Patents Assigned to Diaprint S.r.l.
  • Electrochemical graining of aluminum or aluminum alloy surfaces
    Patent number: 5064511
    Abstract: Aluminum or its alloys are electrochemically grained by using alternate current and an aqueous electrolyte comprising specific amounts of hydrochloric acid and an oxy-acid and/or a dicarboxylic acid, preferably lactic acid and/or succinic acid, respectively. Aluminum (or an alloy thereof) thus grained, can be coated with a photosensitive layer whereby forming a printing plate. Before coating it with the photosensitive layer, the plate can also be anodized by techniques well known to those skilled in the art.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: November 12, 1991
    Assignee: Diaprint S.r.l.
    Inventor: Osvaldo Gobbetti