Technical questions and answers on ink color alloc

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Technical Q & A on ink color allocation in color printing in order to enable packaging printers and ink manufacturers to master, apply and allocate ink hue well, the author, based on his own experience and in response to the recent questions raised by hundreds of domestic ink and printing enterprise customers, gives a rough reply as follows, and requests the company to achieve a sales revenue of 12billion yuan and a profit of 1.24 billion yuan

1. How are the optical properties of printing ink film formed

in the packaging printing ink system, the binder is a colorless or slightly colored plastic liquid. The refractive index of the binder is very close to that of water, so the binder has a certain transparency. When we add pigments and fillers, because the pigments and fillers block the light, the ink film will be reflected again, and a series of optical changes will occur, resulting in the optical properties of the printing ink film

2. How is mixed color (or multicolor) established

after the verification of experiment and comparison, it is found that when sunlight enters the yellow color printing ink film, it means that it absorbs the blue spectrum in sunlight and emits yellow and green. However, when the reflected yellow or green light meets the blue pigment particles, it will often reflect the blue light and absorb only the green light. After a series of reflection and refraction, the green ink film can only be reflected. Therefore, people call this kind of printing ink color mixing subtractive mixing - that is, absorbing each other's required wavelengths without being reflected by the absorbed spectrum. This is the origin (establishment) of the mixed color

3. How to distinguish subtraction of three primary colors from addition of nature in packaging printing ink

in China's packaging printing ink industry, due to the principle of subtraction, the complementary color of three primary colors is adopted, that is, the complementary color of subtraction (the complementary color of red is green, the complementary color of green is magenta, and the complementary color of blue is yellow). We use the magenta, green, and yellow of the three subtraction primary colors to overlap to form black (at high density), and form various mixed colors when the density of the three primary colors changes. In order to avoid conceptual confusion, the three primary colors of addition in nature are red, green and blue. Therefore, we cannot generally simplify the three primary colors of packaging printing ink into red, yellow and blue. In a word: red is not equal to magenta, and blue is not equal to green. This is the different concept and difference between subtraction and addition

4. What are the three primary colors of printing ink? What are the three colors of printing ink? What is the four colors of printing ink

(1) three primary colors: yellow, magenta and cyan

(2) three colors: red, green and blue

(3) four multicolor: purplish red, bronze, olive green and black

5. How to master the principle of subtraction? What is the basic knowledge

due to the needs of our packaging, printing and decoration designers in color configuration, we often have sufficient ideas in printing colors, and can combine them into a new form of expression from three primary colors, three intermediate colors and four complex colors. Just like the well-known combination of different ink hues (hues), different ink lightness and different ink chromaticity, it will also give people a soft and harmonious feeling of beauty. The rhythm of printing ink color also has its most basic law, which is often divided into warm color and cold color. The warm colors mentioned by the author are: red, orange and yellow; The cool colors are green, blue, blue and purple. In addition, in addition to the warm and cold color tones, there are neutral light purple, light gray and so on. We know that different printing ink colors will give people different feelings, and will trigger people's different mood description and depiction with different packaging printing ink colors. For example, the white ink film symbolizes purity and simplicity; Red ink film is festive, enthusiastic and just; Yellow ink film makes people excited; Cyan ink film often reflects tranquility and farsightedness; And the gray ink film really gives people generosity and balance

except for the three primary colors, most of them are composite colors, and composite hue itself is a science. Finally, the prepared color of packaging and printing pictures and texts is verified by visual inspection - good or bad. But the starting point is inseparable from the chromatics of printing ink, especially color aesthetics. Therefore, the selection of printing color must closely cooperate with the environment, which is the basic knowledge of the basic principle of subtraction

6. How to use the graphic decoration of printing ink to improve the quality of work and life

no matter the warm color, it gives people the feeling of expanding, lively, warm and psychological balance; Or does cool color give people the feeling of contraction, elegance, softness, solemnity and psychological calmness. In the vast world of mankind, we can't be in the same strong atmosphere all the time, so we need some adjustment. For example, the strong color decoration environment will make people tired or irritable, while the dark environment will make people depressed. Our decorating designers and packaging printers use the printed decorating colors to give consumers the commodities they need, decorate colorful and dazzling ink colors, constantly adjust people's working and living environment, and also give people benign stimulation, which is conducive to promoting the improvement of work and life quality

in daily life, as long as we focus on the theme of adjusting the working and living environment, we often have several colors or light, medium and deep levels for the packaging and decoration of goods in the same environment. Therefore, the coordination between colors and the use of light and thick layers have always been the central topic of our research. For example, complementary (red and green) colors (the sum of the two colors equals white) sometimes give people a vulgar or even dirty feeling if they are not well matched. If it is well prepared, people will feel strong and eye-catching, and even pay attention to cleanliness and hygiene. Another example is light yellow with red brown. Because the colors between yellow and red are similar, the similar colors can give people a harmonious beauty. There are dark green and light green, the color is fresh and not dazzling. In recent years, people have adopted the method of matching achromatic and color at the same time, which gives people a bright feeling and protects their eyesight. The three hues of red, white and blue appear on one package at the same time, giving people the feeling that red is warm, white is pure, and blue is solemn, reflecting the beauty of a commodity

therefore, the author said with deep feeling: the colors and varieties of printing inks used in the 1980s, the low price and quality of printing inks used in the 1990s, and the safety and health of packaging printing inks used in the 21st century

7. What is the meaning of printing ink color

color of packaging printing ink another theory is that the color of printing ink is inseparable from physics, physiology and psychology. In short, the color we have studied for a long time is often dominated by psychological feelings, because once the packaging printing ink is printed on the surface of the substrate, it can not only improve the performance of the substrate, but also give various colors to commodity objects. The color of the printing ink depends on the choice and composition of pigments. For thousands of years, human beings have developed new ink color varieties and improved the quality of traditional color hue for the needs of commodities and commodity packaging

we know that the printing ink color on the surface of the substrate is often restricted by its own chromaticity. If it is green, red, white, etc. under the standard light source, but if the ambient light or different lighting conditions, the printed ink film will show different results. The surface decoration color of any kind of packaging printing object is not known at a glance. As a packaging printing worker or printing ink manufacturer, in order to fully reflect the benefits of printing ink color, we should constantly study the artistic conception of color change of printing ink film based on the knowledge of color colorimetry, so as to guide the operation of printing ink color printing and ink manufacturing

8. What is the concept of homochromatism in printing decoration

in order to meet the needs of the color varieties of packaging printing inks, it is not enough to rely on the existing colors. The color inks should be repaired or replaced in time in the market. Basically, the color inks require serialization, which must be obtained through a certain color matching process. The new color hue is obtained once the intermediate color or multicolor is printed, which is not only in line with the normal packaging and printing law, but also in line with the color matching law

in order to meet the above requirements, people put forward the concept of the same color and different spectrum color. In general, people's practice, the concept of homochromatism is only useful for specific standard observers, but not for color blind people (physiological disorders). Metamerism refers to the same stimulus value of printing ink color, different spectral distribution and different ink color samples, which is very important for color matching of color packaging printing ink. We can only achieve a certain degree of approximation in the actual color matching, and can evaluate it by the shape of the spectral reflectance factor curve of the sample. From a qualitative point of view, the more approximate and coincident the reflectance factor curves of the two samples, the more intersection points, the more it can be proved that the prepared color is similar to the sample. If we analyze and evaluate from a quantitative point of view, we can calculate the excellent difference through the chromaticity of two ink samples - that is, how much they have the same color spectrum

for the designers of packaging and printing ink blending color or packaging and printing ink formula, if the qualitative analysis is obtained by means of the colorimeter and the reflectivity factor curve, the quantitative analysis can be made by means of color difference (AE)

9. Why is the focus of competition among ink enterprises color, followed by adhesion and gloss

in modern packaging and printing products, the key to keep old customers or seize the commanding heights of science and technology is color. Individual operators (including decoration designers) only believe in experience, do not care about scientific theory, or always talk about scientific theory, and do not pay attention to process skills. When ink printing and printing samples are sent to customers, either the hue is inaccurate, or the oxide is easy to exceed the standard. Either the time is too long, or the printing cost is high. They do not understand the basic competitive intention - eliminate the inaccurate color allocation, or the gloss after printing, or the time is too long, Or the cost is high, or even exceeds a certain environmental protection standard, which wastes the opportunity for its enterprises or new products to try. For this reason, the author deeply understands that the advantage of color blending is that the market measures the level of a packaging and printing enterprise or even a printing ink enterprise

in addition to color blending, high gloss and good adhesion fastness are also the basic elements for commodity packaging users

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10. How to mix other colors from the three primary colors

generally, the three primary colors can be mixed with the following ink hues:

serial number name primary color red (magenta) primary color yellow (medium yellow) primary color blue (blue) Proportional hue

a/1 intercolor 50.0 50.0 1:1:0 bright red

2 intercolor 25.0 75.0 1:3:0 dark yellow

3 intercolor 75.0 25.0 3:1:0 golden red

4 intercolor 20.0 80.0 1:4:0 orange red

5 intercolor 10.0 90.0 1:9:0 orange yellow

6 intercolor 1.0 99.0 1:99:0 dark yellow

7 intercolor 25.0 75.0 1:0:3 dark blue purple

8 intercolor 50.0 50.0 1:0:1 dark blue

9 intercolor 75.0 25.0 3:0:1 red and green lotus

10 intercolor 50.0 50.0 0 0:1:1 Green

11 intercolor 75.0 25.0 0 0:3:1 emerald green

12 intercolor 80.0 20.0 0 0:4:1 apple green

13 intercolor 25.0 75.0 0 0:1:3 dark green

b/14 polychrome 50.0 25.0 2:1:1 brown red

15 polychrome 66

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