Many health and environmental protection requirements and constraints. Especially for food packaging prints, due to the use of organic solvent-based inks and varnish, hydrocarbons are emitted, air is contaminated, and health is impaired. Therefore, food packaging printing in developed countries has basically no longer used solvent-based printing. Ink materials. Research and development and application of small pollution, pollution, and pollution-free green packaging and printing materials have become an inevitable requirement for the development of green packaging.
In the packaging prints, it can be said that the ink has a great influence on the environment. In addition to the trace elements of toxic elements such as lead, chromium, and chlorine in the ink, the ink is the most volatile organic solvent (xylene, toluene, ether, etc.). ) When used in food packaging and printing, the harmful components of the ink will directly harm the health of the consumer. At present, due to the increasingly stringent requirements for environmental protection all over the world, ink products have been subjected to the impact of green production (clean production) and the concept of green products, and various green packaging and printing inks have attracted more and more attention. Water-based ink as a new type of green packaging printing material, its biggest advantage is the absence of volatile organic solvents, its use reduces the amount of organic volatiles (voc), will not harm the health of ink manufacturers and printing operators, improve Environmental quality. At the same time, water-based inks do not have some toxic and harmful substances in solvent-based inks that remain in printed matter, and have excellent characteristics that are non-toxic, non-irritating, and non-corrosive, and do not cause pollution to packaged goods. Can be widely used in sanitary packaging requirements strict packaging.
Born in 1946, the trial was successful in 1969, and it began to be used in the production of ultraviolet drying ink in 1971. After years of research, development and improvement, it has achieved major breakthroughs and development in recent years, and has become a more mature ink technology. UV curing ink (uV ink) The entire curing system is a solvent-free system, almost 100% solvent-free formula, eliminating the erosion of VOC volatile organic substances on the printed matter and damage to the human body, avoiding environmental pollution, is considered to be pollution The environmental protection packaging EB, ~U materials with almost no emissions are known as energy-saving and environment-friendly green products. uV inks are widely used for flexo printing and offset printing, and can be used for food, beverages, alcohol and tobacco, pharmaceuticals and other sanitary conditions. The demand for high-quality packaging prints.The annual growth rate of more than 10% in the world, far exceeds the development of general printing inks.The electronic ink curing ink is an ink that can rapidly change from a liquid state to a solid state under the irradiation of a high-energy electron beam. EB ink, also known as EB ink, is a new type of environment-friendly ink developed in recent years.Electron beam curing (EB) enables users to produce high-value-added products at a lower cost, with low energy consumption, high production speed, and operation. The cost is low, and there is no need for solvents that do not pollute the environment.As early as in the 1980s, foreign countries have developed and applied them. In recent years, the domestic printing industry has also begun to apply.
In addition, glazing is one of the surface processing technologies for packaging prints. In the packaging printing, with the development of the light on the connecting line, the coating has become very common, and the coating has become almost an indispensable processing procedure. From the perspective of environmental protection, the use of oily glazing will be reduced, while waterborne glazing and uV glazing will increase. Waterborne varnish is a green printing material developed at home and abroad in recent years. It completely abandons the toxic substances in varnish coating and uses water as a solvent, which has extremely high environmental protection value. Modern new waterborne varnish is a green material that meets the requirements of hygienic and environmental protection, and is widely used in the packaging of food, medicine and other products. In addition, uV varnish is also recognized as an energy-saving and environment-friendly product in the world, and it is also currently in China. We are stepping up research and application of new green packaging materials.
3 Improve the printing effect
As a packaging and printing product, its final printing effect is crucial. In the packaging printing design, the choice of printing materials must focus on improving the printing quality. From the point of view of printing materials, the relational printing effect also mainly relates to printing materials such as paper and ink materials.
There are many kinds of printing materials such as paper. In order to ensure a good printing effect, we must first consider the issue of cooperation with different printing methods, and secondly, consider the printability of various printing materials. From the printing process point of view. The effect of color reproduction of printed materials is influenced by many factors such as mechanical equipment, process operations, various raw materials, etc. Among them, the printability of materials has the greatest influence on the effect of color reproduction. For example, different papers, even if printed using the same ink, may exhibit a great difference in color. The printability of paper includes whiteness, smoothness, ink absorption, stretchability, and the like of the paper. The whiteness of paper is an important indicator of the correct color. It is closely related to the vividness of the reproduction color. The smoothness of the paper is an important factor that determines the quality of the reproduction of the printed matter. In terms of offset printing, paper with high smoothness is When printing, it can contact the blanket with the largest contact area, complete the ink transfer evenly and completely, and the dot reproduction is clear and sufficient.
The cost of the ink needed to print a packaged print is minimal, but it affects the quality of the finished product. There is no need for strict selection of ink for printing ordinary products, but when printing special products, the choice of ink should be careful. For example, samples of good-quality merchandise, commercials, etc. should be printed with good quality ink. In addition, for special-purpose printed matter, appropriate printing inks should be used, for example, packaging for food, cosmetics, children's toys, etc. Lead-free ink should be used to avoid poisoning; printing inks for containers or packaging products should not be difficult. Wear and adhesion characteristics.
Correctly selecting and controlling the printability of inks is of great significance for improving the quality of packaging and printing products and pursuing perfect packaging prints. Care should be taken to select and adjust the printability of the ink, making it suitable for the requirements of the printing process and printing materials, so as to improve the printing quality of the product, reduce production costs, and increase economic efficiency. The printability of the ink mainly includes the rheology, thixotropy, viscosity, fluidity, permeability, transferability, color and the like of the ink. When the ink has a good thixotropy, the printing process is conducive to the smooth and even transfer of the ink. At the same time, once printed on the paper, the ink is thickened by thinning to ensure the clarity of the print, especially for dots, text, and lines. Printing can prevent the ink from infiltrating and spreading on the paper; when the viscosity of the ink is too large. Strong drawing. It is easy to form a layer phenomenon in printing, and it is more obvious in high-speed printing, which can easily cause the phenomena of de-powdering, shornness or separation of the paper, which may make it difficult to transfer the ink. If the viscosity of the ink is too small and the fluidity is increased, it will also cause the printed matter to be dirty, the print area will be enlarged, and the sharpness will be reduced. The accuracy and vividness of the hue of the print will be determined by the color of the ink. In color printing, the color of the ink is related. Whether the hue and hue level of the printed copy meets the requirements of the original, and the print color is inaccurate, which will affect the product quality. In addition, in addition to selecting and controlling the printing activity of the ink, the light and heat resistance of the ink should also be given sufficient attention in the packaging printing design. The lightfastness and heat resistance of the ink means that the ink layer on the surface of the printed matter is exposed to the light source and maintains the property of discoloration relatively within a certain humidity range. It is the inherent chemical property of the ink. The light resistance of the ink after mixing and diluting (adding black and white ink) is greatly reduced and it is easy to fade after printing. This is also the reason why many pale colors fade easily in spot color printing. At present, there are fading problems in the light background color of some packaging and printing products, which greatly affects the use of packaging and printing products. Therefore, the rational use of the lightfastness of ink is very important for improving the quality of packaging and printing products.
Reprinted from: Design Online
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