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US4332761A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for manufacture of textile filaments and yarns

Assignee: Eastman Chemical Co
•
Filing: 1980-10-02
•
Granted: 1982-06-01
•
Expires: 2000-10-02
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Abstract

Abstract Multifilament yarns comprising continuous multifilaments each having at least one body section and having extending therefrom along its length at least one wing member, the body section comprising about 25 to about 95% of the total mass of the filament and the wing member comprising about 5 to about 75% of the total mass of filament, the filament being further characterized by a wing-body interaction defined by ##EQU1## where the ratio of the width of said fiber to the wing thickness (L T /Dmin) is ≦30. Also disclosed are specific yarns and processes for producing the filaments and yarns. The spun-like character of the fractured yarns of this invention is provided by the wing members extending from and along the body section being intermittently separated from the body section and a fraction of the separated wing members being broken to provide free protruding ends extending from the body section.

Inventors

  • 👤 Bobby M. Phillips
  • 👤 James O. Casey, Jr.
  • 👤 Dale R. Gregory

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 19:31
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/253

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 148 words
Process for draw-fracturing textile yarn, said process comprising uniformly drawing to a preselected level of textile utility a yarn comprising filaments having a wing-body interaction defined by ##EQU25## where the ratio of the width of said filament to the width of said wing (L T /Dmin) is ≦30, Dmax is the thickness or diameter of the body of the cross-section, Dmin is the thickness of the wing for essentially uniform wings and the minimum thickness close to the body when the thickness of the wing is variable, R c is the radius of curvature of the intersection of the wing and body, Lw is the overall length of an individual wing and L T is the overall length of the cross section, stabilizing said yarn to a specific gravity of at least 1.35; fracturing the wing portion of said filament utilizing fracturing means, and taking up said yarn.
Claim 2
Dependent Claim 148 words
Process for draw-fracturing textile yarn, said process comprising uniformly drawing to a preselected level of textile utility a yarn comprising filaments having a wing-body interaction defined by ##EQU25## where the ratio of the width of said filament to the width of said wing (L T /Dmin) is ≦30, Dmax is the thickness or diameter of the body of the cross-section, Dmin is the thickness of the wing for essentially uniform wings and the minimum thickness close to the body when the thickness of the wing is variable, R c is the radius of curvature of the intersection of the wing and body, Lw is the overall length of an individual wing and L T is the overall length of the cross section, stabilizing said yarn to a specific gravity of at least 1.35; fracturing the wing portion of said filament utilizing fracturing means, and taking up said yarn.
Claim 3
Dependent Claim 27 words
Process of claim 1 wherein said fracturing means comprises a fluid fracturing jet operating at a brittleness parameter (Bp*) of about 0.03-0.8 for the yarn being fractured.
Claim 4
Dependent Claim 12 words
Process of claim 2 wherein said yarn is a poly(ethylene terephthalate) yarn.
Claim 5
Dependent Claim 26 words
Process of claim 2 wherein said yarn is a poly(ethylene terephthalate) yarn and said fracturing means is operated at a brittleness parameter (Bp*) of about 0.03-0.6.
Claim 6
Dependent Claim 21 words
Process of claim 4 wherein said fracturing means is operated at a brittleness parameter (Bp*) of about 0.03 to about 0.4.
Claim 7
Dependent Claim 27 words
Process of claim 2 wherein the specific volume of the fractured yarn is made to vary along the yarn strand by varying the fracturing jet air pressure.

References Cited (Backward Citations)

DE741739C Cited
US2816349A Cited
US3078544A Cited
US3135646A Cited
US3273771A Cited
US3219739A Cited
US3470685A Cited
JPS4936057A Cited
US3914488A Cited
JPS5095513A Cited
US4245001A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1985-05-31 1985-11-30 1986-06-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1989-05-31 1989-11-30 1990-06-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1993-05-31 1993-11-30 1994-06-01 $7700.00 Window Closed / Lapsed

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