Multilayer composite air filtration media
OwnerRick L. Chapmaninventor
Life of this patent
Estimating the term…
Abstract
A composite filter media is formed of a plurality of layers. A central layer of electrostatically charged material formed of a carded mixture of polyolefin fibers such as polypropylene and electro-negative substituted organic resin fibers such as modacrylic acrylonitrile-vinyl, chloridevinylidene chloride copolymer efficiently filter more than 99% of 0.1 to 0.5 micron particles. A flame retardant prefilter layer of polyester removes large particles and a backing of flame retardant linear polyester provides tear resistance. An optional layer of electrostatically charged, melt blown, polyolefin such as polypropylene prevents the central layer from loading up by effectively filtering intermediate sized particles.
Claims13
A composite air filter media comprising:
- a first, main layer of electrostatically charged, synthetic organic resin fibers capable of filtering more than 90% of 0.1 to 0.5 micron particles from a flowing airstream;
- a second, prefilter layer of flame retardant synthetic organic resin capable of efficiently removing particles larger than 10 microns from said flowing air stream, disposed on a first side of said first layer;
- and
- a backing layer of flame retardant, non-woven, synthetic organic resin having good tear resistance disposed on a second side of said first layer.
Dependencies are inferred from the claim text.