(19)

(11)

EP 3 129 546 A1

(12)

(43) Date of publication: 15.02.2017 Bulletin 2017/07 (21) Application number: 15776194.1 (22) Date of filing: 02.04.2015

(51) International Patent Classification (IPC):  D21C 3/24(2006.01) D21C 7/00(2006.01) D21C 7/14(2006.01) D21C 9/02(2006.01) (86) International application number: PCT/IB2015/052419 (87) International publication number: WO 2015/155642 (15.10.2015 Gazette 2015/41)

(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 (30) Priority: 07.04.2014 US 201461976053 P (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: NÄSMAN, Mats 652 20 Karlstad (SE) LAPATTO, Joni 53900 Lappeenranta (FI) (74) Representative: Lindberg, Berndt Åke  Stora Enso AB Group Intellectual Property Box 9090 650 09 Karlstad 650 09 Karlstad (SE)