Abstract The ability to maintain a constant differential between modification ratios of trilobal filaments under cospinning conditions is provided by spinning a filament of lower modification ratio through a spinneret orifice consisting of three radially intersecting tapered slots and a filament of a higher modification ratio through a spinneret orifice configured as three radially intersecting reverse-tapered slots. The orifices configured as three radially reverse-tapered slots provide a high modification ratio with low sensitivity to normal spinning process fluctuations which in combination with orifices having tapered slots for filaments of lower modification ratio facilitate maintenance of a more constant differential in modification ratios between the filaments.
Inventors
👤 Chandrakant Shantilal Shah
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 04:27
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
In a process for cospinning at least two synthetic trilobal filaments from the same polymer melt wherein one filament has a modification ratio no greater than 1.9 and the other filament has a modification ratio greater than 1.9 and the two filaments differ in their modification ratios by at least 0.3, the improvement comprising spinning the filament of lower modification ratio through a spinneret orifice configured as three radially intersecting tapered slots and spinning said other filament through a spinneret orifice configured as three radially intersecting reverse-tapered slots.
Claim 2
Dependent Claim
88 words
In a process for cospinning at least two synthetic trilobal filaments from the same polymer melt wherein one filament has a modification ratio no greater than 1.9 and the other filament has a modification ratio greater than 1.9 and the two filaments differ in their modification ratios by at least 0.3, the improvement comprising spinning the filament of lower modification ratio through a spinneret orifice configured as three radially intersecting tapered slots and spinning said other filament through a spinneret orifice configured as three radially intersecting reverse-tapered slots.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the tapered slots and the reverse-tapered slots have a taper angle of from about 3° to about 15°.
Claim 4
Dependent Claim
34 words
The process of claim 2 wherein the modification ratio of the one filament is from about 1.6 to about 1.9 and the modification ratio of the other filament is from about 2.2 to 2.5.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein the difference in modification ratio between the one filament and the other filament is at least 0.6.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the polymer is poly(hexamethylene adipamide).