Fountain solution high quality printing protection

With the development of the overall level of science and technology, printing equipment is continuously improving in terms of quality, grade and automation, laying a good foundation for improving the quality of printing. "Good horses are equipped with good saddles." In addition to the need for high-speed, high-efficiency printing equipment, printing materials, including paper, ink, plate materials, and fountain solutions, must also meet their requirements in terms of quality and performance. In offset printing, due to the increase of printing materials and ink types, and the expansion of drying methods, there are more specific requirements for the fountain solution that is indispensable in offset printing. Its quality and performance will directly affect the quality of printing products and equipment and related equipment. Usage.

The role and classification of fountain solution

The whole process of offset printing is related to the fountain solution. The purpose of using the fountain solution: 1 Form a uniform water film on the non-graphical part of the printing plate to maintain the ink repellency of the non-graphical part of the printing plate; 2 Supplementary printing process The destroyed hydrophilic layer maintains the hydrophilicity of the non-graphic part of the plate and reduces the temperature of the plate; 3 prevents the dirty plate.

Offset fountain solution is generally divided into ordinary fountain solution, alcohol fountain solution, surfactant fountain solution three. The chemical components added to common fountain solution include inorganic compounds such as phosphoric acid, phosphate, and nitrate, which have the characteristics of high surface tension and low cost; the alcohol fountain solution is added with ethanol, isopropanol, or other alcohols. With low surface tension and good wettability, it is suitable for lithographic printing machine equipped with alcohol wetting system. Surfactant fountain solution contains a certain amount of surfactant, which has the characteristics of low surface tension and good wetting properties. It is an ideal fountain solution for high-speed multi-color lithographic printing presses.

Fountain solution features

The current better fountain solution should have the following characteristics:

1. The pH of the fountain solution is stable at 4.3 to 5.5 (the amount of fountain solution is 2% to 3%);

2. It is more suitable for high-precision printing, good reproducibility of dots, rich prints and colorful colors;

3. Add plasticizers properly to change the phenomenon of dirty plates due to excessive speed during high-speed printing;

4. The standby time should be as long as possible, be stable in a class (8 hours), and can be printed continuously without adjusting the water supply system;

5. Reduce the wear of the PS plate in the printing process, prolong the life of the PS plate, and increase the printing plate resistance to printing.

6. Does not produce mold and clog machine waterways;

7. Relatively reduce the amount of alcohol;

8. No crystallization;

9. There should be different products for different printing materials and drying methods.

At present, the fountain solution that meets the above conditions in the domestic market is almost entirely an imported product. Although the quality is relatively high, it is expensive, and for some users, choosing a high-quality fountain solution may cause concern. Therefore, the production of fountain solution adapted to new equipment, high quality, and low price will be more suitable to the needs of the market.

Beijing Huashang Economic & Trade Co., Ltd. is a company mainly engaged in the production and import of imported printing materials. It is precisely this point that has been made, timely introduction of the latest high-efficiency dampening fluid, and is divided into flat sheets according to printing methods and ink properties. There are three types of thermosetting and news. News printing fountain solution is mainly used for newspaper printing, and thermosetting fountain solution is mainly used for high-end commercial rotary printing such as coated paper and light coated paper. In addition, anti-static liquid has been added to the two fountain solutions to avoid electrostatic phenomena caused by the fountain solution. In terms of price, adapting to the needs of domestic users, compared with imported products of the same grade, it can be said to be cheap.

Source: "Printing Technology - Equipment and Special Printing"