| 摘要 |
PURPOSE:To obtain the tile plate having favorable quality for use as a planographic plate for back printing, by providing an emulsion layer on a rough surface resin layer, in a both-side resin-coated polyester film provided with a rough surface resin layer and a specular surface resin layer. CONSTITUTION:While subjecting one side of a polyester film to a corona discharge treatment, EEA (having an ethyl acrylate content of 7%, a density of 0.93 and an MI of 4) is extruded from a melt extrusion die at 335 deg.C while using a rough surface forming cooling roll to apply EEA in a thickness of 20mum. In this case, the rough resin surface is subjected to a corona discharge treatment. Then, the other side is also melt extrusion coated with a resin in a thickness of 20mum by using a specular surface forming cooling roll while conducting a corona discharge treatment similar to the above. A planographic emulsion is applied to the rough surface resin layer (in an amount of 6g/m<2> as solid component), and is dried. Thereafter, an original is brought into close contact with the surface of the emulstion layer, exposure and printing are conducted from the side opposite to the side of the emulsion layer surface, and a series of photographic process such as development, fixing and washing with water is conducted to obtain a planographic plate. |
