Lithographic printing plate support, method of manufacturing the same, and presensitized plate

Inactive Publication Date: 2007-01-18
FUJIFILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The inventors have also found that, to prevent unevenness due to surface treatment from appearing at the surface of a lithographic printing plate support, it is effective to keep such inhomogeneities from arising in the continuous casting process; and moreover that, even should such inhomogeneities arise, the degree of surface treatment-related unevenness that ultimately appears at the surface can be reduced by improving

Problems solved by technology

However, the inventors have made studies and as a result found that lithographic printing plate supports manufactured from aluminum alloy plates obtainable by these methods have surface unevenness caused by the surface treatment, and that presensitized plates manufactured from such supports have a poor sensitivity.
The inventors have made extensive studies to achieve the above objects and a

Method used

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  • Lithographic printing plate support, method of manufacturing the same, and presensitized plate
  • Lithographic printing plate support, method of manufacturing the same, and presensitized plate
  • Lithographic printing plate support, method of manufacturing the same, and presensitized plate

Examples

Experimental program
Comparison scheme
Effect test

Example

Examples 1 to 25 and Comparative Examples 1 to 4

[0326] Cleaning treatment was carried out on the above aluminum melts, following which, as shown in Table 2, the respective melts were consecutively subjected to a filtration step, a continuous casting step, a cold rolling step, an intermediate annealing step, a finish cold rolling step, a graining treatment step and an anodizing treatment step by the methods described below, thereby obtaining lithographic printing plate supports.

(1) Filtration Step:

[0327] The aluminum melt was filtered using a filtration tank. The filter used in the filtration tank was a ceramic tube filter. A filtration step was not carried out in Examples 6, 7, 16 and 17 of the invention, and in Comparative Examples 1 to 4.

(2) Continuous Casting Step:

[0328] Aluminum alloy plates were continuously cast using the machine shown in FIG. 1. More specifically, first, in a melt feeding step, the aluminum melt was fed from a melting furnace to a melt feed nozzle via ...

Example

Examples 57 and 58, and Comparative Examples 21 to 24

[0489] Cleaning treatment was carried out on the aluminum melts obtained as described above, following which, as shown in Table 8, the respective melts were consecutively subjected to a filtration step, a continuous casting step, a cold rolling step, an intermediate annealing step, a finish cold rolling step, a graining treatment step and an anodizing treatment step by the methods described below, thereby obtaining lithographic printing plate supports.

(1) Filtration Step:

[0490] The aluminum melt was filtered using a filtration tank. The filter used in the filtration tank was a ceramic filter. A filtration step was not carried out in Comparative Examples 22 and 24.

(2) Continuous Casting Step:

[0491] Aluminum alloy plates were continuously cast using the machine shown in FIG. 1. Casting was continued without interruption by feeding additional aluminum melt from a melting furnace (not shown) just before the melt in the holding ...

Example

Examples 61 and 62, and Comparative Examples 27 and 28

[0526] Cleaning treatment was carried out on the aluminum melts obtained as described above, following which, as shown in Table 10, the respective melts were consecutively subjected to a continuous casting step, a cold rolling step, an intermediate annealing step, a finish cold rolling step, a graining treatment step and an anodizing treatment step by the methods described below, thereby obtaining lithographic printing plate supports. A filtration step was not carried out prior to the continuous casting step.

(1) Continuous Casting Step:

[0527] Aluminum alloy plates were continuously cast using the machine shown in FIG. 1. More specifically, first, in a melt feeding step, the aluminum melt was fed from a melting furnace to a melt feed nozzle. Agitation was not carried out at this time. Next, in a casting step, the aluminum melt was fed between a pair of cooling rollers from the melt feel nozzle, then was rolled while being soli...

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Abstract

A lithographic printing plate support in which surface unevenness due to surface treatment has been suppressed and a presensitized plate of excellent sensitivity are produced from an aluminum alloy plate containing iron, silicon, titanium and boron by specifying the state in which TiB2 particles are present in the surface layer and the width of the crystal grains, and by having specific indicators relating to the respective concentrations of iron and silicon in the surface layer following graining treatment fall within specific ranges. In a method of manufacturing the lithographic printing plate support, an aluminum alloy melt having specified alloying ingredients is subjected to a specified casting process to have the amount of the alloying ingredients in solid solution following cold rolling fall within specified ranges.

Description

[0001] The entire contents of documents cited in this specification are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to lithographic printing plate supports obtainable using an aluminum alloy plate, and to presensitized plates for lithographic printing obtainable from such supports. The invention also relates to methods of manufacturing such lithographic printing plate supports and presensitized plates. [0003] Aluminum alloy plates are generally produced by using a semi-continuous casting process (direct chill casting) to cast a slab from an aluminum alloy melt, then subjecting the slab to homogenizing heat treatment, followed by hot rolling, cold rolling and, if necessary, annealing. [0004] To produce aluminum alloy plates continuously by a simpler process than semi-continuous casting, various continuous casting processes have been proposed which use a driven, or moving, mold that casts the plates directly from the aluminum allo...

Claims

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Application Information

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IPC IPC(8): C25D7/06
CPCB22D11/0622B29C43/24B29C43/46G03F7/09B41N3/034B41N6/00C25F3/04B41N1/083
Inventor SAWADA, HIROKAZUUESUGI, AKIO
Owner FUJIFILM CORP
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