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Since the silk screen weaving structure of the silk screen is arranged in the same order as the dots, there is the possibility of moire between the screen and the film. In addition, the printing control of screen printing is more variable than offset printing, so the moire control of tone screen printing is more complicated. Teacher Liu Yusheng, an old screen printing worker, is proficient in color gradation and screen printing technology, and has researched on the color gradation four-color screening process. Recently, at the request of the majority of netizens, as a specially appointed expert of the HC Screen Printing Special Screening Network, Mr. Liu Yusheng specially organized his valuable experience in platemaking on the theme of “Cause of Moire and Elimination Methods†and delivered it to HC Screen Printing Special Screen Published in the 2009 Daquan.
Like screen printing and flat printing, as well as printing, dots are used to reproduce the tone of the original. The Y, M, C, and K color plates interfere with each other during dot printing, and various interference patterns and patterns will appear as the angle difference of the dots changes. All patterns will appear within the angle of 45 °, and repeat within the range of 90 °. The normal pattern is even and dense, looks comfortable, and has a normal tone reproduction performance. Unusual patterns, dots accumulate and evacuate according to specific rules, thick patterns, uneven color depth, look uncomfortable, destroy the dots' color reproduction performance, is a taboo in printing, so how to eliminate moire The experience that screen printing practitioners must master. Teacher Liu Yusheng started from his own experience and analyzed the causes of overprinting turtle patterns and silk screen turtle patterns. Overprint turtle patterns are mainly the result of interference between two or more pictures with a small spatial period overlapping. The grain is caused by the interference of the warp and weft of the mesh cloth.
Understand the causes of different moire, through how to properly choose the six screen aspects of the original screen line matching with the screen mesh number, the correct plate making technology, the selection of the screen angle, and the correct operation of the process. In connection with the reality, there are a lot of actual data as an explanation. I believe that it can definitely make the reader understand the moire very intuitively and quickly master the method of eliminating moire.
In order to better help people in the industry to improve the screen printing process, HC Screen Printing Special Screening has opened the special topic of "screen printing platemaking process" in the "Technical Articles" column of 09 "Daquan", which aims to start from the prepress process and guide the industry People pay attention to the pre-press and make the first step to ensure high-quality screen prints.
Causes and elimination methods of tone screen printing moire
The dot moire is caused by the uneven density distribution caused by the uneven arrangement of dot printing on the two colors. This uneven distribution is between the total weight of the dots and the complete juxtaposition. Obviously, the density of heavy dots is smaller than the density of parallel dots. If the density difference is too large and alternately appears regularly, moire appears.