Abstract
A study was conducted on the effects of treatment conditions on the plate-making properties and printability of pre-sensitized plates having an electroformed iron foil support. This iron foil support had excellent bending properties when electroformed at 90-95°C in a bath containing 800g/L ferrous chloride. The surface roughness of the iron foil increased linearly with foil thickness, which needed to be at least 15μm in order to be used as the presensitized plate. The amount of chromium deposited on the iron foil required to improve its corrosion resistance was 5mg/dm2. When these chromium-plated iron foils were cathodically treated in a suspension consisting of Al2O3 sol and SiO2 sol, their hydrophilic properties and their adhesion to light-sensitive resins were improved. The amount of aluminum deposit required was 1.0-2.0mg/dm2 and the silicon deposit requirement was 0.4-1.0mg/dm2. The structure of the hydrophilic film was examined by ESCA and X-ray diffraction and was found to consist mainly of Al(OH)3 and SiO2, which are appeared to be amorphous. Pre-sensitized plates supported by these treated iron foil supports were capable of printing 50, 000 sheets without problems of staining, spotting, or scumming.
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