US4078034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air gage spinning process
Assignee: EIDP Inc
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Filing: 1976-12-21
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Granted: 1978-03-07
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Expires: 1996-12-21
Abstract
Abstract The strength of aromatic polyamide filaments spun at high speed downwardly through a non-coagulating fluid into a liquid coagulating bath and subsequently through a spin tube containing the freshly spun filaments and coagulating liquid is improved when the filaments are abruptly deflected away from the walls of the spin tube a distance of 0.025 to 0.15 times the inside diameter of the spin tube.
Inventors
- 👤 Gary Brett Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:29
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01F6/605; D01D; D01D5/00; D01D5/06; D01D5/12; D01D5/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A process for spinning a solution of an aromatic polyamide downwardly through a noncoagulating fluid into a liquid coagulating bath and subsequently through a spin tube containing freshly spun filaments and coagulating liquid at a spinning speed of at least 300 mpm wherein the freshly spun filaments and coagulating liquid are abruptly deflected away from the walls of the spin tube a distance of 0.025 to 0.15 times the inside diameter of the spin tube, the deflection being at the entrance of the spin tube or at a point no further from the entrance than the filaments will travel in 0.002 seconds at the spinning speed being used.
Claim 2
Dependent Claim
108 words
A process for spinning a solution of an aromatic polyamide downwardly through a noncoagulating fluid into a liquid coagulating bath and subsequently through a spin tube containing freshly spun filaments and coagulating liquid at a spinning speed of at least 300 mpm wherein the freshly spun filaments and coagulating liquid are abruptly deflected away from the walls of the spin tube a distance of 0.025 to 0.15 times the inside diameter of the spin tube, the deflection being at the entrance of the spin tube or at a point no further from the entrance than the filaments will travel in 0.002 seconds at the spinning speed being used.
Claim 3
Dependent Claim
20 words
Process of claim 1 wherein the deflection distance is 0.05 to 0.125 times the inside diameter of the spin tube.
Claim 4
Dependent Claim
16 words
Process of claim 1 wherein the filaments are deflected at the entrance of the spin tube.
Claim 5
Dependent Claim
18 words
Process of claim 1 wherein the filaments pass through the spin tube in about 0.03 seconds or less.
Claim 6
Dependent Claim
17 words
Process of claim 4 wherein the filaments pass through the spin tube in less than 0.01 seconds.
Claim 7
Dependent Claim
43 words
Process of claim 3 wherein the filaments are additionally deflected away from the walls of the spin tube a distance of 0.025 to 0.15 times the inside diameter of the spin tube, the additional deflection being at the exit of the spin tube.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |