| 摘要 |
Disclosed is a platemaking method to obtain a lithographic printing plate, comprising the steps of: recording an image, by imagewise exposure, on a presensitized plate comprising a lithographic printing plate support and an image recording layer on the support, then developing the presensitized plate on which the image has been recorded so as to obtain a lithographic printing plate; wherein the lithographic printing plate support has an arithmetical mean roughness R a of less than 0.4 µm and has on a surface thereof a grained shape with a structure bearing recessed portions with an average opening diameter of 0.01 to 2.0 µm, and the developing step is carried out using an aqueous solution which contains at least 1 wt% of a nonionic surfactant and/or an anionic surfactant and has a pH of 2 to 10. By this method, a lithographic printing plate which has a long press life and a good scumming resistance, which can be developed with an acidic to weakly alkaline developer, and which enables the amount of wastewater associated with development to be reduced can be obtained.
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