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(11)

EP 4 048 831 A1

(12)

(43) Date of publication: 31.08.2022 Bulletin 2022/35 (21) Application number: 20792988.6 (22) Date of filing: 21.10.2020

(51) International Patent Classification (IPC):  D01F 2/00(2006.01) D01D 7/00(2006.01) D01D 13/02(2006.01) (52) Cooperative Patent Classification (CPC): D01F 2/00; D01D 13/02; D01D 7/00 (86) International application number: PCT/EP2020/079560 (87) International publication number: WO 2021/078768 (29.04.2021 Gazette 2021/17)

(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: 23.10.2019 EP 19204806 (71) Applicant: LENZING AKTIENGESELLSCHAFT 4860 Lenzing (AT)	(72) Inventors: PILLICHSHAMMER, Johann 4890 Frankenmarkt (AT) SCHREMPF, Christoph 4701 Bad Schallerbach (AT) GRESSENBAUER, Andreas 4861 Schörfling am Attersee (AT) REITER, Ernst 4861 Schörfling am Attersee (AT) NEUNTEUFEL, Martin Bayside Lantau Island (CN) (74) Representative: Grünecker Patent- und Rechtsanwälte PartG mbB  Leopoldstraße 4 80802 München 80802 München (DE)