Fluorescent screen printing ink (on)

In the development history and growth of the screen printing industry, there have been many outstanding technological innovations that have made significant contributions to the industry, including the use of knife-cut stencils, the use of ready-to-use screen inks, and photographic printing plates. The standard language, the creation of the International Association for Screen Printing, the generation of mechanized printing, the spread of information technology required by screen printers, and the development of fluorescent inks.
Daylight-type fluorescent screen printing inks were put into use in 1984, and they were deeply impressed with their neon-like brilliance, dramatic colors, attractive attraction and artistic expression. Because its effect can be best used in the field of screen printing, it is often used in screen printing workshops. Silk screen printing is an ideal printing method for fluorescent inks because it has a uniform ink film layer that is required for the luster, stability, and wind resistance of fluorescent inks. The particle size of fluorescent ink pigments is coarser than that of conventional pigments, and the earliest term is silk screen printing.
However, in recent years, more and more fluorescent inks that can be used for fine screen printing continue to emerge. Fluorescent inks main words printing window display, decals, bumper protection, industrial insurance equipment, body advertising, letters, posters (posters), 24 inch posters, notebooks, signal flags, magazine covers, invitations, outdoor advertising, cloth Standard and so on. Due to the great difference between fluorescent inks and common ink colors, fluorescent inks play an important role in screen-printed outdoor and indoor advertising.
Fluorescent inks are luminescent materials and are substances that emit light. The substance absorbs the energy of solar radiation when it is exposed to sunlight and then stores it in the form of heat, or a photochemical reaction takes place, or the energy is emitted in the form of visible light. The absorbed radiant energy is shorter than the emitted energy wavelength. People absorb light of different colors and then emit it as fluorescence. The phenomenon of emitting light in the dark after absorbing light is called phosphorescence. The difference between the two is that the phosphor absorbs natural light or artificial light and emits light in a dark environment after the light is removed, and the fluorescent light must absorb light in the presence of light to emit light.
Fluorescent inks can also emit light in the presence of "night light" or violet light. However, it does not glow in the dark and no light. The fluorescent ink not only expresses its own color, but also has the ability to absorb light and change the light intensity so that the color it exhibits has a stronger light intensity, but the hue (or color) does not change.
Ordinary inks or dyes display colors by reflecting light, and each ink color has a different wavelength and output energy, for example, red light reflects red and absorbs other colors. The fluorescent red not only has partially reflected red, but also converts other colors (green, blue, and purple) into red wavelengths that emit as red light, so the color appears to radiate from the interior of the object. It is this luminescent property that makes the ink known as fluorescent ink. Printers use fluorescent inks for printing to obtain four times the brightness and visibility of ordinary inks. Fluorescent inks appear bright in dim light, such as at dusk and dawn.
The reflection characteristics of ordinary ink color and fluorescent ink color are different, and the unit of measurement is angstrom. Fluorescent ink converts short-wavelength light into long-wavelength light and superimposes to generate fluorescence. Through conversion and superposition, a fluorescent color with special brightness and visibility is formed.
Normally, daylight-type fluorescent colors indicate a direct lifetime in sunlight of 30 days. But now the life of the color in the room has been greatly improved. This color can be extended indefinitely indoors. It can be used to express colors and jump colors. At present, fluorescent inks have the advantages of fine background, fast drying, and ease of use for thinner ink layers. Attention should be paid to the use instructions when using them.
Fluorescent ink pigments are based on fluorescent pigments that are carefully controlled, mixed, and mixed with plastic resins under experimental control. The daylight fluorescent color is the color of the dye suspended in the colorless, transparent and insoluble resin. The resin ester is based on the powdered substance, added to the specific connecting material, carefully mixed and stirred, and the resin is In contrast, the amount of dyes only accounts for a very small proportion. However, to obtain maximum ink brightness, it is necessary to add a certain amount of dye or resin to the fluorescent color.
The use of fluorescent inks There are generally two types of fluorescent inks: oil-based and fast-drying. The ink is printed using an industry-standard screen plate, but the screen plate must have solvent resistance. For example, fast-drying fluorescent inks cannot be used for lacquer-coated blades. This is clearly explained in the User's Manual. There are many kinds of fluorescent inks with different colors in the market, and it must be clearly used before use. Each color of thinner should be used according to the manufacturer's instructions.
Daylight fluorescent colors cannot be mixed with other fluorescent colors or other types of inks because mixing may result in no longer having luminescent properties. Excessive use of diluent will reduce brightness and stability, so it must be appropriate. In indoor conditions without direct sunlight, the printed layer can maintain its effect for months. The ink can be printed using screens No. 12 or No. 14 and screens of the same nature. However, in order to carry out outdoor printing requiring relatively high durability and durability, it is necessary to use No. 8 or No. 10 mesh and a screen of the same nature for printing. Fluorescent ink printing usually uses a single-edged squeegee, either manually or mechanically.
Of course, a double-edged squeegee or a smaller pressure can be used to obtain a thicker ink film layer. The thicker the film, the stronger the anti-exposure performance. The ink can be dried by natural drying or forced drying in a dryer. (To be continued)