Molded fibrous filtration products

Details Molded fibrous filtration products Molded fibrous filtration products

A - Human Necessities

62

B

183/109, 2/72.1

A62B 23/00 (2006.01) A41D 13/11 (2006.01) B01D 39/16 (2006.01) B32B 5/26 (2006.01) D04H 13/00 (2006.01)

Patent

CA 1252396

Abstract of the Disclosure Molded filtration products, such as disposable face masks, are prepared by assembling at least one fibrous shaping layer (14, 16)and one fibrous filtration layer (15) in face-to-face contact and subjecting the assembly to heat and molding pressure. Preferably the assembly comprises two shaping layers (14, 16), one on each side of the filtration layer (15). The shaping layers in total weigh no more than about 150 pounds per ream (250 grams per square meter) and contribute no more than about 20 percent of the total pressure drop through the filtration product. At least one of the shaping layers comprises fibers that can be bound together at points of fiber intersections by coalescence of binder material on the fibers.

474508

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