Process for preparation of porous hollow filament

Details Process for preparation of porous hollow filament Process for preparation of porous hollow filament

1988-09-28

1990-04-03

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264102, 2642091, 264187, 264203, 26421111, 26421116, 26421122, 26421123, 264349, 21050030, 21050031, D01D 5247, D01F 224

Patent

active

049138642

ABSTRACT:
A process for the preparation of a porous hollow filament composed mainly of an organic polymer, which comprises separately feeding a powder of the organic polymer and a liquid additive to a feed zone of twin-screw extruder, mixing the polymer with the additive in a kneading zone of the extruder to form a substantially liquid mixture, further kneading and compressing the liquid in a kneading and compressing zone of the extruder, feeding the liquid to an extruding zone of the extruder, and extruding the liquid from the extruding zone.

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