Aluminum or an aluminum alloy support material for use in offset

Details Aluminum or an aluminum alloy support material for use in offset Aluminum or an aluminum alloy support material for use in offset

1987-10-30

1989-08-01

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 33, 204 58, 4284722, 430496, 430526, C25D 544

Patent

active

048530930

ABSTRACT:
There is disclosed a plate-, foil- or web-shaped support material for offset printing plates, made of mill-finished, mechanically and/or chemically or mechanically and electrochemically grained aluminum or an aluminum alloy, which has been anodized in aqueous-alkaline solutions. The support material of the invention shows a reflectometer value, at an angle of incidence of 60.degree. (measured according to DIN 67 530; 1982), of greater than 5, an abrasion of the oxide layer of less than 0.5 g/m.sup.2 and a resistance to alkali of greater than 140 s. Also disclosed is a process for the manufacture of the support material, in which an anodic oxidation is carried out in an electrolyte having a pH greater than or equal to 12.5, at a voltage of less than 50 V.

REFERENCES:
patent: 2287148 (1942-06-01), Taber
patent: 4211619 (1980-07-01), Usbeck
patent: 4634656 (1987-01-01), Ohashi et al.
Wernick and Pinner, "The Surface Treatment and Finishing of Aluminum and Its Alloys", vol. 1, pp. 304-309, Robert Draper Ltd., Teddington, 1972.

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