| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cleaning a plate surface exhibiting excellent contamination removing property and simultaneously not deteriorating printing durability of a printing plate, with respect to the printing plate made from a positive-working infrared ray sensitive planographic printing plate. SOLUTION: The method for cleaning the plate surface of the planographic printing plate is characterized by using an emulsion type plate surface cleaner containing a soy polysaccharide for cleaning the plate surface of the planographic printing plate obtained by image exposing the positive-working infrared ray sensitive planographic printing plate having an image forming layer containing an infrared ray absorbing dye with an infrared ray and developing it. |
