Planographic printing method, original printing plate and printing press

An original plate for planographic printing having photo catalyst power and used for printing by a planographic printing method, comprising the steps of:

• uniformly providing a layer of a hydrophobic substance on an original printing plate having photo catalyst power;
• forming distributions of hydrophilic and hydrophobic areas as per image by heating the surface of said original plate to a temperature ranging from 40 through 200° C. and irradiating activation light thereonto;
• and
• performing printing by said hydrophobic areas accepting printing ink.

An planographic printing press, comprising:

• a mounting section for mounting an original printing plate having photo catalyst power;
• a processing section for hydrophobically processing the entire surface of said original plate on which a layer of a hydrophobic substance is provided;
• an activation light irradiation section for irradiating activation light one of on said original printing plate carrying the layer of said hydrophobic substance as per image and on the entire surface thereof;
• a heating section for heating said original plate during irradiating said activation light so that the temperature of the surface of said original plate becomes 40 through 200° C. one of as per image and on the entire surface thereof, so that a hydrophobic area and a hydrophilic area are formed on said original plate;
• a section for supplying an ink to said hydrophobic area and for supplying a damping solution to said hydrophilic area;
• and
• a printing section for printing by bringing a printing surface, on which said hydrophobic area accepts the ink and said hydrophilic area accepts the damping solution, into contact with a surface to be printed.