System and method of dosing a polymer mixture with a first solvent, device, system and method of extracting solvent from at least one polymeric yarn, system and method of mechanical pre-recovery of at least one liquid in at least one polymeric yarn, and continuous system and method for producing at least one polymeric yarn

Patent metadata

Field	Value
Publication number	US-11976385-B2
Application number	US-202016824978-A
Country	US
Kind code	B2
Filing date	Mar 20, 2020
Priority date	Oct 29, 2013
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

The present invention is directed to a method and a system for the production of at least one polymeric yarn comprising means for mixing a polymer ( 1 ) with a first solvent yielding a mixture; means for homogenizing the mixture; means for rendering the mixture inert ( 21, 22, 23 ); means for dipping the mixture into a quenching bath ( 30 ), wherein an air gap is maintained before the mixture reaches the quenching bath ( 30 ) liquid surface forming at least one polymeric yarn; means for drawing ( 41 ) the at least one polymeric yarn at least once; means for washing ( 5 ) the at least one polymeric yarn with a second solvent that is more volatile than the first solvent; means for heating the at least one polymeric yarn ( 6 ); means for drawing at room temperature ( 7 ) the at least one polymeric yarn at least once; and means for heat drawing ( 8 ) the at least one polymeric yarn at least once.
The instant invention also concerns a system and method of dosing a polymer mixture with a first solvent into an extruder ( 26 ), a device ( 5 ), a system and a method of solvent extraction from at least one polymeric yarn, and a method and system of mechanical pre-recovery ( 4 ) of at least one liquid in at least one polymeric yarn.

First claim

What is claimed is:

1. A method of mechanical pre-recovery of at least one liquid from a polymeric yarn, comprising:
receiving a polymeric yarn from a quenching bath, the polymeric yarn being in the form of a gel yarn comprising a polymer and a solvent;
drawing the polymeric yarn into a drawing tank comprising a heated liquid medium, such that the polymeric yarn is stretched and immersed in the heated liquid medium for a residence time to exude a volumetric fraction of the solvent to a surface of the polymeric yarn;
drawing the polymeric yarn into a first pre-recovery enclosure and mechanically retaining a free volumetric fraction of at least one liquid from the surface of the polymeric yarn in the first pre-recovery enclosure while the polymeric yarn still comprises a stable volumetric fraction of liquid therein;
accumulating the polymeric yarn with the stable volumetric fraction on accumulator rolls for a residence time sufficient for at least a portion of the stable volumetric fraction to exude onto the surface of the polymeric yarn as a free volumetric fraction; and
drawing the polymeric yarn into a second pre-recovery enclosure and mechanically retaining the exuded free volumetric fraction from the surface of the polymeric yarn in the second pre-recovery enclosure.

2. The pre-recovery method of claim 1 , wherein mechanically retaining a free volumetric fraction of at least one liquid from the surface of the polymeric yarn surface in the first pre-recovery enclosure or the exuded free volumetric fraction in the second pre-recovery enclosure comprises at least one of generating an air flow against the surface of the at least one gel yarn, and tangentially scraping the liquid from a feed roll tower surface having an air blade.

3. A system of mechanical pre-recovery of at least one liquid from a polymeric yarn, comprising:
means for receiving a polymeric yarn from a quenching bath, the polymeric yarn being in the form of a gel yarn comprising a polymer and a solvent;
means for drawing, in a drawing device, the polymeric yarn into a drawing tank comprising a heated liquid medium, such that the polymeric yarn is stretched and immersed in the heated liquid medium for a residence time to exude a volumetric fraction of the solvent to a surface of the polymeric yarn;
means for mechanically retaining a free volumetric fraction of at least one liquid from the surface of the polymeric yarn in a first pre-recovery enclosure, while the polymeric yarn still comprises a stable volumetric fraction of liquid therein;
means for accumulating, in an accumulator device, the polymeric yarn with the stable volumetric fraction ion accumulator rolls for a residence time sufficient for at least a portion of the stable volumetric fraction to exude onto the surface of the polymeric yarn as a free volumetric fraction; and
means for mechanically retaining the exuded free volumetric fraction from the surface of the polymeric yarn in a second pre-recovery enclosure.

4. The pre-recovery system of claim 3 , further comprising means for mechanically retaining at least one liquid of the polymeric yarn surface in the first pre-recovery enclosure or the second pre-recovery enclosure comprising at least one of:
at least one air flow generator against the surface of the at least one gel yarn; and
at least one scraper device designed to tangentially scrape the liquid from a feed roll tower surface having an air blade.

5. The pre-recovery system of claim 4 , wherein the feed roll tower device comprises at least one roll and, positioned below them, a liquid collection device.

6. The pre-recovery system of claim 3 , wherein the first or the second pre-recovery enclosure comprises an insulating housing designed to absorb noise and designed to retain liquid particles.

7. The pre-recovery method of claim 1 , wherein the residence time on the accumulator rolls is greater than 0.5 minutes.

8. The pre-recovery method of claim 7 , wherein the residence time on the accumulator rolls is greater than 1 minute.

9. The pre-recovery method of claim 7 , wherein the residence time on the accumulator rolls is greater than 2 minutes.

10. The pre-recovery method of claim 1 , wherein the quenching bath comprises water.

11. The pre-recovery method of claim 1 , wherein the heated liquid medium comprises water.

12. The pre-recovery method of claim 1 , wherein the heated liquid medium comprises the solvent.

Assignees

• Braskem America Inc

Inventors

• Bueno Marcos Roberto Paulino
• Penaquioni Andre
• Bernardi Alessandro
• Almeida Sergio Luiz Dias
• Santa Rosa Leandro Ohara Oliveira
• Fialho Patricia Freitas Oliveira
• Rauber Daniela Zaira

Classifications

• D01D1/02 Primary

  Preparation of spinning solutions · CPC title

• B29B7/007

  for continuous mixing · CPC title

• B29B7/46

  with more than one shaft · CPC title

• B29B7/726

  Measuring properties of mixture, e.g. temperature or density (B29B7/724 takes precedence) · CPC title

• B29B7/749

  with stirring means for the individual components before they are mixed together · CPC title