US 11,976,385 B2 · 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

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.

Claims12

Dependent claims

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.

3 more elements

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.

3 more elements

Dependencies are inferred from the claim text.

Life of this patent

Life of this patent

Abstract

Claims12