US 10,525,696 B2 · Lithographic printing plate precursor, lithographic printing plate manufacturing method, printing method and aluminum support manufacturing method

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.

Claims20

Dependent claims

A lithographic printing plate precursor having an aluminum support and an image recording layer disposed above the aluminum support,

wherein the aluminum support includes an aluminum plate and an anodized film of aluminum formed on the aluminum plate,
wherein the image recording layer is positioned on the anodized film side of the aluminum support,
wherein 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, and
wherein a surface area ratio ΔS is not less than 35%, the surface area ratio ΔS being determined by Formula (1):
ΔS=(SX−S0)/S0×100(%) (1)
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 by means of an atomic force microscope and a geometrically measured area So.

3 more elements

A lithographic printing plate precursor having an aluminum support and an image recording layer disposed above the aluminum support,

wherein the aluminum support includes an aluminum plate and an anodized film of aluminum formed on the aluminum plate,
wherein the image recording layer is positioned on the anodized film side of the aluminum support, and
wherein 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,
wherein each of the micropores has a large-diameter portion which extends from the surface of the anodized film to a depth of 10 to 1,000 nm and a small-diameter portion which communicates with a bottom of the large-diameter portion and extends to a depth of 20 to 2,000 nm from a communication position between the small-diameter portion and the large-diameter portion,
wherein an average diameter of the large-diameter portion at the surface of the anodized film is 15 to 60 nm, and
wherein an average diameter of the small-diameter portion at the communication position is not more than 13 nm.

3 more elements

Dependencies are inferred from the claim text.

Lithographic printing plate precursor, lithographic printing plate manufacturing method, printing method and aluminum support manufacturing method

Life of this patent

Lithographic printing plate precursor, lithographic printing plate manufacturing method, printing method and aluminum support manufacturing method

Life of this patent

Abstract

Claims20