US3724191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of synthetic yarns
Assignee: TMM RES Ltd
•
Filing: 1970-12-14
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Granted: 1973-04-03
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Expires: 1990-12-14
Abstract
Abstract In a method of treating a synthetic yarn, the yarn is advanced over a heat transfer element by the passage of the yarn at one end or at each end of the element over guide means which causes a reversal of the direction of travel of the yarn over the element and a transfer of the yarn from a path in contact with one side of the element to a path in contact with the other side of the element and which is stationarily arranged or arranged in operation to revolve at a speed less than that of the contacting traveling yarn. The yarn upon leaving the element is twisted by twisting means with the twist running back to the yarn passing over the element beyond the guide means or beyond at least the last contacted guide means.
Inventors
- 👤 N Hooper
- 👤 T Gurnshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/0226; D02G1/0266
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
126 words
A method of treating a synthetic yarn comprising the steps of advancing said yarn over a heat transfer element, reversing the direction of travel of the yarn over the element with guide means and transferring the yarn from a path in contact with one side of the element to a path in contact with the other side of the element, maintaining the linear speed of advancement of the yarn at a rate which is relatively greater than the linear speed of the portions of the guide means which are in instantaneous contact with the travelling yarn, and then imparting to said yarn, as it leaves the element, twist which runs back to the yarn passing over the element beyond at least the last contacted guide means.
Claim 2
Independent Claim
126 words
A method of treating a synthetic yarn comprising the steps of advancing said yarn over a heat transfer element, reversing the direction of travel of the yarn over the element with guide means and transferring the yarn from a path in contact with one side of the element to a path in contact with the other side of the element, maintaining the linear speed of advancement of the yarn at a rate which is relatively greater than the linear speed of the portions of the guide means which are in instantaneous contact with the travelling yarn, and then imparting to said yarn, as it leaves the element, twist which runs back to the yarn passing over the element beyond at least the last contacted guide means.
Claim 3
Dependent Claim
14 words
A method as claimed in claim 1 wherein the twist imparted is false twist.
Claim 4
Dependent Claim
39 words
A method as claimed in claim 1 and further comprising assisting the advancement of the yarn to the heat transfer element by a driven roller situated between at least one guide means and an adjacent end of the element.
Claim 5
Dependent Claim
46 words
A method as claimed in claim 3 further comprising the step of passing the yarn in contact successively with said one side of the heat transfer element, the said other side of the heat transfer element and then said one side of the transfer element again.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 1 and further comprising the step of fully drawing the yarn before advancing the yarn over the heat transfer element.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5 wherein the yarn is overfed by up to 7 percent over the heat transfer element to driven delivery rollers situated beyond the twisting means.
Claim 8
Dependent Claim
34 words
A method as claimed in claim 1 and further comprising the step of partially drawing the yarn to meet a predetermined minimum draw ratio requirement before advancing the yarn over the heat transfer element.
Claim 9
Dependent Claim
39 words
A method as claimed in claim 7 wherein the partial drawing of the yarn is performed by underfeeding the yarn by up to 7 percent over the heat transfer element to driven delivery rollers situated beyond the twisting means.
Claim 10
Dependent Claim
36 words
A method as claimed in claim 1 further comprising the step of preventing twist from running forwardly of the twisting means by situating a peg beyond the twisting means and wrapping the yarn around the peg.
Claim 11
Dependent Claim
24 words
A method as claimed in claim 1 wherein the yarn is a polyester yarn such as polyethylene terephthalate or a polyamide such as nylon.
Claim 12
Dependent Claim
19 words
A method of treating a synthetic yarn as set forth in claim 1 wherein the guide means are stationary.
Claim 13
Dependent Claim
48 words
A method as set forth in claim 1 wherein is included the step of rotating said guide means at a rate to provide a linear speed at the portions thereOf in instantaneous contact with the yarn which is relatively less than the forward linear speed of the yarn.
Claim 14
Dependent Claim
30 words
A method as set forth in claim 1 wherein is included the step of rotating said guide means in a direction counter to the direction of advancement of the yarn.
Claim 15
Dependent Claim
162 words
Apparatus for treating a synthetic yarn comprising a heat transfer element over which the yarn is passed in contact therewith, twisting means arranged to impart twist to said yarn upon leaving said element and yarn guide means at at least one end of said element over which the yarn is caused to pass and which causes a reversal of the direction of travel of the yarn over the heat element and the transfer of the yarn from a path in contact with one side of the element to a path in contact with the other side of the element, means for advancing the yarn over said guide means at a linear speed of advancement which is relatively greater than the linear speed of the portions of said yarn guide means which are in instantaneous contact with the travelling yarn, whereby twist imparted to the yarn runs back along the yarn passing over the element beyond at least the last contacted guide means.
Claim 16
Dependent Claim
162 words
Apparatus for treating a synthetic yarn comprising a heat transfer element over which the yarn is passed in contact therewith, twisting means arranged to impart twist to said yarn upon leaving said element and yarn guide means at at least one end of said element over which the yarn is caused to pass and which causes a reversal of the direction of travel of the yarn over the heat element and the transfer of the yarn from a path in contact with one side of the element to a path in contact with the other side of the element, means for advancing the yarn over said guide means at a linear speed of advancement which is relatively greater than the linear speed of the portions of said yarn guide means which are in instantaneous contact with the travelling yarn, whereby twist imparted to the yarn runs back along the yarn passing over the element beyond at least the last contacted guide means.
Claim 17
Dependent Claim
37 words
Apparatus as claimed in claim 14 wherein a drivable roller is situated between at least one guide means and an adjacent end of the element for assisting the movement of the yarn over the heat transfer element.
Claim 18
Dependent Claim
25 words
Apparatus as claimed in claim 14 wherein said twisting means comprises a rotary false twist bush for imparting false twist to the yarn passing therethrough.
Claim 19
Dependent Claim
39 words
Apparatus as claimed in claim 14 wherein said twisting means comprises a pair of rotary false twist bushes for successively imparting false twist to the yarn which passes first to one of the bushes and then to the other.
Claim 20
Dependent Claim
23 words
Apparatus as claimed in claim 14 and further comprising yarn drawing means for drawing the yarn before it passes the heat transfer element.
Claim 21
Dependent Claim
55 words
Apparatus as claimed in claim 18 wherein the yarn drawing means comprises a draw roller assembly around which the yarn forms a plurality of wraps and a nip roller which cooperates with the draw roller assembly to nip one of the yarn wraps and prevents twist in the yarn running back to the draw zone.
Claim 22
Dependent Claim
30 words
Apparatus as claimed in claim 14 and further comprising a snubbing pin engaged by the yarn after leaving the twisting means for preventing twist running forwardly of the snubbing pin.
Claim 23
Dependent Claim
17 words
Apparatus for treating synthetic yarn as set forth in claim 14 wherein said guide means are stationary.
Claim 24
Dependent Claim
52 words
Apparatus as set forth in claim 14 wherein said guide means are rotatable, there being included means for rotating the guide means at a rate to provide a linear speed at the portions thereof in instantaneous contact with the yarn which is relatively less than the forward linear speed of the yarn.
Claim 25
Dependent Claim
34 words
Apparatus as set forth in claim 14 wherein said guide means are rotatable, there being included means for rotating the guide means in a direction counter to the direction of advancement of the yarn.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |