The strike in the Finnish pulp and paper industry is going on at UPM's facilities. If no agreement has been reached on April 27, a second two-weeks strike will come into force, this time affecting Stora Enso and Metsäliitto, of which M-real is part.The white-collar workers’ over-time ban, affecting the entire pulp and paper industry in Finland, continues.The ongoing white-collar workers’ strike at UPM’s plants in Finland has forced UPM to close its envelope paper machine at Tervasaari mill in Valkeakoski. The production work at the envelope paper machine ended Wednesday, affecting some 40 employees. The Tervasaari mill’s two other paper machines will continue production.Finnish media reports that white-collar workers at Stora Enso's Imatra complex and the maintenance company Efora staged a walkout at 10.00 a m Thursday.