For UV offset printing to work better, the main problems to be solved are as follows: 1. Design and plate making The design format of the UV-printed design draft must be determined according to the work order, such as forward or reverse scanning of the film surface, the number of output lines, and the angle of the line. Some special prints have high requirements. For example, the resolution of 3D printing is very high. The angle of the screen must be matched with the printing material to avoid hitting the screen. Transparent plastic sheets and aluminized paper often need to be printed with white ink. Pay attention to the impact of the expansion and contraction of the printed material , Through the correction of film in advance to achieve the best quality. 2. Adhesion Due to the poor permeability of substrates such as plastic sheets or gold and silver cardboard, the ink's adsorption force is very weak. Even if UV ink is used for printing, the ink adhesion is poor and the printing quality is not high. It can be solved by surface treatment of the material. 3. Ink emulsification UV inks have a very narrow balance of water and ink balance, which can easily cause emulsification and dirty printing, which can affect the quality of printing. Solution: Reduce the printing speed and control the printing speed to 5000-8000 prints / hour. 4. Degree of curing In order to improve the color saturation of printed products, when UV printing is performed on the surface of substrates such as plastic sheets, the printing pressure is large, the ink layer is thick, and the dots increase seriously, which makes the ink not easy to cure. In order to ensure the printing quality, the printing pressure cannot be adjusted greatly. Solution: First, reduce the printing speed moderately and increase the UV lamp irradiation time to allow the ink to completely cure; secondly, adjust the distance between the UV lamp tube and the substrate, increase the UV light irradiation intensity, and cure the ink. The effective wavelength range of UV curing is 200-400nm, and the wavelength of some light sources in the printing workshop is also in this range, which will cause the surface layer of the ink to be slightly cured, so attention should be paid to the influence of ambient light on the UV ink. 5. Color sequence arrangement The problem of UV offset color sequence arrangement is more complicated. Due to the limitation of the inking principle, the ink layer on the substrate is relatively thin. When a thicker ink layer is required, it is difficult for the printed product to achieve the desired reproduction effect. For example, in four-color overprinting, the commonly used printing color sequence is black, cyan, magenta, and yellow. Because black occupies almost all the space, cyan, magenta, and yellow have lower inking power, and the total ink amount is not enough. The color is not saturated. The solution is to change the color sequence, first print the color with the smaller ink volume, and finally print the black with the larger ink volume, so that the ink can reach the highest and the color is more full. 6. Printing register UV offset printing uses UV lamp irradiation to cure the ink. The main problem caused by curing is that the substrate is thermally expanded, resulting in inaccurate overprinting. This is in contradiction with UV ink curing, because ink curing requires a longer UV lamp irradiation time, while printing sleeve guidelines require a shorter UV lamp irradiation time. Solution: UV curing is done after the last color is printed. At this time, even if the substrate is swollen, the temperature of the substrate can be reduced by placing it for a period of time to minimize the deformation of the substrate. In special cases, the middle color group can also be irradiated with a UV lamp, but the shorter the irradiation time, the better.
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