초록 ▼

A breathing mask fabric is provided which has between 50 and 95 weight percent of a through-air bonded, electret treated, nonwoven microfiber first web of fibers where the fibers have an average diameter of between about 10 and 25 microns and where the first web has a Frazier Permeability above abou

A breathing mask fabric is provided which has between 50 and 95 weight percent of a through-air bonded, electret treated, nonwoven microfiber first web of fibers where the fibers have an average diameter of between about 10 and 25 microns and where the first web has a Frazier Permeability above about 100 CFM/SF, a density of between about 0.015 and 0.15 gms/cc, and a basis weight between about 67 gsm and about 340 gsm, and between about 5 and 50 weight percent of an electret treated microfiber second web of fibers where the fibers have an average diameter of less than about 10 microns.

대표청구항 ▼

[ What is claimed is:] [1.] A breathing mask filter fabric laminate comprising:between about 50 and 95 weight percent of a through-air bonded, electret treated, nonwoven microfiber first web of generally continuous fibers wherein said fibers have an average diameter of between about 10 and 25 micron

[ What is claimed is:] [1.] A breathing mask filter fabric laminate comprising:between about 50 and 95 weight percent of a through-air bonded, electret treated, nonwoven microfiber first web of generally continuous fibers wherein said fibers have an average diameter of between about 10 and 25 microns and wherein said first web has a Frazier permeability above about 100 CFM/SF, a density of between about 0.015 and 0.15 gms/cc, and a basis weight up to about 340 gsm, andbetween about 5 and 50 weight percent of an electret treated microfiber second web of fibers wherein said fibers have an average diameter of less than about 10 microns.