Some Technical Problems of Ink Color Layout in Color Printing (II)

8. What is the concept of metamerism in printing and decorating?

To meet the needs of color varieties for packaging printing inks, it is not sufficient to rely on only a few colors. The finished color inks in the market basically require serialization, which must be achieved through a certain color matching process. A new color hue is obtained by the printing of the multi-color or multi-color, which is in line with the normal packaging and printing law, but also with the color matching rules.

In order to achieve the above requirements, people proposed the concept of metamerism color. Usually people practice, the metamerism concept is only useful for specific standard observers, but not for color blind people (physiological obstacles). Same metamerism refers to the same stimulation value of the color of the printing ink, the distribution of the spectrum is different, and the color of the ink sample is different, which is very important for color matching of the packaging printing ink. We can only achieve a certain degree of approximation in the actual color matching, and can be assessed by the spectral reflectance factor curve shape of the sample. From a qualitative point of view, the more similar, more coincident the reflectance factor curves of the two samples are, the more intersections are, and the more the color hue of the prepared sample can be shown to be close to the sample. If the assessment is performed from a quantitative point of view, the outstanding difference can be calculated from the chroma of the two ink samples—that is, how much of their metamerism.

For package printing ink formulation color or packaging printing ink formula designers, if the qualitative analysis is made by means of a colorimeter and a reflectance factor curve made when color matching, it can be quantitatively analyzed through color difference (AE).

9. Why is the competition of ink companies focused on color, followed by adhesion and gloss?

In modern packaging and printing products, it is essential to retain old customers or to seize the commanding heights of their science and technology. The key is color. Individual operators (including decorators) only believe in experience, do not care about scientific theory, or always talk empty about scientific theory, and do not pay attention to craftsmanship. When ink printing and printing samples are sent to customers, they are either inaccurate or susceptible to oxidation. Excessive standards, not the time is too long, is the high cost of printed materials, do not understand this minimum content of the original intention of competition - out of color deployment is not allowed, or dull print, or time is too long, or high cost, even more than a certain An environmental protection standard is a waste of opportunities for companies or new products to try. For this reason, the author has a deep understanding of the advantages of color deployment is the market to measure the level of a packaging and printing companies and even printing ink companies.

In addition to color deployment, commodity packaging users have high gloss and good attachment fastness as the basic elements.

10, how to deploy other colors from the three primary colors hue?

Usually the three primary colors can be formulated with the following ink hue:
No. Name Primary Color Red (Magenta) Primary Color Yellow (Yellow) Primary Color Blue (Green) Ratio Hue
A/1 color 50.0 50.0 1:1:0 red
2 colors 25.0 75.0 1:3:0 dark yellow
3 colors 75.0 25.0 3:1:0 golden red
4 colors 20.0 80.0 1:4:0 orange
5 colors 10.0 90.0 1:9:0 orange
6 colors 1.0 99.0 1:99:0 dark yellow
7 colors 25.0 75.0 1:0:3 dark blue purple
8 colors 50.0 50.0 1:0:1 dark blue
9 colors 75.0 25.0 3:0:1 Hong Qinglian
10 colors 50.0 50.0 0:1:1 green
11 colors 75.0 25.0 0:3:1 green
12 colors 80.0 20.0 0:4:1 Apple Green
13 colors 25.0 75.0 0:1:3 dark green
B/14 Duplex 50.0 25.0 25.0 2:1:1 Brown Red
15 Duplex 66.68 16.67 16.67 4:1:1 Red Brown
16 complex color 25.0 25.0 50.0 1:1:2 olive
17 Complex color 16.67 16.67 66.68 1:1:4 dark dark green
18 Duplex 33.3 33.3 33.3 1:1:1 black (approximate)
19 Complex color 20.0 40.0 40.0 1:2:2 dark green
20 complex color 20.0 70.0 10.0 2:7:1 brown
21 Complex color 25.0 50.0 25.0 1:2:1 Bronze description: (1) 13 inter-color, actually 12 (due to both methods are dark yellow) color;
(2) Black can only be approximate;
(3) Bronze - usually known as red;
(4) Strictly speaking, the primary colors are inks that can only be selected from one color in the ink system. Because the pigments in the market are difficult to meet the requirements of the three primary colors, and the color hue of the pigments is not uniform, the color difference (value) occurs. Generally, the ink manufacturers are based on the Printed user's printing requirements, and the amount of additional complementary color manufacturing, which is the printing of color in the three primary colors (overprinting effect) called ink. Two colors are called inter-color and three or more are poly-color. However, in the ink system, there is often a certain amount of complementary colors to meet the requirements for packaging and printing products.

11. What colors affect the color cleanliness of overprinting in three primary ink printing?

E.g:
(1) When printed in yellow, the red, orange, and green inks affect the cleanliness, and the red ones are more dirty than the dirty ones.
(2) In the case of red prints, the red, orange, yellow, and green inks affect the cleanliness, and the redlines are still relatively dirty.
(3) In cyan, blue, purple, and green are the factors that affect cleanliness, and blue (hue) ink is relatively dirty.
12. What is the general preference of ink hue during color printing?
For example: (1) gold and red ink, yellowish phase, yellow after printing, so you can add a bit of red remedy; (2) big red ink, bright red color, slightly pink (or Lisol large red phase); (3) The dark red ink is darker and darker than the red, with a tendency of purple; (4) The blue light is often called Qinglian, and it is red, dark and red, and it is also called Hongqinglian; also known as Hongqinglian; It is light in color, tends to purple color, and has a relatively pure hue. It is often used as a primary color of the three primary colors; (6) yellow ink with a slight red hue and darkness; (7) pale yellow ink, with a partial color of blue, and a hue of tenderness; (8) dark blue ink, dark old color; (9) medium blue ink, slightly dark, not obvious; (10) Kong Lan ink, bright colors, bright, yellow, often used as the primary colors of the three primary colors of cool blue; Product ink, reddish hue, fresh color, with a small amount of light purple.

13. Does the binder or varnish affect the color?

The high content of linking material, the deep color, the insoluble disperse, the change in the ambient temperature and so on will directly affect the depth and darkness of the ink film after the printing and printing of the ink.

14, pigments, fillers affect the color of printing ink?

We know: different manufacturers, different production batch numbers, different proportions of pigments (specific surface area), how much stuffing material is added, the viscosity of the ink is high or low, the depth of the printing plate, the ink transfer printing rate, the pressure of printing The speed of printing, the speed of printing, the amount of additives, the probability of ink stability, etc., are all directly related to the color and brightness of a packaged printing product.

15, what is the color sequence?

The color sequence is the order of the inks at the time of printing. For example, the color sequence of the table printing ink is: white-yellow-magenta-cyan (blue)-black, and the color sequence of inks in the ink is: black- - Blue (blue) - Magenta - yellow - white.

16, what is the printing ink model?

The ink model consists of a Chinese pinyin alphabet and five Arabic letters. The letter represents the version and is located in front of the model. The five digits 1, 2 are varieties, properties, uses, etc.; 3 is color; 3, 4 are linked together as a color hue; 5 is a color number. Such as white and large red plastic film intaglio printing ink: A53801, A53663.

Attachment: Print type code: P (lithographic ink)
T (Lithograph ink)
A (gravure ink)
W (mesh version ink)
Z (special ink)
17. How does the color equation of shaded color add?
Red + Green = Yellow Green + Blue = Blue Red + Blue = Magenta Red + Green + Blue = White
18. What are the wavelengths of several colors in the spectrum?
Color wavelength range / цm
Red 770 ~ 640
Orange, yellow 640-530
Green 580-495
Blue and blue 495-440
Purple 440-400

19, how to express the color code of printing ink?

The white ink is 1, the yellow ink is 2, the green ink is 3, the blue ink is 4, the Qinglian ink is 5, the red ink is 6, the brown ink is 7, the black ink is 8, and the additive is 9.

20. What is the principle of naming printing ink products?

1, ink full name = printing type + ink type + color / ink naming principle;
2, ink color = color categories + hue + color / color naming principles;
3, the basic name of ink is still used in China's widely used name - lead printing, offset printing, etc.;
4, printing aids / dedicated juxtaposition to the same type of ink number, naming, universal = auxiliary code + use + color.



(Author: Liu poly)

Source: China Yinguang