Continuous process for making coated composite hollow fiber memb

Details Continuous process for making coated composite hollow fiber memb Continuous process for making coated composite hollow fiber memb

1988-02-23

1989-09-05

Lawrence, Evan

Coating processes

With stretching or tensioning

Running lengths

427177, 427245, 427358, 427378, 427379, 4273935, 4274121, 4274347, B05D 302, B05D 312, B05D 500, B05D 118

Patent

active

048637610

ABSTRACT:
The present invention is a process for applying a semi-permeable coating on a hollow fiber substrate. The hollow fiber substrate is continuously passed through a polymeric coating solution and withdrawn from the solution through a coating die to form a uniform polymeric solution coating on the outer surface of the hollow fiber. The coated hollow fiber is dried by passing it through a convective flow tunnel in which the rate of drying is controlled both by a pre-determined temperature profile in the tunnel and by a controlled air flow rate through the tunnel. The resultant material is a semi-permeable, coated composite hollow fiber membrane which can be used in gas and/or liquid separations.

REFERENCES:
patent: 4214020 (1980-07-01), Ward et al.
patent: 4230463 (1980-10-01), Henis et al.
patent: 4444662 (1984-04-01), Conover
patent: 4467001 (1984-08-01), Coplan et al.
patent: 4579079 (1986-04-01), Nundy

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