Once you have determined the image you want to screen print, that image must be designed in a vector-based program like Adobe Illustrator. Each color in the image needs to be separated into its own individual film so it can print separately on to the final piece.
Create Mesh for Each Film
A mesh screen for each of the films in the design is coated with an emulsion and exposed under lights. The light burns away the image area from the emulsion and leaves only that portion exposed on the screen. That is the portion that gets screen printed on the final piece.
The screen is placed on the piece to be printed and secured. The screen is flooded with the ink, and pulled with a squeegee through the exposed portion of the screen. The ink seeps through the screen onto the piece being printed. It is then dried in preparation for the rest of the printing. The process is repeated for each screen / each color in the design. Each screen / each color has to be precisely lined up with the previous image printed in order for the full design to come together and look seamless.