| 摘要 |
PURPOSE:To make a printing plate having printing durability by a simple method by laminating a thermoplastic film shrunk and melted by heating and a silicone layer having ink repellency to porous tissue paper. CONSTITUTION:A master for a waterless planographic plate is formed by succes sively laminating porous tissue paper composed of a natural fiber, a synthetic fiber or a blend thereof, a thin thermoplastic film 3 such as a polyester film, a polypropylene film or a polyvinylidene chloride film and a silicone layer 4 having ink repellency obtained by applying and drying silicone for a release agent or silicone for release paper. When this master is heated by the heating element 6a of a thermal head 6, the thermoplastic film 3 is thermally shrunk and melted to be adsorbed by the thin porous tissue paper 4 but, at this time, the heated region of the silicone layer 4 is also locally destructed to form a recessed part and ink is accumulated in this part at the time of printing. By this method, a waterless planographic printing plate can be easily formed by a simple input means such as a thermal head. |
