| 摘要 |
PURPOSE:To obtain a photographic printing paper good in smoothness by forming a paper layer having a specified void volume due to a specified pore diameter. CONSTITUTION:A paper layer to be used here has a void volume of >=0.04ml/g due to pore diameters of <=0.4mum measured by the Hg pressure injection method. The void of such pore diameters of <=0.4mum contributes to increase of flexibility of fibers, and the larger the void of <=0.4mum, the higher the effect, and satisfactory smoothness is obtained in the range of the void exceeding 0.04ml/g. In such paper, interlayers between thin layers on the inside of the fiber wall are loosened, and junction between each fiber has not grown, so the fibers collapse well to provide good smoothness. A photographic printing paper support having good surface smoothness is obtained by coating the surface of such paper with a PE resin or the like by the extrusion coating method, and it can be used for the support of color and black-and-white photographic printing papers, and a photocomposing paper, etc. |
