US4254076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt-spinning acrylonitrile polymer fiber using spinnerette plate with multiple capillaries per counterbore
Assignee: Wyeth Holdings LLC
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Filing: 1979-06-20
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Granted: 1981-03-03
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Expires: 1999-06-20
Abstract
Abstract A spinnerette plate having multiple capillaries per counterbore can be effectively used to melt-spin fusion melts of acrylonitrile polymer and water without sticking together of individual filaments.
Inventors
- 👤 Ronald E. Pfeiffer
- 👤 Stanley E. Peacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:28
CPC Classifications
D; D01; D01D; D01D4/00; D01D4/02; D01F; D01F6/00; D01F6/02; D01F6/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A process for melt-spinning fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure which maintains water and said polymer in a single melt phase and extruding said fusion melt through a spinnerette plate having a plurality of counterbores and within each counterbore, at least about 3 capillaries, said capillaries having a density of at least about 18 per square centimeter of plate surface, said extrusion being directly into a steam-pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids deformation thereof.
Claim 2
Dependent Claim
114 words
A process for melt-spinning fiber which comprises providing a homogeneous fusion melt of a fiber-forming acrylonitrile polymer and water at a temperature above the boiling point of water at atmospheric pressure and at a temperature and pressure which maintains water and said polymer in a single melt phase and extruding said fusion melt through a spinnerette plate having a plurality of counterbores and within each counterbore, at least about 3 capillaries, said capillaries having a density of at least about 18 per square centimeter of plate surface, said extrusion being directly into a steam-pressurized solidification zone maintained under conditions such that the rate of release of water from the nascent extrudate avoids deformation thereof.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said extrudate is drawn while in said solidification zone.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein said drawing is done in at least two stages, the second stage being at a stretch ratio greater than the first.
Claim 5
Dependent Claim
13 words
The process of claim 2 wherein the drawn extrudate is relaxed in steam.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein the drawn extrudate is relaxed in steam.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |