Unidirectional fluid flow membrane

Details Unidirectional fluid flow membrane Unidirectional fluid flow membrane

B - Operations, Transporting

01

D

18/32, 137/1.5,

B01D 19/00 (2006.01) B63C 11/12 (2006.01) B63C 11/22 (2006.01)

Patent

CA 1110511

ABSTRACT OF THE DISCLOSE: An unidirectional fluid flow membrane in the form of a sheet of porous plastics material comprising a multitude of interconnected pores that together define passages suitable to allow a gas such as air to flow. The sheet of plastics material has one face heat-treated to partially close the passages to an extent sufficient to prevent a liquid such as water from flowing across the sheet toward the other face, whereby this sheet acts as a check-valve with respect to the liquid only. Owing to its unidirectional structure, this mem- brane can advantageously be used as overpressure valve in a life- or sea- jacket or as purge valve or exhaust diaphragm in an underwater mask, snorkel or regulator.

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