Details:
Summary:
With the demand for quality reproduction rising, cost control and automation are of ever-increasing importance. There is a need for tighter control, accuracy, and repeatability of exposures. Such control involves several parameters, including vacuum, intensity, and evenness of illumination, as well as resolution of reproduction. Vacuum frames are the most commonly used means of achieving close contact between original and sensitized material. Light intensity must meet the exposure requirements. Evenness of illumination over the total exposure area is difficult to measure, but may be of importance. Resolution is the ability to reproduce fine detail. It is recommended that careful tests be conducted to establish a realistic requirement, one that is not beyond the limitations of a printing press. Costs should also be considered.