Presensitized plate and plate-making method using same

A technology of lithographic printing plate and original plate, applied in lithographic printing equipment, photographic plate-making process of pattern surface, printing, etc., can solve problems such as pollution of fountain solution or printing ink, pollution of exposure machine, scattering of image forming layer, etc., and achieve Suppression of ablation, excellent visibility, and contamination suppression effects

Active Publication Date: 2019-04-16
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, if the exposure energy is increased, the surface of the image forming layer will be detached and scattered (ablated), and the inside of the exposure machine will be contaminated.
That is, in the on-press developing type lithographic printing plate precursor using the thermal image forming element described in Patent Document 2, there is a problem that the visibility can be improved, but the fountain solution or printing ink is contaminated, and there are problems in the non-printed matter. The image part is stained or the inside of the exposure machine is polluted, etc.

Method used

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  • Presensitized plate and plate-making method using same
  • Presensitized plate and plate-making method using same
  • Presensitized plate and plate-making method using same

Examples

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Embodiment 1～ Embodiment 10 and comparative example 1～ comparative example 7

[0399] 〔Making of the original lithographic printing plate〕

[0400] (production of support body)

[0401] In order to remove rolling oil on the surface of an aluminum plate (material JIS A 1050) with a thickness of 0.3mm, after degreasing treatment with a 10% by mass sodium aluminate aqueous solution at 50°C for 30 seconds, bundle with three bundles with a diameter of 0.3mm Nylon brush and pumice-water suspension with a median particle size of 25 μm (specific gravity 1.1 g / cm 3 ) to grain the aluminum surface and clean it with water. After immersing this aluminum plate in 25 mass % sodium hydroxide aqueous solution at 45 degreeC for 9 seconds for 9 seconds, and washing with water, it was further immersed in 20 mass % of nitric acid aqueous solution for 20 seconds at 60 degreeC, and it washed with water. The amount of etching on the grained surface at this time is about 3g / m 2 .

[0402] Next, electrochemical roughening treatment was continuously performed using an AC volt...

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Abstract

Provided is a thermal fusion-type presensitized plate comprising a support and an image recording layer, wherein: the image recording layer can form an image by infrared laser exposure; an unexposed section of the image recording layer can be removed on a printer by at least either of dampening water and a printing ink; and the image recording layer contains (1) a color development system in whichthe hue variation generated by the infrared laser exposure is [Delta]a / [Delta]b >= 0.6, and (2) a thermoplastic polymer particle at 70 mass % or more of the solid content of the image recording layer. The presensitized plate has excellent visibility, ablation in laser exposure is suppressed, and contamination of the dampening water and the printing ink in on-press development is suppressed. Alsoprovided is a plate-making method using said presensitized plate.

Description

technical field [0001] The present invention relates to a lithographic printing plate precursor and a plate making method using the same. In particular, it relates to a lithographic printing plate precursor capable of image recording and on-press development by various lasers based on digital signals, and a plate making method using the same. Background technique [0002] A lithographic printing plate consists of an oleophilic image portion that receives ink during printing and a hydrophilic non-image portion that receives fountain solution. Lithographic printing is a method in which the lipophilic image portion of a lithographic printing plate is used as an ink receiving portion and the hydrophilic non-image portion is used as a fountain solution receiving portion (ink non-receiving portion) by utilizing the property that water and oily ink repel each other. , A difference in the adhesion of the ink occurs on the surface of the lithographic printing plate, and after the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41N1/14B41C1/10G03F7/00G03F7/004
CPCG03F7/00G03F7/004B41C1/1008C09B23/0066B41C1/1025B41C2210/04B41C2210/08B41C2210/22B41C1/1033C09B23/107G03F7/0045G03F7/2006G03F7/32
Inventor 落水朋树会津康平
Owner FUJIFILM CORP
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