Claims
- 1. A filament having crimp comprising alternating S-twisted and Z-twisted helically coiled regions connected by twist reversal regions, said filament having a cross-section comprising a spiral wherein the outer portion of said spiral lies at the inside of the coils of said helically coiled regions and having a crimp of at least 8%.
- 2. The filament defined in claim 1, wherein said spiral cross-section is closed at its inner end.
- 3. The filament defined in claim 1, wherein said spiral cross-section is open at its inner end.
- 4. The filament defined in claim 1, wherein said filament has a denier of between about 1.5 and 20.
- 5. The filament defined in claim 1, wherein said filament is formed from polyester.
- 6. The filament defined in claim 1, wherein said spiral extends over more than 360 degrees.
- 7. The filament defined in claim 1, wherein said filament has a crimp of at least 12%.
Parent Case Info
This is a division, of application Ser. No. 778,913 filed Mar. 28, 1977, now U.S. Pat. No. 4,176,150.
US Referenced Citations (3)
Foreign Referenced Citations (3)
Number |
Date |
Country |
49660 |
Aug 1966 |
DEX |
853062 |
Nov 1960 |
GBX |
891464 |
Mar 1962 |
GBX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
778913 |
Mar 1977 |
|