Non-woven fibre fabric and method of making the fabric
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United States of America Patent
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-
May 4, 1999
Grant Date -
N/A
app pub date -
Apr 4, 1997
filing date -
Oct 6, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Non-woven fiber fabrics are described, suitable for use in self-supporting dust filter units having at least one passage (10) defined by wall portions (12) made from air permeable fiber fabric through which wall portions (12) air can pass a d be drawn off along the passage (10) but which prevent the passage therethrough of dust and/or other debris carried by the air. The non-woven fabrics are blends of high temperature resistant fibers. A preferred blend consists of 50% by weight polyimide fibers and 50% by weight aramid fibers, but may include glass fibers, polytetrafuoroethylene fibers, or others and may optionally include an amount of heat activated fibers having a relatively high melting point for example, polyphenylene sulphide fibers.
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