Why must use UV technology? Any of the following reasons will make you unable to refuse.
Improve product performance
UV printing is very suitable for a wide range of substrates. The actual UV prints have clear dots, good tone reproduction, bright and bright ink colors, and high printing consistency. At the same time, since the UV curing process is a photochemical reaction process, both the ink layer and the varnish layer have the advantages of strong adhesion and durability, as well as water resistance, chemical corrosion resistance, wear resistance, and aging resistance.
Increase productivity
Since drying by photocuring does not require a heat source, does not contain solvents, and the curing time is very short, the general UV process can achieve a line speed of 400 meters per minute, so it can greatly improve production efficiency. After UV ink printing, UV glazing and continuous machining are carried out to obtain a printed product with high gloss and smooth and uniform surface. After the machine is glazed, the packaging processing technologies such as die cutting, creasing, gluing and bronzing can be completed immediately, which is very conducive to the needs of high-speed printing development.
Environmental protection standards
The entire curing system of UV printing is a solvent-free system, that is, 100% solvent-free formula, and does not contain VOC, which is precisely adapted to today's environmental requirements. This is another important feature of UV-curable inks. Because the solid content of UV inks is close to 100% after curing, it is almost free of VOC (organic volatiles), that is, volatile organic compounds will not or rarely emit during the curing process. It will not cause more harmful environmental pollution, and it wastes less, saves energy, and does not have to worry about handling harmful combustible and explosive materials. It is an environmentally friendly ink.
Improve economic efficiency
High production efficiency and high output mean high economic benefits. At the same time, high speed also means that the storage cost and capital pressure of raw materials and finished products can be reduced. At the same time, due to the low energy consumption of UV curing, this makes the usual operating costs also greatly reduced.
Design plate
The production of UV printed design drafts has high requirements on the output format, such as forward or reverse scanning of the film surface, the number of output screen lines, and the angle of the screen line. These must be paid attention to in the pre-press stage.
Adhesion
Due to the poor permeability of substrates such as plastic sheets or gold / silver cardboard, the UV inks have a very weak adsorption force, which will result in low printing quality and require surface treatment of the material in advance. In addition to providing bright and bright colors, UV curing inks also have strong abrasion resistance. The chemical substances in the UV ink form a polymer three-dimensional network polymer through the cross-linking reaction, so the use of UV ink can make the printed ink layer strong, quick-drying and cross-linking. Such an ink layer has high abrasion resistance And chemical resistance. Many prints printed on coated paper by uv ink for direct mail can withstand multiple foldings and can withstand strong radiation during laser printing again, so UV ink can be used for outer packaging printing that requires wear resistance.
Ink emulsification
UV inks have a very narrow water-tolerance tolerance. It is easy to cause emulsification and dirty printing during printing, which affects the printing quality. Therefore, it is necessary to reduce the printing speed appropriately, but it is still quite high compared to ordinary printing.
Curing degree
In order to improve the color saturation of the printed matter, when UV printing is performed, the printing pressure is large, the ink layer is thick, and the dot increase is serious, and the UV ink is often not easy to cure. In this way, the degree of curing must be controlled by appropriately reducing the printing speed. Because the UV ink will only dry under the irradiation of ultraviolet light, even if the ink is stored in the ink fountain for a long time, its performance can be kept stable, and there will be no skinning phenomenon on the ink roller. Moreover, once irradiated with ultraviolet light, the ink can be dried instantly and completely. Its curing time is very short, generally only 1 / 10S can be completely dried and fixed on the surface of the substrate. For traditional thermosetting inks and sheet paper For offset printing inks, the drying time may take a few minutes, or even a few days to completely dry, so the use of UV curing ink to print live parts, short delivery time, can be comparable to flexo and gravure printing, and greatly improve the production efficiency of printing .
Color sequence
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 matter to achieve the desired reproduction effect. Therefore, it is necessary to change the color sequence according to the specific situation, first print the color with a smaller ink volume, and then print the black with a larger ink volume, so that the ink volume can be maximized and the colors can be fuller.
Printing register
When UV offset printing uses UV lamp irradiation for ink curing, the main problem caused by curing is to cause the substrate to expand due to heat, 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. At this time, it is necessary to perform UV curing after the last color is printed. In this way, even if the substrate expands, 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. Or cold UV technology can be used.
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