# US 11,898,272 B2 · Cellulose filament process

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- Number: US 11,898,272 B2
- Document ID: US11898272B2
- Status: Granted
- Kind: B2
- Application number: 17/418,022
- Filed: 2019-12-20
- Published: 2022-04-14
- Granted: 2024-02-13
- Earliest claimed: 2018-12-28
- Assignees: Lenzing Aktiengesellschaft
- Applicants: Lenzing Aktiengesellschaft
- Inventors: Christoph Schrempf; Johann Pillichshammer; Andreas Gressenbauer; Ernst Reiter; Martin Neunteufel
- Web page: https://patentgrep.com/patent/US11898272B2

## CPC

- D01D 5/06: Wet spinning methods {(D01D5/0046 takes precedence)}
- D01D 4/02: Spinnerettes (alloys therefor C22C)
- D01D 5/0069: {characterised by the spinning section, e.g. capillary tube, protrusion or pin}
- D01D 5/30: Conjugate filaments; Spinnerette packs therefor
- D01D 10/02: Heat treatment (heating for finishing D02J13/00)
- D01F 2/00: Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
- D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS

## Abstract

The present invention provides a process for the viable production of lyocell cellulose continuous filament yarns at very high production speeds.

## Claims

### Claim 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:
L
>
v
1000
×
1.7
⁢
/
⁢
titer
×
p
(
1
⁢
a
)
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.

### Claim 2 (depends on 1)

The process according to claim 1, wherein the process conditions are adjusted so that relation (1b) is fulfilled:
L
>
F
×
v
1000
×
1.7
⁢
/
⁢
titer
×
p
(
1
⁢
b
)
with F being 1.3 or more.

### Claim 3 (depends on 1)

The process according to claim 1, wherein a multifilament yarn is produced.

### Claim 4 (depends on 1)

The process according to claim 1, wherein v is from 400 to 2000 m/min.

### Claim 5 (depends on 1)

The process according to claim 1, wherein the titer of the individual filaments is from 1.0 to 6.0 dtex.

### Claim 6 (depends on 1)

The process according to claim 1, wherein L is at most 150 mm.

### Claim 7 (depends on 1)

The process according to claim 1, wherein p is from 40 to 80 mm.

### Claim 8 (depends on 1)

The process according to claim 1, wherein the filaments are further solidified in a coagulation bath having a depth of from 5 to 50 mm.

### Claim 9 (depends on 1)

The process according to claim 1, wherein L is from 90 to 150 mm.

### Claim 10 (depends on 1)

The process according to claim 1, wherein the temperature variability through the extrusion nozzles is controlled to ±2° C. or less.