Screen E-Book (.PDF) - MacDermid Autotype

MoiréDescriptionAn unexpected pattern in the print which was not in the artwork. It is always associatedwith regularly repeating patterns in the print, either dots in 4-colur process or lines. In 4colour process it is generally not present over the whole print area but related to areas ofparticular density.CauseMoiré is caused by the interference of regularly repeating patterns. They can be dot to dot,dot to mesh or line to line or line to mesh.This is an example of classic 15° moiréTechnical referenceSee ‘Moiré causes and cures’ chapter.SolutionUse the MMC to find a mesh/LPI combination which will not cause moiré.Change the screen angles.Use the problematic angle for yellow to make the moiré less noticable.Change the mesh count slightly for the screen causing the moiré.SkippingDescriptionDotty pattern in the 4-colour UV ink print, usually in mid tones.124