Introduction to the working principle of automatic screen printing machine

Screen printing consists of five major elements, namely screen printing plate, squeegee, ink, printing table and substrate. The basic principle of screen printing is: use the basic principle of the screen printing plate's graphic part of the mesh to penetrate ink, and the non-graphic part of the mesh to be impermeable to ink.

When printing, pour ink into one end of the screen printing plate, apply a certain amount of pressure on the ink part of the screen printing plate with the scraper, and at the same time, print towards the other end of the screen printing plate. The ink is squeezed by the scraper from the mesh of the graphic part to the substrate during the movement. Due to the viscosity 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 printing plate and the substrate, and the contact line moves with the movement of the scraper, because the screen printing plate and the substrate Keep a certain gap between them, so that the screen printing plate during printing will generate a reaction force against the scraper through its own tension. This reaction force is called rebound force.

Due to the effect of resilience, the screen printing plate and the substrate are only in a moving line contact, while the other parts of the screen printing plate and the substrate are in a state of separation. The cracking movement between the ink and the screen ensures the printing size accuracy and prevents the substrate from being dirty. When the scraper scrapes across the entire layout, it lifts up, and at the same time the screen printing plate is also lifted up, and the ink is gently scraped back to the original position, so far it is a printing stroke.