Screen printing principle and process

Screen printing process

Screen printing principle and process

Screen printing has five elements: ink, screen scraper, screen plate, substrate and printing table.The basic principle is: the use of a screen plate with a graphic part can be through the ink, and not with a graphic part of the mesh is not through the ink.The squeegees move on the screen plate and extrude the ink to the substrate through part of the screen. At the same time, the printing ink can be fixed within a certain range due to the viscosity of the ink itself.In the process of printing, the scraper is in linear contact with the screen plate, and the screen plate is in linear contact with the substrate, and the two linear contact is identical, the contact line is not fixed, and it moves with the scraper.Before printing, due to a certain gap between the substrate and the screen printing plate, when printing, the scraper moves, the wire mesh plate due to the pressure of the scraper produces a slight elastic deformation, thus generating a certain tension itself, and there is a reaction force on the scraper, that is, the resilience of the wire mesh plate.Under the action of resilience, the substrate and screen plate only linear contact, and the other parts of the two appear out of the state, so that the ink and screen fracture movement, to ensure the screen printing accuracy and avoid dirty substrate.