Method for preparing a uniform polyolefinic microporous hollow fiber
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United States of America Patent
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Sep 17, 1985
Issued Date -
N/A
app pub date -
Jun 13, 1983
filing date -
Feb 18, 1982
priority date (Note) -
Expired
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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.
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