Product and method of forming a gradient density fibrous filter
AssigneeAAF-McQuay Inc.
InventorKyung-Ju Choi
Life of this patent
Estimating the term…
Abstract
A filter media product and method of making the same wherein at least two filter media thicknesses of differing average coarse and fine fiber sizes are held in intertangled relationship forming a gradient density fibrous filter media with the fiber sizes having an overall average in successive thicknesses being either greater or less than the average fiber size of the intertangled fiber thickness(es).
Claims20
A pleatable multi layer gas filter media having at least dual layer gradient density comprising:
- a first layer composed of a first fiber blend having a first average fiber size and an amount of first single component fibers,
- a second layer composed of a second fiber blend having a second average fiber size and an amount of second single component fibers,
- said first average fiber size being greater than said second average fiber size,
- said first fiber blend having a portion larger than or equal to a largest single component fiber size of said amount of second single component fibers,
- said second fiber blend having a portion less than or equal to a smallest single component fiber size of said amount of first single component fibers;
- and,
- said first and second layers being compressed multi layer partially melted or fuse bonded;
- wherein each of said layers are individually carded to create said gradient density.
A gradient density air filter media comprising:
- a first layer of chopped fibers having a first average fiber size and a first quantity of single component fibers;
- a second layer of chopped fibers having a second average fiber size and a second quantity of single component fibers;
- said first average fiber size being greater than said second average fiber size;
- said first layer of chopped fibers having at least some fibers with a fiber size greater than or equal to a greatest fiber size of said second quantity of single component fibers;
- said second layer of chopped fibers having at least some fibers with a fiber size less than or equal to a smallest fiber size of said first quantity of single component fibers;
- and
- said first and second layers of chopped fibers each being individually carded and being overlaid with one another in intertangled relationship to create said gradient density;
- said media having improved efficiency of particulate removal and extended life.
A self supporting multi layer gas filter media having at least dual layer gradient density comprising:
- a first layer composed of a first fiber blend having a first average fiber size and an amount of first single component fibers;
- a second layer composed of a second fiber blend having a second average fiber size and an amount of second single component fibers;
- said first average fiber size being greater than said second average fiber size;
- said first fiber blend having a portion larger than or equal to a largest single component fiber size of said amount of second single component fibers;
- and
- said first and second layers being individually carded to create said gradient density and subsequently compressed to form multi layer partially melted or fuse bonded;
- said media having improved efficiency of particulate removal.
Dependencies are inferred from the claim text.