Sonoco, the largest producer of paper-based tubes and cores in North America, announced that it will raise the price for all paperboard tubes and cores by 6% to 8% (6%-8%), effective with shipments in the U.S. and Canada beginning Sept. 14, 2015.   “The price increase is necessary due to the recent increase in the price of our primary raw material, uncoated recycled paperboard (URB),” said Adam Wood, VP, Global Tubes and Cores. “This URB price increase, combined with continued rising operating...