US4009511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drawing polyamide monofilaments
Assignee: EIDP Inc
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Filing: 1975-12-15
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Granted: 1977-03-01
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Expires: 1995-12-15
Abstract
Abstract Heavy denier, polyamide monofils are produced by the coupled steps of spinning, quenching, drawing and winding. Quenching involves passage of the filament through an air gap and a water bath. There are two stages of drawing. In the first stage, pressurized steam is used to deorient surface polymer and as a draw assist.
Inventors
- 👤 Sibbley Paul Gauntt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:53
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/228; D01; D01D; D01D5/00; D01D5/12; D01D5/16; D01F; D01F6/00; D01F6/58; D01F6/60; D02J1/222
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
In a process including the coupled steps of spinning, quenching and drawing a heavy denier, aliphatic polyamide monofilament in first and second draw stages to a total draw ratio of at least 5.5×, the improvement comprising: water-quenching the monofilament, advancing the quenched monofilament, in said first draw stage through a pressurized, surface-plasticizing, steam atmosphere wherein it is orientation-stretched at a ratio of at least 3.5×, and then advancing the monofilament, in said second draw stage through a zone heated with a radiant heater at a temperature of 700° C.-1300° C. wherein it is orientation-stretched at a ratio of at least 1.3×.
Claim 2
Dependent Claim
101 words
In a process including the coupled steps of spinning, quenching and drawing a heavy denier, aliphatic polyamide monofilament in first and second draw stages to a total draw ratio of at least 5.5×, the improvement comprising: water-quenching the monofilament, advancing the quenched monofilament, in said first draw stage through a pressurized, surface-plasticizing, steam atmosphere wherein it is orientation-stretched at a ratio of at least 3.5×, and then advancing the monofilament, in said second draw stage through a zone heated with a radiant heater at a temperature of 700° C.-1300° C. wherein it is orientation-stretched at a ratio of at least 1.3×.
Claim 3
Dependent Claim
31 words
The process of claim 1, wherein the temperature of the quenching water is less than 50° C. and steam pressure in said first stage is in the range of 50-170 psig.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the steam penetrates the monofilament to a depth of less than about 15 microns.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the steam in the first draw stage is superheated steam.
Claim 6
Dependent Claim
42 words
The process of claim 1 wherein the monofilament is drawn at a draw ratio of at least 3.7× and at a steam pressure of at least 50 psig with an exposure time of less than 1 second in the first draw stage.
Claim 7
Dependent Claim
32 words
The process of claim 5 wherein the monofilament is drawn at a total draw ratio such that the polymer in the core of the monofilament has a refractive index greater than 1.57.
Claim 8
Dependent Claim
33 words
The process of claim 1 wherein 6--6 nylon is drawn at a steam pressure of 80-170 psig and steam quality of 40% wet to 120° F. of superheat in the first draw stage.
Claim 9
Dependent Claim
26 words
The process of claim 7 wherein the polyamide is 6--6 nylon and the surface temperature of the monofilament in the second draw stage is 180°-250° C.
Claim 10
Dependent Claim
26 words
The process of claim 7 wherein the polyamide is 6 nylon and the surface temperature of the monofilament in the second draw stage is 150°-220° C.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |