What is the relationship between screen mesh count and screen dots?

The mesh count and dots of the screen only form a certain relationship when copying continuous-tone originals. When using screen printing technology to copy continuous-tone color originals, if you directly use continuous-tone photographic negatives to make screen printing plates and print, you will not get the same continuous-tone replica as the original. Because the screen printing plate only presents two states, that is, the mesh holes of the image part are open, and the mesh holes of the non-image part are closed. It is not because the mesh size and arrangement rules of a certain specification of screen are unified, so the ink passing through the mesh holes of the screen during printing is basically equal. As a result, the level changes of the original image cannot be expressed. In order to make the depth and level changes of the original pattern fully reflected on the screen printing plate, the continuous-tone original must be made into a dot negative. That is, the depth and level changes of the original are expressed by dots of different sizes and uniform density. The dots with the highest density on the screen printing plate are large in area, the dots with low density are small in area, the dots with the same density are also the same in area, the center distances between dots are equal, and they are arranged regularly at a certain angle. By using this dot film to make a screen printing plate and printing, a continuous tone copy can be obtained. The density of dot arrangement is usually expressed by the number of screen lines. The unit expression is: lines/inch or lines/cm, which means the number of dots arranged in a unit length.