Patent US3662440A successfully refreshed from Google Patents.
US3662440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling yarn tension and threadline stability during high speed heat treating of the yarn
Assignee: EIDP Inc
•
Filing: 1970-08-17
•
Granted: 1972-05-16
•
Expires: 1990-08-17
Abstract
Abstract A process for heat treating yarn that includes the steps of feeding the yarn into a stream of heated gas, causing the gas to convey the yarn in a first path while heating it, and subsequently changing the direction of advance of the yarn from said first path to a second path that intersects said first path, is modified to improve threadline stability without increasing tension in the zone where the yarn path changes direction. The modification includes the steps of: interposing a surface in the first path and withdrawing the yarn from the proximity of the surface in the direction of said second path at a rate to provide a single sharp change in direction at said surface toward said second path.
Inventors
- 👤 William Green Hill
- 👤 Whorley William Maxey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:57
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D10/00; D01D10/04; D01D10/0436; D01D10/0481
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
In a process for heat treating yarn that includes the steps of feeding the yarn into a stream of heated gas at a velocity greater than 1,000 yards per minute, causing the gas to convey the yarn in a first path while heating it and changing the direction of advance of the yarn from said first path to a second path that intersects said first path, the improvement comprising the steps of: interposing a surface in said first path approximately perpendicular thereto and withdrawing said yarn from the proximity of said surface in the direction of said second path at a rate to provide a single sharp change of direction at said surface toward said second path.
Claim 2
Dependent Claim
117 words
In a process for heat treating yarn that includes the steps of feeding the yarn into a stream of heated gas at a velocity greater than 1,000 yards per minute, causing the gas to convey the yarn in a first path while heating it and changing the direction of advance of the yarn from said first path to a second path that intersects said first path, the improvement comprising the steps of: interposing a surface in said first path approximately perpendicular thereto and withdrawing said yarn from the proximity of said surface in the direction of said second path at a rate to provide a single sharp change of direction at said surface toward said second path.
Claim 3
Dependent Claim
28 words
The process as defined in claim 1, including the additional step of diverting a part of said gas stream from said first path prior to interposing said surface.
Claim 4
Dependent Claim
27 words
The process as defined in claim 1, said yarn being fed into said stream at a rate greater than the rate at which it approaches said surface.
Claim 5
Dependent Claim
16 words
The process as defined in claim 1, said yarn being a bicomponent differentially heat shrinkable yarn.
Claim 6
Dependent Claim
165 words
In a process for heat treating a heat shrinkable yarn that includes the steps of feeding the yarn at a velocity of from about 3,000 to about 4,000 yards per minute to a heating chamber having a stream of heated gas passing therethrough, causing the gas to impart momentum to and heat the yarn while conveying it from an entrance to an exit of said chamber and into a first path beyond said exit and changing the direction of the advance of said yarn from said first path to a second path that angularly intersects said first path, the improvement comprising: diverting a part of said stream from said first path at said exit; interposing a surface substantially perpendicular to said first path below said exit for dissipating yarn momentum; and withdrawing said yarn from the proximity of said surface in the direction of said second path at a rate to provide a single sharp change in direction at said surface toward said second path.
Claim 7
Dependent Claim
165 words
In a process for heat treating a heat shrinkable yarn that includes the steps of feeding the yarn at a velocity of from about 3,000 to about 4,000 yards per minute to a heating chamber having a stream of heated gas passing therethrough, causing the gas to impart momentum to and heat the yarn while conveying it from an entrance to an exit of said chamber and into a first path beyond said exit and changing the direction of the advance of said yarn from said first path to a second path that angularly intersects said first path, the improvement comprising: diverting a part of said stream from said first path at said exit; interposing a surface substantially perpendicular to said first path below said exit for dissipating yarn momentum; and withdrawing said yarn from the proximity of said surface in the direction of said second path at a rate to provide a single sharp change in direction at said surface toward said second path.
Claim 8
Dependent Claim
22 words
The process as defined in claim 5, said surface being interposed a distance of from 3 to 16 inches from said exit.
Claim 9
Dependent Claim
23 words
The process as defined in claim 5, there being a plurality of said yarns being conveyed in substantially parallel paths toward said surface.
Claim 10
Dependent Claim
27 words
The process as defined in claim 6, said yarns being fed into said chamber at a rate greater than the rate at which they approach said surface.
Claim 11
Dependent Claim
16 words
The process as defined in claim 5, said yarn being a bicomponent differentially heat-shrinkable nylon yarn.
References Cited (Backward Citations)
US2829420A
Cited
US3105349A
Cited
US2959909A
Cited
US2869967A
Cited
US3244785A
Cited
US3558760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |