(19)

(11)

EP 4 448 869 A1

(12)

(43) Date of publication: 23.10.2024 Bulletin 2024/43 (21) Application number: 22839225.4 (22) Date of filing: 14.12.2022

(51) International Patent Classification (IPC):  D21H 19/82(2006.01) D21H 27/10(2006.01) (52) Cooperative Patent Classification (CPC): D21H 27/10; D21H 19/82; D21H 19/822 (86) International application number: PCT/EP2022/085973 (87) International publication number: WO 2023/111088 (22.06.2023 Gazette 2023/25)

(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: KH MA MD TN (30) Priority: 14.12.2021 EP 21214389 (71) Applicant: Billerud Aktiebolag (publ) 169 27 Solna (SE)	(72) Inventors: LINDSTRÖM, Ove 952 91 Kalix (SE) LINDBERG, Erik 952 93 Kalix (SE) (74) Representative: Kransell & Wennborg KB  P.O. Box 27834 115 93 Stockholm 115 93 Stockholm (SE)