| 摘要 |
<p>The present invention relates to a planographic original plate having a new image receptive layer and a new preparation method for a printing plate using the same. In the direct drawing type planographic original plate, at least one image receptive layer containing a photocatalytic metallic oxide is provided on a substrate, or a silicone layer on the substrate and an image receptive layer containing a photocatalytic titanium oxide are provided. The preparation method for a printing plate according to the present invention is a method comprising the steps of forming an oleophilic image on said original plate, and applying sunlight or ultraviolet ray to ultra-hydrophilize a non-image area to thereby obtain a printing plate. According to the present invention, after forming an image on an image receptive layer, the non-image area is ultra-hydrophilized by only sunlight or ultraviolet exposure, whereby an excellent printing plate can be easily obtained. Further, a direct drawing planographic original plate which has been ultra-hydrophilized can be used as a printing plate as it is by only drawing an image.</p> |
