1. Brush sand method: turn round copper wire brush, aluminum plate on the conveyor belt below string move around while walking forward can get sand surface.

2. Grinding method: use offset printing plate grinding machine also eliminated down grinding aluminum plate, just to keep water wash, can obtain detailed luster good sand surface effect.

3. Chemical sand surface treatment: a monopoly of chemical sand surface treatment agent, through chemical processing, sand surface effect of aluminum plate, aluminum plate crystallization fine and uniform.