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(11)

EP 3 538 691 A1

(12)

(43) Date of publication: 18.09.2019 Bulletin 2019/38 (21) Application number: 17829217.3 (22) Date of filing: 14.12.2017

(51) International Patent Classification (IPC):  D01F 1/10(2006.01) D01F 2/00(2006.01) D02G 3/04(2006.01) (86) International application number: PCT/FI2017/050896 (87) International publication number: WO 2018/115577 (28.06.2018 Gazette 2018/26)

(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: MA MD TN (30) Priority: 23.12.2016 FI 20166035 (71) Applicant: Spinnova Oy 40320 Jyväskylä (FI)	(72) Inventors: SALMELA, Juha 41340 Laukaa (FI) PORANEN, Janne 40950 Muurame (FI) SALMINEN, Arto 40420 Jyskä (FI) (74) Representative: Berggren Oy, Tampere  Visiokatu 1 33720 Tampere 33720 Tampere (FI)