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 Although there are many deficiencies in the screen printing process (such as screen printing resistance and limited tone expression), it is also active in all walks of life because it has some advantages that other printing methods do not have. As the field of application continues to expand, screen printing has become more and more important for people. It is known as a universal printing method capable of printing anything except air and water.
æ¼ The printing method of screen printing determines the ink layer thickness, bright color, and strong hiding power. The ink thickness of screen printing can reach (30 ~ 100) μm (the thickest of all printing methods), and embossed decorative effect is strong. Due to the use of elastic flexible screens, screen printing can be applied to the surface of substrates of various materials and shapes.
 Screen printing can use coarser, different solvent inks and coatings to adapt to the printing of different types of substrates, such as screen printing decorative materials used only for paper packaging: glazing coatings, UV imitation gold etched inks , foaming inks, fragrance inks, pearlescent inks, liquid crystal inks, phosphorescent and fluorescent inks, crystalline glossy inks, and UV “ice flower†inks.
 Screen printing and electrolysis processes, bronzing processes, calcining processes, and plastic molding processes can produce different types of artwork. Screen printing is widely used in the printing of large-scale advertisements and posters, printing and dyeing of textiles, printing of decorative patterns on ceramics and glassware, and printing of various plastic products, signs, printed circuit boards and various handicrafts.
The packaging industry is the main service target of the screen printing industry. More and more goods are packaged and screen printed. Some people even believe that silk screen printing will compete with flexo printing and gravure printing in the field of printing and decorating.
According to reports, the sales volume of US silk screen printers increased at a rate of 12% per year in the 1970s. Some authoritative sources predict that the proportion of screen printing in the world in print production will increase from 5% in the 1980s to 10%. In China, at present, the output value of screen printing accounts for less than 2% of the total printing output value. There is still great potential to be tapped and the development prospect is broad.
Third, the development trend of packaging and printing technology  î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ î€ ã€‚.
 Most foreign multi-color offset presses use the ink remote control, automatic version, automatic register device, and control and fault diagnosis of the entire production process. The domestic start is relatively late, and more efforts are needed in the research and development of a new generation of integrated multicolor offset presses. In addition, the quality of domestic printing equipment (paper, ink, photosensitive materials, blankets) also needs to be improved.
After the signing of the 1995 Montero Convention, the control of the emission of CFC chlorofluorocarbons has become increasingly strict, and solvents such as trichloroethane and tetrafluoroethylene have also been restricted. There are two development paths for flexo printing to meet environmental requirements. One is the development of new environmentally friendly solvent for washing plates, and the other is the development, manufacture and practical application of water developing flexographic plates. At the same time, the thinning of the plate will also be the development direction of flexographic printing.
In recent years, the packaging industry in China has once set off the climax of the introduction of flexo equipment. However, the lack of understanding and experience and the incompatibility of domestic flexo printing equipment have restricted the development of flexographic printing in China. At present, we should devote ourselves to improving the quality of domestically-made flexographic printing plates, anilox rollers, and inks, and actively develop on-line production lines with post-printing decoration processes to improve the quality of flexographic printing to meet the needs of the packaging industry.
3î€ Development Trends in Gravure Printing Technology Gravure printing equipment has a large investment and high platemaking cost, and is only suitable for long-term products. Since gravure ink contains toxic substances, the application is limited. If these deficiencies can be solved, gravure will develop. In recent years, the development of gravure plate making technology has greatly shortened the preparation time for gravure printing, and has increased the competitiveness of gravure printing in the medium and short lived market. It is expected that the development of gravure printing in the future will mainly focus on: electroplating of automatic gravure cylinders; application of non-film electronic engraving process; development of photopolymer thin roll gravure process and wraparound gravure wrapped on rollers; digital Fast proofing; gravure printing presses will develop in the direction of multi-purpose, multi-color, high-speed, automation, linkage, and environmental protection; realize water-based gravure ink printing, and effectively control the solvent residual amount of solvent ink.
The development trend of screen printing technology is undoubted. If we can develop a rotary screen printing machine using water-based ink, if the screen printing machine is more efficient, parameters such as the pressure, speed and angle of the blade can be read. And can achieve program control, if you can repeat the production process in the printing of duplicate prints, if the entire process from prepress preparation to printing can use the correct production data, screen printing will certainly be greater development.
 Screen printing in China will develop in depth and breadth in the future. “Deep†means to develop to a higher level. The international screen printing industry has already widely applied advanced technologies such as computer design, plate making, and electronic engraving. However, China’s new technologies are still in the stage of research and trials; “Broad†means the development of new technologies. Screen printing products, such as large outdoor silk screen advertising.
Undoubtedly, in the new century, China's packaging and printing will have a leap in terms of equipment, technology, and scale.
4î€ Screen printing will be more active. As a representative of stencil printing, screen printing has always been based on workshop production methods in China, and it is considered that it can only produce lines and large color products, which is not acceptable. Church. Today, with the revolution in technology, modern screen printing equipment, materials and processes have injected new vitality into the screen printing process.
January 26, 2019