According to the comprehensive consideration of plastic properties, molding process, toner characteristics, color matching principles, product requirements, etc., various colors are mixed to meet the required color requirements. Any color has a certain hue, a certain brightness, and a certain saturation. By changing these three factors, tens of thousands of colors can be called up. Therefore, in color matching, mastering the three techniques of shading, toning, and toning are the most basic techniques. The principle of toning is to adjust the shade first and then the hue, because the hue will definitely change as soon as the shade changes.
Second, the depth of adjustment
According to the target sample, observe the degree of analysis, the shade of the hue, determine the proportion of black and white in the composition, and determine the concentration of the color toner or the proportion of the fluorescent toner in the color. The coloring power of the toner can be confirmed with various toners on the same plastic substrate. For example, there is sufficient certainty about the difference in the actual color level of PP materials such as 20 grams, 50 grams, 100 grams, and 300 grams. At the same time, it is necessary to grasp the change of hue and concentration of each color pigment by adding a certain proportion of titanium dioxide.
In the process of toning, in the deep direction, it is necessary to clearly distinguish whether the hue is deep or dark based on the color and light. The hue can only be added with toner, and the black can be added with black. concentrated. In the light direction, first determine the amount of titanium dioxide according to the degree of solid color. If the solid color is not enough, add titanium dioxide. At the same time, add other toners in proportion. Then according to the depth of the hue and the color of various colorants. Tinting power, estimate the proportion of coloring agent.
Third, the color phase
Theoretically, most of the colors can be matched with the three primary colors of red, yellow, and blue, but in fact, the colors of various colorants are not simple colors, but are between simple colors with a color light of adjacent colors. For example, red color powder has yellow light red and blue light red, blue color powder has red light blue and green light blue, and yellow color powder has green light yellow and red light yellow. In the process of color matching, we must pay attention to the complementarity of the color light. For example, when adjusting bright green, you can directly use phthalocyanine. Red light blue and green light yellow to match colors.
Fourth, the color difference
After the shade and hue are estimated, the basic formula can be determined. After punching, the color is matched with the standard sample, and then the color difference is corrected. Chromatic aberration is related to the bias of shades, vividness, brightness, and hue.
First of all, determine the color difference. The lightness and darkness are adjusted by black and white powder. The brightness and brightness are adjusted by increasing or decreasing the amount of toner or adding fluorescent toner and whitening agent. The hue bias can increase or decrease the amount of this toner or adjust it with the complementary color relationship, but it should be noted that careful use of complementary color will make the color darker.
How to determine the color mixing formula?
First determine the content of titanium dioxide, which is the key to the technology. Because, as the content of titanium dioxide changes, the color will change greatly, and the amount of other toners will change accordingly;
The color range of the color matching sample is analyzed by which colors, which is the main color and which is the sub color. (Try to choose a pigment that is similar to the color of the sample. For example, if the color is red, the sample will be yellow if it is yellowish, and bright red or fluorescent red as the main color).
Observe the vividness of the sample and consider whether to add fluorescent toner or whitening agent.