US3685276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of moderately elastic crimp yarns
Assignee: Bayer AG
•
Filing: 1970-07-28
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Granted: 1972-08-22
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Expires: 1990-07-28
Abstract
Abstract A process for the continuous production of moderately elastic crimp yarn from unstretched synthetic filaments by false-twist crimping, wherein the unstretched synthetic filaments are initially fully stretched under heat with a slight false-twist, after which they are subjected in the same operation to falsetwist crimping under heat in the opposite direction and wound up under relaxation. Stretching is carried out at stretching ratios of from 1:3 to 1:6 and at temperatures of from 80* to 180* C.
Inventors
- 👤 Herbert Scherzberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:47
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/0226
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
A process for the continuous production of crimp yarn from synthetic filaments wherein the synthetic filaments are: I. fully stretched under heating at temperatures of above 80* C with a false-twist of below 2,000 false twist per meter; II. subjected without further stretching in the same working stage to false-twist crimping under heat at temperatures of above 120* C in the opposite direction; and III. wound up under relaxation.
Claim 2
Dependent Claim
69 words
A process for the continuous production of crimp yarn from synthetic filaments wherein the synthetic filaments are: I. fully stretched under heating at temperatures of above 80* C with a false-twist of below 2,000 false twist per meter; II. subjected without further stretching in the same working stage to false-twist crimping under heat at temperatures of above 120* C in the opposite direction; and III. wound up under relaxation.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1, wherein stretching is carried out at a stretching ratio of from 1:3 to 1:6.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the stretching is carried out at a temperature of from 80* to 180* C.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1, wherein the degree of twisting in stage (1) is from 1,000 to 2,000 false-twists per meter.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1, wherein the degree of twisting in stage (II) is from 1,500 to 3,000 false-twiste per meter.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1, wherein the synthetic filaments are filaments of a high molecular weight polyamide.
Claim 8
Dependent Claim
20 words
A process as claimed in claim 1, wherein the synthetic filaments are filaments of a high molecular weight linear polyester.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |