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EP 4 824 347 A1

(12)

(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 24903083.4 (22) Date of filing: 12.12.2024

(51) International Patent Classification (IPC):  D21H 21/16(2006.01) B65D 65/46(2006.01) D21H 27/30(2006.01) B32B 29/00(2006.01) D21H 19/10(2006.01) (52) Cooperative Patent Classification (CPC): D21H 27/30; D21H 21/16; D21H 27/10; D21H 17/60; D21H 17/62; B32B 29/005; B32B 29/06; B32B 2307/7265; B32B 2439/70 (86) International application number: PCT/IB2024/062541 (87) International publication number: WO 2025/126090 (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: 13.12.2023 SE 2330553 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: HANSSON, Susanne 135 54 Tyresö (SE) LYYTIKÄINEN, Katja 55700 Imatra (FI) BACKFOLK, Kaj 53100 Lappeenranta (FI) HEISKANEN, Isto 55100 Imatra (FI) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)