Method of manufacturing a unit assembly of filter membranes, a mold used in the method, and a product obtained from the method
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United States of America Patent
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Apr 9, 1991
Grant Date -
N/A
app pub date -
Dec 11, 1989
filing date -
Dec 23, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of manufacturing a unit assembly of filter membranes obtained by precipitating a polymer solution, comprises the following steps: a plurality of elongate porous elements are placed in an outer shell having a closed end and an open end, the elongate elements passing through said closed end and having longitudinal axes which are parallel to one another and to the direction extending between the two ends; injecting the polymer solution around the porous elements; injecting a fluid into one end of the elements, the fluid diffusing through the elements towards the polymer; and removing the polymer solvent which diffuses in the opposite direction from the other ends of the elements, thereby causing the polymer to precipitate and form a porous polymer structure around the porous elements and between them, with the porous structure having in contact with the porous elements a skin of adjustable porosity then removing the porous elements in order to unmold a porous polymer block pierced by channels whose longitudinal axes are parallel to one another. The invention also provides the resulting unit filter assembly, and mold for use in manufacturing it.
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