Filmwork Generation

Quality of the film set used for PCB manufacture and care in handling are of vital importance. Reference is made to the need for proper nomenclature and the stability, size and registration requirements. Production PCB films can be generated by reduction from oversize master artworks, or directly at one to one scale on a photo‐plotter. Plotted films; cut and strip master films; manual artwork; two colour artwork; single pad, multiple track sheet artworks; and hybrid artworks are discussed. Special attention is given to planes and solder resist films, photo‐reduction, phototools and film processing.