US 11,873,580 B2
Process for liquid removal from cellulose filaments yarns or fibers
Johann Pillichshammer, Frankenmarkt (AT); Christoph Schrempf, Bad Schallerbach (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. 17/417,957
Filed by LENZING AKTIENGESELLSCHAFT, Lenzing (AT)
PCT Filed Dec. 20, 2019, PCT No. PCT/EP2019/086559
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/136109, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 18248174 (EP), filed on Dec. 28, 2018.
Prior Publication US 2022/0081803 A1, Mar. 17, 2022
Int. Cl. D01D 10/06 (2006.01); D01D 5/06 (2006.01); D01F 2/02 (2006.01)
CPC D01D 10/06 (2013.01) [D01D 5/06 (2013.01); D01F 2/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A process for the removal of liquid from lyocell type cellulose filament bundles or yarns from a lyocell spinning solution of cellulose in an aqueous tertiary amine oxide, wherein the lyocell type cellulose filament bundles or yarns are guided around a roller under conditions so that equation (1) is fulfilled, with the proviso that a_sp is at least 296 m/s2:
a_sp=r×ω2×titer/40  (1)
with r being the radius of the roller (m), ω being the angular speed (1/ s), and titer (dtex) being the bundle/yarn titer, with the proviso that same is at least 20.