Flexo printing machine has the function of printing and post-press processing. It can add flat printing, gravure printing and screen printing units to the entire unit to complete the printing, drying, hot stamping, die-cutting and curing processes. The purpose of this paper is to introduce the role of ultraviolet curing in flexographic printing and some basic knowledge of its application. Because UV curing plays a significant role in flexographic printing, it directly affects the quality of printing.
First, the application of ultraviolet light
UV is the abbreviation of Ultraviolet Rays in English, that is, ultraviolet light is invisible light, visible electromagnetic waves other than violet light, and the wavelength is in the range of 10 mm to 400 nm. Ultraviolet light is usually finely divided into the following sections according to its wavelength:
a. Vacuum UV (Vacuum UV), the wavelength is 10nm ~ 200nm;
b. Short-wave ultraviolet (UV-C) wavelengths from 200 nm to 290 nm;
c. Ultraviolet (UV-B) wavelengths from 290nm to 320nm;
d. Long-wave UV (UV-A) wavelengths from 320 nm to 400 nm;
e. Visible light, with a wavelength of 400nm to 760nm;
Ultraviolet light is used in industrial production. Long-wave UV (UV-A) is generally used.
Nm is called nanometer>, is the English nanometer abbreviation nm name, is a unit of measurement. Nanometer is one millionth of a millimeter, is also one billionth of a meter, about the equivalent length of 45 pens strung together .
Commonly used ultraviolet light spectrum diagram, see Figure 2, Figure 3, Figure 4.
Mercury lamp: The main peak is 365 nm. Mainly used for surface curing, such as printing, furniture spraying and other post-cure light source.
Xenon lamp: The main peak is 420 nm. Mainly used in screen printing, exposure, photo etching and other processes.
Iron lamp: The crest is a continuous crest. Because it has various peaks, the spectrum between 365 nm and 380 nm is enhanced, so this lamp can be used for both exposure and solidification. Most of the curing lamps used in high-speed flexographic printing presses are UV lamps for this spectrum. Under the same conditions, their UV energy is about 30% higher than that of UV high-pressure mercury lamps, which solves the problem of deep curing.
The latter two lamps are due to the different influences and changes in the spectrum of the lamp after the addition of the halide lamp.
Due to the differences in the plate material in the flexographic plate making, the cold light source tube <fluorescent lamp> has a peak between 350 nm and 450 nm, and the main peak of the cured ink is between 350 nm and 450 nm.
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