Application of Fluorescent Ink in Anti-counterfeiting and Packaging Printing

As a special type of ink, fluorescent ink is mainly used in the field of anti-counterfeiting and packaging printing (such as anti-counterfeiting and packaging printing for banknotes, bank checks, stamps, cards, and high-grade cigarettes, oils, medicines, cosmetics , etc.), Gravure, offset, flexo and other printing methods. However, in recent years, with the development of more extensive, deeper, and more sophisticated research and development of fluorescent inks, fluorescent inks that can be used for fine screen printing have been continuously developed, thereby making fluorescent inks more widely used in China, such as printing liquor display boxes and properties. direction signs, bumper guard gear, industrial safety equipment, vehicle and outdoor advertising, posters, magazine covers, plexiglass display stand, invitations, standard cloth. Especially in outdoor and indoor advertising, fluorescent ink printing has the advantage that common ink book printing cannot match, and it is gradually popularized and applied in the screen printing of these advertisements. Since fluorescent ink is a kind of special ink, there are some differences between its use technology and general ink. Therefore, it is necessary to be familiar with its characteristics and various printability in order to print beautiful prints.
Fluorescent inks, also commonly known as leuco inks, are special inks that emit visible light (400 nm to 800 nm) under irradiation with a light source such as ultraviolet light (200 nm to 400 nm). The main component of the fluorescent ink is a fluorescent pigment. It is a functional luminescent pigment. The difference from ordinary pigments is that when external light (including ultraviolet light) is irradiated, it absorbs certain forms of energy and does not convert into heat energy. The photons are excited, and the absorbed energy is released in the form of visible light, resulting in fluorescence phenomena of different hue.
Different shades of light combine to form an unusually bright color, and when the light ceases to shine, the glow phenomenon disappears. This ink, which is sometimes invisible to the naked eye, emits light under ultraviolet light or infrared light, and its use has become more and more popular due to its switchable and hidden characteristics and its inability to accurately reproduce on a color copying machine. Fluorescent ink is a fluorescent pigment added to a certain proportion of polymer resin binders, fillers, stabilizers, and desiccants, and is ground or processed with an ink-making three-roll mill.
Fluorescent pigments are the main raw material for the manufacture of fluorescent inks , which can be excited by ultraviolet light to show color. According to their different molecular structures, they can be divided into inorganic fluorescent pigments and organic fluorescent pigments. Inorganic fluorescent pigments are also called ultraviolet fluorescent pigments. They are metal (zinc, chromium, etc.) sulfides or rare earth oxides and trace active agents. Calcined, five-color or light-colored, showing different colors under ultraviolet light irradiation. Its stability is good, but it is difficult to disperse in oily media, poor water resistance, there is a certain amount of wear and corrosion on the plate material. Organic fluorescent pigments, also known as daylight fluorescent pigments, are mainly synthetic resin solid solutions containing fluorescent dyes. They are made of fluorescent dyes (phosphors) that are well dispersed in transparent, brittle resin carriers. When sunlight is irradiated, emission is different from ordinary. The color of the high-brightness visible light, by appropriate blending or with a suitable amount of non-fluorescent pigments, different shades of fluorescent pigments can be obtained. Organic fluorescent pigments are characterized by easy synthesis, good dispersion in oily media, but mostly sunlight excitation, and most of the current stability is not good. In addition, there are organic rare earth fluorescent complexes, which have the advantages of simple preparation, easy refinement, dispersion in oily media, good solubility, colorlessness under visible light, strong fluorescence effect under ultraviolet light excitation, and The advantages of high stability, but the cost is high, and because the organic rare earth fluorescent complex fluorescent ink viscosity is small, can easily cause emulsification in the printing and produce dirty or ink roller deinking phenomenon, especially colorless and transparent ink, often required Check to prevent ink leakage due to deinking, so this kind of fluorescent ink is generally not suitable for lithography.
Inks or pigments display color by reflected light, but the ordinary ink color and fluorescent ink color have different reflection characteristics. Fluorescent inks convert short-wavelength light to long-wavelength light and superimpose them to produce fluorescence. By converting and superimposing, a fluorescent color with special brightness and visibility is formed. If fluorescent red has partially reflected red, and other colors (green, blue, and purple) are converted to red wavelengths to emit as red light, as if radiating from the interior of the object, printed matter using fluorescent ink can be obtained four times as much General ink brightness and visibility.
Fluorescent inks appear bright in dim light, such as at dusk and dawn.
The manufacture of fluorescent inks requires special manufacturing processes and printing processes. We know that fluorescent particles produce a range of bright and particularly clean colors such as yellow, orange, red, crystal red, green, and blue. In a dark environment, fluorescent ink emits this light. The key to this effect lies in the fact that this ink contains a special color pigment that absorbs energy in the ultraviolet region and converts this energy into longer wavelengths of visible light.

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