PRINTING SCREENS , MACHINE AND METHOD FOR SCREEN PRINTING

摘要

A printing screen (5) for use in printing a pattern of deposits onto a workpiece, the printing screen (5) comprising a sheet including a code element (9) therein, wherein the code element (9) comprises a plurality of code apertures (11) which extend through the sheet and together define a code, which can be read by a code reader from either surface of the sheet.