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US 5,672,399 AGranted
Filter material construction and method
AssigneeDonaldson Company, Inc.
InventorsBrad Kahlbaugh, Denis J. Dudrey
Life of this patent
Estimating the term…
Abstract
A preferred filter media is provided. The media includes a fine fiber web secured to the surface of a coarse fiber support. A preferred filter media, comprising multiple layers of fine fiber media separated by coarse fiber support, is provided. Advantageous filter constructions result and are provided. Also according to the disclosure, methods for using such arrangements to filter are provided.
Claims20
An air filter construction comprising:
- (a) a pleated filter media arrangement comprising a multi-layer composite having a thickness of no greater than about 0.15 cm, a pleat depth of at least 0.6 cm, and including more than one pleat per 2.54 cm;
- said pleated media arrangement including first and second layers of fine fiber media therein:
- (i) said first layer of fine fiber media comprising a most upstream layer of fine fiber media positioned within said pleated media;
- said first layer of fine fiber media comprising media having an average fiber diameter of no greater than about 3 microns and said first layer comprising fibers with diameters no greater than about 5 microns;
- (ii) said first layer of fine fiber media having a thickness of no greater than 15 microns;
- (iii) said first layer of fine fiber media having a permeability, on its own, of at least about 90 meters/min.;
- and, an efficiency of no greater than about 30%, for 0.78 microns mono-dispersed polystyrene latex spheres;
- (iv) said second layer of fine fiber media being positioned downstream from said first layer of fine fiber media, said second layer of fine fiber media comprising media having an average fiber diameter of no greater than about 3 microns and said second layer comprising fibers with diameters no greater than about 5 microns;
- (v) said second layer of fine fiber media having a thickness of no greater than 15 microns;
- (vi) said second layer of fine fiber media having an efficiency of no greater than about 60%, for 0.78 micron mono-dispersed, polystyrene latex spheres;
- (vii) said second layer of fine fiber media having a greater efficiency for 0.78 micron mono-dispersed polystyrene latex spheres, than said first layer of fine fiber media;
- (viii) said second layer of fine fiber media being spaced from said first layer of fine fibers by a distance of no greater than 254 microns;
- (b) said pleated media arrangement including a first spacing structure comprising a region of coarse fiber material positioned to separate said first layer of fine fiber media from said second layer of fine fiber material;
- said first spacing structure comprising a material having an efficiency on its own of no greater than 10%, for 0.78 micron mono-dispersed polystyrene latex spheres;
- (i) said first spacing structure having a permeability of at least 200 meters/min.;
- (ii) said first spacing structure comprising a nonwoven substantially continuous fiber matrix having an average fiber diameter of at least 12 microns;
- (c) said pleated media arrangement including an upstream layer of coarse fiber material positioned adjacent an upstream side of said first layer of fine fiber media;
- said upstream layer of coarse fiber material comprising a nonwoven substantially continuous fiber matrix having an average fiber diameter of at least 12 microns;
- (i) said upstream layer of coarse fiber material having an efficiency, on its own, of no greater than 10%, for 0.78 micron mono-dispersed polystyrene latex spheres;
- and,
- (d) said pleated media arrangement including a downstream layer of coarse fiber material positioned adjacent a downstream side of said second layer of fine fiber media;
- said downstream layer of coarse fiber material comprising a nonwoven substantially continuous fiber matrix having an average fiber diameter of at least 12 microns;
- (i) said downstream layer of coarse fiber material having an efficiency, on its own, of no greater than 10%, for 0.78 micron mono-dispersed polystyrene latex spheres.
20 more elements
An air filter construction comprising:
- a pleated filter media arrangement comprising a multilayer composite having a thickness of no greater than about 0.15 cm, a pleat depth of at least 0.6 cm, and including more than one pleat per 2.54 cm;
- said pleated media arrangement including first, second and third layers of fine fiber media therein;
- (i) said first layer of fine fiber media comprising a most upstream layer of fine fiber media positioned within said pleated media;
- said first layer of fine fiber media comprising media having an average fiber diameter of no greater than about 3 microns and said first layer comprising fibers with diameters no greater than about 5 microns;
- (ii) said first layer of fine fiber media having a permeability, on its own, of at least about 90 meters/min.;
- and, an efficiency of about 10%, for 0.78 micron mono-dispersed polystyrene latex spheres;
- (iii) said second layer of fine fiber media being positioned downstream from said first layer of fine fiber media, said second layer of fine fiber media comprising media having an average fiber diameter of no greater than about 3 microns and said second layer comprising fibers with diameters no greater than about 5 microns;
- (iv) said second layer of fine fiber media having an efficiency of about 20%, for 0.78 micron mono-dispersed, polystyrene latex spheres;
- (v) said third layer of fine fiber media being positioned downstream from said second layer of fine fiber media;
- said third layer of fine fiber media comprising media having an average fiber diameter of no greater than about 3 microns and said third layer comprising fibers with diameters no greater than about 5 microns;
- (vi) said third layer of fine fiber media having an efficiency of about 40%, for 0.78 micron mono-dispersed, polystyrene latex spheres;
- (b) said pleated media arrangement including a first spacing structure comprising a region of coarse fiber material positioned to separate said first layer of fine fiber material from said second layer of fine fiber material;
- said first spacing structure comprising a material having an efficiency, on its own, of no greater than 10%, for 0.78 micron mono-dispersed polystyrene latex spheres;
- (i) said first spacing structure having a permeability of at least 200 meters/min.;
- (ii) said first spacing structure comprising a nonwoven, substantially continuous, fiber matrix having an average fiber diameter of at least 12 microns;
- and,
- (c) said pleated media arrangement including a second spacing structure comprising a region of coarse fiber material positioned to separate said second layer of fine fiber material from said third layer of fine fiber material;
- said second spacing structure comprising a material having an efficiency, on its own, of no greater than 10%, for 0.78 micron mono-dispersed polystyrene latex spheres;
- (i) said second spacing structure having a permeability of at least 200 meters/min.;
- (ii) said second spacing structure comprising a nonwoven, substantially continuous, fiber matrix having an average fiber diameter of at least 12 microns.
17 more elements
Dependencies are inferred from the claim text.