Sun Chemical announced it will raise prices on packaging, commercial and screen inks sold in North America, effective Jan. 1, 2007. Prices on packaging inks will rise 4 percent to 6 percent, while prices on commercial and screen inks will go up 8 percent.       “Despite our efforts to mitigate the impact of the rising costs in raw materials through active involvement with our supplier base and by driving internal efficiencies, we continue to face significant increases in all of our manufactur...