DEVELOPING PROCESS METHOD FOR PHOTOSENSITIVE LITHOGRAPHIC PRINTING PLATE BY WHICH STABILITY OF DEVELOPING PROCESS IS IMPROVED

摘要

PURPOSE:To enable always stable developing process of many sheets of PS plates by heating a photosensitive lithographic printing plate in the mid-way of or prior to development. CONSTITUTION:The photosensitive lithographic printing plate is heated in the mid-way of or prior to the development in a method for subjecting the photosensitive lithographic printing plate to image exposing then to the developing process by using an automatic developing machine. A method for bringing the PS plate into contact with a heating medium during conveyance can be used as the means for heating the PS plate. The heating of the PS plate is preferably so executed that the PS plate is maintained at the temp. (preferably in the + or -1 deg.C range of the developing temp.) as near as possible the temp. of the developing soln. to be processed on the surface of the PS plate, i.e., intended developing temp. The temp. of the heated PS plate is preferably normally in 30-80 deg. range. The uniformity of the development result in the case of making the developing process of many sheets of the PS plates by using the automatic developing machine is thereby improved.