(19)

(11)

EP 4 165 246 A1

(12)

(43) Date of publication: 19.04.2023 Bulletin 2023/16 (21) Application number: 21734881.2 (22) Date of filing: 10.06.2021

(51) International Patent Classification (IPC):  D21H 19/22(2006.01) D21H 19/60(2006.01) D21H 23/34(2006.01) D21H 27/00(2006.01) D21H 19/82(2006.01) D21H 23/56(2006.01) (52) Cooperative Patent Classification (CPC): D21H 27/001; D21H 19/82; D21H 19/22; D21H 19/60; D21H 23/56; D21H 23/34 (86) International application number: PCT/FI2021/050436 (87) International publication number: WO 2021/255333 (23.12.2021 Gazette 2021/51)

(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: 15.06.2020 FI 20205625 (71) Applicant: UPM-Kymmene Corporation 00100 Helsinki (FI)	(72) Inventors: LITTUNEN, Kuisma 53900 Lappeenranta (FI) KOSONEN, Harri 53300 Lappeenranta (FI) ANTILA, Janne 13100 Hämeenlinna (FI) RISSANEN, Mikko 02750 Espoo (FI) (74) Representative: Berggren Oy  P.O. Box 16 Eteläinen Rautatiekatu 10A 00101 Helsinki 00101 Helsinki (FI)