Process for roughening support material for printing plates

A support material made from aluminum or an aluminum alloy for printing plates has a prestamped surface. The prior stamping comprises hemispherical indentations with a diameter of from 2 to 50 mum and a mean diameter of 20 to 30 mum. This support material is electrochemically roughened in an electro...

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Bibliographische Detailangaben
Hauptverfasser:	PLIEFKE ENGLEBERT, JOERG KLAUS, BRENK MICHAEL
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR APPARATUS THEREFOR CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CHEMISTRY CINEMATOGRAPHY ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY ELECTROFORMING ELECTROGRAPHY ELECTROLYTIC OR ELECTROPHORETIC PROCESSES HOLOGRAPHY LINING MACHINES MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING,INKING, DAMPING, OR THE LIKE MATERIALS THEREFOR METALLURGY ORIGINALS THEREFOR PERFORMING OPERATIONS PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHYSICS PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM PRINTED CIRCUITS PRINTING PRINTING PLATES OR FOILS PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A support material made from aluminum or an aluminum alloy for printing plates has a prestamped surface. The prior stamping comprises hemispherical indentations with a diameter of from 2 to 50 mum and a mean diameter of 20 to 30 mum. This support material is electrochemically roughened in an electrolyte which is selected from the group consisting of hydrochloric acid, nitric acid, sulphuric acid and chloride or nitrate ions of an aluminum salt. The current density of the alternating current is 30 to 45 A/dm2. The surface roughness RA after roughening is uniform, covers the entire area and lies in the range from 1.0 to 1.5 mum.