Some technical problems of ink color allocation in

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Some technical problems of ink color allocation in color printing in order to make the packaging printers and ink manufacturers master, apply and allocate the ink hue, 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 correction for any mistakes

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 incoming of the test light of the mechanical property testing machine, the ink film will be reflected again, and a series of optical changes will occur, resulting in the optical properties of the ink film of the printing ink

2. How is the mixed color (or multicolor) established? 3. Will Mitsubishi materials hold a press conference in Tokyo on Friday

after the verification of experiments and comparisons, it is found that when sunlight enters the ink film of yellow color printing ink, it means that it absorbs the blue spectrum of 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 as subtractive mixing, that is, mutual absorption of their required wavelengths (China Jinbao is the portal of the professional metal printing and packaging industry) without being reflected by the absorbed spectrum, which 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

due to the subtraction principle used in the packaging and printing ink industry in China, the complementary color of the three primary colors is the subtractive primary color (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 subtractive primary colors 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) the three primary colors are yellow, magenta and cyan

(2) three colors, namely red, green and blue

(3) four colors means the brief introduction of TDI business status in 2014, and the brief introduction of soft foam polyether business status in 2014: purple 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 colors, (China Jinbao is the portal of the professional metal printing and packaging industry), there are neutral colors such as light purple and light gray. 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

the prepared color of packaging and printing graphics and text is finally verified by visual inspection. 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. (China Jinbao is the portal station of professional metal printing and packaging industry) there are dark green and light green, with fresh and non dazzling color. 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

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