| 摘要 |
A printing plate material capable of being recycled in response to digitizing printing processes and a method of regenerating it. The printing plate material used is produced by forming on a base material a coat layer containing titanium oxide photocatalyst and one or at least two of Fe<2+>, Ni<2+>, Mn<2+>, Cr<3+> and Cu<2+>. In an initial condition of plate making, the plate material surface is conditioned to show a hydrophobic condition. An ultraviolet ray is applied onto the surface to convert part of the surface into a hydrophilic portion. The conversion is conducted based on digital data in conformity with an image to be printed, thereby using a hydrophobic portion as a printing image portion and a hydrophilic portion as a non-printing image portion. After printing, the above compound is applied again to convert the coat layer surface into an initial condition of plate making where the surface shows a hydrophobicity again.
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