(19)

(11)

EP 4 547 905 A1

(12)

(43) Date of publication: 07.05.2025 Bulletin 2025/19 (21) Application number: 23748558.6 (22) Date of filing: 29.06.2023

(51) International Patent Classification (IPC):  D21C 9/10(2006.01) D21C 9/16(2006.01) (52) Cooperative Patent Classification (CPC): D21C 9/10; D21C 9/163 (86) International application number: PCT/FI2023/050404 (87) International publication number: WO 2024/003457 (04.01.2024 Gazette 2024/01)

(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: 29.06.2022 FI 20225592 (71) Applicant: Andritz Oy 00180 Helsinki (FI)	(72) Inventors: HAATAINEN, Tiina 78250 Varkaus (FI) VEHMAA, Janne 48601 Kotka (FI) (74) Representative: Devine, Christopher  Andritz Oy Tammasaarenkatu 1 00180 Helsinki 00180 Helsinki (FI)