Process for producing base material for an aluminum offset print

Details Process for producing base material for an aluminum offset print Process for producing base material for an aluminum offset print

1990-05-23

1991-04-23

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 115A, 204 33, 204 27, 204 376, 204 383, C22F 104

Patent

active

050097229

ABSTRACT:
The invention is directed toward a base material for aluminum offset printing plates having improved heat stability comprising an aluminum alloy consisting of from about 0.2 to about 0.6% by weight of iron, less than about 0.25% by weight silicon and copper combined, from about 0.1 to about 0.3% by weight manganese and the remainder being aluminum and trace production impurities, said base material further characterized as containing secondary precipitates in the form of phases of the Al Mn Si: Al Fe: Al Mn type which bear a ratio to one another of from about 1:1:2 to about 1:1:3, the mean particle size being from about 0.25 to about 0.010 micron with a maximum particle size of less than about 0.3 micron and further containing a precipitation structure with a degree of dispersion of less than about 50 phases per cubic micron and a process for producing such material. The sheet material according to this invention may be uniformly roughened in either HCl or HNO.sub.3 electrolyte baths under very similar process parameters.

REFERENCES:
patent: 3911819 (1975-10-01), Pryor et al.
patent: 3944439 (1976-03-01), Pryor et al.
patent: 4098619 (1978-07-01), Franz
patent: 4686083 (1987-08-01), Takizawa et al.

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