DEVICE FOR TREATING SURFACE OF PRINTING PLATE SUBSTRATE

PURPOSE:To make a low-cost equipment available and use vapor in a required amount regardless of the thickness of a substrate without flawing the substrate by a method wherein a small liquid tank part through which a printing plate substrate is passed by being supported by a roller is disposed at either or both of an inlet part and an outlet part for the printing plate substrate supplied from or discharged to the external of the device. CONSTITUTION:A substrate 1 which has been provided with an anodized film and thereafter etched is put into a vapor sealing device 3. The etched surface is vapor sealed by vapor sprayed from vapor supply nozzles 2. Next, the substrate 1 is passed through small tank parts 6, 7 by being supported by rollers 8. The small tank parts containing liquid are disposed at an inlet part 4 and an outlet part 5 for the substrate 1 supplied from or discharged to the external of the device. In this manner, the inlet and outlet parts 4, 5 are sealed with the liquid in the small tank parts 6, 7. In this manner, a sufficient hydrophilic treatment can be performed, a quality can be improved and stabilized, and a cost can be lowered.