US3886722A
Expired / Lapsed
US
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Process for producing polyester textured yarn
Assignee: Teijin Ltd
•
Filing: 1973-08-13
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Granted: 1975-06-03
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Expires: 1993-08-13
Abstract
Abstract A process for producing a polyester textured yarn which comprises drawing and simultaneously false-twisting an undrawn polyester yarn using a draw texturing apparatus equipped with a heat-treating heater and a false twister between feed rollers and draw rollers, wherein the undrawn polyester yarn has a birefringence ( Delta n) of 0.01 to 0.05, and the draw ratio (DR) is adjusted to a value expressed by the following equations according to the birefringence of the undrawn polyester yarn -1.8349 LOG Delta N-1.1376 < OR = DR < OR = -2.1789 log Delta n-1.3509 AND DR < OR = 2.8.
Inventors
- 👤 Kikuo Hori
- 👤 Hidehiko Okada
- 👤 Masakazu Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:06
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D02G; D02G1/00; D02G1/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
102 words
A process for producing a polyester textured yarn which comprises drawing and simultaneously false-twisting an undrawn polyester yarn using a draw texturing apparatus equipped with a hEat-treating heater and a false twister between feed rollers and draw rollers, wherein the undrawn polyester yarn has a birefringence ( Delta n) of 0.01 to 0.05, and the draw ratio (DR) is adjusted to a value expressed by the following equations according to the birefringence of the undrawn polyester yarn -1.8349 log Delta n - 1.1376 < or = DR < or = -2.1789 log Delta n - 1.3509 and DR < or = 2.8.
Claim 2
Dependent Claim
102 words
A process for producing a polyester textured yarn which comprises drawing and simultaneously false-twisting an undrawn polyester yarn using a draw texturing apparatus equipped with a hEat-treating heater and a false twister between feed rollers and draw rollers, wherein the undrawn polyester yarn has a birefringence ( Delta n) of 0.01 to 0.05, and the draw ratio (DR) is adjusted to a value expressed by the following equations according to the birefringence of the undrawn polyester yarn -1.8349 log Delta n - 1.1376 < or = DR < or = -2.1789 log Delta n - 1.3509 and DR < or = 2.8.
Claim 3
Dependent Claim
75 words
A PROCESS FOR PRODUCING A POLYESTER TEXTURED YARN WHICH COMPRISES DRAWING AND SIMULTANEOUSLY FASTE-TWISTING AN UNDRAW POLYESTER YARN USING A DRAW TEXTURING APPARATUS EQUIPPED WITH A HEAT-TREATING HEATER AND A FALSE TWISTER BETWEEN FEED ROLLERS AND DRAW ROLLERS, WHEREIN THE UNDRAWN POLYESTER YARN HAS A BIREFRINGENCE ($N) OF 0.01 TO 0.05, AND THE DRAW RATIO (DR) IS ADJUSTED TO A VALUE EXPRESSED BY THE FOLLOWING EQUATIONS ACCORDING TO THE BIREFRINGENCE OF THE UNDRAWN POLYESTER YARN
Claim 4
Dependent Claim
75 words
A PROCESS FOR PRODUCING A POLYESTER TEXTURED YARN WHICH COMPRISES DRAWING AND SIMULTANEOUSLY FASTE-TWISTING AN UNDRAW POLYESTER YARN USING A DRAW TEXTURING APPARATUS EQUIPPED WITH A HEAT-TREATING HEATER AND A FALSE TWISTER BETWEEN FEED ROLLERS AND DRAW ROLLERS, WHEREIN THE UNDRAWN POLYESTER YARN HAS A BIREFRINGENCE ($N) OF 0.01 TO 0.05, AND THE DRAW RATIO (DR) IS ADJUSTED TO A VALUE EXPRESSED BY THE FOLLOWING EQUATIONS ACCORDING TO THE BIREFRINGENCE OF THE UNDRAWN POLYESTER YARN
Claim 5
Dependent Claim
12 words
8349 LOG $N - 1.1376 $ DR $ -2.1789 LOG $N 1.3509
Claim 6
Dependent Claim
12 words
8349 LOG $N - 1.1376 $ DR $ -2.1789 LOG $N 1.3509
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein the undrawn yarn has a birefringence of 0.01 to 0.025.
Claim 8
Dependent Claim
75 words
The process of claim 1 wherein the undrawn yarn is one which has been aged under the temperature (T* C)-time (t hours) conditions expressed by the following equations 10(2.604 - 0.0486T) < or = t < or = -211.2T + 6424 (where 20*C < or = T < or = 30*C.) or 10(2.604 - 0.0486T) < or = t < or = 10(3.259 - 0.0526T) (where 30*C < or = T < or = 40*C.).
Claim 9
Dependent Claim
36 words
The process of claim 1 wherein the undrawn yarn is one whose moisture content is maintained always at not more than 1.0 % by weight from the end of spinning to the initiation of draw texturing.
Claim 10
Dependent Claim
28 words
The process of claim 1 wherein the undrawn yarn is brought into contact with the surfaces of feed rollers heated at 60* -120*C. for at least 0.05 second.
Claim 11
Dependent Claim
16 words
The process of claim 1 wherein the heat-treating heater is heated to from 160* to 210*C.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the process is carried out while maintaining a twist multiplier expressed by the following equation
Claim 13
Dependent Claim
21 words
The process of claim 1 wherein the process is performed while maintaining the draw texturing speed at 75 to 600 m/min.
Claim 14
Dependent Claim
19 words
The process of claim 2 wherein the process is performed while maintaining the draw ratio at 2.2 to 2.8.
Claim 15
Dependent Claim
40 words
The process of claim 1 wherein the yarn is bent by at least 2 yarn guides provided between the false twister and the draw rollers, and the total sum of the bent angles is adjusted to from 30* to 270*.
Claim 16
Dependent Claim
33 words
The process of claim 10 wherein the process is controlled so that the yarn runs between the heat-treating heater and the false twister for 0.13 to 0.3 second in air at room temperature.
Claim 17
Dependent Claim
106 words
The process of claim 1 wherein the undrawn yarn is made to run from the inlet of the heat-treating heater to a point l mm apart from it while being preheated at 60* to 150*C. without contacting with the heated surface of the heater, and then the yarn is brought into contact with the heated surface of the heater, l above being defined by the following equations l > or = 5 and 0.03x + 0.2y - 15l < or = 0.3x + 2y + 100 wherein x is the denier of the undrawn yarn and y is the speed of feeding the undrawn yarn (m/min.).
Claim 18
Dependent Claim
57 words
The process of claim 7 wherein the operation is started with a false twist multiplier 50 - 85 % of that in normal operation without bringing the yarn into contact with the heat-treating heater, and then the yarn is brought into contact with the heat-treating heater and the false twist multiplier is increased to a predetermined value.
Claim 19
Dependent Claim
23 words
The process of claim 8 wherein yarn stringing is performed by initiating the operation at a draw texturing speed expressed by the equation
Claim 20
Dependent Claim
85 words
The process of claim 1 wherein at the time of initiating the operation, the yarn is strung up by keeping the undrawn yarn from the surface of the heat-treating heater so that it does not come close to it, and then draw texturing of the yarn is started while passing the yarn through a zone maintained at a temperature of 50*C. to 130*C. near the surface of the heat-treating heater, and thereafter, the yarn is brought into contact with the surface of the heat-treating heater.
Claim 21
Dependent Claim
52 words
The process of claim 1 wherein before an undrawn yarn package being processed becomes empty, the end of the undrawn yarn on the package is tied with the forward end of an undrawn yarn on an undrawn yarn package to be processed subsequently, after cold drawing each end of the undrawn yarns.
References Cited (Backward Citations)
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |