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(11)

EP 4 298 278 A1

(12)

(43) Date of publication: 03.01.2024 Bulletin 2024/01 (21) Application number: 22708576.8 (22) Date of filing: 04.02.2022

(51) International Patent Classification (IPC):  D21F 9/00(2006.01) D21H 23/22(2006.01) D21F 11/04(2006.01) (52) Cooperative Patent Classification (CPC): D21F 9/006; D21F 11/04; D21H 23/56; D21H 23/48; D21H 21/16 (86) International application number: PCT/FI2022/050071 (87) International publication number: WO 2022/180299 (01.09.2022 Gazette 2022/35)

(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: 23.02.2021 FI 20215196 (71) Applicant: Valmet Technologies Oy 02150 Espoo (FI)	(72) Inventor: PIETIKÄINEN, Reijo 04400 Järvenpää (FI) (74) Representative: Berggren Oy  P.O. Box 16 Eteläinen Rautatiekatu 10A 00101 Helsinki 00101 Helsinki (FI)