(19)

(11)

EP 4 308 915 A1

(12)

(43) Date of publication: 24.01.2024 Bulletin 2024/04 (21) Application number: 22771852.5 (22) Date of filing: 08.03.2022

(51) International Patent Classification (IPC):  G01N 29/02(2006.01) D21C 9/18(2006.01) D21C 9/02(2006.01) (52) Cooperative Patent Classification (CPC): G01F 1/66; G01N 29/02; G01N 2291/02836; D21C 9/02; D21C 9/18; D21C 7/02; D21C 7/06; D21C 7/12; G01F 1/667; G01F 1/663 (86) International application number: PCT/SE2022/050223 (87) International publication number: WO 2022/197230 (22.09.2022 Gazette 2022/38)

(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: 19.03.2021 SE 2150320 (71) Applicant: VALMET AB 85 194 Sundsvall (SE)	(72) Inventor: VIKSTRÖM, Tomas 854 60 Sundsvall (SE)