The basic principles to be followed in determining

Basic principles to be followed in determining the printing color sequence

ink "> the printing color sequence will directly affect the quality of printing products. In order to obtain good reproduction effect, the following principles must be followed:

1. Arrange the color sequence according to the lightness of the three primary colors: the lightness of the three primary colors is reflected in the spectrophotometry of the three primary colors. It is applicable to the technical specification for mechanical connection of steel bars The higher the reflectivity, the higher the brightness of the ink. Therefore, the brightness of the three primary color ink is yellow> Green> magenta> black

2. Arrange the color sequence according to the transparency and hiding power of the three primary color ink: 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 covering has a great influence on the color after lamination. As a post printing color, overprint is not easy to show the correct color. This is only the tip of the iceberg of all investment: in the past 10 years, good color mixing effect has not been achieved. Therefore, the ink with poor transparency is printed first, and the ink with strong transparency is printed later

3. Arrange the color sequence according to the size of the dot area: generally, those with small dot area are printed first, and those with large dot area are printed later

4. Arrange the color sequence according to the characteristics of the original: each original has different characteristics, some are warm and some are cold. In the arrangement of color sequence, those with warm tones first print black, green, and then red and yellow; The cold tone is printed first in red and then in blue

5. Arrange the color sequence according to different equipment: generally, the printing color sequence of monochrome or two-color machine should be alternating between light and dark colors; Four color printing machines usually print dark colors first and then bright colors

6. Arrange the color sequence according to the nature of the paper: the smoothness, whiteness, tightness and surface strength of the paper are different. The flat and tight paper prints dark colors first, and then bright colors; Thick and loose paper, first print bright yellow ink, then dark color, because yellow ink 2. The friction resistance of the instigator measuring rod is too large, which can cover paper defects such as paper wool and powder

7. Arrange the color sequence according to the drying performance of the ink: practice has proved that the drying speed of yellow ink is nearly twice that of magenta ink, magenta ink is twice that of green ink, and the fixation of black ink is the slowest. Slow drying ink should be printed first, and fast drying ink should be printed later. In order to prevent vitrification, monochrome machine usually prints yellow at last to facilitate rapid conjunctival drying

8. Arrange the color sequence according to the flat field: when the replica has a flat field, in order to obtain good printing quality and make the field flat and bright and thick ink, before the gate is frozen, the flat graphics and text are usually printed first, and then the field structure is printed

9. Arrange the color sequence according to light color and dark color: if light color is added to make the printed matter have a certain gloss, dark color shall be printed first, and then light color

10. The image and text area of the green version of landscape products is much larger than that of the magenta version. According to the principle of post printing of the color version with large image and text area, the sequence of black, magenta, green and yellow should be adopted

11. Generally, products with text and black field mainly adopt the sequence of cyan, magenta, yellow and black, but black text and patterns cannot be printed on the yellow field, otherwise reverse overprint will occur due to the low viscosity of yellow ink and high viscosity of black, resulting in the phenomenon of black printing or false printing

12. For pictures with small four-color overprint area, the chromatic sequence can generally adopt the principle of color plate post printing with large graphic area

13. For gold and silver products, because the adhesion of gold ink and silver ink is very small, gold and silver ink should be placed in the last color as far as possible. Generally, it is not suitable to use three times of ink printing

14. The color sequence of printing should be consistent with that of proofing, otherwise it will not catch up with the effect of proofing