(19)

(11)

EP 4 416 331 A1

(12)

(43) Date of publication: 21.08.2024 Bulletin 2024/34 (21) Application number: 22792834.8 (22) Date of filing: 07.10.2022

(51) International Patent Classification (IPC):  D21D 1/30(2006.01) (52) Cooperative Patent Classification (CPC): D21D 1/306 (86) International application number: PCT/FI2022/050668 (87) International publication number: WO 2023/062273 (20.04.2023 Gazette 2023/16)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 12.10.2021 FI 20216057 (71) Applicant: Valmet Technologies Oy 02150 Espoo (FI)	(72) Inventors: SJÖSTRÖM, Håkan 37601 Valkeakoski (FI) VIRTANEN, Jukka 37601 Valkeakoski (FI) (74) Representative: Kolster Oy Ab  Salmisaarenaukio 1 P.O. Box 204 00181 Helsinki 00181 Helsinki (FI)