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(11)

EP 4 739 840 A1

(12)

(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 24835515.8 (22) Date of filing: 02.07.2024

(51) International Patent Classification (IPC):  D21H 27/38(2006.01) D21F 3/02(2006.01) D21H 11/18(2006.01) D21H 11/10(2006.01) B32B 29/00(2006.01) D21H 11/08(2006.01) D21H 11/00(2006.01) D21H 21/18(2006.01) (52) Cooperative Patent Classification (CPC): D21H 11/18; D21H 21/18; D21H 27/38; D21F 11/04; B32B 29/005; B32B 2250/03; B32B 2250/26; B32B 2307/54; D21H 27/10; D21H 27/30 (86) International application number: PCT/IB2024/056456 (87) International publication number: WO 2025/008746 (09.01.2025 Gazette 2025/02)

(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: GE KH MA MD TN (30) Priority: 05.07.2023 SE 2330311 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: BACKFOLK, Kaj 53100 Lappeenranta (FI) MOBERG, Anders 66341 Hammarö (SE) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)