Method for preparing a uniform polyolefinic microporous hollow fiber
US4541981A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Jun 13, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D69/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides microporous hollow fiber with improved structural and performance characteristics and a process and apparatus for preparing the improved fiber. The microporous hollow fiber possesses substantially uniform wall thickness, cross-sectional dimensions and porosity. Such characteristics are obtained by melt spinning hollow fiber precursor under defined conditions in a substantially vertically upward direction and subjecting the precursor to a symmetrical quenching step which may be achieved using a hollow annular structure surrounding the precursor. The structure, which is connected to a source of gas, has one or more openings on its inner surface that distribute the gas against the precursor in a substantially uniform manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.