working principle and maintenance method of print head ① The principle of inkjet pen and the resolution of inkjet printing. The spray hole of the fountain pen consists of two rows, 150 in each row, a total of 300. The two rows of spray holes are distributed in a cross shape. The maximum spray printing coverage area of each fountain pen is 0.5 inch. By adjusting the resolution of the printing software, the printing frequency can be controlled. 600 * 600dpi refers to printing 600 points within 1 inch, 600 * 300dpi refers to printing 300 points within 1 inch, and 600 * 200dpi refers to printing 200 points within 1 inch. ② Use and maintenance of heads The nozzle must be cleaned and emptied after shutdown within two days. The cleaning and emptying steps are as follows: 1: Adjust the nozzle valve to the cleaning position (vertical to the platform and upward position); 2：Clean the surface of the cleaning solution pipe at the back of the chassis.