Screen Printing

Amongst other applications, screen printing is a process to apply solder paste to printed circuit boards. By moving a squeegee across a fine-meshed screen, the paste is deposited on the board. To structure the screen, the full area is coated with a photosensitive lacquer. Then the structures are exposed, after which the opening required are wash out. To achieve a flat end even surface, the screen is mounted in a frame. Today, the printing of solder paste is done almost exclusively with stencil printers.