Composite fibrous filters
AssigneeEastman Chemical Company
InventorsShriram Bagrodia, Bobby M. Phillips, William A. Haile
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Abstract
Disclosed are novel composite fibrous structures which have utility as filters. These composite structures have at least two layers. The first layer is a nonwoven fibrous structure made from uniquely grooved fibers. The second layer is of a fibrous material that offers high filter efficiency.. The first layer has significantly lower pressure drop and higher dust holding capacity than the second layer.
Claims17
A filter for removing particulate matter from a fluid stream comprising a first layer of fibrous material and a second layer of fibrous material, said layers being in face-to-face contact,
- a) said first layer comprising fibers having a denier of about 3-15 and grooved in the longitudinal direction, said fibers having a cross-sectional shape factor of greater than 1.5 and a specific volume of about 1.5-5 cc/g, and
- b) said second layer comprising melt blown, thermally bonded fibers having a denier of about 0.1-1.0
- wherein the pressure drop across said second layer is much greater than the pressure drop across said first layer, the particle holding capacity of said first layer is much greater than the particle holding capacity of said second layer, and the filtration efficiency of said second layer is greater than the filtration efficiency of said first layer.
Dependencies are inferred from the claim text.