US4238439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing self-crimping polyamide yarns
Assignee: Solutia Inc
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Filing: 1977-10-06
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Granted: 1980-12-09
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Expires: 1997-10-06
Abstract
Abstract A melt spinning process for producing nominal 20 denier per filament polyamide yarn having a latent bulk of at least 18% is provided. The process employs polyhexamethylene adipamide modified to contain from 1 to 10 mole % of recurring units of the formula <IMAGE> whereby wind-up speeds ranging from 1830 to 4570 meters per minute and higher are attainable. The resulting yarn has a usable bulk, when developed, for carpet yarn applications without further texturing of the yarn.
Inventors
- 👤 Jae C. Hyun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:12
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01D5/23
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
A melt spinning process for producing a multifilament polyamide yarn having at latent bulk of at least 18%, comprising (a) extruding at a given extrusion rate through spinneret orifices of trilobal or triskellion cross-section a fiber-forming polyamide consisting essentially of randomly recurring units of the formula ##STR4## wherein the mole ratio of (i) units to (ii) units is in the range of from about 90:10 to about 99:1, to form a molten stream; (b) differentially quenching said molten streams by exposing one side thereof to transversely flowing air in a cooling zone to provide filaments (c) withdrawing said filaments from said cooling zone by passing said filaments around at least one rotatable roll with a least a partial wrap; and (d) collecting said filaments under tension on a take-up bobbin; wherein the peripheral speed of said rotatable roll(s) is at least 2000 yards (1828.8 meters) per minute and is correlated with said extrusion rate to provide a drawn yarn having a denier per filament of at least 18 and wherein said filaments have a modification ratio greater than 1.2 and less than 4.0.
Claim 2
Dependent Claim
183 words
A melt spinning process for producing a multifilament polyamide yarn having at latent bulk of at least 18%, comprising (a) extruding at a given extrusion rate through spinneret orifices of trilobal or triskellion cross-section a fiber-forming polyamide consisting essentially of randomly recurring units of the formula ##STR4## wherein the mole ratio of (i) units to (ii) units is in the range of from about 90:10 to about 99:1, to form a molten stream; (b) differentially quenching said molten streams by exposing one side thereof to transversely flowing air in a cooling zone to provide filaments (c) withdrawing said filaments from said cooling zone by passing said filaments around at least one rotatable roll with a least a partial wrap; and (d) collecting said filaments under tension on a take-up bobbin; wherein the peripheral speed of said rotatable roll(s) is at least 2000 yards (1828.8 meters) per minute and is correlated with said extrusion rate to provide a drawn yarn having a denier per filament of at least 18 and wherein said filaments have a modification ratio greater than 1.2 and less than 4.0.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein said at least one rotatable roll consists of a driven roll and an associated separator roll around which the filaments make a plurality of wraps.
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein the mole ratio of (i) units to (ii) units is between about 92.5:7.5 and about 97.5:2.5.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein said peripheral speed is at least 3000 yards (2743.2 meters) per minute.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein the resulting yarn has a denier per filament of about 20.
Claim 7
Dependent Claim
18 words
The process of claim 2 wherein the mole ratio of (i) units to (ii) units is about 95:5.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein said peripheral speed is at least 5000 yards (4572 meters) per minute.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein the resulting yarn has a denier per filament of about 20.
Claim 10
Dependent Claim
20 words
The process of claim 8 wherein said filaments are withdrawn from said driven roll by means of a take-up device.
References Cited (Backward Citations)
US2957747A
Cited
JPS4828012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |