(Adds CFO and analyst comments, details) HELSINKI, April 23 (Reuters) - Finnish forestry firm Stora Enso posted a bigger-than-expected jump in first quarter operating profit on Friday but said its paper division fell to a loss as sales dropped 28% from last year. Chief Financial Officer Seppo Parvi told Reuters the closure of two paper mills, which was announced this week, would return the paper business to “satisfactory profitability”. Citing falling paper demand in Europe, Stora Enso had said it would close the mills in Finland and Sweden that employ a total of 1,110 people. But analysts said this might not be enough to improve stem losses from the paper business.