Anilox rolls cause moire, do n’t think you ca n’t do it!
For the flexographic printing plate, if the anilox roller and the flexographic printing plate are not properly selected for the angle and number of screen lines, moire will appear, commonly known as the second type of moire. In order to reduce the second type of moire, the following three measures should be taken according to the actual situation.
1. If the screen angle of the anilox roller is 45 °, not only the screen angle of 45 ° should be avoided for the BK version, but also for other color versions.
2. If the screen angle of the anilox roller is not 45 °, the screen printing angle of 45 ° can be used for the flexographic printing plate. At this time, the width of the anilox roller's anilox wall is controlled at 10 ~ 12μm, which can obviously reduce the moire phenomenon. If the width of the mesh wall exceeds 20 μm after the surface of the mesh is worn, an obvious moire phenomenon will occur.
3. The ratio of the number of lines of the anilox roller to the number of lines of the printing plate should be reasonably controlled. The following table is the reasonable ratio of the number of anilox roller lines and printing plate plus screen lines recommended by the American Flexo Printing Association: That is, as the number of printing plate plus screen lines increases, the ratio of the number of anilox roller lines to the printing plate plus screen lines should be corresponding Increase.
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