Basic technological principle of screen printing: printing is based on the basic principle that the mesh of graphic part of screen printing plate is permeable to ink, while the mesh of non-graphic part is impermeable to ink. When printing, the ink is poured into one end of the screen printing plate, and the ink part of the screen printing plate is pressed with a scraper, while moving to the other end of the screen printing plate. During the movement, the scraper squeezes the ink from the grid of the graphic part onto the substrate. Because of the viscosity of ink, the imprint is fixed in a certain range. In the printing process, the scraper always contacts the screen printing plate and the substrate line, and the contact line moves with the movement of the scraper. Because there is a certain gap between the screen printing plate and the substrate, the screen printing plate generates a reaction force on the scraper through its own tension, which is called resilience. Due to the resilience, the screen printing plate is only in movable line contact with the substrate, while other parts of the screen printing plate are not in contact with the substrate. Make the ink and screen break, ensure the printing size accuracy and avoid rubbing the substrate. When the scraper is lifted after scraping the whole page, the screen printing plate is also lifted, and the ink is gently scraped back to the original position. This is a printed stroke.

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