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    • 2. 发明授权
    • Two-step method for electrolytically graining lithographic metal plates
    • 电解平版印刷金属板的两步法
    • US4721552A
    • 1988-01-26
    • US43567
    • 1987-04-27
    • Jen-Chi HuangDaniel Bourgeois
    • Jen-Chi HuangDaniel Bourgeois
    • B41N3/03C25F3/04
    • C25F3/04B41N3/034
    • An all electrolytic method for quickly and efficiently producing a well roughened, substantially non-directional, fine honeycomb surface on an aluminum sheet which is characterized by excellent adhesion to coatings and therefore suitable for making lithographic printing plates. The method comprises graining said aluminum sheet with alternating current for less than about 10 seconds in a first aqueous electrolyte solution containing hydrochloric acid, washing and drying the resulting grained aluminum sheet, and then further graining said dried aluminum sheet with alternating current for less than about 10 seconds, preferably 5 to 10 seconds, in a second aqueous electrolyte solution containing nitric acid alone or admixed with hydrochloric acid to obtain the substantially non-directional, fine honeycomb surface on said aluminum sheet.
    • 一种全电解方法,用于在铝板上快速有效地生产粗糙的,基本上无方向性的细小蜂窝表面,其特征在于对涂层具有优异的粘附性,因此适用于制备平版印刷版。 该方法包括在含有盐酸的第一含水电解质溶液中将交替电流稀释至少约10秒钟,洗涤和干燥所得到的粒状铝片,然后用干燥的铝片进一步将所述干燥的铝片以约小于约 10秒钟,优选5〜10秒钟,在单独使用硝酸或与盐酸混合的第二含水电解液中,在铝板上获得基本无定向的细小蜂窝表面。