Lithographic printing plate support

US8419923B2 · kind B2 · utility

Assignee

• AGFA GRAPHICS NV · BE

Inventors

• Dirk Verdyck · Merksem, BE
• Paola Campestrini · Ekeren, BE
• Marc De Temmerman · Sint-Niklaas, BE

Key dates

• Filing date: Jul 6, 2007
• Grant date: Apr 16, 2013
• Expiry date: Jun 22, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25F3/04
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for making a lithographic printing plate support is disclosed comprising the steps of: (i) providing an aluminum support; (ii) treating said support in an aqueous solution; (iii) graining said treated support in an electrolyte solution by applying an alternating voltage thereby inducing a local current density J; characterized in that said local current density J at time t fulfills the following equation: J(t)≦a+bQ(t) for t=o to t=tf and wherein Q(t) is the integrated value of the absolute value of the local current density at time t:(I)—a is equal to 5—b is equal to 10—and tf is the time necessary to obtain a value of Q(t) equal to 50 C/dm2.