For the printing ink industry, 2008 was a challenging year, as the economic downturn combined with increasing raw material costs made for a difficult year.     Felipe Mellado, chief marketing officer, Sun Chemical, said that 2008 presented another challenging business year to the graphic arts and printing industry.     “In that kind of environment, Sun Chemical’s focus was on helping our customers grow their businesses and succeed,” Mr. Mellado said. “That means working for ...