US 11,898,272 B2
Cellulose filament process
Christoph Schrempf, Bad Schallerbach (AT); Johann Pillichshammer, Frankenmarkt (AT); Andreas Gressenbauer, Schorfling am Attersee (AT); Ernst Reiter, Schorfling am Attersee (AT); and Martin Neunteufel, Lantau Island (CN)
Assigned to Lenzing Aktiengesellschaft, Lenzing (AT)
Appl. No. 17/418,022
Filed by LENZING AKTIENGESELLSCHAFT, Lenzing (AT)
PCT Filed Dec. 20, 2019, PCT No. PCT/EP2019/086554
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/136108, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 18248173 (EP), filed on Dec. 28, 2018.
Prior Publication US 2022/0112627 A1, Apr. 14, 2022
Int. Cl. D01D 5/06 (2006.01); D01D 5/30 (2006.01); D01D 10/02 (2006.01); D01F 2/00 (2006.01)
CPC D01D 5/06 (2013.01) [D01D 5/30 (2013.01); D01D 10/02 (2013.01); D01F 2/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A process for the production of lyocell type cellulose filament yarns from a lyocell spinning solution of cellulose in an aqueous tertiary amine oxide comprising the following steps, wherein the process conditions are adjusted so that relation (1a) is fulfilled:

OG Complex Work Unit Math
wherein L designates the length of the air gap (mm), v designates the production speed m/min), titer designates the titer of the individual filament (dtex) and p designates the length of the individual spinneret piece (mm) employed in the spinneret, and wherein v is 400 m/min or more.