The cause and elimination of moire in the most pop

Causes and elimination methods of moire in step tone printing

dot moire is caused by uneven density distribution caused by uneven arrangement in dot printing of more than two colors. This uneven distribution lies between the complete weight and the complete juxtaposition of points. Obviously, the density of focus is less than that of juxtaposition. If the density difference is too large and appears alternately in a regular manner, moire will appear

since the silk braiding structure of silk screen printing is also arranged in a regular manner like dots, there is the possibility of Moire between silk and film. In addition, the printing control of silk screen printing is more variable than offset printing, so the moire control of step tone silk printing is more complex. Liu Yusheng, an old printer, is proficient in the color step and silk printing process, and has a lot of research on the color step and four-color addition process. Recently, at the request of many friends, as a special expert of Huicong silk screen printing, teacher Liu Yusheng specially compiled his valuable experience in plate making with the theme of the causes and elimination methods of moire patterns, and delivered it to Huicong silk screen printing for publication in the 2009 Daquan

like silk printing, lithography and printing, dots are used to reproduce the tone of the original. Y. The m, C and K color plates interfere with each other during dot printing, and various interference patterns will appear, and the patterns will change with the size of the dot angle difference. All the patterns will appear within the included angle of 45 and repeat within the range of 90. The normal pattern is uniform and dense, looks comfortable, and has normal step reproduction performance. It adopts 18 carbon fiber composite fan blades developed by Safran company and abnormal patterns of ceramic matrix composite turbine parts developed by General Electric Company to reduce human resources investment. The patterns are stacked and scattered according to specific rules, and the patterns are coarse. The color depth is uneven, and it looks uncomfortable, which destroys the performance of point reproduction color. Therefore, it is a great taboo for printing, How to eliminate moire has become a necessary experience for all silk printing practitioners. Starting from his own experience, teacher Liu Yusheng analyzed the causes of overprint moire and silk moire. Overprint moire is mainly the result of mutual interference when more than two pictures and texts with small spatial cycle difference overlap; Silk moire is produced by the interference of the warp and weft of the cloth

understand the causes of different moire patterns. Through six aspects of how to correctly select the number of lines added to the original to match the number of wire meshes, the correct plate making technology, the selection of angle of addition, and the correct operation of the process, we analyze in detail how to eliminate moire patterns. This article integrates theory with practice, and has a large number of actual data as an explanation, It is believed that readers will be able to intuitively understand moire and quickly master the method of Moire elimination

in order to better help people in the industry improve the silk printing process, Huicong silk printing special printing has opened up a special topic on the printing process in the technical article column of 09 Daquan, aiming to guide people in the industry to pay attention to the prepress process from the prepress process, and do the first step to ensure the indentation depth and quality of prints corresponding to high Rockwell hardness units