Poly(trimethylene terephthalate) multifilament yarn
US6572967B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2002 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Mar 22, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2969
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides a yarn suitable for stretch clothing, which yarn is a polytrimethylene terephthalte multifilamentary yarn having an intrinsic viscosity in a range from 0.7 to 1.1 dl/g, a single-filament size in a range from 3.3 to 8.9 dtex, an elongation at break in a range from 36 to 60% and the fluctuation value of yarn size (U %) is 1.2% or less and a false-twist textured yarn thereof. The multifilamentary yarn is produced under the conditions in that a distance between the adjacent spinning orifices is 5 mm or more, a spinning temperature is in a range from 255 to 275° C., a surface temperature of a spinneret is 255° C. or higher, and a product of a discharge linear speed V of molten polymer and the intrinsic viscosity [&eegr;] is in a range from 5 to 12 (m/min)(dl/g). Since the contamination on the periphery of the spinning orifice generating during the melt-spinning is minimized according to this production method, the wiping period can be prolonged which is extremely advantageous in the industrial sense.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.