Acoustically effective nonwoven material for vehicle liners
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United States of America Patent
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Issued Date -
Jun 15, 2006
app pub date -
Mar 30, 2004
filing date -
Mar 31, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An acoustically effective nonwoven for linings of motor vehicles comprises a porous fibrous skeleton made of coarse fibers (8). These coarse fibers (8) comprise in particular staple fibers or spun-bonded fibers. A continuously changing weight quota of melted-on microfibrous material (7) is foreseen in a front and/or rear surface region (4). This melted-on microfibrous material (7) clings to the coarse fibers (8) and bonds these in such a manner that the nonwoven has a predetermined airflow resistance and is stiffened at least in its surface region (4). The airflow resistance in the surface region (4) has a value of between 200-60000 Nsm.sup.-3, in particular between 800-35000 Nsm.sup.-3, preferably between 1000-20000 Nsm.sup.-3, and mainly about 1400 Nsm.sup.-3. The bending stiffness of this fibrous nonwoven has a value of between 0.005 and 10 Nm, and in particular a value of between 0.25 and 6.0 Nm.
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