Microporous polyolefinic hollow fiber and upward...

Details Microporous polyolefinic hollow fiber and upward... Microporous polyolefinic hollow fiber and upward...

D - Textiles, Paper

01

D

18/15, 18/615

D01D 5/247 (2006.01) B01D 67/00 (2006.01) B01D 69/08 (2006.01) D01D 5/24 (2006.01)

Patent

CA 1215505

ABSTRACT OF THE DISCLOSURE 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, spin-orienting the precursor by drawing at a defined drawdown ratio while quenching with a substantially symmetrical flow of quenching medium, stretching the precursor fiber, and then heat setting the stretched fiber. Quenching may be achieved using a hollow annular quench device which surrounds the precursor fiber and which has one or more openings on its inner surface to distribute the quenching medium (e.g., gas) against the precursor in a substantially uniform manner.

421858

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