Multi-color screening printing method

Abstract

The invention discloses a multi-color screening printing method. According to the method, the four kinds of colors including C, M, Y and K serve as main basic colors according to the number of color cells of a printing machine and the variety of colors of products, and three or less than three colors are selected from four colors including O, G, B and V to serve as auxiliary basic colors; a screening method is determined to be amplitude modulation screening, the screen line number is 133-200 L / inch, and the screening angle is that the four main basic colors including C,M,Y and K are distributed at 90 degrees and the screening angles of all the selected auxiliary basic colors are the same as that of the color K. The four main basic colors including C,M,Y and K and the three or less than three auxiliary basic colors selected from the four colors including O, G, B and V replace the four main basic colors including C, M, Y and K and special colors for multi-color screening printing, the special colors do not need to be made specially, viscosity adjustment does not need solvents in the printing process, and the method has the advantages of saving printing ink, reducing the number of workers and saving work hour and overcomes the defect of moire.

Description

technical field [0001] The invention belongs to the technical field of printing and relates to multi-color printing in which colors other than CMYK (cyan, magenta, yellow and black, hereinafter referred to as CMYK) participate in image color separation. Background technique [0002] Traditional printing (such as gravure printing and flexo printing) generally uses CMYK four-color plus spot color for color separation printing, and each spot color is a unique color, which needs to be replaced with product replacement in actual production. [0003] When each different product is replaced, it is necessary to replace all colors, or inks of spot colors other than CMYK four colors, ink trays, membrane pumps, scrapers, anilox rollers (flexo printing), printing plates and other printing auxiliary materials. It not only wastes ink and cleaning solvent, but also seriously wastes the working hours and unnecessary labor of printing presses. [0004] Since each spot color is a special mat...

AI Technical Summary

Problems solved by technology

[0003] When each different product is replaced, it is necessary to replace all colors, or inks of spot colors other than CMYK four colors, ink trays, membrane pumps, scrapers, anilox rollers (flexo printing), printing plates and other printing auxiliary materials. It not only wastes ink and cleaning solvent, but also seriously wastes the working hours and unnecessary labor of printing presses.

[0004] Since each spot color is a special matching color, the spot color ink needs to be continuously mixed with consumption during the production process, and solvents are continuously added to adjust the printing viscosity. Differences in ratio formulation and viscosity adjustment fluctuations lead to obvious color differences in products, resulting in waste

[0005] Every time an order is replaced, the old ink accumulates more and more, which not only takes up a lot of storage space and funds, but also needs to scrap a batch of old ink that is really unusable every year, causing substantial economic losses