High stiffness nonwoven filter medium

Details High stiffness nonwoven filter medium High stiffness nonwoven filter medium

1995-10-20

1998-01-20

Smith, Duane S.

Gas separation: apparatus

Electric field separation apparatus

Electric charge produced by friction

55521, 55527, 55528, 55DIG5, 55DIG39, 210505, 4283044, 42831111, 42831151, B01D 3908, B01D 4652

Patent

active

057097356

ABSTRACT:
A filter medium having high stiffness is provided. The filter is a nonwoven web of conjugate fibers which has a Frazier permeability above 200 CFM, an NaCl efficiency above 75 percent, a Gurley Stiffness above 700 mg, and a SEP value of above 80. The conjugate fibers may be polyolefin, more particularly polypropylene and polyethylene in a side-by-side configuration. The medium may be made into a filter by conventional means such as pleating. Such filters are useful in HVAC systems and transportation cabin air filtration.

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