| abstract |
(57) [Summary] [Constitution] Manufacture of an aluminum support for a lithographic printing plate, comprising a brush graining step of roughening the surface of an aluminum plate with at least two kinds of brushes having different bristles. Method. [Effect] Since stains and crushing of shadow portions are less likely to occur on the printing machine, it is easy for non-skilled persons to print, and higher quality and more stable printed matter than conventional ones can be obtained. |