US3708970A
Expired / Lapsed
US
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Yarn process
Assignee: Celanese Corp
•
Filing: 1971-01-29
•
Granted: 1973-01-09
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Expires: 1991-01-29
Abstract
Abstract Textile denier, multifilament, false twist crimped, heat set stabilized polyester yarn characterized by liveliness and filamentation values and a simultaneous draw-texturing process for the production thereof.
Inventors
- 👤 Iain M Macfarlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:27
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
22 words
The yarn of claim 1 wherein the polyester is polyethylene terephthalate and the yarn has a denier of about 145 to 175.
Claim 2
Dependent Claim
38 words
The yarn of claim 2 wherein the yarn tenacity is at least 3.2 grams per denier. linear shrinkage is below about 10 percent, the liveliness factor is 30 to 45 and the filamentation value is 0.1 to 0.3.
Claim 3
Dependent Claim
22 words
The yarn of claim 3 wherein linear shrinkage is below about 5 percent and the liveliness factor is about 30 to 35.
Claim 4
Dependent Claim
21 words
The yarn of claim 2 wherein the torque wrap number is 15 to 30 and the self-twisting tendency is below 1.7.
Claim 5
Dependent Claim
14 words
The yarn of claim 5 wherein the self twisting tendency is 1.3 to 1.6.
Claim 6
Dependent Claim
15 words
The yarn of claim 2 wherein the dynamic cycle stretch test value is above 1.8.
Claim 7
Dependent Claim
16 words
The yarn of claim 2 wherein the dynamic cycle stretch test value is 2.0 to 2.5.
Claim 8
Dependent Claim
132 words
In a process for producing a 145 to 170 denier false twist crimped polyester multifilament yarn, wherein an undrawn or partially undrawn polyester yarn is fed into a simultaneous drawing and false twist crimping zone consisting of a heater and false twister positioned between a feed means and draw means and wherein the false twist backs upstream into the heated zone wherein the false twist is set into the yarn and wherein the yarn necks at a draw point without the presence of snubbing means, the improvements which comprise inserting about 60 to 80 turns per inch of false twist into the yarn while drawing the yarn about 3.40 to 3.55 times to produce a yarn having a tenacity of at least 3.0 gpd and an elongation of at least 20 percent.
Claim 9
Dependent Claim
41 words
The process of claim 9, wherein the yarn tension on the yarn along the longitudinal axis thereof is about 0.118 to 0.180 grams per denier above the false twister and about 0.236 to 0.420 grams per denier below the false twister.
Claim 10
Dependent Claim
20 words
The process of claim 9 wherein 68 to 75 turns per inch of false twist is inserted into the yarn.
Claim 11
Dependent Claim
18 words
The yarn of claim 3 wherein the crimps per extended inch of filament is about 35 to 45.
Claim 12
Dependent Claim
9 words
A knit fabric comprising the yarn of claim 1.
Claim 13
Dependent Claim
9 words
A knit fabric comprising the yarn of claim 12.
Claim 14
Dependent Claim
21 words
The yarn of claim 2, made by being false twist crimped and drawn in a simultaneous false twist crimp-draw process step.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |