A kind of sealing agent for CTP plate material sealing and using method thereof

Abstract

The invention discloses a hole sealing agent for hole sealing of a CTP plate. The hole sealing agent is composed of, by mass, 5%-15% of main agents, 0.2%-3% of assistants and the balance water, wherein the main agents are one or more of sodium acetate, nickel acetate, cobalt acetate and strontium acetate, and the assistants are one or more of citric acid, phosphoric acid, sodium fluoride and sodium dihydrogen phosphate. The hole sealing agent is moderate in price and convenient to operate and control, and the performance of screen dot reduction, hydrophilicity, pressrun and the like of the CTPplate subjected to hole sealing treatment through the hole sealing agent is excellent. The invention further provides a using method of the hole sealing agent for hole sealing of the CTP plate. The hole sealing agent prepared from the raw materials is sprayed on an anodized aluminum plate for 5-25 s at the temperature of 35-55 DEG C, then the aluminum plate is cleaned through deionized water, andthus hole sealing treatment of the aluminum plate is completed. Operation is easy, and a shutdown staining failure widely occurring in existing CTP plates can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of sealing agents for printing plates, in particular to a sealing agent for sealing CTP plates, and also relates to a method for using the sealing agent for sealing CTP plates. Background technique [0002] The basic principle of lithographic offset printing is "oil-water immiscibility". The key to manufacturing this plate is to establish a stable aluminum-based hydrophilic layer and a photosensitive lipophilic layer. At present, the process adopted in the production of CTP plates for lithographic offset printing is roughly as follows: [0003] Aluminum plate - degreasing treatment - electrolytic sanding treatment - oxidation treatment - sealing treatment - coating photosensitive solution - drying treatment - cutting and packaging; the sealing treatment is to oxidize the surface of the anodized aluminum plate by chemical or physical methods The micropores of the membrane are treated to adjust its surface ad...

AI Technical Summary

Problems solved by technology

Although the above three schemes can all realize the sealing treatment of the anodized aluminum plate, they generally have different defects, such as: using fluorozirconate or fluorosilicate for sealing treatment, and the sealing is not easy to control , it is easy to cause over-sealing, which reduces the hydrophilicity of the surface of the aluminum plate; the use of fluoride for treatment is likely to cause problems such as "coating white spots" in the coating process of the aluminum plate; the use of PVPA for sealing, the price of the main raw materials is expensive and controlled Difficult, high production cost; using sodium silicate to seal the hole, the sealing time is too long, and crystallization is easy to occur, so the rapid production of CTP plate cannot be realized

Sealing with water vapor is complicated and consumes a lot of energy

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