Composite nonwoven and process for producing a composite nonwoven
US-2023083348-A1 · Mar 16, 2023 · US
Process for liquid removal from cellulose filaments yarns or fibers
US11873580B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11873580-B2 |
| Application number | US-201917417957-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 20, 2019 |
| Priority date | Dec 28, 2018 |
| Publication date | Jan 16, 2024 |
| Grant date | Jan 16, 2024 |
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- Title
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- Abstract
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Abstract
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The present invention provides a process for the viable removal of liquid from lyocell cellulose continuous filament yarns at very high production speeds.
First claim
Opening claim text (preview).
The invention claimed is: 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/s 2 : a _ sp=r×ω 2 ×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. 2. The process according to claim 1 , wherein r is from 0.010 to 0.200 m. 3. The process according to claim 1 , wherein the titer is from 20 to 400 dtex. 4. The process according to claim 1 , wherein the roller is a driven roller. 5. The process according to claim 1 , wherein the roller is driven by the filament movement. 6. The process according to claim 1 , wherein the lyocell type cellulose filament bundles or yarns are in contact with at least 12.5% of the circumferential surface of the roller (45°). 7. The process according to claim 1 , wherein two or more rollers for liquid removal are provided without intermittent steps of contacting the lyocell type cellulose filament bundles or yarns with fresh washing liquid. 8. The process according to claim 1 , wherein two or more rollers for liquid removal are provided with intermittent steps of contacting the lyocell type cellulose filament bundles or yarns with fresh washing liquid. 9. The process according to claim 1 , wherein the filament tension during the removal of liquid is 2 cN per filament or more. 10. The process according to claim 1 , wherein the filament tension during the removal of liquid is 0.4 cN/dtex or less. 11. The process according to claim 2 , wherein r is from 0.0125 to 0.150 m. 12. The process according to claim 6 , wherein the lyocell type cellulose filament bundles or yarns are in contact with at least 25% of the circumferential surface of the roller(90°).
Assignees
Inventors
Classifications
- D01D10/06Primary
Washing or drying · CPC title
- D01D5/06Primary
Wet spinning methods {(D01D5/0046 takes precedence)} · CPC title
from solutions of cellulose in acids, bases or salts · CPC title
- D01F2/00Primary
Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof · CPC title
- D01D5/0069Primary
characterised by the spinning section, e.g. capillary tube, protrusion or pin · CPC title
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Frequently asked questions
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- What does patent US11873580B2 cover?
- The present invention provides a process for the viable removal of liquid from 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 D01D10/06. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Jan 16 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).