Producing foamed fibers
US4562022A · kind A · utility
25Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1983 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Apr 29, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/05
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A molten polymer containing a blowing agent and, usually, a nucleating agent, is spun into fibers with screen packs or equivalent structures upstream of the spinning apertures. The use of screen packs enables the production of fibers with finer bubbles, which are therefore susceptable to greater melt-drawdown and postdrawing and can have better tensile properties. Foamed polyamide fibers are produced with average bubble diameters one-twentieth or less, compared to the effective fiber diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.