Offset printing fountain solution composition containing composite buffer system

A technology of lithographic printing and composite buffering, which is applied in the field of lithographic printing fountain solution compositions containing a composite buffer system, and can solve problems such as poor adaptability of printing fountain solutions, deterioration of printing operation environment, and reduction of PS plate printing durability , to achieve the effect of improving the quality of printed products, storage resistance, and buffer tolerance

Inactive Publication Date: 2010-06-30
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the wide variety of water quality conditions, temperature conditions and printing machines in different regions, the adaptability of the printing fountain solution will become poor. At the same time, high-speed operation will also lead to deterioration of the printing environment, resulting in a decrease in the printing durability of the PS plate. It is necessary to replace the printing plate in time. version, thus affecting the printing speed and increasing the printing cost
[0008] 3. Product stability and environmental issues
The alcohol-free dampening solution disclosed in Chinese patent CN 101590753A only contains a buffer solution composed of phosphoric acid and disodium hydrogen phosphate; although the alcohol-free dampening solution concentrate disclosed in CN101524931A contains citric acid, phosphoric acid and dibasic hydrogen phosphate Sodium, but it's really just a buffer system
Therefore, when using it, there is a problem that the buffer performance is not good enough.

Method used

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  • Offset printing fountain solution composition containing composite buffer system
  • Offset printing fountain solution composition containing composite buffer system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Fountain solution ratio for lithographic printing: 4.0% citric acid, K 2 HPO 4 4.5%, potassium citrate 4.0%, carboxymethyl cellulose 1.0%, nonionic surfactant AEO-9 1.5%, bactericidal algaecide Kaisong 1.0%, and the rest is water. The original solution is stored for 1 year without precipitation, algae and mold growth.

[0045] Preparation of the working solution: take the stock solution of the dampening solution in Example 1 and dilute it 50 times with water to obtain a dampening working solution containing 2 wt% of the stock solution. The pH of the working solution is 5.15, and when the working solution is prepared at 1-2w%, the change of the pH value is 0.15.

Embodiment 2

[0047] Fountain solution ratio for lithographic printing: 1.3% citric acid, Na 2 HPO 4 2.2%, sodium citrate 1.0%, polyvinylpyrrolidone 1.0%, nonionic surfactant OP-10 1.0%, bactericidal algicide hydantoin 1.5%, and the rest is water. The original solution is stored for one and a half years without precipitation, algae and mold growth.

[0048] Preparation of the working solution: Take the stock solution of the dampening solution in Example 2 and dilute it 50 times with water to obtain a dampening working solution containing 2 wt% of the stock solution. The pH of the working solution is 5.23, and when the working solution is prepared at 1-2w%, the change of the pH value is 0.25.

Embodiment 3

[0050] Fountain solution ratio for lithographic printing: 8% citric acid, (NH 4 ) 2 HPO 4 6%, ammonium citrate 9%, polyvinyl alcohol (molecular weight 20000) 5%, non-ionic surfactant TX-10 2.5%, bactericidal algicide hydantoin 2.0%, and the rest is water stock solution stored for 2 years without precipitation, No algae and mold growth.

[0051] Preparation of the working solution: take the stock solution of the dampening solution in Example 3 and dilute it 50 times with water to obtain a dampening working solution containing 2 wt% of the stock solution. The pH of the working solution is 5.03, and when the working solution is prepared at 1-2w%, the change of the pH value is 0.12.

[0052] Relevant technical indicators of the dampening working solution prepared from the lithographic printing dampening solution of the present invention:

[0053] "Stock solution" in the table refers to the stock solution of dampening solution prepared according to the ratio of the components i...

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Abstract

The invention relates to an offset printing fountain solution composition containing composite buffer system, which contains two buffer systems, wherein one of the buffer systems comprises citric acid and M2(I)HPO4, and in the molecular formula M2(I)HPO4, M is K plus, Na plus or NH4 plus ion; and the other buffer system comprises citric acid and potassium citrate, sodium citrate or ammonium citrate, components are as follows in percentage by weight: 1.0-10 percent of the citric acid, 1.0-10 percent of K2HPO4, Na2HPO4 or (NH4)2HPO4, 1.0-10 percent of the potassium citrate, the sodium citrate or the ammonium citrate, and the balance water. When 1 percent to 5 percent by weight of working solution prepared with the diluted fountain solution is used for printing, the change of pH value is less than 0.35, and when 1 percent to 2 percent of working solution is prepared, the change of pH value is less than 0.25. The ultrahigh buffering property of the fountain solution can significantly help to improve adaptability and tolerance during high-speed printing operation.

Description

technical field [0001] The invention relates to a fountain solution for lithographic printing, in particular to a composition of a fountain solution for lithographic printing containing a composite buffer system. Background technique [0002] Offset printing is a kind of modern lithographic printing, which is a printing method in which the graphics and text on the printing plate are transferred to the substrate by means of rubber (blanket). The blanket plays an irreplaceable role in printing, such as: it can well compensate for the unevenness of the surface of the substrate, make the ink fully transfer, it can reduce the transfer of water from the printing plate to the substrate, and so on. The three principles of offset printing are: (1) The principle of ink incompatibility, that is, due to the incompatibility of water and oil (ink), the blank part of the printing plate is filled with water, and the graphic part is not filled with water. Effective distinction between graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N3/08
Inventor 杨春明赵伟良
Owner HUNAN NORMAL UNIVERSITY
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