(1) Work cycle program of flat screen flat screen printing machine. Take the flat screen platform type monochrome semi-automatic hand-surface screen printing machine as an example. One of its work cycles is: feeding → positioning → setting down → lowering to the ink plate, raising back to the ink plate → scraping stroke → raising to the ink Plate → lower the ink return plate → lift the plate → ink return stroke → release positioning → receive. In the continuous cycle action, as long as the function can be realized, the time occupied by each action should be as short as possible to shorten the cycle of each work cycle and improve work efficiency. (2) Embossing line. In the printing process, the ink and the screen printing plate are squeezed to the ink plate to form a contact line between the screen printing plate and the substrate, which is called the impression line. This line is at the edge of the squeegee, and countless embossing lines form the printing surface. Realizing the ideal impression line is very difficult, because the printing stroke is a dynamic process.