US4378325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for quenching melt-spun filaments
Assignee: Celanese Corp
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Filing: 1981-04-07
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Granted: 1983-03-29
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Expires: 2001-04-07
Abstract
Abstract Disclosed is a melt-spinning process of the type wherein molten polymer is extruded downwardly through a fiber pack and through coaxial circular rows of holes of a spinneret to form a circularly arranged group of filaments. Quench gas is directed across the filaments emerging from the spinneret, and the cooled filaments are gathered and redirected at a guide, which may be stationary or rotating. The quench gas is delivered by a conduit extending downwardly through the pack and spinneret coaxially relative to the rows of holes and then redirected and discharged laterally outwardly through the group of filaments above the guide.
Inventors
- 👤 Roland Waite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:37
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/088; D01D5/092
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
In a melt-spinning process of the type wherein molten polyester polymer is extruded downwardly through a filter pack and through an annular array of holes of a spinneret to form a circularly arranged group of filaments, quench gas is directed across the filaments emerging from the spinneret, and the filaments are gathered and redirected at a stationary or rotating guide, the improvement wherein essentially all the quench gas is delivered downwardly through said pack and spinneret coaxially relative to and completely within said array of holes and then redirected and discharged radially outwardly through the group of filaments above said guide, thereby bellowing said filaments radially outwardly and minimizing quench gas drag and maximizing quench gas flow, and wherein all said extruded filaments are converged at a common guide, whereby filament birefringence variability is reduced.
Claim 2
Dependent Claim
135 words
In a melt-spinning process of the type wherein molten polyester polymer is extruded downwardly through a filter pack and through an annular array of holes of a spinneret to form a circularly arranged group of filaments, quench gas is directed across the filaments emerging from the spinneret, and the filaments are gathered and redirected at a stationary or rotating guide, the improvement wherein essentially all the quench gas is delivered downwardly through said pack and spinneret coaxially relative to and completely within said array of holes and then redirected and discharged radially outwardly through the group of filaments above said guide, thereby bellowing said filaments radially outwardly and minimizing quench gas drag and maximizing quench gas flow, and wherein all said extruded filaments are converged at a common guide, whereby filament birefringence variability is reduced.
Claim 3
Dependent Claim
21 words
In a process according to claim 1, wherein molten polymer is passed through a plurality of coaxial circular rows of holes.
Claim 4
Dependent Claim
20 words
In a process according to claim 1, which comprises preheating said quench gas to a temperature up to 300° C.
References Cited (Backward Citations)
US3650716A
Cited
US3781393A
Cited
US3969462A
Cited
JPS5227815A
Cited
JPS539293A
Cited
US4259048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |