UV light in the use of two errors

 

 

    With the rapid development of the industrial economy, UV lights are also more and more extensive applications, printing and other industries as the main accessories has drawn greater attention. Is on the use of UV lamps is easy to illustrate the two errors:

 

 

    First, power density and optical energy

 

 

    1, power density is the UV light emitting long (the distance between two electrodes) 1cm in need of electricity, with W / cm said, such as: light-emitting long distance of 70cm, the electricity required for the 5.6KW words, 5600W divided by 70cm for the 80W / cm.

 

 

    2, light energy: The MJ/cm2 said that the need to measure the total light energy. Now almost all the UV ink and varnished information manufacturers are required to indicate 80W/cm Sophie several lights, irradiation distance, but it marked not only inaccurate, it is not strict. Because 3KW, 5KW, 8KW of UV light can reach different 80W/cm power UV lights, although the power density of the same, but different light energy power, so it should be said that how much light energy power is accurate. In general, the curing conditions to be met (800-1200) MJ/cm2. Also with the same kinds of power UV lamp is equipped with a reflex enclosures, the printer object from the light source distance (best distance of 15-20cm), generated by the light energy is also a lot of difference, and the selection of the power of UV light, then UV machine according to the width and products need to decide.

 

 

    Second, UV lamp cooling method is usually used forced air-cooled, this cooling method determines the size of air volume must be adequate.

 

 

    Misunderstanding here is that the temperature of the lower the better, in fact, is wrong. UV light can not be less than the surface temperature of 170 ℃, the ultraviolet energy decline, shown by the phenomenon of UV light is changed by the white-blue, ammeter shows that current increases, the time is too long will make transformers or capacitors and burned because of overload currents.

 

 

    If the UV lamp temperature too high, so that shorten the life span of UV light, showing the phenomenon as follows: tube expansion deformation, there白雾such as substrates because the temperature is too high and directly affected, and even a reflection of the reflective aluminum melting deformation. (Reflective aluminum melting point of 500 ℃)

 

 

    In short, the size of fan air volume by UV machine UV light box the size and power, the number of decisions. Air volume must be able to control the lamp surface temperature 200 ℃ is better, and do not use strong wind blowing directly hit tube surface