IP Library › Granted Patent US 7,001,664
Granted Patent B2
US 7,001,664 · App. 10/951,018 · Granted Feb 21, 2006

Method and apparatus for high denier hollow spiral fiber

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Quick Facts
Patent No.
US 7,001,664
App. No.
10/951,018
Granted
Feb 21, 2006
Kind
B2
Abstract

An apparatus and method for producing self-texturing hollow fiber that exhibits a desirable tendency to coil rather than to bend sharply or zig-zag. In one embodiment the invention is a spinneret for the production of hollow filament having first and second curved slots where each slot is defined by a first end having a first width and a second end having a second width and where the first and second ends are separated by an intermediate portion possessing a non-uniform width. In another embodiment the invention is a method for of producing generally cylindrical hollow filaments comprising extruding a polymer melt through a spinneret having first and second curved slots where each slot has a first end having a first width and a second end having a second width and where the first and second ends are separated by a intermediate portion possessing a non-uniform width along the continuum defined by the distance between the first end and the second end.

Claims (14)

1. A hollow polyester filament having a generally cylindrical cross-section, said filament comprising a cylindrical wall in which the thickness of the wall graduates along its entire circumference and in which one side of the hollow filament is more oriented than the other.

2. A hollow polymer filament according to claim 1 wherein the filament is coiled.

3. A cut staple fiber formed from the polyester filament of claim 1 .

4. A polyester yarn formed from staple fibers according to claim 3 .

5. A fabric comprising polyester yarn according to claim 4 .

6. A woven fabric according to claim 5 .

7. A knitted fabric according to claim 5 .

8. A non-woven fabric comprising the filament of claim 1 .

9. A cut staple fiber formed from the polyester filament of claim 1 .

10. A polyester yarn formed from staple fibers according to claim 9 .

11. A fabric comprising polyester yarn according to claim 10 .

12. A woven fabric according to claim 11 .

13. A knitted fabric according to claim 11 .

14. A non-woven fabric comprising the filament of claim 1 .