Method of making a rigidized fiber filter element
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United States of America Patent
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Mar 1, 1994
Grant Date -
N/A
app pub date -
Sep 25, 1992
filing date -
Sep 25, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rigidized fiber filter element is produced from a precursor fiber web. The precursor fiber web contains heat-shrinkable fibers or binder fibers or both. The web is exposed to temperatures sufficiently elevated to cause shrinkage of the fibers or melting of the binder. After cooling the web, the filter elements produced are self-supporting, and may have densities up to 500 kg/m.sup.3 to improve filtration while retaining good functional characteristics for operating pressure drop and air permeability. Rigidized fiber filter elements can be constructed of one material, and thus may be suitable for recycling.
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