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Method for producing support for planographic printing plate, support for planographic printing plate, and planographic printing plate precursor

A lithographic printing plate and carrier technology, which is applied in the field of lithographic printing plate precursors, can solve the problems that the lithographic printing plate cannot be produced from recycled aluminum ingots, and it is difficult to control the edge deformation within a predetermined range.

Inactive Publication Date: 2006-09-06
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when such flat aluminum ingots are rolled into aluminum sheets, it is often difficult to control the edge deformation within a predetermined range by simply adjusting the rolling conditions.
[0018] For these reasons, it has hitherto been considered impossible to make practical lithographic printing plates from recycled aluminum ingots.

Method used

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  • Method for producing support for planographic printing plate, support for planographic printing plate, and planographic printing plate precursor
  • Method for producing support for planographic printing plate, support for planographic printing plate, and planographic printing plate precursor
  • Method for producing support for planographic printing plate, support for planographic printing plate, and planographic printing plate precursor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0125] 1. Aluminum plate:

[0126] The aluminum plates to be processed in this embodiment include ordinary aluminum plates for roll lithographic printing plate supports, and aluminum ingots or plates regenerated from cutting aluminum, recycling aluminum, and the like.

[0127] Rolled aluminum plates include pure aluminum plates such as JIS A-1050, JIS A-1100, and aluminum alloy plates such as JIS A-3003, JIS A-3103, and JIS A-5005.

[0128] As mentioned above, the recycled aluminum ingot used here may contain various elements such as Fe, Si, Cu, Mg, Mn, Zn, Cr and Ti, but the preferred aluminum content is 99.4-95% by weight. Some secondary aluminum ingots can be purchased on the market, such as JIS A-3104.

[0129] The Fe content of the aluminum plate is preferably 0.3 to 1.0% by weight. Even the primary aluminum plate contains about 0.1-0.2% by weight of Fe, and only a very small amount of Fe is dissolved in aluminum to form a solid solution, and most of them form intermetallic c...

Embodiment 1

[0249] "Formation of Lithographic Printing Plate Carrier"

[0250] The molten recycled aluminum ingots having the composition shown in Table 1 were degassed, filtered, and then cast into flat aluminum ingots in a DC casting mode.

[0251] Cut a 10mm deep notch on the surface of the flat aluminum ingot, then heat it, and hot-roll it into a 4mm thick aluminum alloy plate at 400°C without heating.

[0252] Then, the aluminum alloy plate is cold rolled to a thickness of 1.5 mm, then annealed, and then cold rolled to a thickness of 0.24 mm, and leveled to an aluminum sheet.

[0253] Fe

Si

Cu

Ti

Mn

Mg

Zn

Cr

Total weight of other impurities

Al

0.7

0.5

0.5

0.1

1.4

1.4

0.1

0.05

0.01

95.24

[0254] The surface of the aluminum sheet was roughened according to the following method, and then anodized.

[0255] 1. Surface roughening:

[0256] While continuously conveying in the...

Embodiment 2

[0325] The lithographic printing plate support was prepared in the same manner as in Example 1, and passed through boiling pure water, thereby closing the micropores in the oxide film formed on the support.

[0326] Then, the carrier subjected to the micropore sealing treatment was immersed in a sodium silicate solution with a sodium silicate concentration of 2.5% by weight and a solution temperature of 70° C. for 14 seconds to hydrophilize the surface of the carrier.

[0327] The relationship between the sodium silicate concentration of the sodium silicate solution used for the treatment, the solution temperature and the solution conductivity is obtained in advance. During the treatment process, monitor the liquid temperature and conductivity of the sodium silicate solution used to obtain the sodium silicate concentration of the solution; add water and No. 3 bulk sodium silicate to the solution to keep the solution during the entire treatment time Predetermine a constant sodium s...

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Abstract

The invention provides a method for producing a support for planographic printing plates which comprises a step of roughening the surface of an aluminum plate and in which the surface-roughening step includes (1) a pre-electrolytic surface-roughening step of electrolytically roughening the surface of an aluminum plate in an aqueous hydrochloric acid solution, (2) an alkali-etching step of etching the roughened surface of the aluminum plate with an alkali solution, (3) a desmutting step of contacting the etched aluminum plate with an aqueous sulfuric solution having predetermined sulfuric acid and aluminum ion concentrations at a predetermined temperature for 1 to 180 seconds, and (4) an electrolytic surface-roughening step of processing the desmutted aluminum plate in an aqueous nitric acid solution with an alternating current being applied thereto. The invention enables stable and inexpensive production of planographic printing plate supports even from regenerated aluminum.

Description

Technical field [0001] The invention relates to a method for preparing a lithographic printing plate carrier, relates to a lithographic printing plate carrier, and relates to a lithographic printing plate precursor. Background technique [0002] Usually the lithographic printing plate precursor is made by a method that includes roughening the surface of a pure aluminum plate or aluminum alloy plate (hereinafter referred to as "aluminum plate"), and then performing anodization on the surface to form an oxide film to obtain a lithographic printing plate carrier , And the photosensitive or heat-sensitive resin is coated on the surface of the oxide film formed on the lithographic printing plate carrier to form a photosensitive or heat-sensitive plate layer. A photosensitive resin layer and a heat-sensitive resin layer optionally combined with an undercoat layer and a protective layer are known, for example, JP-A 62333 / 2000, 101651 / 1984, and 149491 / 1985. [0003] Images including lett...

Claims

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Application Information

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IPC IPC(8): C25F3/00B41N3/03
CPCB41N3/034C25F3/04
Inventor 西野温夫增田义孝泽田宏和上杉彰男
Owner FUJIFILM CORP
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