(19)

(11)

EP 4 121 695 A1

(12)

(43) Date of publication: 25.01.2023 Bulletin 2023/04 (21) Application number: 21721138.2 (22) Date of filing: 02.03.2021

(51) International Patent Classification (IPC):  F23G 7/04(2006.01) F23L 1/00(2006.01) D21C 11/12(2006.01) F23M 5/08(2006.01) (52) Cooperative Patent Classification (CPC): D21C 11/12; F23G 7/04; F23M 5/08; F23L 1/00 (86) International application number: PCT/FI2021/050151 (87) International publication number: WO 2021/186100 (23.09.2021 Gazette 2021/38)

(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: 19.03.2020 FI 20205283 (71) Applicant: CPL Works Oy 46860 Keltakangas (FI)	(72) Inventors: KURKI, Kalevi 56550 Niskapietilä (FI) MÄNTTÄRI, Ilkka 78850 Varkaus (FI) (74) Representative: LEITZINGER OY  c/o Spaces Mannerheiminaukio 1A 00100 Helsinki 00100 Helsinki (FI)