| 摘要 |
<p>PROBLEM TO BE SOLVED: To digitize a printing process and make the reuse of a material possible by a method wherein a coating layer including a titanium oxide photocatalyst is formed on the surface of a base material and a painting layer made of a compound, which can be dissolved through the irradiation of the light having an energy higher than the band gap energy of the titanium oxide photocatalyst, is equipped on the coating layer. SOLUTION: On the surface of a base material 1, a coating layer 3 including a titanium oxide photocatalyst is formed. A painting layer 4 made of a compound, winch can be decomposed through the irradiation of the light with the wavelength having an energy higher than the band gap energy of the titanium oxide photocatalyst, is formed on the coating layer 3. At the production of a printing plate material, at the early state, the surface of the coating layer 3 is prepared so as to be hydrophobic. By irradiating ultraiolet rays based on the digital data on an image over the resultant surface of the coating layer 3, the surface of the coating layer 3 is converted to be hydrophilic. Since writing of the image is directly executed with a light as mentioned above, the digitization of the printing plate material can be coped with. Further, since the converting properties of the titanium oxide photocatalyst from its hydrophobic properties to its hydrophilic properties, the reuse of the printing plate material can become possible.</p> |
