Production method for multilayer filter material and multilayer filter material
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United States of America Patent
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Mar 12, 2002
Issued Date -
N/A
app pub date -
Jun 1, 2000
filing date -
Oct 1, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a unitary multi-layer filtering material and a method for producing a multi-layer filtering material. The multi-layer filtering material comprises at least one filtering layer formed by a dry forming technique and comprises natural fibers and/or plastic fibers and a binder material and/or binder fibers. The multi-layer filtering material further comprises at least one strengthening layer formed by a dry forming technique and comprises natural fibers and/or plastic fibers and binder material and/or binder fibers. The strengthening layer is airlaid onto either side of the filtering layer. The fibers of the filtering and strengthening layers are heat bonded to form a unity.
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