SOUND ATTENUATING ARTICLES HAVING REBULKABLE NONWOVEN WEBS AND METHODS OF FORMING SAME
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United States of America Patent
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Issued Date -
Jun 17, 2010
app pub date -
Dec 16, 2009
filing date -
Dec 16, 2008
priority date (Note) -
Abandoned
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Abstract
A method of forming a sound attenuating material includes heating a densified, rebulkable nonwoven web at a sufficient temperature and for a sufficient time to rebulk the nonwoven web to an open, lofty form; compressing the rebulked nonwoven web to a predetermined thickness; and cooling the compressed nonwoven web at a sufficient temperature and for a sufficient time to cause the compressed nonwoven web to maintain the predetermined thickness. The cooled, compressed nonwoven web may further be formed into a desired shape. One or more additional layers of material may be laminated to the densified, rebulkable nonwoven web substantially simultaneously with the heating step. The nonwoven web may be heated to a temperature above the melt point of at least one component fiber of the nonwoven web and heating may be accomplished by heating one or both sides of the nonwoven web.
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