Apr 22, 2010. /Lesprom Network/. Paper workers strike, started on April, 21 at UPM Kymi paper and pulp mill in Finland, was ended last night at 21 o'clock, company said in a statement received by Lesprom Network. Start up of the production lines was commenced this morning and the mill will be back to normal production within a couple of days. Kymi mill produces coated and uncoated fine paper.