(19)

(11)

EP 3 802 948 A1

(12)

(43) Date of publication: 14.04.2021 Bulletin 2021/15 (21) Application number: 19735610.8 (22) Date of filing: 07.06.2019

(51) International Patent Classification (IPC):  D21C 9/04(2006.01) (86) International application number: PCT/FI2019/050445 (87) International publication number: WO 2019/234306 (12.12.2019 Gazette 2019/50)

(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: KH MA MD TN (30) Priority: 08.06.2018 FI 20185526 (71) Applicant: Andritz Oy 00180 Helsinki (FI)	(72) Inventor: TOLONEN, Paavo 57101 Savonlinna (FI) (74) Representative: Timonen, Tuomo Markus Antero  Andritz Oy Patent Department P.O. Box 500 48601 Kotka 48601 Kotka (FI)