Cylindrical fibrous structures with graded pore size
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United States of America Patent
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-
Feb 23, 1988
Issued Date -
N/A
app pub date -
Mar 17, 1986
filing date -
Jan 6, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Cylindrical fibrous structures comprising a fibrous mass of nonwoven, synthetic, polymeric microfibers 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 volume over at least a substantial portion of the structure and, preferably, a graded fiber diameter structure, both as measured in the radial direction. The structures are particularly useful as depth filters.
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