Analysis on the Principles of Printing Color Sequence Selection

1, according to the three primary colors arranged color sequence

The brightness of the three primary colors of ink is reflected on the spectrophotometric curve of the three primary color inks. The higher the reflectance, the higher the brightness of the ink. Therefore, the brightness of three primary colors of ink is yellow> cyan> magenta> black. The small first printing, the bright printing.

2. According to the transparency and hiding power of the three primary inks

The transparency and hiding power of the ink depends on the difference in the refractive index of the pigment and the binder. The ink with high hiding power has a greater influence on the color after the color stacking. As the overprinting of the printing ink, the correct color cannot be displayed and the good color mixing effect cannot be achieved. Therefore, the ink with poor transparency is printed first, and the transparency is strong.

3, according to the size of the dot area arranged color sequence

In general, the area with small area is printed first, and the area with large area is printed.

4, according to the characteristics of the original arrangement of color sequence

Each manuscript has different characteristics, some of which are warm and some are cool. In color sequence arrangement, the color sequence mainly based on warm color is black, cyan, magenta and yellow; the color sequence mainly based on cold color is black, magenta, cyan and yellow.

5, according to different arrangements of printing equipment color sequence

(1) Monochromatic machine color sequence: When the monocolor machine prints multicolor products, the ink transfer is wet stacking. When considering the color sequence, the ink viscosity can be placed in a secondary position.

In the case of better paper and ink quality, the general printing sequence is black, cyan, magenta, and yellow. When the paper quality is poor, the surface is rough, the tightness is low, and the ink absorption is strong, the color sequence may be yellow, magenta, cyan, and black. Due to the large area of ​​the yellow version, it can make up for paper defects. Make the printing effect better. In addition, the use of yellow, magenta, cyan, black sequence, is conducive to color change, easy to clean the ink roller, ink tank. Another reason why a monochrome offset press prints a yellow version is that human vision is insensitive to yellow dots, and even if a pale yellow color is printed, even if it is slightly overprinted, it is not easily visible to the naked eye. Facilitate the effect of four-color overprint.

(2) In the printing of the two-color machine, the second color and the third color are wet-overprinted. The printing of 1-2 colors and 3 to 4 colors is a wet and dry wet overprint. The printing color sequence of a two-color machine is alternately suitable for bright and dark colors. The large amount of ink is placed in the second color group. Therefore, the following are commonly used in printing. Printing color sequence: 1-2 color magenta-cyan or cyan-magenta; 3-4 color black-yellow or yellow-black, but also as needed. To emphasize a heavy color, such as green, it should be printed according to the magenta-yellow, cyan-black overprint color sequence, so as to obtain a better printing effect.

It is also possible to use black-yellow, magenta-cyan color sequences, which are easier to control.

(3) Four-color printing is wet and wet printing. To make the latter color ink transfer well to the ink layer of the previous color substrate, the adhesion of the ink should be reduced along the color sequence of the printing sequence. Otherwise, an inverse stacking will occur. Printing phenomenon. It is generally the first printing ink dark color sticky, the printing ink sticky bright color. The commonly used color sequence is black, cyan, magenta, yellow, or black, magenta, cyan, and yellow. While changing the color sequence, the viscosity of the ink should also be adjusted accordingly.

In four-color printing, yellow ink is printed in the last color, and there are three main advantages:

(1) Since the yellow ink has good transparency, it is advantageous for the last color to inject enough light into the upper and lower ink layers to make the print more vivid.

(2) The yellow ink has a faster drying performance and a larger printing area. Putting the yellow ink on the last color not only prevents the crystallization caused by the rapid drying of the yellow ink, but also makes use of its large printing area and the ability to quickly oxidize the conjunctiva. The cover covers the surface of other ink layers. Improve the gloss of prints.

(3) Yellow is arranged in the last color, which is convenient for controlling the amount of yellow ink used, and can be adjusted against the proof at any time.

6, according to the nature of paper arranged color sequence

The smoothness, whiteness, tightness, and surface strength of the paper vary from each other. Plain and tight papers are printed in dark colors first and printed in bright colors. Coarse and loose paper are printed with bright yellow ink and dark colors after printing because yellow ink can be used. Cover paper defects such as paper and powder.

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