US4285452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for dispersing filaments
Assignee: Fort James Corp
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Filing: 1979-08-20
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Granted: 1981-08-25
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Expires: 1999-08-20
Abstract
Abstract A system and method are provided for dispersing a plurality of filaments, moving at high velocity, without substantial fiber aggregation, for subsequent uniform deposition on a web-forming surface, by the use of opposed Coanda nozzles. The Coanda nozzles are operated under nonsteady-state conditions whereby a substantially nonsymmetrical filament pattern is created between the opposed Coanda surfaces.
Inventors
- 👤 Imants Reba
- 👤 Edward C. Wolthausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:42
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; D04H3/03
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
173 words
A method for producing a plurality of filaments in a dispersed condition, which comprises: (a) discharging said filaments in a downward direction at high velocity; (b) introducing said discharged filaments into a dispersion region formed between opposed Coanda nozzles, said Coanda nozzles comprising an auxiliary fluid supply means and opposed Coanda surfaces; (c) applying a Coanda effect to said discharged filaments within the dispersion region by transporting a pulsating fluid intermittently in an alternating mode, from said auxiliary supply means and attaching said pulsating fluid to the outer surfaces of said opposed Coanda surfaces under conditions whereby the fluid flow follows the curved contour of said Coanda surfaces to create said Coanda effect, thereby causing nonsteady-state conditions with respect to the opposed Coanda surfaces to be created, and a nonsymmetrical filament flow pattern to be formed within the dispersion region, so that the filaments move in a downward direction past said opposed Coanda nozzles and are alternatively oscillated in a plane perpendicular to said Coanda surfaces by the action of the Coanda effect.
Claim 2
Independent Claim
173 words
A method for producing a plurality of filaments in a dispersed condition, which comprises: (a) discharging said filaments in a downward direction at high velocity; (b) introducing said discharged filaments into a dispersion region formed between opposed Coanda nozzles, said Coanda nozzles comprising an auxiliary fluid supply means and opposed Coanda surfaces; (c) applying a Coanda effect to said discharged filaments within the dispersion region by transporting a pulsating fluid intermittently in an alternating mode, from said auxiliary supply means and attaching said pulsating fluid to the outer surfaces of said opposed Coanda surfaces under conditions whereby the fluid flow follows the curved contour of said Coanda surfaces to create said Coanda effect, thereby causing nonsteady-state conditions with respect to the opposed Coanda surfaces to be created, and a nonsymmetrical filament flow pattern to be formed within the dispersion region, so that the filaments move in a downward direction past said opposed Coanda nozzles and are alternatively oscillated in a plane perpendicular to said Coanda surfaces by the action of the Coanda effect.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said pulsating fluid is supplied at low pressure.
Claim 4
Dependent Claim
29 words
The method of claim 2, wherein the pressure at the exit of said auxiliary fluid supply means is maintained at from about 5 psig up to about 30 psig.
Claim 5
Dependent Claim
32 words
The method of claim 1, wherein the velocity of said downwardly discharged filaments is at least about 150 feet per second, up to a maximum velocity of about 450 feet per second.
Claim 6
Dependent Claim
39 words
The method of claim 1, wherein the pulsating action of the fluid as it exits the auxiliary supply means is maintained at a fluid-pulsating rate of from about 5 pulses per second, up to about 100 pulses per second.
Claim 7
Dependent Claim
14 words
The method of claim 1, wherein said filaments are comprised of heavy denier filaments.
Claim 8
Independent Claim
116 words
A system for producing a plurality of filaments in a dispersed condition, which comprises (a) opposed Coanda nozzles adapted to create a nonsteady-state, nonsymmetrical filament flow pattern by the application of a Coanda effect to said filaments, the Coanda nozzles comprising opposed Coanda surfaces and an auxiliary means for supplying a pulsating fluid in an intermittent, alternating mode, respectively; and (b) means for discharging said filaments, in a fluid medium, at high velocity, into a dispersion region formed between said opposed Coanda nozzles, wherein, as the filaments move in a downward direction past the opposed Coanda nozzles, the filaments are oscillated in a plane perpendicular to the Coanda surfaces by the action of the Coanda effect.
Claim 9
Independent Claim
116 words
A system for producing a plurality of filaments in a dispersed condition, which comprises (a) opposed Coanda nozzles adapted to create a nonsteady-state, nonsymmetrical filament flow pattern by the application of a Coanda effect to said filaments, the Coanda nozzles comprising opposed Coanda surfaces and an auxiliary means for supplying a pulsating fluid in an intermittent, alternating mode, respectively; and (b) means for discharging said filaments, in a fluid medium, at high velocity, into a dispersion region formed between said opposed Coanda nozzles, wherein, as the filaments move in a downward direction past the opposed Coanda nozzles, the filaments are oscillated in a plane perpendicular to the Coanda surfaces by the action of the Coanda effect.
Claim 10
Dependent Claim
20 words
The system of claim 7, wherein said auxiliary fluid supply means includes fluid outlet means which engages said Coanda surfaces.
Claim 11
Dependent Claim
16 words
The system of claim 8, wherein said fluid outlet means is attached to said Coanda surfaces.
Claim 12
Dependent Claim
38 words
The system of claim 8, wherein said fluid outlet means engages said Coanda surfaces at the converging portions of said Coanda surfaces, thereby promoting the fluid downwardly along the curve of contour thereof to create said Coanda effect.
Claim 13
Dependent Claim
20 words
The apparatus of claim 7, wherein said discharge means includes means for providing for a two-dimensional disperion of said filaments.
Claim 14
Dependent Claim
16 words
The system of claim 11, wherein said two-dimensional dispersion means comprises a fan-shaped, diverging nozzle means.
Claim 15
Dependent Claim
14 words
The system of claim 7, wherein said filaments are comprised of heavy denier filaments.
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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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |