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    • 3. 发明授权
    • Lithographic plate of tin-plated steel and method of manufacture
    • 镀锡钢板及其制造方法
    • US4287288A
    • 1981-09-01
    • US10398
    • 1979-02-08
    • Marcel PigeonYannick de Maquille
    • Marcel PigeonYannick de Maquille
    • B41N3/03G03F7/08B41N1/10G03C1/74G03F7/10
    • B41N3/03Y10S205/917Y10S205/921
    • A method of making a presensitized lithographic plate is disclosed wherein a steel support having a tin-plated layer is depassivated and coated with a photosensitive product. Depassivation is accomplished by immersion of the support in an electrolytic bath of sodium carbonate. The electrolysis is performed with the support as a cathode and reversed so that the support is an anode of the bath. Preferably, the bath is an aqueous solution of 50 grams per liter of sodium carbonate at a temperature of 65.degree. C. with a current density of the bath being approximately 2.5 amperes per dm.sup.2. It is also contemplated that the depassivated tin-plated layer may be coated with copper before application of the photosensitive product. This can be accomplished by immersion in an electrolytic bath of copper cyanide. Preferably, the copper cyanide bath is at a temperature of 65.degree. C. with immersion occurring for approximately 3 minutes with the support in the cathode position and having a current density of 2.5 amperes per dm.sup.2. This results in a copper coating of approximately 3-4 microns in thickness. The copper coating may be passivated before the photosensitive product is added by a coating of aqueous benzotriazole solution.The photosensitive product may be a diazo resin of the orthoquinone diazide type condensed with a formophenolic resin. Over the diazo resin, after development a firing solution which is subsequently annealed may be added. Alternatively, the depassivation of the tin-plated layer may be accomplished by wet brushing in the presence of an aqueous pounce solution followed by impregnation with a hydrochloric acid and stannous chloride solution.Alternatively, a chromium layer may also be applied to the depassivated tin-plated layer before application of the photosensitive product. Such is accomplished in an electrolytic chromium bath containing chromic acid and sulfuric acid, the support being in a cathode position and the bath having a current density of approximately 20 amperes per dm.sup.2. It is also contemplated that the photosensitive product may be a photopolymer of a cellulose acetate layer coated with a photopolymer. This results in a lithographic plate comprising oleophilic zones of a photopolymer or copper and hydrophilic zones of chromium or tin.
    • 公开了一种制造预敏化平版印刷板的方法,其中具有镀锡层的钢支架被钝化并涂覆有感光产品。 通过将载体浸入碳酸钠的电解浴中来实现钝化。 电解是用载体作为阴极进行的并且反转,使得载体是浴的阳极。 优选地,浴是在65℃的温度下为50克/升碳酸钠的水溶液,浴的电流密度为约2.5安培/ dm 2。 还可以设想,在施加光敏产物之前,去钝化的镀锡层可以用铜涂覆。 这可以通过浸入氰化铜电解槽来实现。 优选地,氰化铜浴的温度为65℃,浸渍在阴极位置并且具有2.5安培/ dm 2的电流密度浸泡发生约3分钟。 这导致厚度约3-4微米的铜涂层。 在通过苯并三唑水溶液的涂层加入感光产品之前,可以将铜涂层钝化。 感光产品可以是与苯酚酚醛树脂缩合的重氮二叉型重氮树脂。 在重氮树脂上,在显影后,可以加入随后退火的焙烧溶液。 或者,镀锡层的钝化可以通过在水溶液浸渍溶液的存在下进行湿法刷洗,然后用盐酸和氯化亚锡溶液浸渍来完成。