Printing printmaking method and printing plate thereof

Abstract

The invention provides a process for the manufacture of printing master, and a printing master made thereby, wherein the process comprises, using an ink composition capable of optical polymerization reaction under light illumination, which includes monomer used for optical polymerization reaction, optical polymerization initiator, coloring agent and organic solvent, to print the pattern directly onto the printing image base through high precision ink-jet printers. As the result of light struck, the ink expediting setting on the printing master can be achieved. The advantages of the process according to the invention are, no ink overflow to the periphery, clear image, and simple salting-on procedure.

Description

technical field [0001] The invention relates to a printing plate-making method, in particular to a method for preparing a printing plate by ink-jet printing, and a printing plate obtained by the method. technical background [0002] The traditional color printing plate-making method mainly includes the following steps: (1) First generate a general printing file, such as a PS file or a PDF file, from the printed image and text in the computer, (2) perform color separation processing on the file (RIP interpretation) , use a laser phototypesetting machine to expose the phototypesetting film, and then develop, fix and wash to make a printing film; (3) use manual imposition to press the film on the PS plate or other photosensitive plates, and use ultraviolet light to expose the plate, After development, a multi-color printing plate is made, and a color printing sample is obtained after multi-color ink overprinting on a traditional proofing machine; (4) After the printing sample i...

AI Technical Summary

Problems solved by technology

However, there are still two major defects at present: one is that because the existing inkjet printer ink is basically water-soluble, when the printing paper adopts coated paper or other smooth paper, the printing is prone to overflow, and the printed image is not clear , the effect is not good, and it can only be printed on special printing paper or imitation coated paper, so there is a problem that the printing sample paper is inconsistent with the printing paper, resulting in differences between the printing sample and the printing product; the second is that the printing sample is passed through high-precision Inkjet printers print, while the printing plates used for printing are made by direct plate-making machines, and the dots generated by the two machines are different.

The above two defects will inevitably bring about difficulties in color correction, causing conflicts and disputes between printing companies and customers, and bringing unnecessary troubles and losses to the company

At the same time, when the direct plate-making machine produces a printing plate that can be printed on the machine, it needs to be developed, which generates sewage

[0004] Chinese patent CN1145152A discloses a computer-to-plate method, which uses an inkjet method to spray lipophilic resin on the surface of a hydrophilic metal plate. The printing ink used in this method is different from ordinary ink. In a volatile organic solvent, rely on the volatilization of the solvent to dry the polymer resin to form a film on the metal plate after printing, but according to the inventor's repeated tests, this plate-making method has serious ink loss on the high-precision ink-jet printer. Clogging and blurry images when printing on glossy aluminum plates