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AssigneeFuji Photo Film Co., Ltd.
InventorsYoshinori Hotta, Hisashi Hotta, Tadashi Endo
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Disclosed is a support for a lithographic printing plate obtainable by performing at least graining treatment on an aluminum plate, having on its surface thereof, a grain shape with a structure in which a grained structure with medium undulation of 0.5 to 5 μm average aperture diameter and a grained structure with small undulation of 0.01 to 0.2 μm average aperture diameter are superimposed, and a presensitized plate provided with an image recording layer on the support for a lithographic printing plate. By using this presensitized plate, a balance between scum resistance and press life when a lithographic printing plate is produced therefrom, which has been in a trade-off relation in the past, can be maintained at a high level.
A support for a lithographic printing plate obtainable by performing at least electrochemical graining treatment by an electrolyte containing a hydrochloric acid and subsequent alkali etching treatment in which an amount of etching is 0.5 g/m2 or less on an aluminum plate, having on its surface thereof, a grain shape with a structure in which a grained structure with medium undulation of 0.5 to 5 μm average aperture diameter and a grained structure with small undulation of 0.01 to 0.18 μm average aperture diameter are superimposed.
A support for a lithographic printing plate obtainable by performing at least electrochemical graining treatment by an electrolyte containing a hydrochloric acid and subsequent alkali etching treatment in which an amount of etching is 0.5 g/m2 or less on an aluminum plate, having on its surface thereof, a grain shape with a structure in which a grained structure with large undulation of 5 to 100 μm average wavelength, a grained structure with medium undulation of 0.5 to 5 μm average aperture diameter, and a grained structure with small undulation of 0.01 to 0.18 μm average aperture diameter are superimposed.
Dependencies are inferred from the claim text.