GB445321A - Improvements in printing cylinders - Google Patents

Abstract

445,321. Making composite printing- cylinders. STANDARD PROCESS CORPORATION, 734, Mather Street, Chicago, U.S.A. June 28, 1935, No. 18528. Convention date, Aug. 1, 1934. [Classes 83 (i) and 83 (ii)] [See also Group XVI] Casting processes.-A method of producing or renewing a printing-cylinder, consisting of a metal roll or backing member and a layer of metal or alloy having properties suitable for a printing-surface, comprises uniting the base roll or backing member and the layer metal at the temperature of fusion of the base roll or backing member. The base-roll 9 is cleaned by abrasive or by pickling in hydrochloric or hydrofluoric acid, heated to its melting point, and dipped in a bath of molten copper, or fumed in the vapours of molten tin, zinc, or the like. A thin welded film 12 is thus formed on the surface of the base-roll. The roll may then be centred in a suitable mould and molten copper, brass, bronze, or zinc is poured in to form the layer 11, which extends across the ends of the base-roll at 14. The base-roll may be kept in a neutral atmosphere prior to, and during casting, or the casting may be performed in vacuo. The copper layer 11 may be electrolytically deposited on the welded film 12. Alternatively, the copper layer is preformed as a shell, the inner surface is coated with a protective paint containing aluminium, and the base-roll is cast within it. After an intaglio roll has been used and the surface has been ground off, a new surface may be applied by the method described, or may be electrically deposited on a film welded to the base-roll.