| 摘要 |
PURPOSE:To enhance safety at a development process and improve the processability of waste liquid by developing a photosensitive lithography plate having a photosensitive layer on an aluminum plate treated with a specific sand grinding process, using an aqueous alkaline developer. CONSTITUTION:The carrier of this lithography plate is subjected to a sand grinding process where the surface of an aluminum plate mechanically roughened via ball grinding or the like is chemically treated and, then, electrochemically roughened with nitric acid, sulfuric acid, a mixture thereof, or the like as a grinding process, or subjected to a sand grinding process where the surface of the aluminum plate is electrolytically roughened, using liquid mainly composed of nitric acid. The photosensitive lithography plate having a photosensitive layer composed of a photosensitive composition is developed on this sand grindered carrier, using an aqueous alkaline developer virtually containing no solvent and having a pH value equal to or less than 12. Thus, sufficient printing resistance can be provided and at the same time, the degree of contamination at a printing process can be restrained. Also, a handling danger such as hand decay or the loss of eyesight at a development process can be prevented and the processability of waste liquid can be improved. |
