Patent US3977175A successfully refreshed from Google Patents.
US3977175A
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Draw-texturing polyester yarns
Assignee: Teijin Ltd
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Filing: 1974-12-09
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Granted: 1976-08-31
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Expires: 1994-12-09
Abstract
Abstract Textured polyester yarn is prepared from multifilament yarn composed of a synthetic linear ethylene terephthalate polyester by draw-texturing at a draw ratio of 1.05 - 1.30X, using a heat-setting temperature of about 170° - 240°. Feed yarn for said draw-texturing process has (a) a break elongation of 40 - 80%, (b) a density of above 1.371 g/cm 3 , and (c) a boil-off shrinkage of less than 8%. Said feed yarn is prepared by modified melt spinning of the foregoing polyester at a speed of about 3000 - 5000 meters per minute.
Inventors
- 👤 Hirofumi Yoshikawa
- 👤 Isao Hamana
- 👤 Shiro Kumakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0286
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
89 words
A process for producing a textured yarn from a feed yarn consisting essentially of a synthetic substantially linear ethylene terephthalate polyester multifilament containing at least 85 mol % of ethylene terephthalate units, which comprises drawing and false-twist texturing the feed yarn at a draw ratio of 1.05 - 1.30X using a heating zone having a heat-setting temperature of about 170° - 240°C, said feed yarn having (a) a break elongation of 40-80%, (b) a density of above 1.371 g/cm 3 and (c) a boil-off shrinkage of less than 8%.
Claim 2
Dependent Claim
89 words
A process for producing a textured yarn from a feed yarn consisting essentially of a synthetic substantially linear ethylene terephthalate polyester multifilament containing at least 85 mol % of ethylene terephthalate units, which comprises drawing and false-twist texturing the feed yarn at a draw ratio of 1.05 - 1.30X using a heating zone having a heat-setting temperature of about 170° - 240°C, said feed yarn having (a) a break elongation of 40-80%, (b) a density of above 1.371 g/cm 3 and (c) a boil-off shrinkage of less than 8%.
Claim 3
Dependent Claim
59 words
A process according to claim 1 wherein the feed yarn has (a) a break elongation of 50-75%, (b) a density of 1.372 - 1.395 g/cm 3 , (c) a boil-off shrinkage of 1-7%, (d) a birefringence of 0.09 14 0.14, (e) an initial modulus of 600-1100 kg/mm 2 and (f) a tenacity of 3 - 4 grams per denier.
Claim 4
Dependent Claim
55 words
A process according to claim 2 wherein the feed yarn has (a) a break elongation of 60 -70%, (b) a density of 1.373 - 1.394 g/cm 3 , (c) a boil-off shrinkage of 2 - 6%, (d) a birefringence of 0.10 ° 0.13, and (e) an initial modulus of 700 - 900 kg/mm 2 .
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein the feed yarn has a titer of 2 - 7 denier per filament.
Claim 6
Dependent Claim
31 words
A process according to claim 2 wherein the feed yarn has a strength at first yield point of 1.0 - 1.8 grams per denier and a crystal size of 30-45 angstroms.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein the drawing and false-twist texturing are simultaneously conducted.
Claim 8
Dependent Claim
19 words
A process according to claim 1 wherein the yarn is draw-textured at a draw ratio of 1.10 - 1.25X.
Claim 9
Dependent Claim
20 words
A process according to claim 1 wherein the yarn is draw-textured at a heat-setting temperature of about 180° - 230°C.
Claim 10
Dependent Claim
45 words
A process according to claim 1 wherein the draw-textured yarn is subjected to a second heat-setting at a temperature of about 190° - 240°C and exceeding the temperature used in the initial heat setting by about 10°C, to produce an U-type low crimped textured yarn.
Claim 11
Dependent Claim
16 words
A process according to claim 9 wherein the second heat-setting temperature is about 200° - 240°C.
Claim 12
Dependent Claim
16 words
The process according to claim 9 wherein the initial heat-setting temperature is about 170° - 220°C.
Claim 13
Dependent Claim
16 words
The process according to claim 11 wherein the initial heat-setting temperature is about 180° - 210°C.
Claim 14
Dependent Claim
23 words
A process according to claim 1 wherein the heat-setting temperature is about 190° - 240°C to produce an O-type highly crimped textured yarn.
Claim 15
Dependent Claim
23 words
A process according to claim 13 wherein the heat-setting temperature is about 210° - 230°C, to produce an O-type highly crimped textured yarn.
Claim 16
Dependent Claim
106 words
A process according to claim 1 wherein the feed yarn is prepared by a modified melt-spinning process which comprises (i) extruding the synthetic linear ethylene terephthalate polyester having an intrinsic viscosity of 0.3 - 1.0 through a spinneret to form the filaments, (ii) cooling the filaments to a temperature of below (Tg + 40°C), wherein Tg means the second order transition temperature, (iii) passing the filaments through the heating zone having a length of about 100 - 200 cm heated at a temperature of about 140° - 210°C, and then (iv) winding up the obtained yarn at a speed of 2600 - 5500 meters per minute.
Claim 17
Dependent Claim
29 words
A process according to claim 15 wherein the filaments are cooled to a temperature of from (Tg - 20°C) to (Tg + 20°C) before passing through the heating zone.
Claim 18
Dependent Claim
22 words
A process according to claim 15, wherein the yarn is wound up at a speed of 3000 - 5000 meters per minute.
Claim 19
Dependent Claim
16 words
A process according to claim 15, wherein the heating zone is provided in a heating tube.
Claim 20
Dependent Claim
16 words
A process according to claim 15, wherein the heating zone is provided by a slit heater.
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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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |