Black-gray four-color offset printing ink

Abstract

The invention discloses a black-gray four-color offset printing ink which comprises a red black ink MK, a blue black ink CK, a yellow black ink YK and a pure black ink BK used as four-color inks for printing, wherein the CIE Delta Lab values of the four-color inks are as follows: red black ink MK (L=49.64+ / -3, a=0.1+ / -5, b=-1.95+ / -5), blue black ink CK (L=66.66+ / -3, a=2.99+ / -5, b=4.06+ / -5), yellow black ink YK (L=76.08+ / -3, a=0.99+ / -5, b=5.74+ / -5) and pure black ink BK (L=10.96+ / -3, a=0.34+ / -5, b=0.33+ / -5). The black-gray four-color offset printing ink has pure color and can obtain a pure black-white picture; and compared with the traditional four-color, the presswork does not have any dithered color. The invention can not result in impure color of the black-white presswork due to the problem of the traditional printing technique; and the invention satisfies the requirements for printing effects, implements the black-gray image printing of slightly warm tones or cool tones or other tones, and supplements the reduction of fine details.

Description

technical field [0001] The invention relates to the technical field of printing, in particular, the invention relates to an ink specially used for black and gray four-color offset printing. Background technique [0002] Throughout today's printing industry, four-color offset printing technology is still the most common type of high-end commercial printing in the printing industry today, but with the development of cultural undertakings and people's artistic taste, high-style, high-grade printing technology is becoming more and more popular. Loved and admired by many people. The black and white image printing technology is a major breakthrough in the field of black and white printing. With its unique charm, it makes the black and white effect more cohesive, concentrated, and simple, making people feel more intimate, natural, simple, and more subtle. [0003] At present, black and white printing uses black and gray two-color ink and normal four-color ink to print. This metho...

AI Technical Summary

Problems solved by technology

[0003] At present, black and white printing uses black and gray two-color ink and normal four-color ink to print. This method is relatively simple for color separation of the original manuscript before printing, but for printing, gray balance control is extremely difficult, resulting in failure to catch up with the color Unable to meet the needs of the majority of customers, and lead to waste of materials and low production efficiency

[0004] Using traditional yellow, magenta, cyan, and black printing inks can print black and white four-color printing effects, but due to the usual color separation method used in pre-press color separation, the CMY plate is overall heavy, resulting in partial layering and level loss , which is not very suitable for black and gray images, and it is difficult to follow the color during the printing process, which greatly reduces the printing efficiency. At the same time, the traditional four-color printing method of yellow, magenta, cyan, and black has relatively poor color stability. Especially for the restoration of black and white images, it is very easy to have color cast

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