System and method for measuring out a polymer and first solvent mixture, device, system and method for extracting a solvent from at least one polymer strand, system and method for mechanically pre-recovering at least one liquid from at least one polymer strand, and a continuous system and method for the production of at least one polymer strand

Patent metadata

Field	Value
Publication number	US-2016281265-A1
Application number	US-201415032826-A
Country	US
Kind code	A1
Filing date	Oct 29, 2014
Priority date	Oct 29, 2013
Publication date	Sep 29, 2016
Grant date	—

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 system for dosing a polymer mixture with a first solvent in an extruder comprising at least two inertization devices comprising means for introducing an inertization gas flow, wherein the at least two inertization devices feed the extruder with the inertized mixture, the system being characterized by further comprising a feeding control device adapted to control the mixture level above the screw of said extruder, such that rotation is sufficient not to segregate phases in the mixture.

2 . The dosing system of claim 1 , characterized by comprising a dosing device, designed to accumulate part of the mixture from at least one inertization device before feeding the extruder.

3 . The dosing system of claim 2 , characterized in that the dosing device comprises at least one of: a mixture level sensor; means for introducing an inertization gas flow; and means for entering the mixture, wherein the feed control device is a dosing valve adapted to enable and interrupting feeding in case of dosage ( 25 ).

4 . The dosing system of claim 1 , characterized in that the at least one inertization device comprises at least one of: a mechanical stirrer; a mixture pumping circuit; an oxygen metering device; a level sensor adapted to measure the level of the mixture inside it; and a mixture inlet control valve, wherein in the start and stop steps of the extruder, at least one of the at least two inertization devices feeds the extruder with a more diluted polymer mixture, wherein the more diluted mixture comprises a mass concentration lower than the mass concentration of the mixture used after the start step and prior to the stop step.

5 . A dosing method of a mixture with a first solvent in an extruder comprising the steps of inertizing the mixture with an inertization gas flow in an inertization device and feeding the extruder with the inertized mixture, the method being characterized by further comprising controlling the level of the mixture above the extruder screw.

6 . The dosing method of claim 5 , characterized by comprising the steps of:
accumulating part of the mixture from at least one inertization device in a dosing device, prior to feeding the extruder with the mixture; and in the start and stop steps of the extruder, feeding the extruder with a more diluted polymer mixture, wherein the more diluted mixture comprises a mass concentration lower than the mass concentration of the mixture used after the start step and prior to the stop step.

7 . A device for extracting solvent from at least one polymeric yarn comprising a first solvent characterized by comprising:
a rotating member comprising a structure having hollows in which the at least one polymeric yarn is externally wound at least once; at least two extraction liquid delivery devices, wherein at least one of the at least two washing liquid delivery devices is designed to deliver the washing liquid to the at least one polymeric yarn externally to the rotating member, and at least one of the at least two washing liquid delivery devices is designed for delivering the washing liquid in at least one polymeric yarn internally to the rotating member.

8 . The extraction device of claim 7 , characterized by comprising at least one of:
an auxiliary member positioned longitudinally in parallel to the structure having hollows, between the at least one yarn and an external portion of the rotating member, wherein the auxiliary member is designed to bring close to and move away from the rotating member at least one portion of the at least one polymeric yarn; a pressurizable protective wrap isolating the extraction device from the external environment, wherein the wrap comprises a yarn inlet opening and a yarn outlet opening, wherein the inlet and outlet openings each comprise a sealing device, a liquid collecting vessel positioned at the lower portion of the protective wrap, and a liquid recirculating device designed to recirculate the liquid collected by the collecting vessel to the at least two washing liquid delivery devices; a rotation motor designed to rotate the rotating member; a plurality of washing liquid delivery devices designed to deliver the washing liquid to the at least one polymeric yarn both internally and externally to the rotating member; a pumping device designed to direct the liquid collected by a liquid collecting vessel to the at least two washing liquid delivery devices; a heat exchanger device designed to perform one of heating and cooling the washing liquid; and at least one auxiliary positioning device of the at least one yarn adapted to the rotating member.

9 . The extraction device of claim 7 , characterized in that
the rotating member has a drum shape, wherein the surface having hollows comprises shafts, the auxiliary member is a roll designed to rotate freely around its rotating axis, a plurality of washing liquid delivery devices external to the rotating member are attached to at least one of: a circular structure external to the rotating member; and the protective wrap, and the plurality of washing liquid delivery devices internal to the rotating member are attached to a circular element internal to the rotating member.

10 . A system for extracting solvent from at least one polymeric yarn comprising a first solvent characterized by comprising at least two extraction devices as defined in claim 7 .

11 . The extraction system of claim 10 , characterized by comprising means for redirecting the washing liquid collected by the liquid collecting vessel from each of the at least two extraction devices to the previous extraction device, wherein the washing liquid is introduced into the system by the last extraction device, and wherein the first extraction device comprises means for discarding the washing liquid collected by the liquid collecting vessel.

12 . The extraction system of claim 10 , characterized by comprising inert gas feeding means and circulation means in at least one of the extraction devices.

13 . A method for extracting solvent from at least one polymeric yarn comprising a first solvent in at least two extraction devices as defined in claim 7 , characterized by comprising the steps of:
winding the at least one polymeric yarn in a rotating member comprising a structure having hollows; and delivering a washing liquid to the at least one polymeric yarn both internally and externally to the rotating member.

14 . The extraction method of claim 13 , characterized in that it further comprises at least one of bringing close to and moving away from the rotating member at least one portion of the at least one polymeric yarn;
feeding the at least one extraction device with an inert gas; redirecting the washing liquid collected by the liquid collecting vessel from each of the at least two extraction devices to the previous extraction device, wherein the washing liquid is introduced into the system by the last extraction device, and wherein the first extraction device comprises means for discarding the washing liquid collected by the liquid collecting vessel.

15 . A method of mechanical pre-recovery of at least one liquid in at least one polymeric yarn, wherein the at least one liquid comprises at least one of a solvent and water, characterized by comprising the steps of:
receiving a polymeric yarn from a quenching bath and mechanically retaining at least one liquid of the polymeric yarn surface in a first pre-recovery enclosure.

16 . The pre-recovery method; of claim 15 , characterized by comprising drawing the at least one polymeric yarn in a drawing tank comprising a

Assignees

• Braskem Sa

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

• D07B2501/2061

  Ship moorings · CPC title

• D01D1/06

  Feeding liquid to the spinning head (constructions of pumps F04) · CPC title

• D01D1/02 Primary

  Preparation of spinning solutions · CPC title

• D01D10/06

  Washing or drying · CPC title

• D07B1/025

  comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers · CPC title