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(11)

EP 3 350 368 A1

(12)

(43) Date of publication: 25.07.2018 Bulletin 2018/30 (21) Application number: 16779156.5 (22) Date of filing: 16.09.2016

(51) International Patent Classification (IPC):  D21C 9/00(2006.01) D21H 11/16(2006.01) D21D 1/20(2006.01) D21H 11/18(2006.01) (86) International application number: PCT/FI2016/050643 (87) International publication number: WO 2017/046455 (23.03.2017 Gazette 2017/12)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 16.09.2015 FI 20155666 (71) Applicant: UPM-Kymmene Corporation 00100 Helsinki (FI)	(72) Inventors: KAJANTO, Isko 02200 Espoo (FI) KOSONEN, Mika 53550 Lappeenranta (FI) NUOPPONEN, Markus 02200 Helsinki (FI) (74) Representative: Berggren Oy, Tampere  Visiokatu 1 33720 Tampere 33720 Tampere (FI)