Melt-blown filter medium
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United States of America Patent
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Apr 25, 1989
Issued Date -
N/A
app pub date -
Sep 21, 1987
filing date -
Dec 31, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
HEPA or pre-HEPA filter media are made by forming a web of melt-blown polypropylene fibers. The melt-blown process is accomplished at a low through-put of about 1 pound per inch of die width per hour and at a high fluid flow rate of about 250 to 325 standard cubic feet per minute. The resulting web has fibers with an average diameter of about 5 microns and surface pores of less than 30 microns in size. By cold calendering the web with pressure of between 100 and 300 psi, further filter efficiency can be achieved. The resulting calendered web has surface pore sizes less than 20 microns.
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