Patent ID: 6156680
Filing Date: 2000-12-05
Classification: B01D,D04H,D21H,Y10T

Abstract:
A nonwoven web comprising: 40 to 84 wt. % of polymeric staple fibers having a length in the range of 5 to 15 mm and a denier in the range of 0.2 to 3.0, said polymeric staple fibers having a melting temperature;16 to 60 wt. % of polymeric binder fibers comprising a first thermoplastic binder material having a first melting temperature less than said melting temperature of said polymeric staple fibers; anda second thermoplastic binder material having a second melting temperature less than said first melting temperature,wherein said polymeric staple fibers and said first and second thermoplastic binder fibers are substantially homogeneously mixed so that said polymeric staple fibers are bonded to form the nonwoven web by said first and second thermoplastic binder materials, and the nonwoven web has a permeability of 5 to 10 cfm, wherein said staple fibers comprise a first fraction of staple fibers having a denier greater than 0.2 but less than 1.0 and a second fraction of staple fibers having a denier greater than 1.0 but less than 3.0.