Why color sequence in printing? These 14 cases, the printing color sequence is different
Time:2023-07-03
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For example, four-color printing presses or two-color printing presses are affected by the color order. Generally speaking, it is the use of different color sequence arrangements in printing, the result of printing is not the same, and sometimes the printing color sequence determines the beauty of a printed matter.
Today, we will learn with you the factors that affect the reasonable arrangement of printing color order and the principles that need to be followed.
First, the reason why the printing color sequence needs to be arranged
There are three main reasons for the need to arrange the printing color sequence:
① The influence of ink on each other and the shortcomings of ink color itself
② Quality of paper
The ability of the human eye to recognize color
One of the most fundamental reasons is the incomplete transparency of the printing ink itself, that is, the hiding power of the ink itself, the post-printing ink has a certain hiding effect on the first printed ink layer, resulting in the color of the printed matter is always biased toward the performance of the latter color, or the mixed color of the former color and the former color.
Second, the factors affecting the printing color sequence
1. Consider from ink transparency
The transparency of the ink is related to the hiding power of the pigment in the ink. The so-called ink covering power refers to the covering ability of the covering layer ink for the underlying ink. If the hiding power is poor, the ink transparency is strong, and if the hiding power is strong, the ink clarity is poor. Generally speaking, the ink with poor covering power, that is, strong transparency, should be printed at the back, so that the brilliance of the pre-printing ink will not be covered to facilitate the reproduction of color. Ink transparency relationship: Y>M>C>K.
2. Consider from ink brightness
Low brightness first printing, high brightness after printing, that is, deep ink first printing, light ink after printing. Because the higher the brightness, the higher the reflectivity, the more vivid the color is reflected, and the overprint the light color on the dark color, the trace overprint is not allowed to be very conspicuous; If you put a dark color on a light color, it will show. In general, the brightness of the ink size relationship: Y>C>M>K.
3. Consider the drying speed of the ink
Slow drying speed printing first, fast printing after. If the first printing is fast, for the monochrome machine, because it is wet pressed dry, it is easy to glass, which is not conducive to fixation; For multi-color machines, it is not only conducive to the overprinting of ink layers, but also easy to cause other drawbacks, such as the back rub. The order of ink drying speed: yellow is 2 times faster than red, red is 1 times faster than green, black is the slowest.
4. Consider the nature of the paper
4. Consider the nature of the paper
① Surface strength of paper
Paper surface strength refers to the binding force between the paper surface fiber and fiber, fiber and rubber, filler. The greater the binding force, the higher the surface strength, and the degree of depowder and hair removal on paper is often measured in printing. For the surface strength is good, that is, the binding force is large, not easy to powder, hair off the paper, we should first print the viscosity of the ink, the viscosity of the first color printing is also conducive to overprinting;
② For good whiteness of paper, dark color should be printed first after light color;
③ For rough and loose paper, print light color first and then print dark color.
Three, the printing color order must follow the principle
Printing color order will directly affect the quality of printed products, in order to obtain a good copy effect, must follow the following principles:
1. Arrange the color order according to the flat net and the field
When the replica has a flat screen and a field, in order to obtain good printing quality, make the field plain clothes, the ink color is bright and thick, generally print the flat screen graphics first, and then print the field structure.
2. Arrange the color order according to light and dark colors
In order to make the printed matter have a certain gloss and add light colors, print dark colors first, and then print light colors.
3. Arrange the color order according to the image area
Landscape products of the green layout text area is much larger than the magenta version, according to the graphic area of large color plate after printing principle, it is appropriate to use black, magenta, green, yellow order.
4. Products based on text and black field
Products based on text and black field generally use green, magenta, yellow, black order, but can not print black text and patterns on the yellow field, otherwise due to the small viscosity of yellow ink, black viscosity and reverse overprinting, resulting in black printing or false printing phenomenon.
5. Products with small four-color overprint area
For a picture with a small four-color overprint area, the color sequence can generally adopt the principle of post-printing with a large graphic area.
6. Gold and silver products
Gold and silver products, due to 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, and under normal circumstances, it is not appropriate to use three overlapping ink printing.
7. Four-color machine printing five-color live
The color order of printing should be as consistent as possible with the color order of proofing, otherwise it will not catch up with the effect of proofing.
If it is a 4-color machine, printing 5 colors, it is necessary to consider the problem of embossing or overprinting, and the color overprinting of the general bite position is more accurate. If there is overprinting, be sure to do trap printing, or overprinting is not easy to leak white.
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