Pleated filtration assembly comprising spunbonded prefilter
Assignee3M Innovative Properties Company
InventorsHimanshu Jasuja, Nathan E. Schultz, Seth M. Kirk, Bryan L. Gerhardt, Daniel C. Duan, Michael R. Berrigan
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Abstract
A pleated multilayer air filter assembly including a primary filtration layer and a prefilter layer that are bonded to each other and are co-pleated with each other. The primary filtration layer includes meltblown electret fibers. The prefilter layer includes meltspun, spunbonded electret fibers that comprise a radially outer surface comprising polymethylpentene. The ratio of Effective Fiber Diameter of the fibers of the primary filtration layer to Effective Fiber Diameter of the fibers of the primary filtration layer is at least 1.5.
Claims16
A pleated multilayer air filter assembly comprising a primary filtration layer and a prefilter layer that are bonded to each other and are co-pleated with each other,
- wherein the primary filtration layer comprises meltblown electret fibers,
- wherein the prefilter layer comprises meltspun, spunbonded electret fibers that comprise a radially outer surface comprising polymethylpentene with at least 95% of the meltspun, spunbonded electret fibers of the prefilter layer being bicomponent sheath-core fibers with a sheath of polymethylpentene and with a core of polypropylene,
- and,
- wherein a ratio of an Effective Fiber Diameter of the meltspun, spunbonded electret fibers of the prefilter layer to an Effective Fiber Diameter of the meltblown electret fibers of the primary filtration layer is at least 1.5.
Dependencies are inferred from the claim text.