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EP 4 341 089 A1

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(43) Date of publication: 27.03.2024 Bulletin 2024/13 (21) Application number: 22804142.2 (22) Date of filing: 13.05.2022

(51) International Patent Classification (IPC):  B32B 29/08(2006.01) D21H 21/10(2006.01) D21H 27/40(2006.01) D21C 9/02(2006.01) D21H 21/16(2006.01) D21H 21/20(2006.01) (52) Cooperative Patent Classification (CPC): D21H 21/10; D21H 21/20; D21H 21/16; D21H 27/40 (86) International application number: PCT/IB2022/054480 (87) International publication number: WO 2022/243820 (24.11.2022 Gazette 2022/47)

(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: 17.05.2021 SE 2150621 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: HEISKANEN, Isto 55100 Imatra (FI) BACKFOLK, Kaj 53100 Lappeenranta (FI) KANKKUNEN, Jukka 55800 Imatra (FI) SIPPUS, Tuomo 15610 Lahti (FI) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)