METHOD FOR INDIRECT OR DIRECT COLOR IRIS-EFFECT PRINTING WITH WHOLE CIRCULAR COVERAGE Russian patent published in 1999 - IPC

FIELD: polygraphy, in particular, printing of securities such as banknotes and other color products. SUBSTANCE: method involves rolling assembled plate cylinder printing form with ink by means of gage rolls connected with plate cylinder through toothed gear; imparting forced cyclic reciprocating motion to gage rolls in axial direction and circumferentially relative to plate cylinder without disintegrating toother gear from plate cylinder, with gage roll reciprocating motion speed being within the range of 0.2-4.0 mm and ratio of reciprocating motion number and gage roll revolution number being irrational value of 2-10. Auxiliary accumulating gage roll may be used for receiving and transmitting of color pattern, when this gage is in contact with rubber webs of blanket cylinder. Boundary zone of color gage may be increased by using continuous or stepped screen scale with decreasing filling area. EFFECT: wider range of products which may be manufactured by method, increased picturesque effect by additional colors and tints and improved protective qualities of pattern. 5 cl, 1 dwg