| 摘要 |
A support for a lithographic printing plate obtained by performing surface graining and anodizing of an aluminum alloy plate, wherein the foregoing aluminum alloy plate contains specific contents of Fe, Si, Cu, Ti, Zn and Mg, with the balance being Al and incidental impurities. The presensitized plate obtained from this support for a lithographic printing plate is excellent in press life and in resistance to dot ink stain when processed into a lithographic printing plate. Preferably, the support for a lithographic printing plate, with regard to the surface of the support, has a center line average roughness Ra in the range of 0.2 - 0.6 mu m, a maximum height Rmax in the range of 3.0 - 6.0 mu m, a ten-point mean roughness Rz in the range of 2.0 - 5.5 mu m, a center line peak height Rp in the range of 1.0 - 3.0 mu m, a center line valley depth Rv in the range of 2.0 - 3.5 mu m, a mean spacing Sm in the range of 40 - 70 mu m, an average inclination DELTA a in the range of 6.0 - 12.0 DEG , and a peak count Pc in the range of 100 - 200. |
