Filtration media for liquid filtration
AssigneeE. I. Du Pont de Nemours and Company
InventorsW. Douglas Bates, III, Henricus Jacobus Cornelis Gommeren, Hageun Suh
Life of this patent
Estimating the term…
Abstract
Filtration media including at least one layer of nanofibers having average diameters less than 1000 nanometers with optional scrim layer(s) are disclosed for filtering particulate matter in liquid. The media achieve flow rates of at least 0.055 L/min/cm2 at relatively high levels of solidity. The media have also advantageously been found to have non-diminishing flow rates as differential pressures increase between 2 psi (14 kPa) and 15 psi (100 kPa).
Claims14
A filtration medium comprising at least one nanofiber layer of polymeric nanofibers wherein the nanofibers have average fiber diameters of less than about 1 μm and the nanofiber layer has a mean flow pore size of between about 0.5 μm and about 5.0 μm, a solidity of between 70.1 vol % and 87.3 vol % and a liquid flow rate through the medium of at least about 0.055 L/min/cm2 of water at 10 psi (69 kPa) differential pressure.
A filter comprising a filtration medium having at least one nanofiber layer of polymeric nanofibers wherein the nanofibers have average fiber diameters of less than about 1 μm and the nanofiber layer has a mean flow pore size of between about 0.5 μm and about 5.0 μm, a solidity of between 70.1 vol % and 87.3 vol % and a liquid flow rate through the medium of at least about 0.055 L/min/cm2 of water at 10 psi (69 kPa) differential pressure.
A method of removing particulates from a liquid comprising passing the liquid containing particulates through a filtration medium comprising at least one nanofiber layer of polymeric nanofibers wherein the nanofibers have average fiber diameters of less than about 1 μm and the nanofiber layer has a mean flow pore size of between about 0.5 μm and about 5.0 μm, a solidity of between 70.1 vol % and 87.3 vol % and a liquid flow rate through the medium of at least about 0.055 L/min/cm2 of water at 10 psi (69 kPa) differential pressure.
Dependencies are inferred from the claim text.