METHOD FOR MANUFACTURING CYLINDRICAL PRINTING ORIGINAL PLATE ON WHICH LASER ENGRAVING IS POSSIBLE

摘要

PROBLEM TO BE SOLVED: To manufacture a cylindrical flexographic printing original plate on which laser engraving is possible by photo-curing a liquid photosensitive resin composition having a very low light transmittance to ultraviolet light including light in a wavelength region of 200-450 nm under the above ultraviolet light. SOLUTION: A method for manufacturing the cylindrical printing original plate includes (i) a step of forming a photosensitive resin layer (B) of 0.01-0.3 mm thickness on a cylindrical support (A) by applying the photosensitive resin composition which is liquid at 20°C; and (ii) a step of forming a photosensitive resin cured object layer (C) on which laser engraving is possible by irradiating the formed photosensitive resin layer with light in the air, wherein the photosensitive resin layer (B) contains a near-infrared laser beam absorbent (g) having light absorption in an ultraviolet region of 200-400 nm and a light transmittance at 365 nm or 423 nm wavelength is 0.1-30%. COPYRIGHT: (C)2005,JPO&NCIPI