Original plate for lithographic printing plate, and method for printing same

A technology of lithographic printing plate and original plate, which is applied in lithographic printing equipment, printing, printing process, etc., can solve the problems of insufficiency, and achieve the effect of excellent recognition

Active Publication Date: 2014-12-10
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] According to these, color development or decolorization occurs in the exposed part, and the plate inspection performance of the image is improved to a certain extent, but it is not enough.

Method used

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  • Original plate for lithographic printing plate, and method for printing same
  • Original plate for lithographic printing plate, and method for printing same
  • Original plate for lithographic printing plate, and method for printing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0356] (1) Treatment of support: condition 1

[0357] In order to remove the rolling oil on the surface of an aluminum plate (material 1050) with a thickness of 0.3mm, after degreasing treatment using a 10% by mass sodium aluminate aqueous solution at 50°C for 30 seconds, use 3 rolls with a gross diameter of 0.3mm Bundle-flocked nylon brushes and pumice-water suspensions with a median particle size of 25 μm (specific gravity of 1.1 g / cm 3 ) The surface of the aluminum is ground (grain), and fully washed with water. After immersing this plate in 45 degreeC 25 mass % sodium hydroxide aqueous solution for 9 seconds for 9 seconds, and washing with water, it was immersed in 20 mass % of nitric acid at 60 degreeC for 20 seconds, and it washed with water. The amount of etching on the frosted surface at this time is about 3g / m 2 .

[0358] Next, an electrochemical roughening treatment was continuously performed using an AC voltage of 60 Hz. The electrolytic solution at this time w...

Embodiment 2

[0383] A lithographic printing plate precursor was produced in the same manner as in Example 1 above except that the image forming layer coating liquid was changed to the image forming layer coating liquid 2 .

[0384]

[0385] To the image forming layer coating solution 1 used in Example 1, an acid developer was further added.

[0386] ・Image forming layer coating liquid 1 12.38g

[0387] ·Acid developer (structure below) 0.1g

[0388]

Embodiment 3

[0390] A lithographic printing plate precursor was produced in the same manner as in Example 1 above except that the image forming layer coating liquid was changed to the image forming layer coating liquid 3 .

[0391]

[0392] To the image forming layer coating solution 1 used in Example 1, a thermal developer was further added.

[0393] ・Image forming layer coating liquid 1 12.38g

[0394] ·Thermal developer (the following structure) 0.1g

[0395]

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Abstract

Provided are: an original plate for a lithographic printing plate, which can provide a visible image having excellent visibility when exposed to light, and which can be developed on a machine; and a method for printing the original plate. An original plate for a lithographic printing plate, which comprises at least a white base plate and an image recording layer, said original plate being characterized in that an image-recording-layer-formed side of the white base plate has a reflection density of 0.25 or less and the image recording layer comprises an infrared ray absorbent, an onium salt-type polymerization initiator, a polymerizable compound and a color-developable compound and can be removed with at least a printing ink and / or a dampening solution. It is preferred that the white base plate comprises an aluminum support and a white layer arranged on the aluminum support and comprising at least a fluorescent whitening agent and / or a white pigment or comprises an aluminum support of which the surface has been roughened so that the degree of sharpness (a45) can become 30% or less and has also been anodically oxidized.

Description

technical field [0001] The present invention relates to an on-press developing type lithographic printing plate precursor and a printing method thereof, and particularly relates to a lithographic printing plate precursor having excellent visibility of visible images after exposure and a printing method thereof. Background technique [0002] Generally, a lithographic printing plate is composed of an oleophilic image portion that receives ink during printing and a hydrophilic non-image portion that receives dampening water. Lithographic printing utilizes the property that water and oily ink repel each other. The lipophilic image part of the lithographic printing plate is used as the ink receiving part, and the hydrophilic non-image part is used as the dampening water receiving part (ink non-receiving part). ) to produce a difference in the adhesion of the ink on the surface of the lithographic printing plate, and only after the ink is applied to the image portion, the ink is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N1/14G03F7/00G03F7/004G03F7/038G03F7/11
CPCB41C2210/26B41C2210/22B41C2201/12B41C1/1008B41C2210/24B41C2210/04B41C2210/08B41C1/1016B41C2201/04B41M1/06B41N1/14G03F7/004G03F7/031G03F7/0388G03F7/091G03F7/105G03F7/11C09D11/106
Inventor 白木文也因埜纪文宫川侑也
Owner FUJIFILM CORP
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