Lithographic printing plate precursor

A lithographic printing plate precursor comprising an aluminum substrate, an image-recording layer and a hydrophilic film, the aluminum substrate being subjected to an electrochemical surface-roughening treatment in an aqueous solution comprising hydrochloric acid and provided with the hydrophilic film having at least one of a density of 1,000 to 3,200 kg/m3 and a porosity of 20 to 70%.

A lithographic printing plate precursor comprising an aluminum substrate, an image-recording layer and a hydrophilic film, the aluminum substrate having a surface-roughened shape comprising a small pit wherein an average opening size of the small pit is 0.01 to 3 μm and a ratio of an average depth of the small pit to the average opening size is 0.1 to 0.5, and being provided with the hydrophilic film having a heat conductivity of 0.05 to 0.5 W/mK.

A lithographic printing plate precursor comprising an aluminum substrate, an image-recording layer and a hydrophilic film, the aluminum substrate having a surface-roughened shape comprising a small pit wherein an average opening size of the small pit is 0.01 to 3 μm and a ratio of an average depth of the small pit to the average opening size is 0.1 to 0.5, and being provided with the hydrophilic film having at least one of a density of 1,000 to 3,200 kg/m3 and a porosity of 20 to 70%.

A lithographic printing plate precursor comprising an aluminum substrate, a lipophilic image-recording layer and an overcoat layer, the aluminum substrate being subjected to a surface-roughening treatment and having a hydrophilic film, the lipophilic image-recording layer not comprising a hydrophilic binder resin and comprising a hydrophobic polymer fine particle of undergoing combination by heat, a light-to-heat converting agent and a water-insoluble compound having fluidity at 50° C., and the overcoat layer comprising a water-soluble resin.