DS Smith, a leading global manufacturer of sustainable containerboard and specialty papers, has commissioned Voith to rebuild its PM 4 at the company’s Viana site in Northern Portugal. Producing around of 400,000 tons of kraftliner and high-performance top kraftliner per year, the mill is a market leader in Southern Europe. The extensive rebuild will increase production and improve overall efficiency. Production will expand to around 428,000 tons per year with a machine design speed of 1,100 m/min.