(19)

(11)

EP 4 824 343 A1

(12)

(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 24833531.7 (22) Date of filing: 16.12.2024

(51) International Patent Classification (IPC):  D21H 11/04(2006.01) D21H 17/67(2006.01) D21H 19/40(2006.01) D21H 19/84(2006.01) D21H 17/28(2006.01) D21H 19/38(2006.01) D21H 19/54(2006.01) D21H 27/10(2006.01) (52) Cooperative Patent Classification (CPC): D21H 11/04; D21H 17/28; D21H 17/67; D21H 19/54; D21H 19/84; D21H 19/385; D21H 19/40; D21H 27/10; D21H 19/82 (86) International application number: PCT/EP2024/086632 (87) International publication number: WO 2025/125687 (19.06.2025 Gazette 2025/25)

(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: 15.12.2023 US 202318541551 (71) Applicant: Billerud Aktiebolag (publ) 169 27 Solna (SE)	(72) Inventors: BOBART, Cassandra Quinnesec, Michigan (US) SHULTZ, James Keyser, West Virginia 26726 (US) (74) Representative: Kransell & Wennborg KB  P.O. Box 27834 115 93 Stockholm 115 93 Stockholm (SE)