B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/586
B01D 27/00 (2006.01) B01D 39/16 (2006.01) D04H 1/00 (2006.01) D04H 1/56 (2006.01)
Patent
CA 1255863
Abstract: Cylindrical fibrous structures comprising a fibrous mass of nonwoven, synthetic, polymeric micro- fibers wherein the microfibers are substantially free of fiber-to-fiber bonding and secured to each other by mechanical entanglement or intertwining, the fiber structure having a substantially constant voids vol- ume over at least a substantial portion of the struc- ture and, preferably, a graded fiber diameter struc- ture, both as measured in the radial direction. The structures are particularly useful as depth filters. The method for preparing such fibrous struc- tures comprises the steps of: (a) extruding synthetic, polymeric material from a fiberizing die and attenuating the extruded polymeric material to form micro- fibers by the application of one or more gas streams directed toward a rotating man- drel and a forming roll in operative relation- ship with the mandrel; (b) cooling the synthetic, polymeric microfibers prior to their collection on the mandrel to a temperature below that at which they bond or fuse together, thereby substantially eliminating fiber-to-fiber bonding; and (c) collecting the cooled microfibers on the man- drel as a nonwoven, synthetic fibrous mass while applying a force on the exterior surface of the collected microfibers by the forming roll; wherein the process variables are controlled to form the cylindrical fiber structure with at least the major portion of the fibrous mass having a sub- stantially constant voids volume.
471536
Bradley Arthur
Brennan Timothy R.
Harwood Colin F.
Pall David B.
Marks & Clerk
Pall Corporation
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