Poly(ethylene terephthalate) flat yarns and tows
US4156071A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1978 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Jun 5, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/298
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
New poly(ethylene terephthalate) flat yarns and tows having physical properties and dyeability more akin to cellulose acetate than to conventional poly(ethylene terephthalate) flat yarns are prepared directly by spinning at speeds of about 4000 meters/minute. Among the useful physical properties are a modulus of 30 to 65, which is relatively unaffected by boiling, low boil-off shrinkage, no need for heat setting, low shrinkage tension, large crystal size, and low amorphous orientation which is measured by a value termed "amorphous modulus." The flat yarns may be used, e.g. in textile fabrics, without drawing, and may be modified, e.g. by air-jet texturing. The tows may be converted into staple fiber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.