Method for forming a membrane into a predetermined shape

Details Method for forming a membrane into a predetermined shape Method for forming a membrane into a predetermined shape

1996-09-19

1997-10-28

Fortuna, Ana

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2104931, 2104934, 156202, 156228, 1563099, 156582, B01D 3900

Patent

active

056814674

ABSTRACT:
A thin film membrane formed to a predetermined shape is produced by bending the membrane to create a loop and softening the membrane that makes up the loop with either thermal energy or a swelling solvent. The softened loop is then drawn between plates or about a mandrel to form a membrane with a predetermined fold radius. The fold region produced by the method of the instant invention does not require an adhesive sealant to prevent unfiltered liquid from diffusing through the membrane. The method is especially well suited for preparing membranes for use in the production of spiral wound filters.

REFERENCES:
patent: 4252591 (1981-02-01), Rosenberg
patent: 4277344 (1981-07-01), Cadotte
patent: 4707265 (1987-11-01), Barnes, Sr. et al.
patent: 4842736 (1989-06-01), Bray et al.
patent: 4928334 (1990-05-01), Kita
patent: 5338382 (1994-08-01), Johnson et al.

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