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EP 4 486 947 A1

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(43) Date of publication: 08.01.2025 Bulletin 2025/02 (21) Application number: 23763063.7 (22) Date of filing: 23.02.2023

(51) International Patent Classification (IPC):  D21H 19/08(2006.01) B32B 37/02(2006.01) B82Y 30/00(2011.01) C23C 14/56(2006.01) D21H 19/34(2006.01) B32B 27/10(2006.01) C08J 7/048(2020.01) C23C 14/20(2006.01) D21H 11/18(2006.01) D21H 21/52(2006.01) (52) Cooperative Patent Classification (CPC): B82Y 30/00; C23C 14/20; D21H 11/18; D21H 19/08; D21H 19/34; D21H 27/10; B32B 2255/26; B32B 29/007; B32B 2266/02; B32B 2307/724; B32B 2307/7244; B32B 2307/748; B32B 2307/718; B32B 5/18; B32B 2255/20; B32B 2307/72; B32B 2255/28; B32B 2255/205; B32B 2439/70; B32B 7/12; B32B 29/005; B32B 2255/24; B32B 2307/546; B32B 2255/10; B32B 2307/7246; B32B 27/10; C23C 14/0005; C23C 14/024 (86) International application number: PCT/IB2023/051668 (87) International publication number: WO 2023/166388 (07.09.2023 Gazette 2023/36)

(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: 02.03.2022 SE 2250284 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: HEISKANEN, Isto 55100 Imatra (FI) NORDSTRÖM, Tommi 20880 Turku (FI) BACKFOLK, Kaj 53100 Lappeenranta (FI) KANKKUNEN, Jukka 55800 Imatra (FI) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)