Method of manufacturing a support for a lithographic printing plate

a technology of lithographic printing plate and support, which is applied in the direction of printing pretreatment and printing, etc., can solve the problems of surface mottling

Inactive Publication Date: 2006-09-28
FUJIFILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025] The method of the present invention provides a support for

Problems solved by technology

However, when supports for lithographic printing plates are manufactured usin

Method used

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  • Method of manufacturing a support for a lithographic printing plate
  • Method of manufacturing a support for a lithographic printing plate
  • Method of manufacturing a support for a lithographic printing plate

Examples

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examples

[0139] Examples are given below by way of illustration and not by way of limitation.

1. Production of Supports for Lithographic Printing Plates

examples 1 to 8

, and Comparative Examples 1 to 10

[0140] Supports for lithographic printing plates were produced by carrying out a feeding step, a casting step, a rolling step and a graining treatment step in the manner described below.

[0141] First, an aluminum alloy plate was continuously cast using the arrangement shown in FIG. 1. To begin with, in the feeding step, aluminum melt that had been subjected to cleaning treatment was supplied from a melting furnace to a melt feed nozzle through a flow channel having a stirrer within a recess as shown in FIG. 3. Next, in the casting step, the aluminum melt was fed by the melt feed nozzle between a pair of cooling rollers, and was formed into an aluminum alloy plate by rolling the melt as it was being solidified with the pair of cooling rollers.

[0142] The circumferential speed V of the cooling rollers and the thickness t of the aluminum alloy plate are given in Table 1. The diameter D of the cooling rollers was 0.9 m.

[0143] Table 1 indicates whether ...

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Abstract

Disclosed is a method of manufacturing a support for a lithographic printing plate, which method includes: a casting step in which an aluminum alloy melt is fed between a pair of cooling rollers by a melt feed nozzle and is rolled as it is being solidified by the pair of cooling rollers, forming an aluminum alloy plate, and a graining treatment step in which a surface of the aluminum alloy plate is subjected to graining treatment which includes at least alkali etching treatment and subsequent electrochemical graining treatment, thereby giving a support for a lithographic printing plate; wherein the surface of the aluminum alloy plate on the side which is subjected to the graining treatment undergoes an amount of aluminum dissolution X per square meter (g/m2) during the alkali etching treatment and has a total amount of electricity Y per square decimeter (C/dm2) applied thereto during an anode reaction in the electrochemical graining treatment such as to satisfy formula (1) below: 1,000>Y≧10X (1). By using this method, a support for a lithographic printing plate which is free of surface mottling is provided.

Description

[0001] The entire contents of literatures cited in this specification are incorporated by reference. BACKGROUND OF THE INVENTION [0002] The present invention relates to a method of manufacturing a support for a lithographic printing plate using an aluminum alloy plate. [0003] Aluminum alloy plate is generally produced by casting a slab from an aluminum alloy melt by a semi-continuous casting process, subjecting the slab to homogenizing heat treatment, then hot rolling, cold rolling and, if necessary, annealing. To produce aluminum alloy plate continuously in a simpler operation, various continuous casting processes have been proposed which use a moving mold to cast an aluminum alloy melt directly as a plate. [0004] Continuous casting processes which use such a moving mold include processes that employ a moving mold in the form of a pair of belts, such as the Hazelett process and processes which employ a moving mold in the form of a pair of rolls, such as the Hunter process and the 3...

Claims

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Application Information

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IPC IPC(8): C22F1/04
CPCB22D11/0622B22D11/0642B22D11/117B41N3/034C22F1/04C25F1/04C25F3/04
Inventor SAWADA, HIROKAZUUESUGI, AKIO
Owner FUJIFILM CORP
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