Method for preparing a uniform polyolefinic microporous hollow f

Details Method for preparing a uniform polyolefinic microporous hollow f Method for preparing a uniform polyolefinic microporous hollow f

1983-06-13

1985-09-17

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264176F, B29D 2304

Patent

active

045419817

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.

REFERENCES:
patent: 4055696 (1977-10-01), Kamada et al.
patent: 4159297 (1979-06-01), Mackie et al.
patent: 4399084 (1983-08-01), Sagawa et al.
patent: 4401567 (1983-08-01), Shendo et al.

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