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US 2003/0118763 A1Published application
Method and apparatus for high denier hollow spiral fiber
AssigneeWellman, Inc.
InventorsFrederick L. Travelute, Evan T. Basalik
Life of this patent
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AssigneeWellman, Inc.
InventorsFrederick L. Travelute, Evan T. Basalik
Estimating the term…
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.
A spinneret for the production of hollow filament comprising:
A spinneret for the production of hollow filament comprising:
A spinneret for the production of a hollow filament comprising:
A spinneret comprising:
A method of producing generally cylindrical hollow filaments comprising extruding a polymer melt through a spinneret comprising first and second non-linear slots where each slot has a first end having a first width and a second end having a second width and changing the velocity of the melt extruded through a slot along the continuum defined by the distance between the first end and the second end.
The method of 31 wherein the step of raising the temperature of the hollow filaments to a temperature sufficient for the filaments to relax comprises raising the temperature to between about 35° C. to about 60° C.
The method for producing hollow filaments comprising:
A method of producing generally cylindrical hollow filaments comprising:
A method of extruding polymer melt to form a generally non-linear section of a polymer melt, the method comprising extruding a polymer melt while creating a velocity gradient along a distance defining the greater portion of the non-linear section.
A hollow polymer filament having a generally cylindrical cross-section, said filament further defined by a cylindrical wall formed of at least two generally c-shaped sections, each section comprising first and second ends separated by an intermediate portion in which no two points along the cross-section of the wall corresponding to said intermediate portion share the same width.
A hollow polymer 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.
The method of claim 90 further comprising weaving the staple fiber into a woven fabric.
The method of claim 94 further comprising weaving the staple fiber into a woven fabric.
The method of claim 98 further comprising weaving the staple fiber into a woven fabric.
The method of claim 102 further comprising weaving the staple fiber into a woven fabric.
A polyester yarn formed from staple fibers according to claim 106.
A fabric comprising polyester yarn according to claim 107.
A woven fabric according to claim 108.
A polyester yarn formed from staple fibers according to claim 112.
A fabric comprising polyester yarn according to claim 113.
A woven fabric according to claim 114.
A coiled bilateral hollow polymeric filament in which the two component polymers are identical except for their degree of orientation wherein said filament is defined by a non-linear wall formed of at least two non-linear sections.
The filament of claim 118 wherein said non-linear wall is cylindrical and said two non-linear sections are C-shaped.
Dependencies are inferred from the claim text.