The basic requirements for newspaper printing are: first, to be time-efficient, to provide newspapers for the majority of readers at the fastest speed; second, to meet quality requirements, to have clear graphics, bright colors, and good visual effects; and third, to be economical, Under the premise of meeting basic requirements, minimizing costs should be minimized. The fourth should be environmental protection. Under the condition that the international community is increasingly demanding environmental protection, the basic conditions for meeting the requirements of environmental protection should be printed. Below, we will make a brief analysis of offset printing and talk about offset printing.
1.Adjusting the structure of newspaper printing At present, in our country's newspaper printing, it is almost the world of offset printing. Regardless of the size and amount of printing, all use offset printing. While Europe and North America broke the single pattern of offset printing in the 1990s, we should also rationally choose the printing method based on specific circumstances. For example, the cost of offset printing for newspapers with tens of thousands of copies will increase significantly. At this time, different printing methods can be selected according to different requirements.
2. High paper loss rate and reject rate is a prominent problem in offset printing. In offset printing, controlling the ink-water balance is an important issue, and achieving ink-jet balance in offset printing requires a process. Under normal circumstances, it takes about 15-30 minutes to adjust and test the printing stage from the time of starting up to enter a stable working state, which will inevitably increase the loss rate. In the offset printing process, there are many factors that affect the ink-water balance, and most of these factors are changed. Even under normal printing conditions, waste products may appear due to changes in certain conditions. For example, the loss rate of sheet-fed four-color offset presses is generally as high as 7%-15%, and the loss rate of web offset printers is even higher than that of sheetfed offset presses. Therefore, from the economic point of view, offset printing is not the best.
3. Offset printing does not have much advantage in the quality of printed products. Offset printing has a high quality and is based on many conditions. If the surface properties of the printing materials are high, fine prints can only be printed when higher-quality, higher-quality coated paper is used. Printing on newsprint is prone to the following problems: (1) offset printing uses fountain solution, and newsprint paper is highly water-absorptive, and the whiteness of the paper will decrease after absorbing water; (2) the surface roughness of the newsprint will affect the clarity of the text. (3) In the printing process, it is easily affected by external factors, and the printing quality is poor in stability. It is prone to defects such as uneven ink and dull colors.
4. Offset printing is at a disadvantage in terms of environmental protection Offset printing ink is a low viscosity solvent ink. The solvent content of the ink is relatively high. Without the oxidation of the conjunctiva catalyst, it is directly absorbed by evaporation and evaporated by heating. It is difficult to print for hours. When it is fully dried, it not only causes troubles in the printing process, but when the reader gets the newspaper, the dry ink will stick to the hand. In addition, solvent-based inks have a strong odor, which is detrimental to both the operator and the reader. In addition, volatile organic solvents in the ink are contaminated by the environment. Therefore, rotary offset printing ink is a contaminating ink and its use should be gradually restricted.
5. Offset printing has certain requirements for paper. Offset printing has a higher printing speed and uses fountain solution. If the paper is too thin, it may cause breaks. Therefore, the paper used for offset printing should not be too thin, and should not be less than 52 g/m2 in general, which will also increase the cost of printing products.
6. Offset has higher requirements on the technical level of operators. Because the structure of offset press is more complex, the adjustment position is the most among various types of printing presses, and the control of ink balance is difficult to grasp, so the technical level of the operator There are higher requirements in terms of basic knowledge and skills. According to reports, in the offset printing industry, less than one-third of the basic requirements of the lead printer can be seen, it is obvious that it is difficult to cultivate a relatively good offset printing machine.
In summary, in the past 10 years, China's newspaper printing has achieved offset printing, and offset printing has played a significant role in the development and progress of China’s newspaper industry. However, with the rapid development of printing technology, the use of offset printing in newspaper printing is not the best choice. This trend has been proved by the development trend of European and American newspaper printing. In the future, China's newspaper printing should adopt flexographic printing technology on the basis of continuing to improve printing quality and reduce costs.
1.Adjusting the structure of newspaper printing At present, in our country's newspaper printing, it is almost the world of offset printing. Regardless of the size and amount of printing, all use offset printing. While Europe and North America broke the single pattern of offset printing in the 1990s, we should also rationally choose the printing method based on specific circumstances. For example, the cost of offset printing for newspapers with tens of thousands of copies will increase significantly. At this time, different printing methods can be selected according to different requirements.
2. High paper loss rate and reject rate is a prominent problem in offset printing. In offset printing, controlling the ink-water balance is an important issue, and achieving ink-jet balance in offset printing requires a process. Under normal circumstances, it takes about 15-30 minutes to adjust and test the printing stage from the time of starting up to enter a stable working state, which will inevitably increase the loss rate. In the offset printing process, there are many factors that affect the ink-water balance, and most of these factors are changed. Even under normal printing conditions, waste products may appear due to changes in certain conditions. For example, the loss rate of sheet-fed four-color offset presses is generally as high as 7%-15%, and the loss rate of web offset printers is even higher than that of sheetfed offset presses. Therefore, from the economic point of view, offset printing is not the best.
3. Offset printing does not have much advantage in the quality of printed products. Offset printing has a high quality and is based on many conditions. If the surface properties of the printing materials are high, fine prints can only be printed when higher-quality, higher-quality coated paper is used. Printing on newsprint is prone to the following problems: (1) offset printing uses fountain solution, and newsprint paper is highly water-absorptive, and the whiteness of the paper will decrease after absorbing water; (2) the surface roughness of the newsprint will affect the clarity of the text. (3) In the printing process, it is easily affected by external factors, and the printing quality is poor in stability. It is prone to defects such as uneven ink and dull colors.
4. Offset printing is at a disadvantage in terms of environmental protection Offset printing ink is a low viscosity solvent ink. The solvent content of the ink is relatively high. Without the oxidation of the conjunctiva catalyst, it is directly absorbed by evaporation and evaporated by heating. It is difficult to print for hours. When it is fully dried, it not only causes troubles in the printing process, but when the reader gets the newspaper, the dry ink will stick to the hand. In addition, solvent-based inks have a strong odor, which is detrimental to both the operator and the reader. In addition, volatile organic solvents in the ink are contaminated by the environment. Therefore, rotary offset printing ink is a contaminating ink and its use should be gradually restricted.
5. Offset printing has certain requirements for paper. Offset printing has a higher printing speed and uses fountain solution. If the paper is too thin, it may cause breaks. Therefore, the paper used for offset printing should not be too thin, and should not be less than 52 g/m2 in general, which will also increase the cost of printing products.
6. Offset has higher requirements on the technical level of operators. Because the structure of offset press is more complex, the adjustment position is the most among various types of printing presses, and the control of ink balance is difficult to grasp, so the technical level of the operator There are higher requirements in terms of basic knowledge and skills. According to reports, in the offset printing industry, less than one-third of the basic requirements of the lead printer can be seen, it is obvious that it is difficult to cultivate a relatively good offset printing machine.
In summary, in the past 10 years, China's newspaper printing has achieved offset printing, and offset printing has played a significant role in the development and progress of China’s newspaper industry. However, with the rapid development of printing technology, the use of offset printing in newspaper printing is not the best choice. This trend has been proved by the development trend of European and American newspaper printing. In the future, China's newspaper printing should adopt flexographic printing technology on the basis of continuing to improve printing quality and reduce costs.
China Senbo Industry Co.,ltd , https://www.yylpaper.com