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Abstract

Air filtration media is formed by collecting a layer of fine diameter glass fibers directly on a foraminous, reinforcing, backing layer and subsequently collecting a layer of relatively coarse diameter glass fibers directly on the layer of fine diameter glass fibers. A bonding agent carried by the glass fibers is then cured to bond the glass fibers within each layer together at their points of intersection, to bond the layers of fine and coarse glass fibers together and to bond the layer of fine diameter fibers to the backing layer. This method of forming the composite air filtration media permits the particle efficiency and the dirt loading capacity of the composite air filtration media to be adjusted during the production of the media by adjusting the diameters of the glass fibers in one or both of the layers and/or by adjusting the density of one or both of the layers.

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First Claim