PROCESS FOR THE SURFACE TREATMENT OF ALUMINUM SUPPORT FOR PRINTING PLATE

摘要

Disclosed is a process for the surface treatment of an aluminum support for printing plate which comprises a step of brush-graining with an abrasive brush and an abrasive slurry, characterized in that as the abrasive there is used aluminum hydroxide, the aluminum hydroxide which has been used in graining is dissolved in a sodium aluminate solution and the sodium aluminate solution having a raised supersaturation degree, the aluminum hydroxide which has been left undissolved and seed crystal aluminum hydroxide undergo hydrolysis reaction to produce crystalline aluminum hydroxide which is then purified and recovered. The above process for the surface treatment of an aluminum support for printing plate can realize the reduction of the discharged amount of waste from the step of surface treatment of an aluminum plate as a lithographic printing plate support and the used amount of chemicals and abrasive to allow an extremely inexpensive stable production of an aluminum support for printing plate as compared with the prior art.