Support for lithographic printing plate and lithographic printin

Details Support for lithographic printing plate and lithographic printin Support for lithographic printing plate and lithographic printin

1983-06-01

1985-10-15

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412918, C25F 300, C25F 304

Patent

active

045472742

ABSTRACT:
A lithographic printing plate support and a process for producing it are disclosed. The plate is produced by providing an aluminum alloy material which is comprised of 0.20 to 1.0% Fe, 0.005 to 0.1% of an element selected from the group consisting of Sn, In, Ga and Zn and the remainder being aluminum. The alloy may further contain 0.1 to 2% Cu. After providing the aluminum material either or both of its surfaces are subjected to a chemical etching treatment in order to provide a uniform and dense grain structure on the surface forming primary pits in the surface having a particularly defined average size. The surface is then subjected to electrochemical etching treatment in an acidic electrolytic solution in order to provide secondary pits on the surface also having a particularly defined average size. The support base may be further treated to provide in additional coating thereon or directly coated with a light-sensitive layer in order to provide a light-sensitive lithographic printing plate. By providing the particular alloy material and subjecting it to the disclosed treatment the light-sensitive layer has good adhesion with respect to the support.

REFERENCES:
patent: 3935080 (1976-01-01), Gumbinner
patent: 3980539 (1976-09-01), Lloyd
patent: 4198278 (1980-04-01), Mehada
patent: 4301229 (1981-11-01), Sakaki
patent: 4367124 (1983-01-01), Kikuchi
patent: 4427500 (1984-01-01), Platzer

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