Cellulose filament process
US-2020332442-A1 · Oct 22, 2020 · US
Cellulose filament process
US11898272B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11898272-B2 |
| Application number | US-201917418022-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 20, 2019 |
| Priority date | Dec 28, 2018 |
| Publication date | Feb 13, 2024 |
| Grant date | Feb 13, 2024 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
The present invention provides a process for the viable production of lyocell cellulose continuous filament yarns at very high production speeds.
First claim
Opening claim text (preview).
What is claimed is: 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. 2. 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. 3. The process according to claim 1 , wherein a multifilament yarn is produced. 4. The process according to claim 1 , wherein v is from 400 to 2000 m/min. 5. The process according to claim 1 , wherein the titer of the individual filaments is from 1.0 to 6.0 dtex. 6. The process according to claim 1 , wherein L is at most 150 mm. 7. The process according to claim 1 , wherein p is from 40 to 80 mm. 8. 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. 9. The process according to claim 1 , wherein L is from 90 to 150 mm. 10. The process according to claim 1 , wherein the temperature variability through the extrusion nozzles is controlled to ±2° C. or less.
Assignees
Inventors
Classifications
- D01D5/06Primary
Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title
Conjugate filaments; Spinnerette packs therefor · CPC title
Heat treatment (heating for finishing D02J13/00) · CPC title
- D01F2/00Primary
Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof · CPC title
Spinnerettes (alloys therefor C22C) · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11898272B2 cover?
- The present invention provides a process for the viable production of lyocell cellulose continuous filament yarns at very high production speeds.
- Who is the assignee on this patent?
- Chemiefaser Lenzing Ag
- What technology area does this patent fall under?
- Primary CPC classification D01D5/06. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Feb 13 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).