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AssigneeFuji Photo Film Co., Ltd.
InventorsHisashi Hotta, Yoshinori Hotta, Kazuo Maemoto
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This invention provides a support for a lithographic printing plate, and an original form of a heat-sensitive lithographic printing plate, which comprises a hydrophilic film formed on a metallic base whose surface has been roughened, said hydrophilic film having a heat conductivity of 0.05–0.5 W/(m·K) in the direction of its film thickness, which when used as the development on machine type, exhibits good on-press, or good non-treatment developability, a high sensitivity, a long press life and a preferable stain resistance and ink removal property upon printing and which, when used as a conventional thermal positive or negative type, makes efficient utilization of heat for the formation of image, has a high sensitivity and exhibits a long press life and a good stain resistance in a nonimage area, wherein the non-treatment in which the development is not performed.
A support for a lithographic printing plate, which comprises a hydrophilic film formed on a metallic base whose surface has been roughened, the thickness of said hydrophilic film is 0.1–5 μm and said hydrophilic film having a heat conductivity of 0.05–0.5 W/(m·K) in the direction of its film thickness.
An original forme for a lithographic printing plate, comprising a recording layer which is writable by exposure with infrared laser and which is formed on a metallic base whose surface has been roughened by an electrochemical roughening treatment with an aqueous solution containing hydrochloric acid, and the surface of the metallic base comprises a hydrophilic film having a heat conductivity of 0.05–0.5 W/(m·K), wherein said hydrophilic film is an anodic oxide film.
An original forme for a lithographic printing plate, comprising a recording layer which is writable by exposure with infrared laser and which is formed on a support for a lithographic printing plate, said support being subjected to electrochemical roughening treatment with an aqueous solution containing hydrochloric acid and including a hydrophilic film having a density of 1000–3200 kg/m3 and/or a porosity of 20–70%, wherein said hydrophilic film is an anodic oxide film.
An original forme for a lithographic printing plate, comprising a recording layer which is writable by exposure with infrared laser and which is formed on a support for a lithographic printing plate having a hydrophilic film, said support having a mean opening diameter of roughened small pits of 0.01–3 μm, and a ratio of mean depth to mean opening diameter of the roughened small pits of 0.1–0.5, and said hydrophilic film having a heat conductivity of 0.05–0.5 W/(m·K), wherein said hydrophilic film is an anodic oxide film.
An original forme for a lithographic printing plate, comprising a recording layer which is writable by exposure with infrared laser and which is formed on a support for a lithographic printing plate having a hydrophilic film, said support having a mean opening diameter of roughened small pits of 0.01–3 μm, and a ratio of mean depth to mean opening diameter of the roughened small pits of 0.1–0.5, and said hydrophilic film having a density of 1000–3200 kg/in3 and/or a porosity of 20–70%, wherein said hydrophilic film is an anodic oxide film.
Dependencies are inferred from the claim text.