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(11)

EP 4 288 603 A1

(12)

(43) Date of publication: 13.12.2023 Bulletin 2023/50 (21) Application number: 22703919.5 (22) Date of filing: 02.02.2022

(51) International Patent Classification (IPC):  D21H 17/16(2006.01) D21H 17/62(2006.01) D21H 17/68(2006.01) D21H 21/18(2006.01) D21H 17/37(2006.01) D21H 17/67(2006.01) D21H 21/16(2006.01) D21H 23/14(2006.01) (52) Cooperative Patent Classification (CPC): D21H 17/375; D21H 21/16; D21H 21/18; D21H 17/62; D21H 17/67; D21H 17/68; D21H 17/37; D21H 23/14 (86) International application number: PCT/EP2022/052384 (87) International publication number: WO 2022/167437 (11.08.2022 Gazette 2022/32)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 02.02.2021 EP 21154736 22.12.2021 EP 21217014 (71) Applicant: Billerud Aktiebolag (publ) 169 27 Solna (SE)	(72) Inventor: VALTANEN, Eero Antero 33960 PIRKKALA (FI) (74) Representative: Kransell & Wennborg KB  P.O. Box 27834 115 93 Stockholm 115 93 Stockholm (SE)