(19)

(11)

EP 3 810 852 A1

(12)

(43) Date of publication: 28.04.2021 Bulletin 2021/17 (21) Application number: 19819664.4 (22) Date of filing: 12.06.2019

(51) International Patent Classification (IPC):  D21C 9/00(2006.01) D21C 9/18(2006.01) D21C 3/02(2006.01) D21C 9/02(2006.01) D21C 11/00(2006.01) (86) International application number: PCT/SE2019/050554 (87) International publication number: WO 2019/240659 (19.12.2019 Gazette 2019/51)

(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: 15.06.2018 SE 1850733 (71) Applicant: VALMET AB 851 94 Sundsvall (SE)	(72) Inventor: WILGOTSON, Fredrik Chonburi, 202 30 (TH)