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(11)

EP 4 771 219 A1

(12)

(43) Date of publication: 08.07.2026 Bulletin 2026/28 (21) Application number: 24765128.4 (22) Date of filing: 02.09.2024

(51) International Patent Classification (IPC):  D21H 19/38(2006.01) D21H 19/54(2006.01) D21H 19/84(2006.01) D21H 19/40(2006.01) D21H 19/82(2006.01) D21H 27/10(2006.01) (52) Cooperative Patent Classification (CPC): D21H 19/54; D21H 19/82; D21H 19/84; D21H 19/38; D21H 19/40; D21H 27/10 (86) International application number: PCT/EP2024/074454 (87) International publication number: WO 2025/046135 (06.03.2025 Gazette 2025/10)

(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: 31.08.2023 EP 23194745 (71) Applicant: Billerud Aktiebolag (publ) 169 27 Solna (SE)	(72) Inventors: CARLSSON, Gilbert 18331 Täby (SE) LARSSON, Johan A. 80598 Gävle (SE) (74) Representative: Kransell & Wennborg KB  P.O. Box 27834 115 93 Stockholm 115 93 Stockholm (SE)