Undesirable interference pattern in process printing.


– Improper screen angles;

– Anilox screen count too similar to plate screen count.


– Screen angles of each colour should be 30° apart. The yellow should be 15° between colours, commonly the cyan and black;

– The nominal screen ruling must be placed 7.5° away from the anilox screen angle;

– Select an anilox screen count of a ratio of 5.5 to 1 i.e. 1001pi plate/550lpi anilox.

For example, a 165 line anilox used with a 85 line screen plate can cause moire because 85 x 2 = 170 which is too close to 165 line.

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