Process of making tri-arc filaments
AssigneeCelanese Acetate LLC
InventorsChristopher M. Bundren, Lawton E. Kizer, Denis G. Fallon, Lixin Xue
Life of this patent
Estimating the term…
Abstract
A spinneret having tri-arc holes may be used to produce tri-arc filaments. In some instances, tri-arc holes have a Y-shape with three prongs and each prong having an arc at the end of the prong that tapers from the end of the arc to a connection point of an adjacent arc, and tri-arc filaments have a generally-Y shape cross-section with bulbous or arcing tips. Further, tri-arc filaments may be useful in a plurality of applications including, but not limited to, filters, filters comprising particulate additives, and smoking device filters.
Claims19
A method comprising:
- providing a dope comprising a polymer and a solvent;
- passing the dope through a spinneret having a plurality of tri-arc holes that are a Y-shape with three prongs and each prong having an arc at an end of the prong that tapers from the end of the arc to a connection point of an adjacent arc;
- and
- spinning a plurality of tri-arc filaments having a generally Y-shape cross-section having bulbous or arcing tips.
A method comprising:
- heating a dope comprising a polymer and a solvent to about 40° C. to about 100° C.;
- passing the dope through a spinneret having a plurality of tri-arc holes that are a Y-shape with three prongs and each prong having an arc at an end of the prong that tapers from the end of the arc to a connection point of an adjacent arc;
- spinning a plurality of tri-arc filaments having a generally Y-shape cross-section having bulbous or arcing tips, wherein the tri-arc filaments have a denier per filament of about 1 dpf to about 30 dpf;
- and
- producing a tow band comprising at least some of the tri-arc filaments.
A method comprising:
- providing a dope comprising a cellulose acetate and a solvent, wherein the cellulose acetate is present in the dope at about 20% to about 40% by weight of the dope;
- passing the dope through a spinneret having a plurality of tri-arc holes that are a Y-shape with three prongs and each prong having an arc at an end of the prong that tapers from the end of the arc to a connection point of an adjacent arc;
- and
- spinning a plurality of tri-arc filaments having a generally Y-shape cross-section having bulbous or arcing tips, wherein the tri-arc filaments have a denier per filament of about 10 dpf to about 30 dpf.
Dependencies are inferred from the claim text.