Process for making high-performance polyethylene multifilament yarn
US-2017370681-A1 · Dec 28, 2017 · US
Spinneret, method of heating a spinneret and lyocell process
US12129573B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12129573-B2 |
| Application number | US-201917417848-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 20, 2019 |
| Priority date | Dec 28, 2018 |
| Publication date | Oct 29, 2024 |
| Grant date | Oct 29, 2024 |
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- Title
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Abstract
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A method of producing lyocell filaments employs 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 spinneret is heated and used for spinning cellulosic filaments from a cellulose solution in a solvent. A lyocell process employs the spinneret.
First claim
Opening claim text (preview).
What is claimed is: 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. 2. The method according to claim 1 , wherein the steam heatable spinneret further comprises individual nozzle plates within the nozzle frame. 3. The method according to claim 1 , wherein the top housing and the nozzle frame are heated by steam. 4. The method according to claim 1 , wherein the steam heatable spinneret is further heated by additional heating that is different from heating by steam. 5. The method according to claim 1 , wherein the steam heatable spinneret has an aspect ratio of from 5 to 25. 6. The method according to claim 1 , wherein the top housing or the top housing and the nozzle frame is heated by steam having a temperature ranging from 110 to 130° C. and a pressure ranging from 1.5 to 3.4 bar. 7. The method according to claim 1 , wherein the top housing and the nozzle frame are made of stainless steel. 8. The method according to claim 1 , wherein the steam heatable spinneret further comprises a breaker. 9. The method according to claim 8 , wherein the breaker is steam heatable. 10. The method according to claim 1 , wherein the steam heatable spinneret is a multi-nozzle plate spinneret, wherein the nozzle frame comprises lands which are steam heatable.
Assignees
Inventors
Classifications
Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof · CPC title
from viscose · CPC title
Heat treatment (heating for finishing D02J13/00) · CPC title
Spinnerette packs; Cleaning thereof ({D01D5/0069}, D01D5/24, D01D5/253, D01D5/28 take precedence) · CPC title
- D01D4/02Primary
Spinnerettes (alloys therefor C22C) · CPC title
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- What does patent US12129573B2 cover?
- A method of producing lyocell filaments employs 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 spinneret is heated and used for spinning cellulosic filaments from a cellulose solution in a solvent. A lyocell process employs the spinneret.
- Who is the assignee on this patent?
- Chemiefaser Lenzing Ag
- What technology area does this patent fall under?
- Primary CPC classification D01D4/02. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Oct 29 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).