Patent US3925525A successfully refreshed from Google Patents.
US3925525A
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Spinning method
Assignee: Celanese Corp
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Filing: 1973-08-10
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Granted: 1975-12-09
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Expires: 1993-08-10
Abstract
Abstract Liquid polymeric materials, in a fiber spinning operation, are extruded through extrusion passageways of a spinneret plate. The passageways are designed to establish an essentially constant extensional strain rate condition for flow of liquid.
Inventors
- 👤 Herman L Lanieve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:13
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
70 words
IN A METHOD OF SPINING FIBERS FROM FIBER-FORMING, LIQUID POLYMERIC MATERIAL UTILIZING A SPINNERET FOR EXTRUDING SAID MATERIAL THROUGH AT LEAST ONE CONVERGING NOZZLE PASSAGEWAY HAVING AN ENTRY OPENING AND AN EXIST ORIFICE, THE IMPROVEMENT COMPRISING ESTABLISHING AN ESSENTIALLY CONSTANT EXTENSIONAL STRAIN RATE CONDITION FOR FLOW OF SAID LIQUID THROUGH SAID PASSAGEWAY BY PROVIDING A NOZLE PASSAGEWAY BOUNDED BY GRADUALLY CURVING WALLS HAVING A PROFILE DESCRIBED ESSENTIALLY BY THE EQUATION
Claim 2
Dependent Claim
70 words
IN A METHOD OF SPINING FIBERS FROM FIBER-FORMING, LIQUID POLYMERIC MATERIAL UTILIZING A SPINNERET FOR EXTRUDING SAID MATERIAL THROUGH AT LEAST ONE CONVERGING NOZZLE PASSAGEWAY HAVING AN ENTRY OPENING AND AN EXIST ORIFICE, THE IMPROVEMENT COMPRISING ESTABLISHING AN ESSENTIALLY CONSTANT EXTENSIONAL STRAIN RATE CONDITION FOR FLOW OF SAID LIQUID THROUGH SAID PASSAGEWAY BY PROVIDING A NOZLE PASSAGEWAY BOUNDED BY GRADUALLY CURVING WALLS HAVING A PROFILE DESCRIBED ESSENTIALLY BY THE EQUATION
Claim 3
Dependent Claim
34 words
The method according to claim 1 wherein said profile is defined by a surface of revolution defined by a generatrix described by said equation and moving about said axis in a generally circular path.
Claim 4
Dependent Claim
48 words
The method according to claim 2 wherein the constant A in said equation is defined by -2 tan theta /R3 where theta is the conical half angle of an equivalent frustoconical passageway for establishing a maximum extensional strain rate essentially equal to said essentially constant extensional strain rate.
Claim 5
Dependent Claim
45 words
A solution spinning method according to claim 3 wherein said liquid material consists essentially of cellulose acetate and wherein said material is extruded at spinning speeds in the range of about 500 to 1500 meters per minute at spinning temperatures of about 50* to 110*C.
Claim 6
Dependent Claim
43 words
A melt spinning method according to claim 3 wherein said liquid material consists essentially of polyethylene terephthalate and wherein said material is extruded at spinning speeds in the range 500 to 6000 meters per minute at spinning temperatures of about 275* to 330*C.
Claim 7
Dependent Claim
21 words
The method according to claim 1 wherein said passageway is contiguous with and tangent to the walls of a frusto-conical passageway.
Claim 8
Dependent Claim
13 words
The method according to claim 1 wherein said liquid material comprises polyethylene terephthalate.
Claim 9
Dependent Claim
13 words
The method according to claim 1 wherein said liquid material comprises cellulose acetate.
Claim 10
Dependent Claim
13 words
The method according to claim 1 wherein said liquid material comprises cellulose triacetate.
Claim 11
Dependent Claim
27 words
A solution spinning method according to claim 1 wherein said material is extruded at spinning speeds in the range of about 500 to 1500 meters per minute.
Claim 12
Dependent Claim
27 words
A melt spinning method according to claim 1 wherein said material is extruded at spinning speeds in the range of about 500 to 3000 meters per minute.
Claim 13
Dependent Claim
21 words
A solution spinning method according to claim 1 wherein the spinning temperature is in the range of about 50* to 110*C.
Claim 14
Dependent Claim
21 words
A melt spinning method according to claim 1 wherein the spinning temperature is in the range of about 275* to 330*C.
References Cited (Backward Citations)
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Cited
US2341555A
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US2742667A
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US3006026A
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US3210451A
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US3608041A
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US3382535A
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |