Laminated non-woven fabric filtering medium and method for producing same
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United States of America Patent
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Mar 11, 1997
Grant Date -
N/A
app pub date -
Sep 27, 1995
filing date -
Sep 27, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laminated non-woven fabric for filtering medium, which is composed of a plurality of non-woven fabric layers having different average pore sizes and laminated in the order of the average pore size, and a plurality of entangled regions interposed between any of adjacent two non-woven fabric layers which is formed by causing fibers of one of the adjacent two non-woven fabric layers to penetrate into the other layers to entangle the penetrated fibers with fibers of the other layers. The presence of the entangled regions provide a gradual change of the pore size from a non-woven fabric layer to another non-woven fabric layer to result in a good filtering efficiency and an elongated lifetime of a filter.
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