| 摘要 |
<p>A method for preparing a lithographic printing plate which involves providing a plate precursor comprising a grained and anodised aluminium substrate coated with a metallic layer, preferably a silver layer, imagewise exposing this precursor by means of a high intensity laser beam, and treating the exposed surface of the plate with a chemical composition in order to enhance the oleophilic character of image areas and the hydrophilic character of non-image areas. On exposure of the plate precursor, removal of the metallic layer occurs in the exposed areas. The method provide press ready plates showing high image quality, good press properties and high durability on press, whilst eliminating the requirement of the use of intermediate film and developer chemistry.</p> |
