Fuji Photo Film Company, Limited

Nippon Light Metal Company, Ltd.

Sumitomo Light Metal Industries, Ltd.

Other

Furukawa Aluminum Co., Ltd.

Sky Aluminium Co., Ltd.

Sky Aluminum Co., Ltd.

Sumitomo Light Metal Industries Co., Ltd.

Hirokazu Sakaki

Kazushige Takizawa

Haruo Nakanishi

Hirokazu Sawada

Yoshinori Hotta

Azusa Ohashi

Akira Shirai

Akio Uesugi

Hideki Suzuki

Yasuhisa Nishikawa

Hisao Ohba

Shin Tsuchida

Tsutomu Kakei

Kazutaka Oda

Yoshio Okishi

Mamoru Matsuo

Yoshikatsu Hayashi

Zenichi Tanabe

Kazumitsu Mizushima

Hiroshi Takahashi

Yuji Suzuki

Keisuke Shiba

Satoshi Hoshi

Shigenori Yamauchi

Atsuo Nishino

Masahiro Endo

Kiyotaka Fukino

Akira Nishioka

Masaya Matsuki

Koichiro Aono

Takeshi Kimura

Toru Yamazaki

Hidehito Sasaki

Kotaro Yamasue

Hiroshi Ikeda

Etsuo Kitazumi

Makoto Takeuchi

Chozo Fujikura

Toshiro Yamashina

Tatsuya Tajima

Yuji Abe

Tomohide Yamagishi

Akira Tajiri

Yutaka Okuda

Ryo Shoji

Tadashi Asahi

Shuiti Takamiya

Ichiro Okamoto

In order to produce an aluminum alloy substrate for a lithographic printing plate wherein grain structure refining and homogenizing are promoted, and the uniformity of the appearance of the grained surface is particularly improved, the process of the present invention comprises the steps of: homogenizing an aluminum alloy ingot comprising 0.10 to 0.40 wt % of Fe, 0.03 to 0.30 wt % of Si, 0.004 to 0.050 wt % of Cu, 0.01 to 0.05 wt % of Ti, 0.0001 to 0.02 wt % of B and the balance of Al and unavoidable impurities, at temperatures of 350 to 480&deg; C., successively hot-rolling the ingot with a plurality of passes in such a manner that the aluminum alloy is not recrystallized prior to the hot rolling of the final pass and recrystallized at least in the surface layer of the hot-rolled plate by only the hot rolling thereof to form a recrystallized structure having an average recrystallized grain size of less than 50 &mgr;m in a direction normal to the rolling direction, and cold-rolling the hot-rolled plate. The reduction of the plate in the hot rolling of the final pass is desirably at least 55%.

Process for producing aluminum alloy substrate for lithographic printing plate

The present invention provides a support for a lithographic printing plate prepared by cold rolling a sheet while intermediate annealing is omitted to save energy and the number of the cold rolling steps are decreased to simplify the sheet production steps and to give a desired strength of the sheet, and by inhibiting precipitation of Si particles in the substrate to give extremely excellent resistance to ink staining in the nonimage areas during printing, and a process for producing a substrate therefore. The production process comprises homogenization heat-treating an aluminum alloy slab comprising 0.10 to 0.40 wt % of Fe, 0.03 to 0.15 wt % of Si, 0.004 to 0.03 wt % of Cu, and the balance of Al and unavoidable impurities, hot rolling the heat-treated slab, and cold-rolling the hot-rolled strip without intermediate annealing, the cold rolling including a final pass after which the sheet temperature becomes at least the recovery temperature of the sheet and the following rapid cooling, whereby an aluminum alloy substrate for a lithographic printing plate having a content of precipitated Si of up to 30 ppm and a tensile strength of from 145 to 180 MPa is produced. When the aluminum alloy is electrolytically grained and anodically oxidized, the resultant anodic oxide film can contain up to 200/mm of precipitated Si particles having an average particle size of at least 0.5 &mgr;m.

Aluminum alloy support for lithographic printing plate and process for producing substrate for support

A lithographic printing plate having an average curvature in a rolling direction of 1.5&times;10,mm,or less, a curvature distribution in a crosswise direction of 1.5&times;10,mm,or less, and a curvature in a direction perpendicular to said rolling direction of 1.0&times;10,mm,or less and a method for producing the printing plate are disclosed. A method for producing a support for a lithographic printing plate is also disclosed, which comprises roughening a surface of an aluminum web having a center line average surface roughness of 0.15 to 0.35 &mgr;m and a maximum surface roughness of 1 to 3.5 &mgr;m by at least one of mechanical surface roughening, chemical etching and electrochemical surface roughening, and then applying anodization thereto.

Lithographic printing plate, method for producing lithographic printing plate, and method for producing support for lithographic printing plate

A support for a lithographic printing plate in which uniform pits are efficiently formed by electrochemically graining treatment, always independently of electrolytic conditions to give excellent printing performance, which comprises an aluminum alloy plate containing 0.05% to 0.5% by weight of Fe, 0.03% to 0.15% of Si, 0.006% to 0.03% by weight of Cu and 0.010% to 0.040% by weight of Ti, wherein the Cu concentration of a surface layer portion of from a surface to a depth of 2 &mgr;m of the aluminum alloy plate is at least 20 ppm higher than that of a region deeper than the surface layer portion.

Support for lithographic printing plate

An aluminum substrate for lithographic printing plates which forms uniform pits on electrolytic etching without undergoing dissolution, the substrate being obtained by electrolytic etching an aluminum plate prepared by continuous casting in a twin roll mold process, rolling, and annealing, in which the annealing is carried out in such a manner that the resulting aluminum plate may have a total electric current density of not more than 1.85.times.10.sup.-2 C/dm.sup.2 when scanned at a potential from -100 mV up to 1500 mV.

Aluminum substrate for lithographic printing plate and process for

A support for a lithographic printing plate having a corrugated surface processed by roughening, wherein the corrugation on the support surface comprises big corrugation having an average pitch of from not less than 5 .mu.m to not more than 30 .mu.m, and middle corrugation superimposed on the big corrugation, the middle corrugation comprising honeycomb pits having an average diameter of from not less than 0.5 to not more than 3.0 .mu.m, and the support surface has a surface inclination distribution which comprises an inclination of not less than 30 degrees in a proportion of from not less than 5% to not more than 20% as determined by an atomic force microscope. A process for the preparation of the support and an electrolytic treatment apparatus for the process are also described.

Support for lithographic printing plate, process for the preparation

A light-sensitive sheet comprises an aluminum alloy support and a light-sensitive layer. The aluminum alloy support contains grains of secondary phase. The maximum grain size of the grains of secondary phase essentially is less than 5 .mu.m. Silver halide light-sensitive materials having the aluminum alloy support are also disclosed.

Light-sensitive sheet having aluminum alloy support and silver halide

An aluminum alloy support for a planographic printing plate is disclosed, which is an aluminum alloy plate comprising 0&lt;Fe.ltoreq.0.20 wt %, 0.ltoreq.Si.ltoreq.0.13 wt %, Al.gtoreq.99.7 wt % and the balance of inevitable impurity elements, wherein the number of intermetallic compounds present in the arbitrary thickness direction with in 10 .mu.m from the plate surface is from 100 to 3,000 per mm.sup.2 and the intermetallic compound has an average particle size of from 0.5 to 8 .mu.m, with the intermetallic compounds having a particle size of 10 .mu.m or more being in a proportion by number of 2% or less. Also disclosed is a method for producing the above-described aluminum alloy support.

Aluminum alloy support for planographic printing plate and method for

A continuously cast and rolled aluminum alloy substrate for an electrolytically grainable lithographic printing plate, consisting of 0.20 to 0.80 wt. % of Fe and the balance of Al, grain-refining elements and unavoidable impurities including 0.3 wt. % or less of Si and 0.05 wt. % or less of Cu, the amount of Fe present in solid solution being not more than 250 ppm, the amount of Si present in solid solution being not more than 150 ppm, and the amount of Cu present in solid solution being not more than 120 ppm.

Aluminum alloy substrate for lithographic printing plate and process of

An aluminum alloy substrate for an electrolytically grainable lithographic printing plate, consisting of an aluminum alloy cold-rolled sheet, produced by a continuous casting and rolling process, comprising 0.20 to 0.80 wt % of Fe with the balance consisting of aluminum, grain refining elements, and unavoidable impurities including 0.3 wt % or less of Si and 0.05 wt % or less of Cu, grains in a surface layer portion having a width of not more than 150 .mu.m in a direction parallel to the sheet surface and normal to the direction of cold rolling and a length, in a direction parallel to the direction of cold rolling, of not more than 8 times the width.

Aluminum alloy substrate for electrolytically grainable lithographic

A method for preparing a substrate for lithographic printing plates comprises the steps of forming a hydrated oxide layer on the surface of an aluminum plate and then anodizing the plate in a sulfuric acid electrolyte; a lithographic printing plate comprises the substrate; and the substrate per se prepared by the method is also disclosed herein. The presensitized plate for use in making lithographic printing plates which comprises the substrate has very high sensitivity which makes the presensitized plate applicable to new exposure methods and is capable of being developed with a developer of an aqueous solution system. The light-sensitive layer and the substrate of the presensitized plate are strongly adhered to one another and, therefore, the resulting lithographic printing plate has excellent printing durability and good printability.

Method for preparing substrate for lithographic printing plates,

An aluminum alloy substrate for presensitized plates for use in making lithographic printing plates comprises an aluminum alloy plate composed of not less than 0.05% by weight and less than 0.5% by weight of Si; 0.2 to 0.7% by weight of Fe; 0.3 to 1.5% by weight of Mn; less than 0.5% by weight of Cu; and the balance of aluminum and unavoidable impurities, the surface of the aluminum alloy plate being subjected to electrolytic graining treatment. The aluminum alloy substrates for PS plates are favorable for appropriate electrolytic graining treatment and show good printing properties and sufficient strength suitable for high-speed printing operation.

Substrates for PS plates

An aluminum alloy substrate for a lithographic printing plate consisting essentially of an aluminum alloy plate containing 0.2 to 0.5% by weight of Si, 0.3 to 0.7% by weight of Fe, 0.004 to 0.02% by weight of Cu, 0.9 to 1.5% by weight of Mn, 0.05 to 0.3% by weight of Mg and 0.01 to 0.04% by weight of Ti and the balance of Al and impurities, in which the surface of said aluminum alloy plate is roughened electrolytically and anodized. The alluminum alloy substrate has high mechanical strength and can also rapidly print a large number of copies with less stain.

Aluminum support for lithographic printing plate

An aluminum alloy support material for a lithographic printing plate which consists essentially, on a weight basis, of 0.5-2.0 % Mn, 0.05-1.0 % Si, 0.15-1.0 % Fe, 0-0.10 % Ti, and a balance of Al and inevitable impurities. The support material has a specific resistance satisfying the following inequality: Specific resistance (.mu..OMEGA.mm).ltoreq.14+16[% Ti] as measured in liquid nitrogen at 77 K, and a particular size distribution of precipitates therein. The support is produced from an ingot of an aluminum alloy having the above composition by homogenizing, hot rolling, cold rolling, intermediate annealing, and finish cold rolling under specific conditions followed by electrochemical graining. The support has fine, uniform pits formed by electrochemical graining and improved strength and printability.

Aluminum alloy support material and process for producing a support for

The present invention relates to an aluminum support for a lithographic plate, whose surface is electrochemically roughened and has the following conditions:

Presensitized aluminum lithographic plate having thereon a positive or

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Shizuoka, Japan

Hirokazu Sakaki