US 12,129,573 B2
Spinneret, method of heating a spinneret and lyocell 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, N.T. (CN)
Assigned to Lenzing Aktiengesellschaft, Lenzing (AT)
Appl. No. 17/417,848
Filed by LENZING AKTIENGESELLSCHAFT, Lenzing (AT)
PCT Filed Dec. 20, 2019, PCT No. PCT/EP2019/086705
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/136118, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 18248182 (EP), filed on Dec. 28, 2018.
Prior Publication US 2022/0074074 A1, Mar. 10, 2022
Int. Cl. D01D 4/02 (2006.01); D01D 10/02 (2006.01); D01F 2/00 (2006.01); D01F 2/06 (2006.01)
CPC D01D 4/02 (2013.01) [D01D 10/02 (2013.01); D01F 2/06 (2013.01); D01F 2/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of producing lyocell filaments; employing a steam heatable spinneret having a rectangular shape with an aspect ratio of more than 2 and comprising at least a top housing and a nozzle frame, the method comprising:
preparing a spinning solution and extruding the spinning solution with the steam heatable spinneret,
wherein the top housing or the top housing and the nozzle frame is heated by steam having a temperature ranging from 105 to 138° C. and a pressure ranging from 1.2 to 4 bar.