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Original edition of lithographic printing plate

A technology of lithographic printing plate and original plate, applied in printing, printing process, preparation of printing surface, etc., can solve problems such as difficult adjustment of sensitivity, pollution resistance and printing resistance

Active Publication Date: 2004-07-14
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, it is difficult to adjust the sensitivity and the balance between stain resistance and printing fastness of the lithographic printing plate precursor having the image recording layer mainly composed of such novolak resins.

Method used

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  • Original edition of lithographic printing plate
  • Original edition of lithographic printing plate
  • Original edition of lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0079] In the preparation of the support for lithographic printing plates of the present invention, it is preferable to subject the above-mentioned aluminum plate to surface treatment including electrochemical roughening treatment in an aqueous solution containing hydrochloric acid to obtain a support for lithographic printing plates. Various treatments can also be included in the treatment. In addition, in the various processes adopted in the present invention, since the alloy components of the aluminum plate used can be eluted into the treatment liquid used in the process, the treatment liquid can contain the alloy of the aluminum plate. Components, especially these alloy components are added before treatment, so that the treatment liquid is in a steady state before use.

[0080] In the present invention, although various treatment steps described later can be combined for roughening treatment, before various electrochemical roughening treatments, it is better to carry out al...

Embodiment 1-7 and comparative example 1-7

[0562] A heat-sensitive positive-type image recording layer was provided on each of the lithographic printing plate supports prepared above as follows, and the lithographic printing plate precursors of Examples 1-7 and Comparative Examples 1-7 shown in Table 1 were prepared. Before the image-recording layer is provided, an undercoat layer described later is provided.

[0563] An undercoat liquid having the following composition was coated on a lithographic printing plate support, and dried at 80° C. for 15 seconds to prepare an undercoat film. The coating amount of the coating film after drying is 15mg / m 2 .

[0564] (undercoat liquid composition)

[0565] The following polymer compounds 0.3g

[0566] Methanol 100g

[0567] water 1g

[0568] Chemical 14

[0569]

[0570]Next, a heat-sensitive layer coating liquid of the following composition was prepared, coated on a support for a lithographic printing plate provided with an undercoat layer, and the coating amount aft...

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Abstract

To provide an original plate for a planographic printing plate, which is excellent in any of sensitivity, and printing resistance, scumming resistance and easy viewability of a water rise in the use of the original plate as the planographic printing plate. In this original plate for the planographic printing plate, an image recording layer, where an image can be formed by heat, is provided on a substrate for the planographic printing plate, which is obtained by applying electrochemical surface roughing using an aqueous solution containing at least hydrochloric acid, anodic oxidation and alkaline-metal silicate treatment to an aluminum plate. The substrate for the planographic printing plate has a grained surface with a structure wherein a large pit with an average opening diameter of 2-10 [mu]m and a small pit with an average opening diameter of 0.05-0.8 [mu]m are superposed on each other, and the average ratio of the depth of the small pit to the opening diameter thereof is in a range of 0.2-0.6. In terms of the substrate for the planographic printing plate, a surface area difference [Delta]S50, which is obtained by means of an atomic force microscope, is in a range of 20-40%, and the coating weight of Si atoms on the surface of the substrate for the planographic printing plate is in a range of 1.0-12.0 mg / m2. (C)2004,JPO&NCIPI.

Description

technical field [0001] The present invention relates to lithographic printing plate precursors. Background technique [0002] The lithographic printing method is a printing method that utilizes the principle that water and oil are substantially immiscible, in which a hydrophilic and ink-repellent area can be formed on the printing plate of the lithographic printing plate used (hereinafter referred to as the non-miscible area). Image part) and the area of ​​water-repellent and hydrophilic ink (hereinafter referred to as the image part.). [0003] The aluminum-based support used in the lithographic printing plate (hereinafter referred to as the support for the lithographic printing plate only.), since its surface is used as a non-image part, it is required to have excellent hydrophilicity and water retention. It is required to have good adhesion to the image recording layer provided thereon, that is, the support must have the above-mentioned various opposite properties. [0...

Claims

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Application Information

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IPC IPC(8): G03F7/004B41N1/08B41N3/03G03F7/00G03F7/09G03F7/32
Inventor 堀田久
Owner FUJIFILM CORP
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