Development of fluorescent screen printing ink technology

Ordinary inks or dyes display colors by reflected light, and each ink color has a different wavelength and output energy. For example, the 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 vivid and jumping 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, carefully chemically compounded, stirred and mixed with plastic resins under experimental control. The daylight fluorescent color is the color formed by the dye suspended in a colorless, transparent, insoluble resin. The resin esters are based on powdered substances and are added to specific binders with careful mixing and stirring. As shown in Figures 23 and 24. Compared with resin esters, 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.

Reprinted from: Ink Information