Method and apparatus for manufacturing sensitized printing plate

摘要

A clearance between an upper knife and a lower knife of a slitter is set at 30 to 100 mum, and the slitter cuts a sensitized printing plate. In the sensitized printing plate cut by the slitter, there is a shear droop which is 20 to 30 mum high at the cut part, and a burr which is less than 50 mum high. If the maximum height of a surface roughness of a cut surface of the sensitized printing plate is 1.2 mum to 12 mum on the average, a hydrophilic property of the cut part improves and the stain of a frame can be decreased.