Process for producing aluminum support for material for lithographic printing plate, aluminum support for material for lithographic printing plate, and material for lithographic printing plate

Abstract

The present invention provides a lithographic printing plate material excellent in printing durability, blanket stain prevention, and post-stand stain prevention; an aluminum support for a lithographic printing plate material and an aluminum support for a lithographic printing plate material imparted to the lithographic printing plate material The production method is characterized in that, for the aluminum support body, sequentially implement in the electrolytic solution with hydrochloric acid as the main body at a current density of 35A / dm 2 ~150A / dm 2 , Current capacity 600A×sec / dm 2 ~1500A×sec / dm 2 Perform AC electrolysis rough surface treatment; make the aluminum plate dissolve in 3~5g / m 2 Etching treatment; in the electrolyte with hydrochloric acid as the main body, at a current density of 15-30A / dm 2 , Electricity 100~400A×sec / dm 2 Perform AC electrolysis for rough surface treatment; the amount of undissolved dirt remaining on the dirt in an acidic solution mainly composed of phosphoric acid is 0.05-0.3g / m 2 treatment; anodizing treatment to form a rough surface.

Description

Technical field [0001] The present invention relates to a method for manufacturing an aluminum support used in planographic printing plate materials, an aluminum support for planographic printing plate materials manufactured by the manufacturing method, and a planographic printing plate material using the aluminum support. Background technique [0002] In recent years, for the manufacturing technology of printing plates for offset printing, a computer plate-making system (CTP) that directly records digital data of images on a photosensitive printing plate with a laser light source has been developed, and its practical application is under development. [0003] Among them, in the field of printing requiring high printing durability, it is known to use a printing plate material having an aluminum plate as a support and an image recording layer thereon. [0004] As the aluminum plate, an aluminum plate that has been subjected to roughening treatment and anodizing treatment is genera...

AI Technical Summary

Problems solved by technology

[0009] However, in the lithographic printing plate materials in which the image forming layer is formed on these aluminum supports for lithographic printing plates, the printing durability, especially the printing durability of small dots is insufficient, and in the printing of multiple sheets, there are: Ink is accumulated on the blanket corresponding to the non-image area (blanket contamination), which may cause contamination on the non-image area; or frequent blanket washing operations are performed to prevent contamination.

[0010] In addition, if the printing is stopped halfway during a break, etc., there are problems such as contamination of the non-image area during reprinting (pollution after standing)

[0011] Furthermore, printing using de-VOC printing inks (VOC: Volatile Organic Compounds), which have been used due to recent environmental viewpoints, are not sufficient especially in terms of printing durability, blanket contamination, and post-placement contamination.

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