Why are the inks of uv printers four primary colors?

   Many customers who do not have a deep understanding of uv printers, especially

those who are familiar with traditional printing methods such as silk screen printing

and offset printing, do not understand the matching of CMYK four primary colors for

uv printers. Some customers will also raise the question of why the display screen

has three primary colors and why the uv ink has four primary colors. The application of

uv curing system in printing began in the United States. The main products are uv ink

and uv varnish for lithographic printing, which are applied to multi-color offset printing

machines. The resin used is acrylic oligomer. A drying system containing 6 high-power

ultraviolet mercury lamps of 80W/cm is used for printing, and the curing time is a few

seconds. Since then, uv curing systems have been widely used in offset printing,

letterpress printing, and screen printing.

   Theoretically speaking, uv printers only need three primary colors, namely cyan,

magenta and yellow, for color printing, and the color gamut that can be combined is

just like the RGB three primary colors of a display. However, due to the composition of

uv inks during the production process, the color purity will be limited. Using CMY

three primary color inks can only produce a dark brown that is close to pure black,

and black must be added to produce pure black when printing.

   Therefore, a uv printer that uses uv ink as a printing consumable must add a black

color based on the theory of three primary colors. This is why uv printing adopts

the CMYK model. In the uv printing industry, it is also called four-color. In addition,

the six-color that is often heard in the market is to add Lc and Lm to the CMYK model.

Adding these two light-colored uv inks is to meet those scenes that have higher

requirements for the color of the printed pattern, such as advertising display

materials of print. The six-color model can make the printed pattern fuller in color,

more natural in transition and distinct in layering.

   In addition, as the market has higher and higher requirements for the speed and

printing effect of uv printers, some manufacturers have also introduced more color

configurations, and made some spot colors other than six colors, but these

are still the same. The four-color and six-color models are the same.