US3832435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of crimped fibers and filaments of linear high molecular weight polymers
Assignee: Hoechst AG
•
Filing: 1971-06-30
•
Granted: 1974-08-27
•
Expires: 1991-06-30
Abstract
Abstract Fibers and filaments of linear high molecular weight polyesters and copolyesters having a latent three-dimensional crimp are produced by passing the spun filaments after their exit from the spinneret, over a rotating cooled cylinder at a temperature at which they do no longer stick on to the cylinder but are not fully cooled down. The cylinder has a temperature in the range of from 15* to 90*C and rotates at a circumferential speed U of from Vf/50 to Vf-Vf/90, Vf being the draw off speed of the filaments. The filaments are in contact with a surface section of the cylinder the length of which is determined by a contact angle of 10* to 150*.
Inventors
- 👤 G Bauer
- 👤 L Kramer
- 👤 H Kuhn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:14
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01D5/23
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
The process of claim 1, wherein the polyester is polyethylene terephthalate.
Claim 2
Dependent Claim
20 words
The process of claim 1, wherEin the cooled cylindrical zone rotates at a circumferential speed U Vf/10 to U 6Vf/10
Claim 3
Dependent Claim
31 words
The process of claim 1, wherein the contact angle determing the length of the filaments in contact with the cooled cylindrical zone is in the range of from 30* to 115*.
Claim 4
Dependent Claim
14 words
The process of claim 1, wherein the polyester has a specific viscosity above 0.5.
Claim 5
Dependent Claim
14 words
The process of claim 1, wherein the polyester has a specific viscosity above 0.8.
Claim 6
Dependent Claim
20 words
A process as set forth in claim 1 wherein the circumferential speed U ranges approximately from 200 to 340 m/min.
References Cited (Backward Citations)
US2799896A
Cited
GB809273A
Cited
US2934400A
Cited
US2990236A
Cited
US3317980A
Cited
US3629386A
Cited
US3436797A
Cited
US3458890A
Cited
US3499953A
Cited
US3480709A
Cited
US3520766A
Cited
GB1189393A
Cited
US3511905A
Cited
US3547891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |