UV Printing Card

1, UV concept of
UV is ultraviolet English (Ultra-Violet Ray) stands for industrial use UV light source spectral range 200nm-450nm, according to band is divided into:
UV A :320-400nm
UV B :290-320nm
UV C :200-290nm
UV V: 390nm or more
In general, UV is not specifically used in offset printing, it is a kind of UV light exposure to chemicals, while the chemicals were contained in the dirt, "KPS only agent (Photoinitiator)" by UV light stimulation, in a very short period of time (less than 1 second) so that the chemicals contained in the "monomer (Polymer)" generate glue hardened "radiation hardened technology (Radiation Curing)", commonly referred to as UV curing (UV Curing0. the international community has will be with the "electron beam curing technology (Electronic Beam Curing)" attributable to the same, collectively known as UV / EBCuring. UV curing may be used in a variety of traditional print layout, including letterpress, flexible letterpress (Flexo), lithography, screen printing, etc. , as long as the use of UV inks, with UV light to complete the main part. lithographic offset printing UV printing that is, the structure, the use of UV inks, made with the UV light source, of course, some very important conditions should also reach a square with can be. In addition to printing, the use of transparent materials, printing materials for UV coating on the market is also a widely used means of polishing.

2, UV curing
UV-curing said UV Curing in English or UV Coating, UV curing is a photochemical reaction, namely, UV irradiation may be curable liquid material through the print or coating to the substrate or workpiece surface by UV light exposure to achieve the hardening process, UV curing and the similar to the traditional drying process, but the principle is different from the traditional dry coating materials in general by means of solvent evaporation and the formation of hardened, while the UV-curing cross-linking had no solvent evaporation.

3, UV light
UV lamps for gas discharge lamps, gas discharge lamp is divided into arc discharge and glow discharge. Arc discharge lamp, its working principle is: in a vacuum quartz tube by adding quantitative high-purity mercury (mercury), through the electrodes at both ends to provide voltage difference (voltage drop), the resulting plasma discharge, resulting in ultraviolet radiation. Arc discharge lamp generally issued by the high temperature, ultraviolet light, commonly known as thermo-optic UV. Glow discharge lamp, its working principle is: in a vacuum fluorescent tubes inner wall coating evenly thin coating containing mercury components, through the ends of electrodes to provide voltage difference (voltage drop), the resulting plasma discharge, resulting in ultraviolet radiation. Glow discharge lamp generally issued by the ultraviolet light at lower temperatures, commonly known as UV luminescence.

4, UV light intensity
UV light intensity depends on the UV lamp power density, commonly used specifications are:
40W / cm that is 100W/inch
60W / cm that is 1500W/inch
80W / cm that is 200W/inch
120W / cm that is 300W/inch
160W / cm that is 400W/inch
240W / cm that is 600W/inch
1000W / cm that is 2500W/inch
2000W / cm that is 5000W/inch

5, UV lamp selection
First, locate the necessary power density and the required curing width, calculated as follows: complete UV lamp power (w) = Power (w / cm) * curing width (cm)

6, UV lamps selection of components
UV lamp to ensure that the good work normally required to ensure that the following elements:
A. Choose matching lamps Power: The complete magnetic leakage transformer / capacitors required with the UV lamp voltage / current line, magnetic flux leakage transformer rated power / secondary voltage / working current / insulation coefficient / pressure level and the capacity of capacitors / pressure / discharge times can be washed directly to determine the UV lamp light-emitting efficiency / stability and life;
B. Adapter fan to coincide with the UV lamp power: exhaust volume = 150 cubic meters / hour. KW * UV lamp power (KW). Note: can not use a strong wind blowing on the surface of the cooling tubes, or tube surface temperature is too low will cause the lamp lights interrupter.
C. select the appropriate reflector: the market of custom and standard on the UV lamp shades are generally divided into the spotlight hood and parallel light shade.