Anti-counterfeiting technology is a door-to-door cross-cutting discipline, involving optics, chemistry, physics, electromagnetism, computer technology, spectroscopy, printing technology, packaging technology and many other fields. Ink anti-counterfeiting technology is a kind of anti-counterfeiting technology widely used in the pharmaceutical packaging industry. This kind of anti-counterfeiting technology is mainly used to add special materials in ordinary ink connecting materials, after special processing, it becomes a special printing ink technology. This type of anti-counterfeiting technology is characterized by: simple implementation, low cost, good concealment, colorful, and easy inspection. At present, there are mainly anti-counterfeiting ink UV-activated fluorescent anti-counterfeit inks, magnetic anti-counterfeit inks, thermal anti-counterfeiting inks, sunlight anti-counterfeiting anti-counterfeiting inks, optical variable security inks, pressure-sensitive anti-counterfeit inks, infrared security inks, anti-falsification anti-counterfeiting inks, anti-counterfeiting ink, etc. .
Ink printing anti-counterfeiting is an important part of the pharmaceutical packaging anti-counterfeiting technology. Experiments show that the fluorescent anti-counterfeit inks with fluorescent pigments are good in water, acid, and alcohol resistance, and are now widely used in pharmaceutical packaging, especially in blister packaging. It is also commonly used in other pharmaceutical packaging such as pharmaceutical flexible packaging and pharmaceutical labels. It can be said that fluorescent anti-counterfeiting ink is currently the most widely used in the anti-counterfeiting of pharmaceutical packaging ink - a kind of anti-counterfeit ink.
Fluorescent inks are made by adding the corresponding visible fluorescent compound to the ink. Its anti-counterfeit feature is: Under the action of visible light and ultraviolet rays, printed matter can emit glittering fluorescence. Different formulations can get different fluorescent inks. If ultraviolet ray excitation visible fluorescent compounds (such as tristyryl derivatives, stilbene derivatives, tetrastyryl derivatives, etc.) are added to the ink to obtain ultraviolet fluorescent ink, red, yellow and green light can be emitted under the irradiation of ultraviolet rays. Blue and other visible light. Infrared fluorescent ink can be obtained by adding a visible fluorescent compound having infrared excitation in the ink, and green visible light can be emitted under the irradiation of the infrared light.
Fluorescent inks are invisible and visible
(1) Invisible fluorescent ink security: Aikawa materials are invisible fluorescent inks, and the printing process is simple. The ink prints invisible patterns or text in a UV irradiation facility. A clear and bright fluorescent pattern is presented. Colorful. The anti-counterfeiting detection is convenient, as long as there is a UV light source or a money detector.
Since the invisible fluorescent ink is invisible or colorless, it is invisible to the naked eye during printing, that is, it does not have any machine-readable tracking marks. Therefore, it is more difficult to overprint, but this kind of anti-counterfeiting concealment is better, and the anti-counterfeiting force is stronger. Recently, most of domestic pharmaceutical packaging uses this invisible fluorescent ink.
(2) Tangible fluorescent ink anti-counterfeiting: The material used is a tangible fluorescent ink. The printing process is simple, the registration is accurate, and the printing effect is the same as the ordinary ink printing effect. However, under the irradiation of ultraviolet light, the printed matter exhibits abnormal light. At this time, Different from ordinary ink.
The use of fluorescent ink types is very important for the anti-counterfeiting effect of the packaging. If you choose an inaccurate or poor job, you may find that the anti-counterfeiting effect is not obvious or does not achieve any anti-counterfeiting requirements at all, for example, according to the color rendering theory and In terms of light absorption, the medium-long-wavelength color light absorbs short wavelengths. Therefore, care must be taken when choosing a fluorescent security ink. In the general printing system, when the ink that produces complementary light is present or the ink that has a longer wavelength than the selected fluorescent ink exists, the fluorescent ink is preferably not used or cannot achieve a certain anti-counterfeiting effect after use. Therefore, in the production process of fluorescent anti-counterfeiting inks used in the pharmaceutical packaging industry, the selection of fluorescent inks for a variety of different printing primer materials in the printing system is particularly important.
In addition, the use of fluorescent ink for the printing process requirements are also more stringent, due to the particularity of its ink system, generally in the use of the process we must pay attention to consider the following factors:
(1) In general, gravure printing is commonly used in the packaging and printing process of Ding Pharmaceuticals, so the choice of solvent in gravure printing is very important. Solvent is an important component of gravure ink. It has solubility and volatility. Its volatilization rate is an important factor in determining the drying speed and printing quality of volatile ink. Solvent evaporation rate is slow, and the reproducibility of the printed image is relatively good. However, if the volatilization rate is too slow, it will not completely evaporate on the printed matter, and the fluorescent ink layer will be easily adhered, resulting in the blurred image of the anti-counterfeit image, and the layout being dirty, affecting the anti-counterfeit The overall appearance of the effect and product; conversely, if the solvent in the ink is too volatile during the printing process. It will produce white whitish, sticky rollers and other phenomena. And latent ink layer hidden fault hidden back, causing the back of the packaging material from the dirty, under the ultraviolet light can clearly see the bright colored spots. This creates unhygienic intuitions for consumers and may affect downstream coating and compounding processes when severe. Because the printing equipment and operating environment of various manufacturers are different, for example, the speed of the printing press, the structure of the drying system, the characteristics of the printing materials, the temperature and the humidity in the room, etc. must all be considered, so for the printer: the solvent in the art process The use of all factors must be considered comprehensively. The dissolution parameters of the binder resin are usually compared to meet the above requirements. The use of two or three solvents with different boiling points can achieve the expected complete anti-counterfeiting effect pattern.
(2) The proportion of fluorescent ink in the security printing plate is generally very small. It can be said that very few fluorescent inks can produce a large number of anti-counterfeiting products. Therefore, when producing fluorescent ink products, it should be noted as much as possible in the order book. The amount of ink is calculated in a reasonable amount to fight for a one-time use, or to leave unnecessary waste. - General fluorescent ink products can not be reused for a long time, one is easy to get dirty, bring unnecessary layout unclean problem, the other is after long-term solvent flushing ink system fluorescent dyes dilute, making the fluorescent anti-counterfeiting effect of humans reduced, even in the ultraviolet The pattern or text under the illumination of the lamp is also dull, failing to achieve the desired anti-counterfeiting effect. This is also very important for factories and companies considering economic benefits because fluorescent inks are expensive and more than ten times more expensive than ordinary inks.