Improve printing quality to choose good fountain solution

Editor's note: In offset printing, due to the increase in printing materials and ink types, and the expansion of drying methods, there are more specific requirements for the indispensable damp-printing lotion in the offset printing, and its quality and performance will directly affect the quality and equipment of the printed matter. The use of related equipment.

For offset printing, the fountain solution is a non-negligible link. According to the principle of ink-water balance, the amount of water supplied to the printing plate is controlled to a minimum that cannot be dirty in the blank portion of the printing plate. In particular, the pH of the fountain solution directly affects the printing quality, the drying speed of the ink, and the interfacial tension. Therefore, to understand the characteristics and performance of the fountain solution, select the appropriate fountain solution to ensure the normal printing.

First, the characteristics of fountain solution

The current better fountain solution should have the following characteristics:

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

2. It is more suitable for high-precision printing, with good dot reproducibility, rich print layers, and bright colors.

3. Appropriate plasticizer is added to change the phenomenon of dirty plate due to excessive speed during high-speed printing;

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

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

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.

Second, the correct use of fountain solution

In the use of fountain solution should be properly selected PH value, mainly based on the ink's pigment, oiliness, viscosity, fluidity, acid resistance and other properties, and the difference between the substrate to print the structure of printing and other factors to choose Different pH value fountain solution.

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. As a result, the production of high quality, low cost fountain solution will adapt 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 timely launched the latest high-efficiency fountain solution and classified it into three types according to printing methods and ink properties: flat sheet, thermosetting and news. . News printing fountain solution is mainly used for newspaper printing, and thermosetting fountain solution is mainly used for coated paper, light coated paper and other high-end commercial rotary printing. 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, it also meets the needs of domestic users. Compared with imported products of the same grade, it can be said to be cheap.

According to sales personnel from China, the user chose a good fountain solution, not only saving the cost of supplies, but also improve the quality of printing.

Source: HC Business