The Study For Plate Life Of Web-Fed Offset Printting

The subject of paper is plate life of web-fed offset printing, which is affected by the quality of PS plate, printing stuffs, printing processes, and printing equipements and so on. It studies the friction and wear of plate surface which has the main influence on plate life. The main contents and the innovative views are as follows:1) It analyzes the printing rolling process with friction and wear theory, and studies the factos which may affect plate life. It finds the optimal ratio of plate cylinder undercut and blanket cylinder undercut which may reduce blanket slippage and prolong plate life.2) The dot wear and the screen ruling may influence printing quality and plate life. The accurate choice of screen may help to prolong plate life.3) By studying plate surface, it mentions that the reinforcement of cylinder anti-bending stiffness can prolong plate life. It analyzes blanket cylinder with finite element method, and optimizes the cylinder stiffness matrix, which improve the anti-bending stiffness of cylinder and make printing pressure more even.