Natural color kraft paper high saturation color printing process

Abstract

The invention provides a high-saturation color printing process of natural color kraft paper, comprising the following steps: S01, measuring the chromaticity of the natural color kraft paper to be printed and recording the chromaticity value; S02, performing color adjustment on the image to be printed; S03, adjusting the highlight part of the image Extract as a separate white spot color plate; S04, on the basis of the color value of the image to be printed after adjustment in step S02, subtract the chromaticity value of the natural color kraft paper measured in step S01 to obtain the image to be printed after color reduction Image; S05, performing spot color separation on the image to be printed obtained in step S04; S06, making a large version of each color separation sheet obtained in step S05, and outputting a printing plate; S07, using printing plates of various colors and spot color inks and The cyan, magenta, yellow and black inks are printed on the corresponding color groups of the printing machine, and the inks of each color are transferred to the natural color kraft paper to complete the printing. The invention has the beneficial effects of improving the reproduction effect and color saturation of the printed image of natural-color cowhide.

Description

technical field [0001] The invention relates to a printing process, in particular to a high-saturation color printing process for natural color kraft paper. Background technique [0002] Kraft paper, used as packaging material, is very strong, usually yellowish-brown in color, and semi-bleached or fully bleached kraft pulp is light brown, cream or white. It is difficult to obtain better color reproduction in kraft paper printing, especially to accurately achieve color reproduction on ordinary kraft paperboard, which is more difficult than printing on bleached kraft paperboard. Due to the interference of the color of kraft paper itself, in After each color ink is superimposed on the kraft paper, the printed color image is obviously darker and cannot show high-saturation colors. Therefore, it is necessary to study a more suitable technology for high-saturation color printing on kraft paper. Contents of the invention [0003] In order to solve the problems in the prior art, ...

AI Technical Summary

Problems solved by technology

It is difficult to obtain better color reproduction in kraft paper printing, especially to accurately achieve color reproduction on ordinary kraft paperboard, which is more difficult than printing on bleached kraft paperboard. Due to the interference of the color of kraft paper itself, in After each color ink is superimposed on kraft paper, the printed color image is obviously darker, and it cannot show high-saturation colors. Therefore, it is necessary to study the technology that is more suitable for high-saturation color printing on kraft paper.