Printing ink color matching method

In the printing iron work, whether it is a multi-color machine or a monochrome machine, ink color deployment is a high-tech work. Iron printing ink is a kind of special ink. In order to meet the conditions of printing and high-temperature baking of metal printing, comprehensive consideration must be given to the choice of pigments and binders. If operators do not understand the performance and color knowledge of printing ink, then the bright ink, mixed out can not achieve the desired appearance and quality level.

The nature of Indian iron ink

Each color has three attributes of hue, lightness, and saturation. Hue can be expressed by the wavelength of light waves, that is, the wavelengths reflected by different colors are different. Brightness indicates the degree of lightness of the color, and lightness of the ink indicates the amount of light reflected by the ink. Saturation refers to the purity of the color. If an object has a high reflectance of light in a certain wavelength band in the spectrum and the reflectance of light in other wavelength bands is low or absent, the purity of the color is high.

Ink ink pigments usually account for 10% to 35% of the ink composition. The amount of pigment determines the ink concentration, and also has a great influence on the relative density, transparency, heat resistance, and light resistance of the ink. In the ink color matching process, the ink should be selected according to elements such as the printing process, ink layer thickness, and the properties of the print, and the properties such as luster, hue, tinting power, and hiding power of the ink must also be considered.

1. Luster: refers to the ability of the ink to reflect light in the same direction after exposure to light, which directly affects the appearance of the print. It can be measured with a gloss meter or with the naked eye.

2. Hue: is the basic characteristics of color, color matchers must first consider whether the hue is the same. The detection method is: comparing the standard sample with the naked eye by scraping the scrap paper or simulating the method of printing iron, and observing whether the hue is the same.

3. Covering power: refers to the ability of the ink to cover the background. The better the hiding power, the lower the transparency. The level of transparency directly affects the ink trapping efficiency and the degree of influence of the affected parts.

4. Coloring power: used to indicate the concentration of ink. The determination method is as follows: a certain amount of ink is added with a certain amount of standard white ink to dilute, and compared with the standard sample. The strength of coloring reflects the relationship between the ink mixing degree and ink film thickness.

Luster, hue, hiding power can be identified by scraping paper scratching test, the specific operation is as follows: Put the standard ink in the upper left corner of the scraping paper, and put the color ink in the upper right corner, make the standard scraper and the scraping paper into a vertical angle force flattening Thinly applied part, gently compressing the thick part at an angle of inclination. After the surface of the ink is dried, the hue of the ink is observed in the thin layer portion, the gloss difference between the two inks is observed in the thick portion, and the hiding power (transparency) of the ink is identified in the black portion (ground) portion. Normally, black or color inks use white scratch paper, and white ink uses black scratch paper. The color samples were observed under indirect indoor light sources during the day and under standard light sources at night.