LED UV Technical Requirement for Offset Press Printing
Since the UV LED curing technology show up, the LED UV offset press is becoming more and more polular these years. But it also have many professtional technical requirement for printing operations.
1.Color sequence arrangement
In the color arrangement,LED UV offset printing is more complex.Because of different color, the ultraviolet photon absorption also exist great differences, and in the drying speed, different ink is not the same.According to the different colors of different UV absorption, ink permeability is the best followed by magenta, yellow ink, green ink and black ink.In physics, the total absorption spectrum is black ink, the total reflection spectrum is white ink.These have an important effect on the absorption of UV light by photosensitizers, which in turn have an effect on the drying rate.Therefore, in the color arrangement should be white, black, blue, yellow, magenta ink, so that can make the light transmission of ink as much as possible to absorb light, thereby enhancing the curing effect.In the 1 color or 2 color printing, such a color arrangement effect is very prominent.Because such a color arrangement can give black ink, white ink to increase the light curing opportunities, thereby enhancing the drying effect.This sort of color arrangement is very reasonable in multicolor presses with multiple sets of UV lamp drying devices.In the Pantone Color printing, firstly to print the lines or text version as well as small-size and dark-color solid plate, then go to print the large-size solid plate. This arrangement can make the ink drafting reach the highest and the color get very full.
For the use of alcohol dampening device multi-color offset press, use LED UV water bucket solution to replace the original water bucket liquid , but keep the alcohol unchanged.In monochrome offset printing, you can add some alcohol in the bucket fluid to reduce the ink emulsion, so that the ink surface tension could be reduced and improve the drying rate.Use the special LED UV car wash water for cleaning.
As the UV LED ink and LED UV car wash water has a strong corrosive, and ordinary PS plate is with low corrosion resistance and poor printing resistance, so we suggest you to use a special LED-UV PS plate.