Process for making a sheet of aramid fibers using a foamed medium
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United States of America Patent
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Jul 26, 2005
Grant Date -
Jul 29, 2004
app pub date -
Sep 9, 2003
filing date -
Sep 10, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method for forming a non-woven fibrous web comprised of aramid fibers and aramid fibrid which comprises forming a foam furnish by agitating the fibers and fibrid in a foamed medium, and passing the foam furnish onto a screen and defoaming the furnish. In effectively agitating the aramid fibers in the foamed medium, the agitating means is mounted for displacement within the foamed medium and includes a convex leading surface facing in the direction of displacement. The leading surface includes upper and lower portions converging in the direction of displacement to form a generally convex leading surface and driving means for displacing the agitating means in the direction of displacement for dispersing and mutually separating the aramid fibers within the foamed medium.
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