FILTER ASSEMBLY, PREFILTER ASSEMBLY, AND RESPIRATOR INCLUDING THE SAME

A filter assembly comprises an air filter medium and a prefilter medium. The prefilter medium comprises a second nonwoven fibrous web comprising poly(4-methylpentene) and an electrostatic charging additive and has a second electret charge. The filter assembly is configured such that air passing thro...

Full description

Saved in:
Bibliographic Details
Main Authors SCHULTZ, Nathan E, SEBASTIAN, John M, KIRK, Seth M, LI, Fuming B, DUAN, Daniel C, BECKER, Zackary J, BERRIGAN, Michael R
Format Patent
LanguageEnglish
French
German
Published 04.05.2022
Subjects
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
Online AccessGet full text

Cover

More Information
Summary:A filter assembly comprises an air filter medium and a prefilter medium. The prefilter medium comprises a second nonwoven fibrous web comprising poly(4-methylpentene) and an electrostatic charging additive and has a second electret charge. The filter assembly is configured such that air passing through the prefilter is directed through the air filter medium. A respirator includes the filter assembly. A prefilter assembly comprises a third nonwoven fibrous web retained by a prefilter frame. The third nonwoven fibrous web comprises: core-sheath fiber comprising a fiber core having a poly(4-methylpentene) sheath layer disposed thereon; and an electrostatic charging additive, wherein the electrostatic charging additive is contained in at least one of the fiber core or the sheath layer. The third nonwoven fibrous web has a third electret charge.
Bibliography:Application Number: EP20200743254