Aluminum alloy support material and process for producing a supp

Details Aluminum alloy support material and process for producing a supp Aluminum alloy support material and process for producing a supp

1990-05-09

1991-12-31

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041294, 20412946, 20412975, 430278, C25F 304

Patent

active

050768999

ABSTRACT:
An aluminum alloy support material for a lithographic printing plate which consists essentially, on a weight basis, of 0.5-2.0 % Mn, 0.05-1.0 % Si, 0.15-1.0 % Fe, 0-0.10 % Ti, and a balance of Al and inevitable impurities. The support material has a specific resistance satisfying the following inequality:
Specific resistance (.mu..OMEGA.mm).ltoreq.14+16[% Ti] as measured in liquid nitrogen at 77 K, and a particular size distribution of precipitates therein. The support is produced from an ingot of an aluminum alloy having the above composition by homogenizing, hot rolling, cold rolling, intermediate annealing, and finish cold rolling under specific conditions followed by electrochemical graining. The support has fine, uniform pits formed by electrochemical graining and improved strength and printability.

REFERENCES:
patent: 4189320 (1980-02-01), Hsieh
patent: 4435230 (1984-03-01), Fujikura
patent: 4729939 (1988-03-01), Nishikawa et al.
patent: 4822715 (1989-04-01), Shoji et al.

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