(19)

(11)

EP 4 739 503 A1

(12)

(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 24835514.1 (22) Date of filing: 01.07.2024

(51) International Patent Classification (IPC):  B32B 29/00(2006.01) B32B 27/36(2006.01) D21H 19/00(2006.01) B32B 27/10(2006.01) B65D 65/40(2006.01) D21H 27/10(2006.01) (52) Cooperative Patent Classification (CPC): B32B 27/10; B32B 27/36; D21H 27/10; D21H 19/82; D21H 19/28; D21H 19/08; D21H 19/22; D21H 17/28; D21H 17/36; D21H 17/24; D21H 17/25; D21H 11/18; B32B 2307/718; B32B 2307/538; B32B 2307/72; B32B 2307/7163; B32B 29/005; B32B 2255/12; B32B 2255/28; B32B 2255/26; B32B 2439/70; B32B 2553/00 (86) International application number: PCT/IB2024/056396 (87) International publication number: WO 2025/008733 (09.01.2025 Gazette 2025/02)

(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: 05.07.2023 SE 2330312 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: CUNHA, Gisela 131 34 Nacka (SE) BACKFOLK, Kaj 531 00 Lappeenranta (FI) NYFLÖTT, Åsa 654 57 Karlstad (SE) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)