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(11)

EP 2 935 691 A1

(12)

(43) Date of publication: 28.10.2015 Bulletin 2015/44 (21) Application number: 13861974.7 (22) Date of filing: 13.12.2013

(51) International Patent Classification (IPC):  D21D 1/36(2006.01) B02C 2/00(2006.01) D21B 1/30(2006.01) (86) International application number: PCT/FI2013/051164 (87) International publication number: WO 2014/091084 (19.06.2014 Gazette 2014/25)

(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 (30) Priority: 14.12.2012 FI 20126308 (71) Applicant: Mikkelin Ammattikorkeakoulu OY 50101 Mikkeli (FI)	(72) Inventors: KÄYHKÖ, Jari FI-58200 Kerimäki (FI) SAUKKONEN, Esa FI-53850 Lappeenranta (FI) TURUNEN, Juhani FI-57200 Savonlinna (FI) KURRONEN, Kari FI-53300 Lappeenranta (FI) (74) Representative: Berggren Oy Ab  P.O. Box 16 Antinkatu 3 C 00101 Helsinki 00101 Helsinki (FI)