Why does printing need color order?
Time:2022-09-19
Views:2652
Today, we will learn with you the influence factors of the reasonable arrangement of printing color sequence and the principles to be followed.
First, the printing color sequence needs to be arranged
(1)The influence of ink overprinting and the shortcomings of ink color itself.
(2)The quality of paper
(2)The quality of paper
(3)The ability of human eyes to recognize color
The most fundamental reason is the incomplete transparency of the printing ink itself, that is, the covering power of the ink itself. The printing ink has a certain covering effect on the ink layer of the first printing, so that the color of the printed matter always focuses on the performance of the latter color, or the mixture of the after color and the front color.
Second, the factors affecting the printing color sequence
1、The ink transparency
The transparency of ink and ink pigment covering power. The so-called ink cover power refers to the cover layer of ink for the underlying ink cover ability. Covering power is poor ink transparency, covering power is strong ink brightness. Generally speaking, should be the poor covering power that is the transparency of the ink on the back of the printing, so that the front printing ink gloss cover in order to facilitate the reproduction of color. Ink transparency strength relationship: Y>M>C>K.
2、The 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 reflectance, the more vivid the color is reflected, and the light color is overprinted on the dark color, and the trace overprinting is not very conspicuous; If you put a dark color on top of a light color, it will be completely exposed. In general, ink brightness size relationship: Y>C>M>K.
3、The ink drying speed
Slow drying speed first printing, fast printing later. If the first printing fast, for monochrome machine, because it is wet dry, it is easy to glass, is not conducive to fixation; For multicolor machine, not only is not conducive to the overprinting of the ink layer, but also easy to cause other ills, such as the back of the dirt. The order of ink drying speed: yellow faster than red 2 times, red faster than green 1 times, black the slowest.
4、The nature of the paper
(1)The surface strength of the paper
Paper surface strength refers to the paper surface fiber and fiber, fiber and glue, filler between the binding force. The greater the binding force, the higher the surface strength, often in printing paper surface dedusting, hair loss degree to measure. For good surface strength, that is, the binding force is large, not easy to depowder, hair off the paper, we should first print the viscosity of ink, viscosity of the first color printing is also conducive to overprinting;
(2)For good whiteness of paper, should be printed in dark color after light color;
For rough and loose paper, the first printing light color and then dark.
Three, printing color sequence must follow the principle
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、According to the flat screen and field arrangement color sequence
Reproduction of flat screen and field, in order to obtain good printing quality, so that the field, bright and thick ink, generally printed flat screen text and text, after printing field structure.
2、According to light and dark color order
To add a light color to a printed matter in order to give it a certain luster, first a dark color and then a light color.
3、Arrange the color sequence according to the area of text and text
Landscape products of green map text area is much larger than magenta version, according to the principle of large graphic area of the color plate after printing, it is appropriate to use black, magenta, green, yellow sequence.
4、Products based on text and black field
The products mainly based on text and black field are generally green, magenta, yellow and black, but the black text and design can not be printed on the yellow field, otherwise due to the small viscosity of yellow ink, the high viscosity of black and reverse overprinting, resulting in the black can not be printed or printed incorrectly.
5、Four color overprint area is very small products
For the four-color overprint area is very small screen, the color sequence can generally use a large graphic area of the color plate after the principle of printing.
6、Gold and silver products
Gold and silver products, because the adhesion of gold and silver ink is very small, gold and silver ink should be put in the last color as far as possible, in general, it is not suitable to use three times overlapping ink printing.
7、Four color machine printing five colors live
The color sequence of printing should be consistent with the color sequence of proofing as far as possible, or it will not catch up with the effect of proofing.
If it is a 4 color machine, printing 5 color live, it is necessary to consider the problem of embossing or overprinting, the general bite position of the color overprinting is more accurate. If there are overprints, we must make a trap, or overprints are not allowed to leak.
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Anna Zhang