US4038357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of synthetic filaments
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1975-07-10
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Granted: 1977-07-26
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Expires: 1995-07-10
Abstract
Abstract The present invention provides a method for the manufacture of potentially crimpable, synthetic linear polymer filaments which comprises the steps of melt spinning a plurality of filaments, initially partially cooling the hot filaments evenly with a stream of gas, and asymmetrically cooling the filaments further by causing them to contact continuously renewed thin film of liquid.
Inventors
- 👤 Bryan Boyes
- 👤 Alan Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:22
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01D5/23
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
A method for the manufacture of potentially crimpable, synthetic linear polymer filaments which comprises the steps of (A) melt spinning a plurality of filaments, (B) initially partially cooling the hot filaments evenly with a stream of radial outflowing quence gas over a distance commencing from the spinneret and extending 3 to 10 inches below it, and (C) asymmetrically cooling the filaments further by causing them to contact a continuously renewed thin film of liquid less than the thickness of the filaments which liquid is at a temperature effectively below that of the filaments after step (B), the filaments contacting the film of cooler liquid in such manner that one side only of each filament contacts the film of liquid.
Claim 2
Independent Claim
119 words
A method for the manufacture of potentially crimpable, synthetic linear polymer filaments which comprises the steps of (A) melt spinning a plurality of filaments, (B) initially partially cooling the hot filaments evenly with a stream of radial outflowing quence gas over a distance commencing from the spinneret and extending 3 to 10 inches below it, and (C) asymmetrically cooling the filaments further by causing them to contact a continuously renewed thin film of liquid less than the thickness of the filaments which liquid is at a temperature effectively below that of the filaments after step (B), the filaments contacting the film of cooler liquid in such manner that one side only of each filament contacts the film of liquid.
Claim 3
Dependent Claim
32 words
A method according to claim 1, wherein the crimpability of the filaments is varied and controlled by adjusting the cooling effects of the gas stream and the liquid relative to each other.
Claim 4
Dependent Claim
43 words
A method according to claim 1, wherein coarse selection of the desired crimpability is controlled by the application of the cooling liquid to the filaments, and adjustment of the initial cooling conditions by the gas provides a fine control of the desired crimpability.
Claim 5
Dependent Claim
38 words
A method according to claim 1 wherein the filaments are initially cooled by a stream of gas which is directed radially outwards from a region substantially in the centre of the array of filaments issuing from a spinneret.
Claim 6
Dependent Claim
33 words
A method according to claim 4, wherein the filaments in the array are maintained separate during their contact with the film of cooling liquid which is being applied thereto in a controlled manner.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein the film of cooling liquid is being continuously renewed on the surface of a suitably shaped body.
Claim 8
Dependent Claim
55 words
A method according to claim 7, wherein the surface covered by the cooling liquid is preferably the outer surface of a porous or perforated wall of a suitably shaped hollow body into the interior of which the liquid is fed so that it passes through the porous or perforated wall to the exterior surface thereof.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the quench gas is used in an amount of 7 to 70 cubic feet per minute.
Claim 10
Dependent Claim
36 words
The method of claim 1 wherein the frequency in amplitude of the crimp is controlled by interdependently adjusting the cooling effect of steps (B) and (C) to yield a desired potential crimp in the quenched filaments.
Claim 11
Dependent Claim
31 words
The method of claim 8 wherein the volume of quench gas is adjusted to give the degree of crimp frequency and amplitude based on the spinning speed and air cooling distance.
References Cited (Backward Citations)
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US3629386A
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US3480709A
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US3511905A
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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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |