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(11)

EP 4 251 537 A1

(12)

(43) Date of publication: 04.10.2023 Bulletin 2023/40 (21) Application number: 21816532.2 (22) Date of filing: 22.11.2021

(51) International Patent Classification (IPC):  B65D 75/32(2006.01) B65D 77/00(2006.01) B65D 77/20(2006.01) B65D 1/48(2006.01) (52) Cooperative Patent Classification (CPC): B65D 77/2024; B65D 77/2004; B65D 75/326; B65D 77/003; B65D 1/48 (86) International application number: PCT/IB2021/060799 (87) International publication number: WO 2022/112915 (02.06.2022 Gazette 2022/22)

(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: 26.11.2020 SE 2051377 (71) Applicant: Stora Enso Oyj 00101 Helsinki (FI)	(72) Inventors: HILTUNEN, Mari 55800 Imatra (FI) LINDFORS, Tim 55400 Imatra (FI) TUKIAINEN, Kati 56120 Salosaari (FI) SALOMIES, Tanja 54120 Lappeenranta (FI) (74) Representative: Steinrud, Henrik  Stora Enso AB Group Intellectual Property Box 9090 65009 Karlstad 65009 Karlstad (SE)