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Offset printing plate, offset printing plate material, support for offset printing plate and offset printing method

A lithographic printing plate and support technology, which is applied in the field of lithographic printing plates and lithographic printing plate materials, can solve the problems of low sensitivity, inability to obtain image reproducibility, operability restrictions, etc., and achieve good anti-pollution and stable thermal storage sex good effect

Inactive Publication Date: 2009-06-24
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has various problems as follows: Same as the conventional PS plate, it is necessary to use an alkaline developer for development, and with changes in the state of the developer (temperature, fatigue), the developability changes, and images cannot be obtained Reproducibility, operability in bright room is limited
However, since the ablated matter is scattered from the plate during exposure, it is necessary to provide a mechanism for suctioning and removing the ablated matter in the exposure device, which is insufficient in the wide applicability of the exposure device.
In addition, since ablation requires a large amount of energy, there are disadvantages in that sensitivity is generally low, and productivity is poor when using the same exposure device
[0017] However, even if these supports are used, it is difficult to obtain a lithographic printing plate material that satisfies printing durability, chemical resistance, thermal storage stability, and stain resistance at the time of restarting printing while maintaining good developability.

Method used

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  • Offset printing plate, offset printing plate material, support for offset printing plate and offset printing method
  • Offset printing plate, offset printing plate material, support for offset printing plate and offset printing method
  • Offset printing plate, offset printing plate material, support for offset printing plate and offset printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0227] [Support 1]

[0228] An aluminum plate (material 1050, tempered H16) with a thickness of 0.24mm is immersed in a 1% by mass sodium hydroxide aqueous solution at 50°C, and dissolved so that the amount of dissolution is 2g / m 2 , After washing with water, it was immersed in a 5% by mass nitric acid aqueous solution at 25° C. for 30 seconds to perform a neutralization treatment, and then washed with water.

[0229] Subsequently, through the electrolyte containing hydrochloric acid 11g / L, acetic acid 10g / L, aluminum 8g / L, with sine wave alternating current, the current peak density is 80A / dm 2 Under the conditions, the aluminum plate is subjected to electrolytic surface roughening treatment. At this time, the distance between the electrode and the sample surface was 10 mm. The electrolytic surface roughening treatment is carried out in 8 times, and the electricity (at the anode) of one treatment is 40C / dm 2 , the total treatment power (at the anode) is 320C / dm 2 . In ad...

Embodiment 2

[0280] [Production of Support 4]

[0281] The support 1 was immersed in a 70° C. treatment solution containing 0.5% by mass of the phosphobetaine compound [1] for 30 seconds. Then, after washing with pure water, it was dried at 80° C. for 2 minutes to obtain a support 4 .

[0282] The image forming layer was coated on the support 4 in the same manner as the printing plate material 5 (sample No. 5), to obtain a printing plate material 10 .

[0283] The same evaluation as in Example 1 was carried out. The number of on-press developed sheets was 20 sheets, and the printing durability was 20,000 sheets or more regardless of the presence or absence of heat preservation treatment. Chemical resistance: ◯, good result.

Embodiment 3

[0285] [Production of Support 5]

[0286] An aluminum plate (material 1050, tempered H16) with a thickness of 0.24mm is immersed in a 1% by mass sodium hydroxide aqueous solution at 50°C, and dissolved so that the dissolved amount is 2g / m 2 , After washing with water, immerse in 0.1% by mass hydrochloric acid aqueous solution at 25° C. for 30 seconds, and wash with water after neutralization treatment.

[0287] Subsequently, using an electrolyte solution containing 10g / L hydrochloric acid, 10g / L acetic acid, and 5g / L aluminum, using sine wave alternating current, the current peak density is 50A / dm 2 Under the conditions, the aluminum plate is subjected to electrolytic surface roughening treatment. At this time, the distance between the electrode and the sample surface was 10 mm. The electrolytic surface roughening treatment is carried out in 8 times, and the electricity (at the anode) of one treatment is 40C / dm 2 , the total treatment power (at the anode) is 320C / dm 2 . I...

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Abstract

An objective is to provide a planographic printing plate material exhibiting excellent properties such as printing durability, resistance to chemicals and anti-stain at the beginning of printing via restart of printing, and also a planographic printing plate exhibiting excellent properties such as printing durability, resistance to chemicals and anti-stain at the beginning of printing via restart of printing. Disclosed is a planographic printing plate comprising a support and provided thereon, an image portion and a non-image portion, wherein the non-image portion comprises a water-soluble phosphobetaine compound.

Description

technical field [0001] The present invention relates to a lithographic printing plate and a lithographic printing plate material, in particular to a printing material capable of forming an image by computer-to-plate (CTP) and a lithographic printing plate made of the material. Background technique [0002] With the digitalization of printing data, there is a CTP printing material that is cheap, easy to operate, and has the same printing adaptability as the PS plate. In particular, CTP system printing plate materials (hereinafter referred to as CTP) of various systems recorded by violet laser light and infrared laser light have been disclosed in recent years. [0003] One of these CTPs includes a method called wet CTP, in which the solubility of an image forming layer of a printing plate material in a developer is changed by exposure, and an image is formed by development with a developer. However, this method has various problems as follows: Same as the conventional PS plat...

Claims

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Application Information

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IPC IPC(8): B41N1/14G03F7/004G03F7/00G03F7/11
CPCB41C1/1016B41C1/1008B41N3/038B41C2210/02B41C2210/08B41C2210/22B41C2210/24
Inventor 森孝博
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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