High stiffness nonwoven filter medium

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 particul...

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Bibliographic Details
Main Authors MIDKIFF; DAVID GRANT, NEELY; JAMES RICHARD
Format Patent
LanguageEnglish
Published 20.01.1998
Edition6
Subjects
AIR-CONDITIONING, AIR-HUMIDIFICATION, VENTILATION, USE OF AIRCURRENTS FOR SCREENING
BLASTING
BRAIDING
COTTON-WOOL
FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS
HEATING
KNITTING
LACE-MAKING
LIGHTING
MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL
MECHANICAL ENGINEERING
NON-WOVEN FABRICS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
RANGES
SEPARATION
TEXTILES
TRANSPORTING
TRIMMINGS
VENTILATING
WADDING
WEAPONS
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Summary: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.
Bibliography:Application Number: US19950546007