| abstract |
A method for producing a lithographic printing plate, the method comprising: an exposing step for exposing, in the form of an image, an original lithographic printing plate plate which has a layer image recording on an aluminum support body, and forming an exposed portion and an unexposed portion; and a development step of providing a specific developing fluid and removing the unexposed portion. The aluminum support body comprises an aluminum plate and an anodized aluminum film disposed on the aluminum plate. The anodized film has micropores that extend in the direction of the depth from the surface on the opposite side from the aluminum plate. The micropores are each configured from a large diameter hole portion extending from the anodized film surface to a specific position, and a specific small diameter hole portion that communicates with the lower portion of the hole portion of the hole. large diameter. The average diameter of the large diameter hole portions in the anodized film surface is a specific value, and the average value of the small diameter hole portions at the communication position is less than or equal to 13 nm. |