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US 4,285,452 AGranted
System and method for dispersing filaments
AssigneeCrown Zellerbach Corporation
InventorsImants Reba, Edward C. Wolthausen
Life of this patent
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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.
Claims13
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.
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.
Dependencies are inferred from the claim text.