US4352650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nozzle for flash-extrusion apparatus
Assignee: EIDP Inc
•
Filing: 1981-03-24
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Granted: 1982-10-05
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Expires: 2001-03-24
Abstract
Abstract An improved nozzle is provided for the spinneret pack of an apparatus for flash-extruding a polymer solution to form a plexifilamentary strand. The improved nozzle contains a flared tunnel that is coaxial with and immediately downstream of the extrusion orifice. The tunnel, which has a minimum diameter that is at least four times the diameter of the orifice and a flare angle in the range of 10 to 35 degrees, permits increases in throughput without accompanying decreases in the tenacity of the plexifilamentary strand.
Inventors
- 👤 Larry R. Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:00
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/11; D01D4/00; D01D4/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
In a flash-extrusion apparatus of the type which includes a nozzle having a tunnel immediately downstream of and coaxial with an exit orifice, the minimum tunnel diameter being at least four times as large as the orifice diameter, the improvement comprising a flared tunnel having a diameter that increases from inlet to outlet with a flare angle in the range of 10 to 35 degrees and a length that is in the range of 0.6 to 1.0 times the minimum diameter and 0.45 to 0.85 times the maximum diameter of the tunnel.
Claim 2
Dependent Claim
92 words
In a flash-extrusion apparatus of the type which includes a nozzle having a tunnel immediately downstream of and coaxial with an exit orifice, the minimum tunnel diameter being at least four times as large as the orifice diameter, the improvement comprising a flared tunnel having a diameter that increases from inlet to outlet with a flare angle in the range of 10 to 35 degrees and a length that is in the range of 0.6 to 1.0 times the minimum diameter and 0.45 to 0.85 times the maximum diameter of the tunnel.
Claim 3
Dependent Claim
37 words
The apparatus of claim 1 wherein the flare angle is in the range of 15 to 25 degrees and the length is 0.80 to 1.0 times the minimum diameter and 0.60 to 0.80 times the maximum diameter.
Claim 4
Dependent Claim
44 words
The apparatus of claim 1 or 2 wherein the exit diameter of the tunnel is greater than 1 centimeter but no greater than 1.3 centimeters and the minimum diameter of the tunnel is in the range of 5 to 6 times the orifice diameter.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |