OPTICAL ALIGNMENT OF MULTI-STATION FLEXOGRAPHIC PRINTING SYSTEM USING MOIRÉ INTERFERENCE

摘要

A method of aligning a multi-station flexographic printing system using Moir interference includes printing, using a first flexographic printing station, at least one Moir interference pattern in a unique location on a first side of a substrate for each of at least one subsequent flexographic printing stations of the system. For each of the at least one subsequent flexographic printing stations, at least one inverted Moir interference pattern is printed on either side of the substrate in a location corresponding to that station's unique location on the substrate. An alignment of at least one of the at least one subsequent flexographic printing stations is adjusted when at least one Moir interference pattern interferes with a corresponding at least one inverted Moir interference pattern.