US3905077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for crimping polyester filament yarn
Assignee: EIDP Inc
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Filing: 1974-05-31
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Granted: 1975-09-16
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Expires: 1994-05-31
Abstract
Abstract Textile filaments which have asymmetric shrinkage properties, and may be heat-relaxed to provide a high crimp frequency and a narrow crimp frequency distribution, are produced by meltspinning a single synthetic linear polymer composition, drawing the filaments and then passing them over an unheated wearresistant pin at high speed. The process condition are controlled to provide filaments of regular cross-sectional configuration having a modified minor portion, distinguishable from the remainder of the filament by a different refractive index, which extends substantially continuously along the filament.
Inventors
- 👤 Hans Rudolf Edward Frankfort
- 👤 Peter Francis Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:21
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02G; D02G1/00; D02G1/004
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
31 words
A process as defined in claim 1 wherein the drawn filaments are passed in frictional contact with the durable, wear-resistant surface at a speed of at least 900 yards per minute.
Claim 2
Dependent Claim
18 words
A process as defined in claim 2 wherein the filament speed is 1,000 to 4,500 yards per minute.
Claim 3
Dependent Claim
24 words
A process as defined in claim 3 wherein the durable, wear-resistant surface is provided by a cylindrical pin 3 to 10 millimeters in diameter.
Claim 4
Dependent Claim
20 words
A process as defined in claim 4 wherein the filaments contact the pin over an arc of 30* to 180*.
Claim 5
Dependent Claim
18 words
A process as defined in claim 2 wherein the filament speed is at least 2,000 yards per minute.
Claim 6
Dependent Claim
28 words
A process as defined in claim 1 wherein the filaments are drawn to have a boil-off shrinkage of 5 to 25 percent when determined prior to step (b).
Claim 7
Dependent Claim
28 words
A process as defined in claim 1 wherein the filaments are drawn to have 15 to 40 percent elongation at break and 8 to 16 percent boil-off shrinkage.
Claim 8
Dependent Claim
26 words
A process as defined in claim 1 wherein the drawn filaments are fed from step (a) to step (b) at a temperature of 25* to 100*C.
Claim 9
Dependent Claim
41 words
A process as defined in claim 1 wherein the tension on the filaments immediately after contact with the wear-resistant surface minus the tension immediately before the surface is 0.7 to 7 grams per filament for filaments of 1.5 to 10 denier.
Claim 10
Dependent Claim
26 words
A process as defined in claim 10 wherein said tension difference is 1 to 2 grams per filament and the filaments are composed of a polyester.
Claim 11
Dependent Claim
25 words
A process as defined in claim 1 wherein the filaments are in frictional contact with the surface for a distance of 0.5 to 15 millimeters.
Claim 12
Dependent Claim
25 words
A process as defined in claim 1 wherein the filaments are in frictional contact with the surface for a distance of 1 to 10 millimeters.
Claim 13
Dependent Claim
20 words
A process as defined in claim 1 wherein the temperature rise calculated by the following formula is 100* to 300*C.:
Claim 14
Dependent Claim
15 words
A process as defined in claim 1 wherein the wear-resistant surface is a curved surface.
Claim 15
Dependent Claim
18 words
A process as defined in claim 1 wherein the wear-resistant surface is the surface of a ceramic pin.
Claim 16
Dependent Claim
15 words
A process as defined in claim 1 wherein the filaments are composed of a polyamide.
Claim 17
Dependent Claim
33 words
A process as defined in claim 1 which is a coupled spin/draw/pin-texturing process wherein the yarn is drawn to have 15 to 40 percent break elongation and 8 to 16 percent boil-off shrinkage.
Claim 18
Dependent Claim
15 words
A process as defined in claim 1 wherein the filaments are composed of polyethylene terephthalate.
Claim 19
Dependent Claim
120 words
A process for treating multifilament yarn to impart asymmetric shrinkage properties to drawn yarn filaments of denier per filament (d) and consisting of a single synthetic linear polyester composition, which comprises passing the drawn filaments at a high speed (V) in frictional contact with an unheated ceramic pin for a frictional contact length (L) of 0.05 to 1.5 centimeters under tension conditions which apply a filament stretch of 2 to 5 percent, said pin having a coefficient of friction of 0.2 to 1.2 and said filaments having a temperature of 25* to 100*C. just prior to contact with the pin, the values of said variables being such that the temperature rise calculated by the following formula is at least 140*C.:
Claim 20
Dependent Claim
50 words
A process for treating the filaments of a multifilament yarn as defined in claim 20, wherein said yarn has been drawn to have an elongation of 15 to 40 percent and a boil-off shrinkage of 8 to 16 percent before the yarn filaments are passed in contact with said pin.
References Cited (Backward Citations)
US2974391A
Cited
US3226792A
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US3358345A
Cited
US3115744A
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US3379809A
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US3317978A
Cited
US3816992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |