Printing, as a kind of image and character reproduction technology, its social significance lies in that it records and spreads the corresponding history and culture while reproducing words and images. Therefore, the country where printing technology first appeared must be an ancient country of human civilization. Printing, as a practical technology for reproduction, was invented by the Chinese people, and the well-known seal is its early prototype. What factors affect the color difference of spot color printing? Let's talk about it today.
1. The influence of paper on color
Glossiness and smoothness: the glossiness of printed matter depends on the glossiness and smoothness of paper. The surface of printing paper belongs to semi gloss surface, especially coated paper.
On color printed matter, when the light rays irradiate the paper surface at an incidence angle of 45 degrees, about 4% of the light will be reflected, which is the reflected light from the first layer surface. And the rest of the incident light through the ink layer, after the selective absorption of the ink, and then through the ink layer reflection, into the human eye, perceived by the human eye, this is the color we observed. If the glossiness and smoothness of the paper is high, the light reflected from the surface of the first layer is specular reflection, which is not easy to enter the human eye. At this time, the color observed is basically the color reflected through the ink layer.
2. The effect of diluent on color
Diluent is a kind of colorless transparent substance in the form of oil paste, which mainly plays the role of diluting color in spot color printing. The effect of diluent on hue is different, especially blue.
The above factors affect spot color printing color difference, in addition, just printed, ink is still in wet state, and dry state when there is a density difference. The phenomenon that wet color density is greater than dry color density is called dry density phenomenon. This is because the newly printed ink layer has a certain leveling, so the surface reflection is mainly specular reflection, which looks bright and glossy.濟南印刷廠講解的內容 更多的內容 請咨詢公司官網http://www.703248.com/