for the label printing machines.
Most important for the
cooling is :
cooling about 600C-900C lamp tube temperatures. If the temperature
is too high, the result is diversified ,
especially in combination with impurities.
At temperatures above
1000C the quartz soften and the lamp blows up or will bend under
it’s own weight. It is also important
to have the correct temperature at the sealing. It should not
exceed 350C. If the temperature is too high, the sealing foil
might oxidize and the lamp will lose its vacuum.
Ozone must be removed
so that the KAM-value of 0.1 PPM will not exceed. Ozone is unstable
and will disintegrate into oxygen after a few minutes.
The picture below shows the most
common type of air-cooling. The hot air above the lamp is removed
and fresh air can get the housing. Air flow should be between
30m/h – 50m/h depending on lamp Kw.