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EP 4 416 335 A1

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(43) Date of publication: 21.08.2024 Bulletin 2024/34 (21) Application number: 22793775.2 (22) Date of filing: 13.10.2022

(51) International Patent Classification (IPC):  D21H 19/12(2006.01) D21H 19/28(2006.01) D21H 21/16(2006.01) B65D 65/42(2006.01) D21H 19/62(2006.01) D21H 27/10(2006.01) (52) Cooperative Patent Classification (CPC): D21H 27/10; D21H 21/16; D21H 19/12; D21H 19/28; D21H 19/62 (86) International application number: PCT/FI2022/050689 (87) International publication number: WO 2023/062285 (20.04.2023 Gazette 2023/16)

(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: 13.10.2021 FI 20216058 (71) Applicant: UPM-Kymmene Corporation 00100 Helsinki (FI)	(72) Inventors: LAINE, Christiane 00100 Helsinki (FI) LITTUNEN, Kuisma 00100 Helsinki (FI) KARJALAINEN, Erno 02150 Espoo (FI) LAHTINEN, Jussi H 02150 Espoo (FI) HARLIN, Ali 02150 Espoo (FI) VÄHÄ-NISSI, Mika 02150 Espoo (FI) ANGHELESCU-HAKALA, Adina 02150 Espoo (FI) (74) Representative: Berggren Oy  P.O. Box 16 Eteläinen Rautatiekatu 10A 00101 Helsinki 00101 Helsinki (FI)