Flexography is widely used for the printing of self-adhesive materials,and the changes in printing dots effect the quality of image reproduction on self-adhesive materials,so dot gain compensation is required.In this study,a testing plate was designed and dot gain data under different printing conditions was obtained.With the least-squares method,the dot gain curve was fitted using Matlab software.The effect of plate hardness,printing pressure,and the number of screening lines on dot gain was compared and analyzed.At the same time,the dot gain was compensated by using the"actual dot expansion compensation"algorithm,and the compensation was verified through simulation.The research results indicated that the flexible plates with high hardness and a moderate number of screening lines should be selected for flexography of mirror-coated paper self-adhesive material and printed under the condition of printing pressure as small as possible.In addition,with the"actual dot expansion compensation"algorithm,the dot gain compensation can be effectively controlled to restore printing tone.
Dot gainFlexographyLeast square methodSelf-adhesive material
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NSTL
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