| 摘要 |
We claim an improved cartridge, typically in cylindrical or panel form that can be used in a dry or wet/dry vacuum cleaner. The cartridge is cleanable using a stream of service water, or by rapping on a solid object, or by using a compressed gas stream, but can provide exceptional filtering properties even for submicron particulate in the household or industrial environment. The cartridge has a combination of nanofiber filtration layer on a substrate. The nanofiber and substrate are engineered to obtain a maximum efficiency at reasonable pressure drop and permeability. The improved cartridge constitutes at least a substrate material and at least a layer comprising a non-woven, fine fiber separation layer. The nanofiber layer has a fiber diameter of about 0.05 to 0.5 micron, a nanofiber layer basis weight of about 3x10<-7 >to 6x10<-5 >gram-cm<-2>, an air permeability of about 1 to 1000 ft/min at 0.5 inch (water) DeltaP, and a pore size of about 0.01 to 100 microns. The substrate layer is preferably pleated, comprising a basis weight of about 0.2 oz-yd<-2 >to 350 lb-3000 ft<-2>, a thickness of about 0.001 to 0.2 inches, the overall filter having a permeability of about 1 to 200 ft-min<-1 >of 0.5 inch (water) DeltaP, an efficiency in removing a 0.76 micron particle at 10 ft-min<-1 >of about 10 to 99.99995%. The cartridge is configured to permit an air flow rate from about 5 to 600 cubic feet per minute. The nanofiber and substrate material are selected such that the cartridge can simply be rinsed in a service water stream, rapped on a solid object, or blown off with compressed gas to remove accumulated dust cake or particulate load.
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