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Title:
ALUMINUM SUBSTRATE FOR LITHOGRAPHIC PRINTING
Document Type and Number:
Japanese Patent JP3580462
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To establish a good judgement for a good substrate and stably secure the quality and supply by specifying a measurement method for the surface shape of a lithographic printing block aluminum substrate measured by using an atomic force microscope and also specifying the evaporation range for the average surface roughness, the ratio of specified degree of inclination and the like.
SOLUTION: A lithographic printing block aluminum substrate is formed by using an atomic force microscope under the conditions that when the measurement is carried out in the range of resolution in the horizontal direction of 0.1μm and the angle of 100μm and the surface area and the upper projection area, both found by the approximate three-point problem, are set respectively as (a) and (b), the value of a/b (specific surface) becomes 1.15-1.5, and when the measurement is carried out in the range of resolution in the horizontal direction of 1.9μm and the angle of 240μm, the average surface roughness becomes 0.35-1.0μm and the ratio of degree of angle of 30° or more becomes 5-40%. Also the aluminum substrate is so formed as to be provided with the 85° luster degree of 30 or less as specified by the JIS standard. Also the observation is carried out in the magnification of 750 times by a scanning electronic microscope so that the ratio of 0.5-20μm honeycomb pit occupying area is formed into 30-100% in the visual field of 80μm.


Inventors:
Nishino Akihiro
Kiyotaka Fukino
Akio Uesugi
Application Number:
JP1996000176586
Publication Date:
October 20, 2004
Filing Date:
July 05, 1996
Export Citation:
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Assignee:
Fuji Photo Film Co., Ltd.
International Classes:
B41N1/08; B41N3/03; B41N3/04; C22C21/00; C23F1/00; C25F3/04; (IPC1-7): B41N3/03; B41N3/04
Domestic Patent References:
JP8058256A
JP52039404A
JP59182967A
Foreign References:
Attorney, Agent or Firm:
Shohei Oguri
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Yuriko Hamada



 
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