Everything must develop with the changes of the times, otherwise it can only be forced to accept the fate of being eliminated. This is also true of screen printing, which has been used for more than 2,000 years, and the new requirements of the new era have given it more new content.
  
Although screen printing technology originated in China, the rapid development in mainland China began in the 1980s. At that time, screen printing only grew at a rate of more than 5% in China until 2011, when the output value exceeded 50 billion yuan, which was close to 10% of the total output value of the printing industry. After more than 30 years of development, screen printing is now not only closely related to people's daily lives, but it is also closely related to all industrial products. It is also a fast train for the development of high-tech industries and has become a touch screen, thin film circuit, solar energy and other electronic An integral part of the industry.
  
   New features
  
In traditional screen printing, a silk fabric, a synthetic fabric, or a metal wire mesh is stretched over a net frame, and a screen printing plate is produced by hand-lacquering or photochemical plate making. Modern screen-printing technology has been improved. It uses photo-sensitive materials to make screen printing plates by photolithography. During printing, the ink is transferred to the substrate through the mesh of the graphic part through the extrusion of the scraper. The same graphics as the original. In order to adapt to the increasingly fierce market competition and meet more and higher requirements of customers, silk screen printing technology has been rapidly improved and improved in recent decades. Compared with other printing methods, the following five characteristics are mainly exhibited.
  
1. Wide range of printing
  
Screen printing has great flexibility and wide applicability. With screen printing, it is possible to print on plain, specially shaped substrates or even irregular surfaces. In addition, the screen printing printing format is relatively broad, it can be a large area of ​​printing, printing format up to 3m × 4m or more, you can also print on ultra-small, ultra-high precision objects. Because the screen printing plate is soft and flexible, and the printing pressure is relatively small, screen printing can be selected when it is required to print on flexible substrates such as textiles and various glass and ceramic vessels that are easily damaged by pressurization.
  
2. Ink range adjustable
  
Prints printed using letterpress and offset printing have a thickness of only a few microns, and gravure printing is 12 to 15 μm. Compared with them, the screen printing ink layer thickness is relatively wide: under normal conditions, the screen printing ink layer thickness is about 10 ~ 20um; the thinnest up to 5um; and for special thick film printing, ink layer will More than 1000um. The thicker screen printing ink layer makes it more suitable for printed circuit boards, oil paintings, and textile printing. In addition, since the hiding power of the ink is particularly strong, pure white printing can be performed on a completely black paper.
  
3. Applicable to various types of ink
  
The wide range of inks that can be used in screen printing has gone beyond the usual definition of ink, including pastes, pastes, paints, adhesives, and solid powders. Therefore, screen printing inks are sometimes referred to as "printing materials." In addition, compared with other printing methods, the screen printing does not require very high precision for the pigment particles in the ink, so long as the ink and the coating that can pass through the mesh fineness can be used.
  
4. Good outdoor performance
  
Since the screen printing is applicable to a wide range of inks, it can use inks incorporating light-fast pigments or fluorescent pigments, so that the graphic images of prints can be kept from being affected by temperature and sunlight, and can even emit light at night. This feature determines that screen-printed products can be used outdoors for advertising and signage.
  
5. Not subject to business restrictions
  
Screen printing, like lithography, letterpress printing, and gravure printing, can be mass-produced industrially. At the same time, it has other three printing methods unmatched plate making convenient, cheap, flexible and diverse printing methods, technology is easy to grasp the characteristics, so you can not be limited by the size of the company, even if individual operations are feasible.
  
   new trend
  
The development of screen printing technology relies on and promotes the continuous innovation and improvement of screen printing equipment. The market demand for screen printing needs to increase the number of color registrations and improve the fineness of printing. It is no doubt that silk screen equipment manufacturers have put forward higher requirements. According to the current development situation of the screen printing market, perhaps automation, high quality, and in-line production will become the main development trend of screen printing equipment in the coming period of time.
  
1. Manual screen printing equipment will gradually decrease. Although the current situation in China is still manual, semi-automatic, fully automatic screen printing machine coexistence, and will not change in the short term, but with the increasingly fierce market competition and the increasing demand for silk screen technology, manual screen printing equipment will gradually decline trend.
  
2. Automatic equipment will be developed with high precision, high quality and large format. Semi-automatic screen printing machine is the focus of attention of many domestic manufacturers. Under the double pressure of increasingly fierce market competition and continuous improvement of process requirements, manufacturing companies may pay more attention to the novelty of design and diversity of functions in product design, especially the integration. The semi-automatic screen printing opportunity of high-tech concept is more popular. For example, the control panel adopts a touch screen, a monitoring and positioning CCD conversion system is installed, and the servo motor drive working platform has automatic alignment and photoelectric sensing alignment functions, etc., which will be some time in the future. Within the market development trend. At the same time, the rapid development of the advertising industry will put forward more and higher requirements for large-format printing, and will also make the semi-automatic wide-format screen printing machine show a good development trend.
  
3. The application of silk screen production lines will show an upward trend. Screen printing production line is gradually welcomed by multi-color printing and drying on a single production line, especially in the cosmetics industry. The fully automatic drum screen printing line will be combined with its high precision and high speed, and will occupy more and more market share in the future screen printing equipment market in China.
  
4. The new screen printing equipment provides sufficient protection for the development of hi-tech industries. The automatic spreader is basically popularized, and the demand for CCD screen printers and parallel light exposure machines is increasing. They are indispensable devices in the electronic industry production lines such as flat panel displays, touch panels, and mobile phone lenses.
  
   New application
  
The scope of application of screen printing is actually quite extensive, and it is dubbed by many people that, besides air and water cannot be printed, it can be printed on various materials and substrates with different surface shapes. Its substrates include paper, plastics, wood products, metal products, glass, ceramics, signs, textiles, leather products, optical discs, magnetic cards and so on. Perhaps the most remarkable thing in recent years is its application in hi-tech electronics industry.
  
When a long history of screen printing technology collides with modern electronic information technology, the so-called “electronic screen printing technology” is produced. It is a special field in the screen printing industry and its products have screen printing technology. And the dual nature of electronic information technology. Because of its dual nature, electronic screen printing technology products will have higher technological content and value-added returns. At present, the application of electronic screen printing technology in the hi-tech industry is no longer limited, such as printed circuit boards (PCBs), touch screens, computer LCD displays, solar cells, mobile phones, business communications, electronic dictionaries, and various electronic instruments. All need screen printing aids.
  
The magic of electronic screen printing technology lies in the application scope and service target of the product. Take only PCB and membrane switch and touch panel as examples, in a large-scale cloud computer system, on a magnetic levitation train, on the nuclear submarine "Changzheng No. 1", launching a launch vehicle underwater in a ballistic missile nuclear submarine, and in the Shenzhou series. In space vehicles, underwater vehicles, and new guided missile destroyers, PCBs, membrane switches, and touch panels designed and manufactured by the Chinese themselves can be seen, which prove to the world that electronic wires are active in high-tech fields. Web printing technology and its products have strong practical ability and beautiful prospects.
  
Screen printing, as a time-honored invention, carried too many ancient civilizations. In the new era, while adhering to its inherent characteristics, it also closely follows the rhythm of the times and expresses new energy that belongs to this era.

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