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(11)

EP 4 463 594 A1

(12)

(43) Date of publication: 20.11.2024 Bulletin 2024/47 (21) Application number: 23700310.8 (22) Date of filing: 05.01.2023

(51) International Patent Classification (IPC):  D21D 1/20(2006.01) D21D 1/30(2006.01) D21D 1/22(2006.01) D21D 1/00(2006.01) (52) Cooperative Patent Classification (CPC): D21D 1/20; D21D 1/22; D21D 1/30; D21D 1/002 (86) International application number: PCT/FI2023/050014 (87) International publication number: WO 2023/135362 (20.07.2023 Gazette 2023/29)

(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: 11.01.2022 FI 20225018 (71) Applicant: Valmet Technologies Oy 02150 Espoo (FI)	(72) Inventors: ARONEN, Juha 33840 Tampere (FI) SAUKKO, Pekka 33840 Tampere (FI) (74) Representative: Kolster Oy Ab  Salmisaarenaukio 1 P.O. Box 204 00181 Helsinki 00181 Helsinki (FI)