Principle of screen printing
Screen printing belongs to hole printing. It is called four printing methods together with flat printing, convex printing and gravure printing.
It refers to making screen printing plates with pictures and texts by using a screen as a plate base and a photosensitive plate-making method. Screen printing consists of five elements: screen printing plate, squeegee, ink, printing table and printing stock. According to the basic principle that the meshes of the picture and text part of the screen printing plate can pass through the ink and the meshes of the non-picture and text part cannot pass through the ink, printing is carried out. During printing, ink is poured into one end of the screen printing plate, a scraper is used to exert a certain pressure on the ink part on the screen printing plate, and the ink moves towards the other end of the screen printing plate at a constant speed, and the ink is squeezed to the printing material from the meshes of the graphic part by the scraper during the movement.
Screen printing originated in China for more than 2,000 years. Screen printing is a great invention in China. The US magazine Screen Printing commented on China's screen printing technology as follows: "There is evidence that the Chinese used horsehair and templates 2,000 years ago. The costumes of the early Ming Dynasty proved their competitive spirit and processing technology. " The invention of screen printing has promoted the development of the world's material civilization. Today, 2,000 years later, screen printing technology has been continuously developed and perfected, and has now become an indispensable part of human life.
Screen printing has the advantages of large batch, low price, bright color, long shelf life, fast delivery, etc., and is recognized by more and more industries and widely used. Printed circuit boards of household appliances, patterns on textiles, patterns on T-shirts, T-shirts, shoes, characters on panels of refrigerators, televisions, washing machines, and decorations on ceramics, glass, wall and floor tiles; Various commercial advertising platforms such as electrical appliances, packaging, outdoor, fixed, mobile, etc. In the packaging and decoration industry, screen printing is widely used in high-grade packaging boxes, packaging bottles, cigarette packets and wine packets, especially in super-large packaging and product appearance decoration-screen printing is closely connected with our life.
It is expected that screen printing will maintain a relatively high development speed in the future, with technology gradually improving and industry scale further expanding. Authorities predict that the proportion of screen printing in the total output value of printing production will rise to 10% in the future. There is no doubt that China's screen printing industry is pregnant with greater development space and potential market. So far ,China has become the world's largest screen printing market. China's screen printing 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 used advanced technologies such as computer design, plate making, electronic engraving and painting, while China is still in the research and trial stage on these new technologies. "Guang" is to develop new screen printing products, such as outdoor large screen printing advertisements.
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