Sonoco has acquired Plastic Packaging Inc. (PPI), a privately held Hickory, NC-based flexible packaging company.   Founded in 1957, PPI specializes in short-run, customized flexible packaging for consumer brands in markets including: • Food products (i.e. frozen foods, baked goods, seafood). • Pet products (i.e. dry food, bird seed, litter). • Confection (i.e. seasonal promotions, heat-sealed chocolate packaging, hard and soft candy). • Health and personal care (i.e. nutraceuticals, diaper...