Abstract: Overlay accuracy of its meaning is defined as when printing color printing plates for the graphic on the different colors overlap precisely with a printed product at the top, so that products of various colors cable network is not deformed, fax no deviation and brilliant color, rich three-dimensional. If the overlay are not allowed, then the network can not accurately fit all colors, text, images can not be accurately shown by the distortion of color reproduction. Different printing methods, the impact of register accuracy slightly different reasons, but in general can be divided into three areas, namely, printed material aspects, the printing process aspects as well as printing equipment factors. Printing a lot of common with offset, flexo, etc., different printing methods on the control of different sets of criteria, the reasons are not allowed to overlay different solutions are not the same.
Key word: misregister ; offset printing ; printing accuracy