US3947538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for uniformily drawing a tow of filaments
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1971-09-29
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Granted: 1976-03-30
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Expires: 1991-09-29
Abstract
Abstract Uniformly drawing tows of synthetic linear thermoplastic polymer filaments between sets of feed rolls and draw rolls by saturating a tow while on the feed rolls with water at a temperature of Tg +/- 10 DEG C and ensuring that drawing is substantially complete before the tow leaves the last feed roll.
Inventors
- 👤 Geoffrey Marshall
- 👤 Eric Ivan Riseley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/224
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A process for uniformly drawing a tow of filaments of a synthetic linear thermoplastic polymer having a second order transition temperature (Tg) as hereinafter defined of at least 35°C comprising passing a tow at least partly around the peripheries of a plurality of feed rolls in series and subsequently around a plurality of draw rolls in series the latter rotating at a higher peripheral speed, characterized in that substantially undrawn tow is initially passed to said feed rolls, spraying said tow while in contact with more than one of said feed rolls with a saturating amount of heated water at a temperature in the range Tg ± 10°C and drawing said tow to substantially the desired extent at said temperature before the tow leaves the last feed roll.
Claim 2
Dependent Claim
128 words
A process for uniformly drawing a tow of filaments of a synthetic linear thermoplastic polymer having a second order transition temperature (Tg) as hereinafter defined of at least 35°C comprising passing a tow at least partly around the peripheries of a plurality of feed rolls in series and subsequently around a plurality of draw rolls in series the latter rotating at a higher peripheral speed, characterized in that substantially undrawn tow is initially passed to said feed rolls, spraying said tow while in contact with more than one of said feed rolls with a saturating amount of heated water at a temperature in the range Tg ± 10°C and drawing said tow to substantially the desired extent at said temperature before the tow leaves the last feed roll.
Claim 3
Dependent Claim
22 words
A process according to claim 1 wherein the tow comprises polyester filaments which are sprayed with water at a temmperature of 60°-80°C.
Claim 4
Dependent Claim
12 words
A process according to claim 2 wherein the filaments comprise polyethylene terephthalate.
Claim 5
Dependent Claim
16 words
A process according to claim 1 wherein heated water is applied to all the feed rolls.
Claim 6
Dependent Claim
37 words
A process according to claim 1 wherein the water is applied to less than all the feed rolls by means of sprays directed at the tow on a succession of feed rolls including the last feed roll.
Claim 7
Dependent Claim
34 words
A process according to claim 1 wherein the tow tension within the feed roll system is controlled by a resilient surfaced nip roll applied to the tow on at least the first feed roll.
Claim 8
Dependent Claim
31 words
A process according to claim 1 wherein the drawn tow is heat treated at a temperature at least equal to the drawing temperature while it is held at substantially constant length.
Claim 9
Dependent Claim
22 words
A process according to claim 7 wherein the heat treatment is applied by heating means placed between the feed and draw rolls.
Claim 10
Dependent Claim
14 words
A process according to claim 8 wherein the heating means is a steam chest.
Claim 11
Dependent Claim
22 words
A process according to claim 9 wherein a steam jet which impinges on the tow is placed immediately before the steam chest.
Claim 12
Dependent Claim
21 words
A process according to claim 8 wherein the heat treatment is provided by heating at least some of the draw rolls.
Claim 13
Dependent Claim
26 words
A process according to claim 7 wherein the heat treated tow is further heat treated at a temperature higher than that of the first heat treatment.
References Cited (Backward Citations)
GB758398A
Cited
US2918346A
Cited
US3259681A
Cited
US3414645A
Cited
US3221088A
Cited
US3423501A
Cited
US3564835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |