US3920362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament forming apparatus with sweep fluid channel surrounding spinning needle
Assignee: Individual
•
Filing: 1974-02-11
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Granted: 1975-11-18
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Expires: 1994-02-11
Abstract
Abstract A congealable synthetic material, for example, a melted thermoplastic, is formed into a filament by causing its removal in a fine stream from the tip of a pointed solid element to the surface of which the congealable material is fed at a controlled rate. The removal of the congealable material from the point of the pointed element is effected by directing a stream of fluid along the element toward the point while the fluid attenuates the withdrawn filament before it congeals. After leaving the point of the element, the material of the filament congeals, or is congealed, to form a dimensionally stable fiber or filament.
Inventors
- 👤 Rexford H Bradt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:22
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
An apparatus for making filaments of uniform diameter and free of beaded ends from a congealable liquid material comprising, in combination, a spinning element in the shape of an elongated needle having a longitudinal axis and an outer surface facing outwardly away from said axis and tapering inwardly in one axial direction of said spinning element to a spinning point, nozzle means for supplying congealable liquid material to substantially the entire outer surface of said spinning element at a region thereof which is axially spaced from said spinning point, wall means substantially surrounding the spinning element in radially spaced relation thereto and forming a channel surrounding and extending axially of said spinning element for the flow of sweep fluid in one axial direction along said spinning element and on beyond the spinning point in said one axial direction so that fluid impelled in said axial direction within the channel will cause the liquid material to flow around the spinning element to the spinning point, whereby the fluid will draw the liquid material from the spinning point as a filament and will convey the filament away from the spinning point while attenuating the filament.
Claim 2
Independent Claim
193 words
An apparatus for making filaments of uniform diameter and free of beaded ends from a congealable liquid material comprising, in combination, a spinning element in the shape of an elongated needle having a longitudinal axis and an outer surface facing outwardly away from said axis and tapering inwardly in one axial direction of said spinning element to a spinning point, nozzle means for supplying congealable liquid material to substantially the entire outer surface of said spinning element at a region thereof which is axially spaced from said spinning point, wall means substantially surrounding the spinning element in radially spaced relation thereto and forming a channel surrounding and extending axially of said spinning element for the flow of sweep fluid in one axial direction along said spinning element and on beyond the spinning point in said one axial direction so that fluid impelled in said axial direction within the channel will cause the liquid material to flow around the spinning element to the spinning point, whereby the fluid will draw the liquid material from the spinning point as a filament and will convey the filament away from the spinning point while attenuating the filament.
Claim 3
Dependent Claim
34 words
An apparatus according to claim 1 wherein the wall means includes at least one additional fluid passage adjacent the channel and having a discharge orifice positioned to discharge fluid against the filament being formed.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1 in which support means is provided for mounting the spinning element within said nozzle means.
Claim 5
Dependent Claim
33 words
An apparatus according to claim 3 wherein the spinning element has a diameter less than that of the orifice of the nozzle and extends forwardly through and beyond the orifice of the nozzle.
Claim 6
Dependent Claim
44 words
An apparatus according to claim 1 including an annular series of nozzle means having fluid discharge orifices disposed around the axis of the spinning point so that fluid flowing from the discharge orifices will cause a twist to be imparted to the filament formed.
Claim 7
Dependent Claim
40 words
An apparatus according to claim 1 including at least one additional said spinning element and wall means in spaced relation, each said spinning element having liquid material and sweep fluid supplied thereto whereby a plurality of filaments are formed simultaneously.
Claim 8
Dependent Claim
17 words
An apparatus according to claim 6 in which said spinning elements are disposed in coplanar aligned relation.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |