May 19, 2010. /Lesprom Network/. Graphic Packaging International, Inc. (GPI) announced a European price increase on all grades of its solid unbleached sulphate (SUS®) paperboard, effective with shipments on or after May 31, 2010. The price of all GPI SUS® paperboard will increase by GBP 65 ($94) per ton in the U.K. and Euro 65 per ton in the rest of Europe. Graphic Packaging International, Inc., a subsidiary of Graphic Packaging Holding Company, is a leading provider of paperboard packaging solutions for a wide variety of products to food, beverage and other consumer products companies. The company is one of the largest producers of folding cartons and holds a leading market position in coated-recycled boxboard and specialty bag packaging.