Analysis of the principles to be followed in the selection of printing color sequence

1. Arrange the color sequence according to the brightness of the three primary colors

The brightness of the three-primary-color ink is reflected on the spectrophotometric curve of the three-primary-color ink. The higher the reflectivity, the higher the brightness of the ink. Therefore, the brightness of the three primary inks is yellow> cyan> magenta> black. The first printing with small brightness and the second printing with large brightness.

2. Arrange the color sequence according to the transparency and hiding power of the three primary inks

The transparency and hiding power of the ink depends on the difference between the refractive index of the pigment and the binder. The ink with strong covering effect has a great influence on the color after over-coloring. As the post-printing color over-printing, it is not easy to show the correct color, and a good color mixing effect cannot be achieved. Therefore, the ink with poor transparency is printed first, and the strong transparency is printed afterwards.

3. Arrange the color sequence according to the size of the dot area

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

4. Arrange the color sequence according to the characteristics of the original

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

5. Arrange the color sequence according to different printing equipment

(1) Color sequence of monochromatic machine: When printing monochromatic products with monochromatic machine, the transfer of ink belongs to wet stacking. When considering the color sequence, the viscosity of ink can be put in a less important position.

Under the conditions of good paper and ink quality, the general printing color sequence is black, cyan, magenta, and yellow. When the quality of the paper is poor, the surface is rough, the tightness is low, and the ink absorption is strong, the color sequence can be selected as yellow, magenta, cyan, and black. Due to the large area of ​​the yellow plate, it can make up for the defects of the paper. Make the printing effect better. In addition, the order of yellow, magenta, cyan and black is adopted, which is conducive to color change and easy to clean the ink roller and ink tank. Another reason why the monochrome offset press prints the yellow version first is that human vision is not sensitive to the yellow dots. When printing the light color yellow version, even if there is a slight overprinting phenomenon, it is not easy to observe with the naked eye, so Conducive to the effect of four-color overprint.

⑵The second color and the third color in the printing of the two-color machine are wet stack dry overprint. The printing of 1-2 colors and 3 to 4 colors is wet stacked wet overprinting. The color sequence of the two-color machine is preferably alternating between light and dark colors. The large amount of ink is placed in the second color group, so the following are generally used in printing Printing color sequence: 1-2 colors magenta-cyan or cyan-magenta; 3-4 colors black-yellow or yellow-black, but also according to need. To highlight a certain heavy color, such as green, it should be printed in the magenta-yellow, cyan-black overprint color sequence, so as to obtain a more ideal printing effect.

The color sequence can also be black-yellow, magenta-cyan, which is easier to control.

(3) Four-color machine printing is a wet press wet printing method. If the ink of the latter color can be transferred to the ink layer of the substrate of the previous color, the adhesion of the ink in the printing color sequence should be reduced in sequence, otherwise it will cause reverse stacking Printing phenomenon. Generally, the dark color with large ink viscosity is printed first, and the bright color with low ink viscosity is printed later. Commonly used color sequence is black, cyan, magenta, yellow, or black, magenta, cyan, yellow. While changing the color sequence, the viscosity of the ink should be adjusted accordingly.

In the four-color machine printing, the yellow ink is discharged to the last color printing, which has three main advantages:

(1) Due to the good transparency of yellow ink, the last color is good for enough light to enter the upper and lower ink layers, so that the color of the printed matter is more vivid.

⑵The drying performance of yellow ink is faster and the printing area is larger. Arranging the last color of yellow ink can not only prevent the crystallization caused by the drying speed of the yellow ink is too fast, but also use its large printing area and can quickly oxidize the conjunctiva. Cover the surface of other ink layers. Improve the gloss of printed matter.

⑶ The yellow color is arranged in the last color, which is convenient for controlling the yellow ink consumption, and can be adjusted at any time according to the sample.

6. Arrange the color sequence according to the nature of the paper

The smoothness, whiteness, tightness and surface strength of the paper are different. Flat and tight paper is printed with dark color first, and then bright color; thick and loose paper is printed with bright yellow ink first, and then printed with dark color, because yellow ink can Cover paper defects such as paper wool and powder. [next]

7. Arrange the color sequence according to the drying performance of the ink

Practice has proved that yellow ink dries nearly twice faster than magenta ink, magenta ink doubles faster than cyan ink, and black ink has the slowest fixation. Ink with slow drying performance should be printed first, and ink with fast drying performance should be printed later. Monochrome machine is to prevent the crystallization of the ink surface, usually printed yellow at the end to facilitate rapid conjunctiva drying.

8. Arrange the color sequence according to the flat screen and the field

When the printed matter has a flat screen and a solid field, in order to obtain good printing quality, the solid field is printed flat, the ink is thick, and the color is bright. Generally, the flat screen is printed first, and then the solid field is printed.

9. Arrange the color sequence according to light and dark colors

In order to make the printed matter have a certain gloss and add light color, dark color is printed first, and then light color is printed.

10. Products based on text and black version generally adopt cyan, magenta, yellow, and black sequences, but black text and patterns cannot be printed on the yellow field, otherwise reverse overprinting will occur due to the low viscosity of yellow ink and the large black viscosity. The phenomenon that the black is not printed or is not true is printed.

11. For pictures with a small four-color overprint area, the color registration sequence can generally adopt the principle of post-printing with a large color area.

12. For gold and silver products, since the adhesion of gold ink and silver ink is very small, gold and silver ink should be placed in the last color as much as possible. In general, it is not suitable to use three-fold ink printing.

13. The color sequence of the printing should be as consistent as possible during the proofing, otherwise it will not be able to catch up with the effect of the proofing.

14. When printing, the angles of adjacent two color sequences should be separated by 30 °. If black, cyan, magenta, and yellow sequences are used, the corresponding network cable angles are black 75 °, cyan 15 °, magenta 45 °, and yellow 90 °. In summary, in the actual printing production, according to the quality requirements of the printed matter, the performance of the paper and ink, the accuracy of the printing press, etc., the printing color sequence is flexibly arranged to achieve the best printing effect.

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