The use of UV fluorescent ink types is very important to the quality of packaging anti-counterfeiting effects. If the selection is inaccurate or poor, it may cause the anti-counterfeiting effect to be insignificant or not to meet any anti-counterfeiting requirements at all, such as color development according to color light In theory and light absorption principles, medium and long wavelength color light absorbs short wavelengths. The specific situation of the fluorescent ink in the actual product structure is analyzed below.
If we print colorless fluorescent blue ink on the full version of the golden yellow coating, first of all, the fluorescent blue ink layer will show blue (B) color light under the illumination of the ultraviolet lamp, and then with the undercoat layer golden yellow (Y) color light Mixing, theoretical analysis from the color light addition method, after the yellow light and the blue light are mixed, white light appears, that is, the yellow light and the blue light are complementary colors, which means that the anti-counterfeiting effect is not good or in some cases it is not seen at all To any anti-counterfeiting role. From the theory of light bottom absorption, this is because the long-range yellow light in the spectrum absorbs part of the blue short-wavelength light, so that the color that the fluorescent blue should be displayed cannot be seen. Fluorescent red works well in magazines and other situations, under standard light sources.
From this we can draw a conclusion. When choosing UV fluorescent anti-counterfeiting inks, you must be careful. In general printing systems, there are inks that produce their complementary color light or inks with longer wavelengths than the selected fluorescent ink. It is better not to use this kind of fluorescent ink or it will not achieve a certain anti-counterfeiting effect after use. Therefore, in the production process of fluorescent anti-counterfeiting inks in the pharmaceutical packaging industry, the selection of fluorescent inks for various printing primer materials in the printing system is particularly important. In addition, the use of fluorescent inks is also more strict for the printing process. Due to the particularity of its ink system, we generally need to consider the following influencing factors during use:
â‘ Since gravure printing is commonly used in pharmaceutical packaging printing process, the choice of solvent is very important in gravure printing. Solvent is an important component of gravure ink, with solubility and volatility, and its volatilization speed is an important factor that determines the drying speed and printing quality of volatile ink. The solvent volatilization rate is slow, and the reproducibility of the printed image is relatively good, but if the volatilization rate is too slow, and the volatilization on the printed matter is not complete, the fluorescent ink layer is prone to adhesion, resulting in blurred anti-counterfeit images and dirty layout Affects the anti-counterfeiting effect and the overall appearance of the product; on the contrary, if the solvent in the ink evaporates too fast during the printing process, it will cause whitening of the ink color, sticky rollers, etc., and latent hidden danger of the back adhesion of the ink layer, causing the packaging material Dirty, the bright color spots can be clearly seen in the ultraviolet light illumination F, which gives consumers an unhealthy intuition, which may affect the next coating and compounding process in severe cases.
Due to the different operating environments of printing equipment of various manufacturers, such as the speed of the printing machine, the structure of the drying system, the characteristics of the printing material, the indoor temperature and humidity, etc., must be considered, so for the solvent in the process of printing Use should consider all factors comprehensively. Generally, the dissolution parameters of the binder resin are compared. In combination with the above requirements, two or three solvents with different boiling points are used in combination to achieve the expected complete anti-counterfeiting effect pattern.
â‘¡ The proportion of fluorescent ink in the anti-counterfeiting printing plate is generally very small. Very few UV fluorescent inks can produce a large number of anti-counterfeiting products. Calculate the amount of ink reasonably, strive to run out at one time, do not leave too much to cause unnecessary waste. General fluorescent ink products cannot be reused many times for a long time. First, they are easy to get dirty and cause unnecessary problems of unclean layout. Second, after a long-term solvent flushing, the fluorescent pigments of the ink system are diluted, which greatly reduces the anti-counterfeiting effect of fluorescence, even in ultraviolet lamps. The pattern or text under the irradiation also appears dull and dull, failing to achieve the expected anti-counterfeiting effect.
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