Silk screen printing refers to the use of screen as the plate base, and through the method of photosensitive plate making, using the basic principle of screen printing plate graphic part of the mesh can pass through the ink, non graphic part of the mesh can not pass through the ink to make screen printing plate with graphics.
The basic principle of silk screen printing is: using the screen printing plate graphic part of the mesh through ink, non graphic part of the mesh through ink. When printing, the ink is poured into one end of the screen printing plate, and a scraping scraper is used to apply a certain pressure on the ink part of the screen printing plate, while moving towards the other end of the screen printing plate. The ink is squeezed to the substrate by the scraper from the mesh of the graphic part in the movement. Because of the sticky effect of the ink, the imprint is fixed within a certain range. During the printing process, the scraper is always in line contact with the screen plate and the substrate, and the contact line moves with the scraper moving. Because there is a certain gap between the screen plate and the substrate, the screen plate produces a reaction force on the scraper through its own tension, This reaction is called rebound. Due to the effect of resilience, the screen printing plate and the substrate are only in mobile line contact, while the other parts of the screen printing plate are separated from the substrate. So that the ink and screen fracture movement, to ensure the printing dimensional accuracy and avoid rubbing dirty substrate. When the scraper is lifted after scraping the whole layout, the screen plate is also lifted, and the ink is gently scraped back to the original position, which is a printing stroke.
