High efficiency depth filter and methods of forming the same
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Aug 11, 1999
filing date -
Jul 8, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composite filter for removing particulates entrained in a gas has stack of at least two non-pre-bonded tiers of filter material which are bonded together to form a unitary stratified structure. The tiers can include thermally bindable components such as bicomponent or monocomponent polymer fibers, or adhesively bindable components, such as pulp fibers, especially fluff pulp, split film fibers, mixed electrostatically charged fibers and staple fibers. In addition to vacuum cleaner bags, the novel filter composite can be utilized in applications such as heating ventilation and air conditioning (HVAC) systems, vehicle cabin air filters, high efficiency (so-called 'HEPA') and clean room filters, emission control bag house filters, respirators, surgical face masks and the like.
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