Design of overprint mark and slitting line
（1）The inner side of the overprint mark line is 2mm from the edge of the effective pattern; the width of the bar code is 1mm, and the length is 6mm.
（2）Normally slitting line width is 2mm, 2mm x 2mm x 0.2mm plate line can be designed in the middle.
（3）The size of the pattern off the edge, which was determined according to the length of the roller, the width of the printing film, the length of the plate, etc, should be no less than 20mm; the perimeter of the plate, according to the actual need of type setting, should be no less than 380mm, generally between 450~600mm is the best. If plate diameter is too small, the adjustment of the scraper is not good to operate, if it’s too large, it has a certain impact on the ink transfer.
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