Fibrous web for processing a fluid

A method for preparing a melt-blown fibrous nonwoven web, comprising surface modifying a melt-blown fibrous non-woven web characterized by a 4 cm lateral flow time of about 225 seconds or less in a first direction to alter the critical wetting surface tension (CWST) of the web to between about 65 and about 100 dynes/cm so as to obtain a desired LFT.

A method for preparing a melt-blown fibrous nonwoven web, comprising modifying a melt-blown fibrous nonwoven web characterized by a 2 cm lateral flow time of about 40 seconds or less in a first direction to alter the voids volume of the web so as to obtain a desired LFT.

A method for preparing a melt-blown fibrous nonwoven web, comprising modifying a melt-blown fibrous nonwoven web characterized by a 4 cm lateral flow time of about 225 seconds or less in a first direction to alter the voids volume of the web so as to obtain a desired LFT.

A method for preparing a melt-blown fibrous nonwoven web, which method comprises preparing a melt-blown fibrous nonwoven web characterized by a 2 cm lateral flow time of about 40 seconds or less in a first direction with hydrophilic oriented fibers with an average fiber diameter in the range of about 1 to about 25 .mu.m so as to obtain a desired lateral flow time.

A method for preparing a melt-blown fibrous nonwoven web, which method comprises preparing a melt-blown fibrous nonwoven web characterized by a 4 cm lateral flow time of about 225 seconds or less in a first direction with hydrophilic oriented fibers with an average fiber diameter in the range of about 1 to about 25 .mu.m so as to obtain a desired lateral flow time.

A device for processing a biological fluid comprising a first melt-blown fibrous web, a second melt-blown fibrous web, and an isotropic, skinless, polyvinylidene fluoride membrane interposed between the first and second webs, said device allowing fluid communication between the first and second melt-blown fibrous webs and through the membrane, wherein at least the first melt-blown fibrous web comprises fibers such that 90% of said fibers have a diameter ranging from a minimum fiber diameter to a maximum fiber diameter which is no more than about three times the minimum fiber diameter, and wherein said first melt-blown fibrous web has a critical wetting surface tension (CWST) at least about 65 dynes/cm.

A melt-blown fibrous nonwoven web having a weight distribution varying by less than about 10% over a unit area wherein the web is substantially free of roping, twinning, and shot.

A melt-blown fibrous nonwoven web having a weight distribution varying by less than about 5% over a unit area, the web having a voids volume in the range of from about 60% to about 94% wherein the web is substantially free of roping, twinning, and shot.

A melt-blown fibrous nonwoven web having a weight distribution varying by less than about 10% over a unit area, wherein the web is substantially free of roping, twinning, and shot, wherein the web comprises a polymer selected from the group consisting of polybutylene terephthalate, polypropylene, polyethylene, polymethylpentene, polychlorotrifluoroethylene, polyphenyl sulfide, poly(1,4-cyclohexylene dimethylene terephthalate), PETG, a polyester polymerized with an excess of glycol, nylon 6 copolymer of 80% nylon 6 with 20% polyethylene-oxide-diamine.

A device comprising melt-blown fibrous nonwoven web having a weight distribution varying by less than about 10% over a unit area, wherein the web is substantially free of roping, twinning, and shot, disposed in a housing.

A method of processing a fluid comprising contacting a melt-blown fibrous nonwoven web with the fluid, the web having a weight distribution varying by less than about 10% over a unit area wherein the web substantially free of roping, twinning, and shot.