Method for printing on-site and transitional-layer images and texts in color-overlapped manner by gravure plate

Abstract

The invention provides a method for printing on-site and transitional-layer images and texts in a color-overlapped manner by a gravure plate. The method comprises the following steps: firstly printing on-site and transitional-layer dot images and texts and printing large-area on-site images and texts and basic transitional layer dots, wherein a gravure plate is made in an on-site-to-highlight transition manner, and ink cell angles are square dots; and overprinting transitional-layer dot images and texts, wherein the transitional layer dots of the gravure plate are made in a manner of highlight-to-middle tone-to-highlight transition, and ink cell angles are elongated dots. With the application of the method, a gravure press can be used for successfully printing products with on-site and transitional-layer images and texts in one time, the traditional printing manner combining gravure with offset printing is not used, and the application scope and the production efficiency of the gravure technology can be improved effectively.

Description

technical field [0001] The invention belongs to the technical field of printing processing, and in particular relates to a method for printing solid-field and transition-level graphics and texts with a gravure printing machine. Background technique [0002] The traditional printing of transitional layers of graphics and texts can only use lithographic offset printing, and gravure printing is mostly used for solid printing. [0003] The lithographic printing process is mainly offset printing. After the offset printing plate is inked, it is transferred to the substrate through the intermediate rubber cylinder. The graphic part and the blank part of the offset printing plate are almost on the same plane. The thickness of the printing ink layer is about 1 ~ 4um, which is a traditional It is a printing and processing method of transitional graphics and texts, but it is slightly less expressive to solid graphics and texts. [0004] The gravure printing process is to apply ink to ...

AI Technical Summary

Problems solved by technology

[0004]The gravure printing process is to apply ink to the graphics and texts below the blank part of the printing plate, and remove the excess ink with a scraper. Under the action of printing pressure, the ink Transferred to the substrate, the gravure printed graphics and text are concave into the printing plate, and the amount of ink stored is large. The graphic and text ink layer obtained after embossing is thick, rich in layers, and the ink color is bright. The thickness of the printing ink layer is about 20 ~ 40um , gravure printing is generally used for solid graphic printing, but transitional level graphic printing cannot be achieved

At present, there are three printing methods for printing on-site plus transitional level graphics and texts: one is to directly use the unit-type sheet-fed offset printing machine to print, but the printed matter that requires higher on-site effects is slightly insufficient, and the printing speed is relatively slow. Imported equipment About 15,000 pairs / hour, equivalent to about 150m / min; the second is to use the combination of gravure printing and offset printing, first complete the solid graphic printing on the gravure printing machine, and then print the transitional layer graphics and text on the offset printing machine, and the printed matter needs to be circulated in two processes , the efficiency is relatively low, and waste products are generated; the third is to install an offset printing unit on the gravure printing machine, or add a gravure printing unit to the offset printing machine to achieve one-time printing. The disadvantage is that the transformation cost is high and the cycle is long

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