Fuji Photo Film Company, Limited

Fujifilm Corporation

Hideki Miwa

Akio Uesugi

Atsushi Matsuura

Teruyoshi Yasutake

Hirokazu Sawada

Tsutomu Kakei

Shinya Suzuki

Hisashi Hotta

Atsuo Nishino

Tadabumi Tomita

Tadashi Endo

Katsuyuki Teraoka

Hiroshi Fukuta

In a method of manufacturing an aluminum alloy plate for a lithographic printing plate by continuous casting which includes feeding an aluminum alloy melt through a melt feed nozzle between a pair of cooling rollers and rolling the aluminum alloy melt while solidifying between the pair of cooling rollers, a vessel for feeding the aluminum alloy melt to the melt feed nozzle contains the aluminum alloy melt which is adjusted in such a manner that a vertical amplitude at a level of the aluminum alloy melt existing within the vessel is 10 mm or less. This manufacturing method is capable of obtaining an aluminum alloy plate for a lithographic printing plate with a uniform surface composition and manufacturing a lithographic printing plate support having no surface defect.

Method of manufacturing aluminum alloy plate for lithographic printing plate, aluminum alloy plate for lithographic printing plate obtained thereby and lithographic printing plate support

The present invention provides a method for preparing an aluminum support for lithographic printing plate, the aluminum support for a lithographic printing plate obtained by the method and a presensitized plate using the same, characterized in that anodizing treatment is performed on an aluminum plate after hydrochloric acid electrolytic graining treatment if necessary, nitric acid electrolytic graining treatment are performed on the aluminum plate at a specified ratio of quantities of electricity, and with this method, a lower-purity aluminum plate could be used and a obtained support for a lithographic printing plate is excellent in press life and scum resistance when a lithographic printing plate is prepared.

Aluminum support for lithographic printing plate, method of preparing the same and presensitized plate using the same

A lithographic printing plate support is provided which becomes a support of a PS plate which has excellent ability to withstand repeated printing, and in which defects in appearance, such as dirtying and the like, do not occur. Also provided are a method of manufacturing the lithographic printing plate support and a PS plate which has such merits.

Lithographic printing plate support and method of manufacturing the same

Objects of the present invention are to provide a positive working presensitized plate of a thermal type, which has damage resistance, and which is handled easily in conventional operation, high in sensitivity and excellent in press life when used as a lithographic printing plate, and to provide a support for a lithographic printing plate, which is suitably used for the same. The objects have been achieved by a support for a lithographic printing plate obtained by performing graining treatment, alkali etching treatment and anodizing treatment on an aluminum plate, wherein a ratio of a real area of a surface thereof to an apparent area of the surface set larger by 1.3 to 1.8 times, comprising a pit having an average diameter of 0.3 to 1.0 &mgr;m and a micro grained structure inside on the surface, wherein a ratio of an apparent area of the pits to the apparent area of the surface is 90% or more; and a presensitized plate comprising the support for a lithographic printing plate and a photosensitive layer that can become alkali-soluble by heating provided on the support.

Supporting body for lithography block and original lithography block

Lithographic printing plate support having a roughened surface

The present invention allows the reproduction of a crystalline aluminum hydroxide having a high particle strength and a high purity which can find wide application such as abrasive from a supersaturated sodium aluminate solution which is being recycled in the production of aluminum hydroxide or lithographic printing plate. In a process for the purification of aluminum hydroxide which comprises the hydrolysis reaction of a supersaturated solution of sodium aluminate to crystallize aluminum hydroxide, the improvement which comprises the steps of keeping the temperature of a suspension formed by mixing a mother liquor having a total caustic soda concentration of from 50 to 700 g/l and an aluminum concentration or from 0 to 300 g/l with crystalline aluminum hydroxide at a range of from 10.degree. C. to 200.degree. C. for at least 1 to 48 hours, mixing the suspension with the supersaturated solution of sodium aluminate, and then causing the crystallization reaction at the crystallization reaction temperature.

Process for the purification of aluminum hydroxide and process for the

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Shizouka-ken, Japan

Hideki Miwa