Every four years, the printing industry heads to Dusseldorf, Germany for drupa, the huge two-week Attendees check out one of Heidelberg’s halls. showcase for printing. drupa 2008 was another huge show, with nearly 391,000 visitors from 138 countries checking out the 1,971 exhibits.      The ink industry was well represented at drupa 2008, with many of the leading international ink companies in attendance and some intriguing new technologies on display.     Sun Chemical h...