英语翻译An effective short-term remedy for many of the printing

英语翻译
An effective short-term remedy for many of the printing defects that the digital ladder target diagnoses is to reduce the ink density in the affected area.Experienced press personnel will instinctively lower the ink feed to even the tonal appearance of the printing.However,this solution is not ideal because the midtone range is saved at the expense of the shadows and saturated colors.A better approach is to identify and cure the source of the excess directional gain so that density aimpoints can be achieved without sacrificing midtones.The digital ladder targets on the Digital Sheetfed Test Form 4.2 have solid ink targets before and after each target to monitor inking level in-line with the printed target.The density aimpoints should be met to prevent misleading evaluation of the printed target.
In studies of process variability,there are many samples taken during the run according to the sampling plan appropriate for the experimental purposes.To analyze process variability with digital ladder targets,the sample sheets are stacked in order and fanned out so that consecutive targets from one side of the sheet can be seen together.When sufficient samples are available,this viewing is facilitated by cutting the samples perpendicular to the digital ladder targets.The cut targets are then fanned out as shown in Figure 2-7b.
If the pattern of digital ladder targets produced by the fanned-out display shows noticeable variation,periodic image transfer problems are occurring.Other periodic disturbances such as gear streaking,cylinder bounce,or inker variation,are more easily seen when multiple samples are evaluated together.
The digital ladder target is a very sensitive device.If a sample is found in conformance for density,if all digital ladder targets are imaged such that none of the individual sections on any target are visibly distinct from the others,and if all digital ladder targets are uniform in density from gripper to trailing edge,there is good assurance that many serious print problems are absent from the printing system.This is a very good indication of overall reproduction quality