How to arrange printing sequence correctly

The color of the print is overprinted with inks of different hue. The order of the overprinted ink is called the print sequence. According to the principle of permutation and combination, four colors (yellow, magenta, cyan, and black) can be printed in 24 different color orders, but only by selecting the printing color sequence that conforms to the rules of overprinting can the color of printed matter be closer to the original. In order to make the image level clear, clear points, and achieve the right balance of gray. However, due to mutual overprinting, ink defects and paper quality and other factors, different printing color sequences will directly affect the quality of the printed matter. Therefore, scientifically and reasonably arranging printing color sequences can only obtain high-quality prints that are correct, soft, rich in gradation, and have the right color tones to meet the needs of customers.

Determine the general principles of printing color sequence

1. According to the original content and characteristics of the printing color sequence. Prints that are generally warm-colored, such as figure paintings, are printed with blue, black, and later printed magenta and yellow; prints with cold colors, such as snowscapes and landscapes, are printed first, followed by magenta, and then printed. green.

2. Text and black field-based prints generally use cyan, magenta, yellow, and black. However, black characters and patterns cannot be printed on the yellow solid because the yellow ink has a small viscosity and the black ink has a large viscosity, which tends to cause an inverse printing phenomenon, resulting in black ink not being printed or printed.

3. According to the size of the dot coverage area, the printing color sequence is determined. Under normal circumstances, the network covers a small area of ​​the first printing, outlets cover a large area of ​​the post-print.

4. According to flat screen and field arrangement printing color sequence. When the printed matter has flat screen and on the spot, in order to obtain good printing quality and avoid the problem of dirtiness in the process of paper hand-over, the plain clothes and the bright and thick ink will be printed on the web.

5. According to the model arrangement printing color sequence. Monochrome machines and multicolor machines have different printing conditions due to different overprinting conditions (the former is wet and dry, the latter is wet and wet). Under normal circumstances, the color sequence of the monochrome machine and the two-color machine is alternated between bright and dark colors. Four-color printing machines generally print dark colors first, and then print bright colors.

6. The printing sequence is arranged according to the nature of the paper. The smoothness, whiteness, fiber looseness, surface strength, and ink absorption of various papers are different. For papers with good ink absorption, dark colors are first printed, and bright colors are printed afterwards; for papers with poor ink absorption, bright colors are printed first and then Dark color printing, because bright ink such as yellow ink can cover off the hair, powder and other paper defects. In hot summer days, when printing in monochrome on white paperboard, you may print water first if you experience uneven paper moisture content, uneven wrinkles, poor paper surface strength, which may cause paper lint and powder off. Measures.

7. The color sequence of printing is arranged according to the brightness of the three primary color inks. The lightness of the ink is reflected on the spectrophotometric curve of the ink. The higher the reflectance, the higher the lightness of the ink. The order of brightness of the three primary colors is yellow> cyan> magenta> black.

8. The printing color sequence is arranged according to the transparency and hiding power of the three primary color inks. The transparency and hiding power of the ink depend on the difference between the refractive index of the pigment and the binder. The ink with strong hiding power has a greater influence on the color after overprinting, and if the printing is not easy, the correct color cannot be displayed, and a good color mixing effect cannot be achieved. Therefore, in general, inks with poor transparency are printed first and inks with strong transparency are printed afterwards.

9. The printing sequence is arranged according to the drying property of the ink. Practice has shown that yellow ink is nearly twice as fast as magenta ink, magenta ink is twice as fast as blue ink, and black ink is the slowest. Dry slow ink should be printed first, fast dry ink after printing. The monochromatic machine is overprinted to prevent vitrification and is generally printed with yellow to accelerate the drying of the conjunctiva.

10. The printing color sequence is determined according to the viscosity of the ink. The monochromatic machine superimposes the second color after the first color is dry, and the multicolor machine is wet and wet overprinting. Therefore, the viscosity of the ink and the amount of ink should be controlled. The ink with a large viscosity is printed first, and the ink with a small viscosity is printed. India.

11. According to the dark and light color arrangement printing color sequence. In order to make the printed material have a certain degree of gloss, when encountering the situation of printing a light color, the dark color is printed first and the light color is printed later.

12. The printing color sequence is determined according to the fitting characteristics. Two-color machine printing four-color printing should be as close as possible to select the two-color tightly fitting the first printing, fitting requirements are not high after the two-color printing.

Special requirements for printing color arrangement

1. When printing securities, the pattern is usually printed first, and the pattern, text and numbers printed.

2. When copying manuscripts of a color print, the color sequence of printing should be consistent with the color registration sequence of the color print.

3. New-year pictures, monthly calendars, etc., have a type of printed matter with a spot color border, and spot color borders are usually printed last.

4. Need to use India printed matter, the printing color sequence is generally the opposite of the color sequence.

5. There are glazing, bronzing (calcined aluminum), film requirements of the printed matter, the process is generally printed in color ink, after the glazing, bronzing and film. However, for prints with certain special requirements, when other colors need to be printed on the electrodeposited aluminum, the above process flow must be changed, and it must be noted that the adhesion of the ink should not be greater than the adhesion of the aluminum foil to the substrate and the ink should be printed first. Layer adhesion to anodized aluminum.

6. When prints are printed with gold or silver ink, gold and silver inks should be printed on the final print because of the low adhesion of gold and silver inks. If there are texts and patterns on gold and silver inks, they should be printed separately.

7. The superiority of the last printing of yellow ink in four-color printing. 1 Since the yellow ink has good transparency, arranging printing in the last color facilitates sufficient white light to enter the upper and lower ink layers to obtain vivid and bright colors, which is conducive to better color reproduction of printed materials. 2 yellow ink has a faster drying performance, but also has a larger printing area. The yellow ink is arranged in the last color printing, which can prevent the vitrification caused by the fast drying speed of the yellow ink, and can fully utilize the characteristics that the printing area is large and can oxidize the conjunctiva very quickly, covering the surface of other ink layers. Make the print have a certain degree of gloss.

In short, in the specific printing process, according to the quality requirements of the printed matter, according to the law of overprinting, the best printing color sequence should be selected flexibly so as to avoid weaknesses, control color deviations, and print the most ideal prints.