US3833438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a non-woven web of continuous filaments through the wet stretch spinning method
Assignee: Asahi Kasei Corp
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Filing: 1972-08-30
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Granted: 1974-09-03
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Expires: 1992-08-30
Abstract
Abstract A plurality of filaments are extruded simultaneously from a large number of spinning orifices arranged in a rectangular pattern. The filaments are contacted by a coagulating bath as they pass downwardly through a funnel arrangement to cause stretching and coagulation of the filaments prior to depositing the filaments onto a moving pervious conveyor which is oscillated periodically in a direction transverse to its direction of movement.
Inventors
- 👤 T Kaneko
- 👤 T Turumi
- 👤 S Emori
- 👤 K Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:38
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; D04H3/013; D04H3/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A process for the manufacture of a non-woven fabric web composed of wet spun filaments prepared through a conventional wet spinning method, as set forth in the foregoing claim 1, said process further comprising; introducing a coagulating bath liquid into a coagulating funnel in an overflow manner and at a constant static head; and guiding said bath liquid through a funnel passage having a gradually reducing cross-sectional flow area as the flow descends, together with said spun filaments, said bath liquid flowing in a rectified and undisturbed state substantially in the form of a curtain wall enveloping said filaments which are finally arranged substantially in a filament curtain.
Claim 2
Dependent Claim
37 words
The process as claimed in the foregoing claim 2, further comprising subjecting a suction box Arranged below said conveyor to lateral oscillations having equal phase and amplitude with the those of the lateral oscillations of said conveyor.
Claim 3
Dependent Claim
142 words
A process for the manufacture of a non-woven web of continuous filaments through the web stretch spinning method as set forth in the foregoing claim 1, said process comprising the following steps of: extruding a large number of filaments of a spinning solution through a corresponding number of extrusion orifices arranged substantially within an elongated rectangular area and bringing these extruded filaments into contact with a flowing coagulation bath liquid in a coagulation zone for coagulation and stretching; supplying to said coagulation zone consisting of at least a two stage funnel-shaped flowing bath, a coagulation bath liquid with laminar flow to each stage; casting these wet-spun, coagulated and stretching filaments arranged in the form of a vertical curtain, together with a sheet-like flow of the coagulation bath liquid discharged from said zone and enveloping said filament curtain, onto an advancing pervious conveyor.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |