US4487011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a texturized profile yarn, and the resulting yarns
Assignee: Hoechst AG
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Filing: 1982-04-12
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Granted: 1984-12-11
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Expires: 2002-04-12
Abstract
Abstract The invention relates to a process for making texturized multifilament yarns having profiled polyester filaments, by means of draw false twist texturizing, wherein feed yarns which are multifilament yarns having a high pre-orientation which corresponds to a birefringence of more than 65×10 -3 are simultaneously drawn and false twist texturized without a reduction of the twist number but at temperatures which are no more than 30° C. above the glass transition temperature (second order transition temperature) of the polymer and to the resulting luster yarns, the cross-section profiles of which are largely retained in this special texturizing process.
Inventors
- 👤 Karl Heinrich
- 👤 Norbert Heichlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:00
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0286
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
In a process for making texturized multifilament yarns with profiled filaments the filament-forming substance of which consists of high-molecular weight polyesters, by means of false twist texturizing, the improvement comprises simultaneously false twist texturizing and drawing without reduction of the twist number feed yarns which are highly pre-oriented multifilament yarns which have a birefringence of more than 65×10 -3 , while heating the yarns at no more than 30° C. above the glass transition temperature of the polymer.
Claim 2
Dependent Claim
78 words
In a process for making texturized multifilament yarns with profiled filaments the filament-forming substance of which consists of high-molecular weight polyesters, by means of false twist texturizing, the improvement comprises simultaneously false twist texturizing and drawing without reduction of the twist number feed yarns which are highly pre-oriented multifilament yarns which have a birefringence of more than 65×10 -3 , while heating the yarns at no more than 30° C. above the glass transition temperature of the polymer.
Claim 3
Dependent Claim
25 words
The process as claimed in claim 1, wherein the simultaneous draw texturizing is carried out at room temperature without the use of a heating device.
Claim 4
Dependent Claim
31 words
The process as claimed in claim 1 or 2, wherein the birefringence of the feed yarns is below 120×10 -3 , preferably within a range of 70 to 90×10 -3 .
Claim 5
Dependent Claim
102 words
A false twist texturized yarn composed of polyester filaments having a triangular profile comprising a profile retention, represented as maximum value of the reflectance curve, of at least 65% of the value of the smooth feed yarn and a heat shrinkage at 200° C. of below 20%, preferably below 10%, said reflectance curve being determined in accordance with the method of Knopp with the aid of a Zeiss GP 2 goniometer on parallel wound profile filaments at an illumination angle of 45°, the intensity of the reflected light being recorded as a function of the angle with respect to the measuring plane.
Claim 6
Dependent Claim
102 words
A false twist texturized yarn composed of polyester filaments having a triangular profile comprising a profile retention, represented as maximum value of the reflectance curve, of at least 65% of the value of the smooth feed yarn and a heat shrinkage at 200° C. of below 20%, preferably below 10%, said reflectance curve being determined in accordance with the method of Knopp with the aid of a Zeiss GP 2 goniometer on parallel wound profile filaments at an illumination angle of 45°, the intensity of the reflected light being recorded as a function of the angle with respect to the measuring plane.
Claim 7
Dependent Claim
31 words
A process as claimed in claim 1, wherein the temperature applied in said heating step is below 160° C., said glass transition temperature being more than 30° C. below 160° C.
Claim 8
Dependent Claim
21 words
A process as claimed in claim 5, wherein the temperature applied during the heating step is no greter than 100° C.
Claim 9
Dependent Claim
26 words
A process as claimed in claim 1, wherein the simultaneous draw texturizing is carried out at an applied temperature ranging from room temperature to 100° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |