Fujifilm Corporation

Fuji Photo Film Company, Limited

Tsuyoshi Hirokawa

Atsushi Matsuura

Ryo Nakamura

Toru Yamazaki

Hisashi Hotta

The present invention provides a lithographic printing plate precursor that enables a lithographic printing plate formed therefrom to have excellent image visibility and a long press life, as well as a lithographic printing plate manufacturing method and a printing method. The lithographic printing plate precursor of the invention is a lithographic printing plate precursor including an aluminum support and an image recording layer, the aluminum support includes an aluminum plate and an anodized film of aluminum formed on the aluminum plate, the anodized film is positioned closer to the image recording layer than the aluminum plate is, the anodized film has micropores extending in a depth direction of the anodized film from a surface of the anodized film on the image recording layer, the micropores have an average diameter of more than 10 nm but not more than 100 nm at the surface of the anodized film, and the surface of the anodized film on the image recording layer side has a lightness L* of 70 to 100 in a L*a*b* color system.

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

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 &#x3bc;m&#xd7;400 &#x3bc;m 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 &#x3bc;m are present at a density of at least 3,000 pits/mm. A surface area ratio &#x394;S is not less than 35%, where &#x394;S is determined using an actual area Sobtained, through three-point approximation, from three-dimensional data acquired by measurement at 512&#xd7;512 points in 25 &#x3bc;m square of the surface of the aluminum support on the image recording layer side.

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

An electrolytic treatment method and electrolytic treatment device are provided for electrolytic treatment of an aluminum web W by applying an alternating current to an upstream electrode and a downstream electrode disposed along a conveying direction a. At least one of a conveying velocity v of the aluminum web W, a frequency f of alternating current applied at the upstream electrode and the downstream electrode, and/or a web conveying direction separation distance dbetween the upstream electrode and the downstream electrode are set such that the alternating current and voltage waveform applied to the aluminum web W at the far end of the upstream electrode and the alternating current and voltage waveform applied to the aluminum web W at the near end of the downstream electrode do not reinforce each other.

Electrolytic treatment method and electrolytic treatment device

This invention provides an apparatus and a method capable of electrolyzing a metal web at a high treating speed and high current density without a problem of uneven treatment, which a metal web is wound, arc-shaped electrodes allocated on the outside of the drum roller concentrically with a space, and an electrolytic solution put in the space, wherein the drum roller is made movable in the vertical direction, and a method using the apparatus.

Apparatus and method for electrolytic treatment

This invention provides an apparatus for electrolytic treatment capable of removing the ununiformity according to the frequency and can achieve high treating speed and high current density treatment, which comprises etching a metal web electrolytically using alternating waveform current continuously, wherein a frequency-variable means having an ability to vary frequency of an electric power supply of said alternating waveform current arbitrarily is provided, and a method therefor.

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Shizuoka, Japan

Tsuyoshi Hirokawa