US3777469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Texturing yarns by false twisting
Assignee: Individual
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Filing: 1971-08-03
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Granted: 1973-12-11
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Expires: 1991-08-03
Abstract
Abstract Untextured yarn is drawn from a producer''s package, threaded through apparatus comprising a tension leveling device, an electric heater and a false twist device and, having been textured thereby, is wound on yarn take-up means. Close to the yarn exit from the heater is a twist stop device which effectively restricts twisting of the yarn to the downstream side thereof, and close to the downstream side of the false twist device is a check device which effectively restricts to the downstream side thereof the tendency of the yarn to relax due to untwisting thereof.
Inventors
- 👤 R Spurgeon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:06
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0286
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
258 words
In a method of false twisting continuous multifilament yarn, the steps comprising A. drawing such a yarn from a source thereof successively through heating, twisting and untwisting zones to yarn take-up means, B. elevating the temperature of the yarn as it passes through the heating zone sufficiently to plasticize but insufficiently to melt the yarn whereby to stress-relieve The same, C. applying a primary twisting effort to the yarn thereby to twist the stress-relieved yarn in one direction as it passes through the twisting zone, D. turning the twisted yarn in the opposite direction as it passes through the untwisting zone whereby to cancel out or remove the twist and relieve the tension induced by said twisting effort, E. effectively stopping the twist at a non-floating terminal positionally fixed in the yarn path at a first point the location of which is such that none of the twist reaches upstream into the heating zone, F. checking the upstream reach of the tendency of the yarn to relax due to untwisting thereof at a non-floating terminal positionally fixed in the yarn path at a second point the location of which is a predetermined fixed distance from the first point aforesaid, G. restraining said yarn to induce predetermined tension therein when a predetermined length of said yarn extends from said yarn take-up means to a location upstream from the upstream one of said terminals, and H. compensating for variations in the length of the yarn extending from said yarn take-up means to said location whereby to maintain the same uniform.
Claim 2
Dependent Claim
258 words
In a method of false twisting continuous multifilament yarn, the steps comprising A. drawing such a yarn from a source thereof successively through heating, twisting and untwisting zones to yarn take-up means, B. elevating the temperature of the yarn as it passes through the heating zone sufficiently to plasticize but insufficiently to melt the yarn whereby to stress-relieve The same, C. applying a primary twisting effort to the yarn thereby to twist the stress-relieved yarn in one direction as it passes through the twisting zone, D. turning the twisted yarn in the opposite direction as it passes through the untwisting zone whereby to cancel out or remove the twist and relieve the tension induced by said twisting effort, E. effectively stopping the twist at a non-floating terminal positionally fixed in the yarn path at a first point the location of which is such that none of the twist reaches upstream into the heating zone, F. checking the upstream reach of the tendency of the yarn to relax due to untwisting thereof at a non-floating terminal positionally fixed in the yarn path at a second point the location of which is a predetermined fixed distance from the first point aforesaid, G. restraining said yarn to induce predetermined tension therein when a predetermined length of said yarn extends from said yarn take-up means to a location upstream from the upstream one of said terminals, and H. compensating for variations in the length of the yarn extending from said yarn take-up means to said location whereby to maintain the same uniform.
Claim 3
Dependent Claim
67 words
The method according to claim 1 wherein stopping the upstream reach of the twist is effected by drawing the yarn across a pair of edges, the yarn approaching the first of said edges, withdrawing from said first edge and approaching the second of said edges, and withdrawing from said second edge moving along a portion of the yarn path substantially in the shape of a square loop.
Claim 4
Dependent Claim
44 words
The method according to claim 2 wherein the yarn is constantly maintained in such firm engagement with the pair of edges over which it is drawn that the latter effectively limit the twist induced in the yarn to the downstream side of said edges.
Claim 5
Dependent Claim
40 words
The method according to claim 3 wherein the portion of the heating zone in which the yarn is stress-relieved is in that portion of the yarn path immediately upstream from the pair of edges over which the yarn is drawn.
Claim 6
Dependent Claim
42 words
The method according to claim 4 wherein the effective heating, twisting and untwisting zones are separate but adjacent each other, and the twisting zone is of such short length that the yarn is not cooled to any significant degree while passing therethrough.
Claim 7
Dependent Claim
69 words
The method according to claim 1 wherein checking the upstream reach of the tendency of the yarn to relax due to untwisting thereof is effected by applying a secondary twisting effort in the same direction in which the primary twisting effort is applied by frictionally clutching the yarn at a location closely adjacent and on the downstream side of the location at which the primary twisting effort is applied.
Claim 8
Dependent Claim
54 words
The method according to claim 6 wherein frictional clutching of the yarn is effective to restrict yarn movement in the upstream direction sufficiently to effectively limit relaxation of the yarn due to untwisting thereof to the downstream side of the location at which the yarn is frictionally clutched and the secondary twist is applied.
Claim 9
Dependent Claim
44 words
The method according to claim 7 wherein the yarn is frictionally clutched at two separate close spaced locations and primary and secondary twisting efforts are applied thereto, and the twisted segment of yarn includes the short length of yarn which extends between said locations.
Claim 10
Dependent Claim
62 words
The method according to claim 7 wherein the primary twisting effort is applied by means of a conventional false twist spindle, a friction disc frictionally clutches the yarn to resist movement thereof in the upstream direction, and the twisted segment of yarn includes the short length of yarn from the friction disc upstream to the pin of the conventional false twist spindle.
Claim 11
Dependent Claim
17 words
A continuous multifilament thermoplastic false twist stretch yarn textured in accordance with the method of claim 1.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |