1, ink color
The color of the printing ink depends on the choice and composition of the pigment. Humans have developed new ink color varieties and improved the quality of traditional color hue for the needs of commodities and commodity packaging.
The color of the ink on the substrate is often constrained by its own chroma and ambient light. Such as the standard light source is green, red, white and so on. However, if the ambient light or the irradiation conditions change, such as a red light incident on the white ink ink film, the white package printing ink will be colored red. The color of the surface decoration of any kind of packaged printing object is not visible. Based on the knowledge of color chromaticity and other knowledge, the law of the color change of the ink film should be continuously studied in order to print a good product.
2. The concept of metamerism in printing and decorating
To meet the needs of packaging printing ink color varieties, only a few colors are not enough. Must go through a certain color matching process in order to get the requirements of the finished series of colored ink in the market. A new color hue is obtained by the printing of the multi-color or multi-color, which not only conforms to the normal packaging and printing rules, but also conforms to the color matching rules.
In order to achieve the above requirements, the concept of metamerism color was proposed. Spectral distribution of different ink color samples is very important for color packaging printing ink color matching. That is, different ink colors can be used to formulate the same ink color variety. In actual color matching can only reach a certain degree of approximation, and can be assessed by the spectral reflectance factor curve shape. The more similar the reflectance factor curves of the two samples are, the more coincident and the more intersecting points are, the more the color hue of the prepared sample can be proved to be close to the sample. You can also perform quantitative analysis by calculating the difference in chroma between two ink samples. Show how much of their homochromism.
3, the basic knowledge of color deployment
In the packaging printing ink system, the binder is colorless or has a micro-colored liquid, and the refractive index and water are close to each other, so the binder has a certain degree of transparency. When the pigments and fillers are added, the light and light are blocked due to the color and the filler. Human, which leads to a change in the optical properties of the ink.
When daylight enters the yellow color ink ink film, it means that it absorbs the blue spectrum of sunlight and emits yellow and green light. When the reflected yellow and green light encounters the blue pigment particles, the blue light reflected by them tends to absorb only the green light. After a series of reflections and refractions, only the green ink ink film is reflected. Therefore, we say that the color mixing of the printing ink colors is subtractive mixing (receiving each other's desired wavelengths and not being reflected by the absorbed spectrum), which is the origin of mixed colors (or polychromatic colors).
In China's packaging printing ink industry due to the use of the principle of subtraction, so the use of three primary color complementary.
We use a variety of printing ink color shades to reconstruct many colorful ink colors.
If the color of the package printing and decorating design is fully conceived, from the three primary colors of yellow, magenta, and blue to three colors of red, green, blue, and then to four-colored purple, bronze, olive green, black, Can be combined into a new form of expression, as people already know if the different ink color hue (hue), different ink lightness and different ink color saturation combinations together, it will also give a beautiful soft And the feeling of harmony.
Looking at the color of the domestic and international packaging printing ink color cards, with the exception of the three primary colors, the vast majority are composite colors. The deployment of complex (combined) colors is itself a color science, and the color of the prepared packaging and printing is ultimately based on our visual inspection. To verify its effectiveness, good, bad and pros and cons. The use of packaging and printing to decorate the color of the goods we need, decorate a dazzling array of colors, and constantly adjust the work and living environment, will give people a positive stimulus, is conducive to work and quality of life.
There are several colors in the packaging and decoration of the same environment, so the coordination between colors is always the subject of our research. Such as complementary (red and green) colors (two colors equal to white), sometimes with a bad taste will give people a tacky feeling, with a good deployment, will give people a strong and eye-catching feeling. Light yellow with reddish-brown, due to the close color between yellow and red, the similar color gives a harmonious beauty. There is also a combination of dark green and light green, fresh and dazzling. Using the method of achromatic and color matching at the same time, it gives people a bright feeling and protects eyesight. When the red, white and blue colors are the same, they appear on a single package, giving people the impression that the red is warm, the white is pure, and the blue is dignified, reflecting the beauty of a commodity material.
Although China had already established China's color chromatography as early as the 1950s, and classified more than 4,000 varieties in 56 enterprises into the unified P, T, A, W, Z and other five types of 86 printing inks, and successively A total of 29 testing standards have been formulated. In addition, the printing ink color cards of various packaging and printing ink factories are promoted and distributed in various packaging printing companies. As a packaging printing and printing ink designer and worker should not be limited to the existing ink color card and hue range, but can often use The Munsell color map physical catalogue of Chinese color system is combined with the color matching of electronic computers to gradually satisfy the purpose of different requirements that users increasingly propose.