Patent US4240864A successfully refreshed from Google Patents.
US4240864A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray spinning collection unit
Assignee: Veolia WTS Solutions USA Inc
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Filing: 1979-05-25
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Granted: 1980-12-23
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Expires: 1999-05-25
Abstract
Abstract A spray spinning collection unit includes a cylindrical collection mandrel and a cooperating press roll. The cooperating press roll has a peripheral surface disposed adjacent to a cylindrical surface of the mandrel so as to define a gap therebetween. To provide a predetermined radial density gradient in a cylindrical nonwoven product formed by the gap between the press roll and the mandrel, the gap has a varying height defined by the contour of the peripheral surface. The contour is selected to give the predetermined radial density gradient. Portions of the peripheral surface of the press roll may be either convex, concave, or both.
Inventors
- 👤 Victor J. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:23
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/02; D04H3/07; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D29/33; B01D29/35; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/069; B01D2239/0695; B01D2239/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
Spray spinning apparatus form making a tubular non-woven product of indefinite length having a predetermined radial density gradient, comprising: spray spinning means for producing a plurality of substantially continuous filaments of synthetic resinous material, attenuating the filaments, and conveying the filaments in a stream such that the filaments have a predetermined distribution along a line passing transversely through the filament stream; and collection means positioned transversely of the filament stream, operable to collect the filaments and form a tubular non-woven product of indefinite length therefrom, and including mandrel means operable to receive the filaments along an axial extent thereof and having a cylindrical surface, and press roll means operable in conjunction with the mandrel means to urge the collected filaments axially off the mandrel means as a tubular product of indefinite length, and including a contoured surface which cooperates with the cylindrical surface to define a gap of varying radial height in which the predetermined distribution of filaments is collected and compressed to a predetermined radial density gradient.
Claim 2
Dependent Claim
168 words
Spray spinning apparatus form making a tubular non-woven product of indefinite length having a predetermined radial density gradient, comprising: spray spinning means for producing a plurality of substantially continuous filaments of synthetic resinous material, attenuating the filaments, and conveying the filaments in a stream such that the filaments have a predetermined distribution along a line passing transversely through the filament stream; and collection means positioned transversely of the filament stream, operable to collect the filaments and form a tubular non-woven product of indefinite length therefrom, and including mandrel means operable to receive the filaments along an axial extent thereof and having a cylindrical surface, and press roll means operable in conjunction with the mandrel means to urge the collected filaments axially off the mandrel means as a tubular product of indefinite length, and including a contoured surface which cooperates with the cylindrical surface to define a gap of varying radial height in which the predetermined distribution of filaments is collected and compressed to a predetermined radial density gradient.
Claim 3
Dependent Claim
18 words
The spray spinning apparatus of claim 1 wherein the contoured surface of the press roll means is concave.
Claim 4
Dependent Claim
26 words
The spray spinning apparatus of claim 2 wherein the press roll means surface is configured so that the gap height provides a constant radial density gradient.
Claim 5
Dependent Claim
34 words
The spray spinning apparatus of claim 2 wherein the press roll means surface is configured so that the gap height provides a radial density gradient which decreases with increasing radius from the cylindrical surface.
Claim 6
Dependent Claim
34 words
The spray spinning apparatus of claim 2 wherein the press roll means surface is configured so that the gap height provides a radial density gradient which increases with increasing radius from the cylindrical surface.
Claim 7
Dependent Claim
18 words
The spray spinning apparatus of claim 1 wherein the contoured surface of the press roll means in convex.
Claim 8
Dependent Claim
20 words
The spray spinning apparatus of claim 1 wherein a portion of the contoured surface of the press roll is concave.
Claim 9
Dependent Claim
20 words
the spray spinning apparatus of claim 1 wherein a portion of the contoured surface of the press roll is convex.
Claim 10
Dependent Claim
20 words
The spray spinning apparatus of claim 7, wherein another portion of the contoured surface of the press roll is convex.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |