(19)

(11)

EP 1 869 231 A1

(12)

(43) Date of publication: 26.12.2007 Bulletin 2007/52 (21) Application number: 06727332.6 (22) Date of filing: 17.03.2006

(51) International Patent Classification (IPC):  D01C 1/00(2006.01) (86) International application number: PCT/IB2006/000614 (87) International publication number: WO 2006/100560 (28.09.2006 Gazette 2006/39)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR Designated Extension States: YU (30) Priority: 21.03.2005 IT BO20050179 (71) Applicant: Gruppo Fibranova S.r.l. 57123 Livorno (IT)	(72) Inventors: TOFANI, Cesare I-56035 Lari (Pisa) (IT) ERRANI, Marco I-40055 Villanova di Castenaso (Bologna) (IT) (74) Representative: Lanzoni, Luciano  Via Goito, 18 40126 Bologna 40126 Bologna (IT)