Lithographic printing plate precursor, lithographic printing plate manufacturing method, printing method and aluminum support manufacturing method
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United States of America
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Jan 7, 2020
Grant Date -
May 16, 2019
app pub date -
Jan 11, 2019
filing date -
Jan 11, 2019
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Abstract
A lithographic printing plate precursor, a lithographic printing plate manufacturing method, a printing method and an aluminum support manufacturing method enable the resulting lithographic printing plate to have a long tiny dot press life. The lithographic printing plate precursor includes an aluminum support and an image recording layer. When measured over a 400 μm×400 μm region of a surface of the aluminum support on the image recording layer side using a three-dimensional non-contact roughness tester, pits with a depth from centerline of at least 0.70 μm are present at a density of at least 3,000 pits/mm2. A surface area ratio ΔS is not less than 35%, where ΔS is determined using an actual area Sx obtained, through three-point approximation, from three-dimensional data acquired by measurement at 512×512 points in 25 μm square of the surface of the aluminum support on the image recording layer side.
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