Hydrophilic dispersion liquid and printing plate base adopting the dispersion liquid

Abstract

The invention discloses hydrophilic dispersion liquid and a printing form base which utilizes the dispersion liquid. The hydrophilic dispersion liquid of the invention includes organic components and inorganic components, wherein the organic components comprises hydrophilic elements and a surface activator, and the organic components take 30% by weight to 60% by weight and the inorganic components hold 40% by weight to 70% by weight in the hydrophilic dispersion liquid. The printing form base of the invention comprises a base, wherein at least one lateral surface of the base is provided with at least one hydrophilic layer which is made from the hydrophilic dispersion liquid of the invention.

Description

technical field [0001] The present invention relates to a hydrophilic material for printing substrate and the printing substrate, more specifically, the present invention relates to a hydrophilic dispersion liquid and a lithographic printing plate base using the dispersion liquid. Background technique [0002] Lithographic printing technology is the main printing technology commonly used in the printing industry at present, and the most commonly used ones are PS technology and CTP technology. [0003] Both PS technology and CTP technology use the principle of oil-water separation for printing. That is, during the printing process, all the non-graphic parts of the surface of the printing plate base are evenly covered with water. When the printing ink is supplied to the surface of the printing plate base, the non-graphic parts covered by water cannot be stained with printing ink, so the printing ink It can only be spread on the graphic part, so that the graphic part covered w...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the existing PS printing technology has many disadvantages as follows: 1. It is necessary to carry out acid treatment and electrolytic anodizing treatment on the substrate, and the production process has high power consumption, high water consumption, low vehicle speed and low efficiency, which not only increases the manufacturing cost , and will cause serious pollution to the environment; 2. After many times of printing, the traditional PS printing plate base often appears dirty on the non-graphic parts, so the current general PS printing plate base has a short service life. In the production process of the traditional PS printing plate base, it is generally made hydrophilic by corroding and anodizing the substrate. The main component of the hydrophilic layer formed by this corrosion is Al, which itself is not excellent in hydrophilicity. 2 o 3 , Wear and tear will occur after repeated use, which will reduce the hydrophilicity, and the hydrophilic surface of the printing plate base will easily lose its hydrophilicity during use. In addition, the photosensitive layer will be developed after exposure to remove the unexposed photosensitive layer. 3. The hydrophilicity of the traditional PS plate is not good enough. At present, most printing factories use special dampening solution to achieve oil-water separation. , the main components of the fountain solution mainly include organic solvents, water and hydrophilic resins, etc., which invisibly increases the printing cost; 4. Because the traditional PS plate has high requirements on the corrosion resistance of the substrate, and must go through the anodic oxidation step Form a hydrophilic layer, so the requirements for the substrate are strict and must be aluminum with high purity

However, not only the independent claims of the No. 02128955 patent application cover the prior art (such as the No. 86101022 patent), but also from the technical solutions provided in its description, it can be deduced that the hydrophilic layer described in the No. 02128955 patent application is actually not feasible in application

First of all, the combination of the hydrophilic layer and the printed graphics is seriously insufficient, so after a limited number of printings, the printed graphics become blurred; The binding force is also seriously insufficient, and it is easy to fall off from the printing plate, and even the hydrophilic layer and the graphic part fall off together; in addition, the hydrophilic performance of this hydrophilic layer is not good, so some ink will cover the hydrophilic surface, As a result, the part that should be blank is "dirty"; in addition, the printing plate used is limited to metal materials, and the thickness is relatively large, which not only increases the manufacturing cost, but also makes the printing plate not flexible enough, and increases the shipping cost

Images