Patent ID: 6613496
Filing Date: 2003-09-02
Classification: B41C,Y10S

Abstract:
A method for forming a dampening-waterless lithographic plate comprising:an irradiation step of irradiating a dampening-waterless lithographic blank plate imagewise with a laser beam, the dampening-waterless lithographic blank plate comprising a support, a photothermal conversion layer provided on the support, said photothermal conversion layer being a film containing at least one substance selected from the group consisting of titanium, titanium oxide, and titanium nitride, and an ink-repellent layer provided on the photothermal conversion layer wherein the laser beam passes through the ink-repellent layer and is converted to heat by the photothermal conversion layer; a first rubbing step of rubbing the surface of the ink-repellent layer without use of a liquid so as to remove a portion of the ink-repellent layer in areas irradiated with a laser beam; and a second rubbing step of rubbing the surface of the dampening-waterless lithographic plate through use of a liquid so as to substantially completely remove pieces of the ink-repellant layer adhered onto the surface of the dampening-waterless lithographic plate and remaining portions of the ink-repellant layer, which have not been removed by the first rubbing step, in the areas which were irradiated with the laser beam.