(19)

(11)

EP 3 678 819 A1

(12)

(43) Date of publication: 15.07.2020 Bulletin 2020/29 (21) Application number: 18852917.6 (22) Date of filing: 30.08.2018

(51) International Patent Classification (IPC):  B24B 55/10(2006.01) B24B 23/02(2006.01) B24D 9/08(2006.01) B24B 23/04(2006.01) (86) International application number: PCT/FI2018/050614 (87) International publication number: WO 2019/048732 (14.03.2019 Gazette 2019/11)

(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: 08.09.2017 FI 20175800 (71) Applicant: Mirka Ltd. 66850 Jepua (FI)	(72) Inventors: FINNÄS, Stig 68690 Sundby (FI) BÄCK, Simon 66600 Vörå (FI) (74) Representative: Berggren Oy, Tampere  Visiokatu 1 33720 Tampere 33720 Tampere (FI)