US4359441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric filaments and process for forming such material
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-08-24
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Granted: 1982-11-16
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Expires: 1999-08-24
Abstract
Abstract Process and apparatus for modifying melt spun filaments after extrusion and solidification by tensioning and exposing to a heated fluid environment. By this invention it is possible to directly form a melt spinnable filamentary yarn having properties similar to those of drawn yarns.
Inventors
- 👤 Ivan Barker
- 👤 Geoffrey Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:53
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
A process for forming polyethylene terephthalate filamentary material comprising: (a) extruding the polyethylene terephthalate while molten to form filaments; (b) advancing the molten filaments through a solidification zone; (c) advancing the solidified filaments through a tensioning zone comprising one or more non-rotatable filament contact guides without inducing substantial drawing thereof within the zone; (d) advancing the solidified filaments through a subsequent treatment zone into which fluid heated to a temperature above the glass-transition temperature of the filaments is introduced into the treatment zone at a point close to the entry point of the filaments into the zone; (e) withdrawing the filaments from the treatment zone at a velocity of from 1000 to 6000 meters/minute.
Claim 2
Dependent Claim
114 words
A process for forming polyethylene terephthalate filamentary material comprising: (a) extruding the polyethylene terephthalate while molten to form filaments; (b) advancing the molten filaments through a solidification zone; (c) advancing the solidified filaments through a tensioning zone comprising one or more non-rotatable filament contact guides without inducing substantial drawing thereof within the zone; (d) advancing the solidified filaments through a subsequent treatment zone into which fluid heated to a temperature above the glass-transition temperature of the filaments is introduced into the treatment zone at a point close to the entry point of the filaments into the zone; (e) withdrawing the filaments from the treatment zone at a velocity of from 1000 to 6000 meters/minute.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1 wherein polymeric material is extruded at the rate of 20-38 kilograms/hour.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 wherein the advancing molten filaments are solidified by cooling to a temperature below their crystalline melting point.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 wherein the advancing molten filaments are solidified by cooling to a temperature below their softening point.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 1 wherein the advancing molten filaments are solidified by cooling to a temperature below their glass-rubber transition temperature.
Claim 7
Dependent Claim
26 words
A process as claimed in claim 1 wherein the tension in the tensioning zone is insufficient to induce any drawing of the filaments within the zone.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 1 wherein the fluid is introduced into the treatment zone within a distance of 25% of the total length of the zone below the filament entry point.
Claim 9
Dependent Claim
32 words
A process as claimed in claim 7 wherein the fluid is introduced into the treatment zone within a distance of 10%of the total length of the zone below the filament entry point.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 1 wherein the fluid introduced into the treatment zone is air.
Claim 11
Dependent Claim
27 words
A process as claimed in claim 9 wherein the air is heated to a temperature of between the glass-rubber transition temperature of the filaments and 300° C.
Claim 12
Dependent Claim
28 words
A process as claimed in claim 9 wherein the air is heated to a temperature of between the glass-rubber transition temperature of the filaments and their melting point.
References Cited (Backward Citations)
SU294874A1
Cited
JPS4828012A
Cited
US4000238A
Cited
US3946100A
Cited
US4195161A
Cited
US3994121A
Cited
JPS5143424A
Cited
JPS5160728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |