Sound attenuating material for use within vehicles and methods of making same

  • US 20030066708A1
  • Filed: 10/05/2001
  • Published: 04/10/2003
  • Est. Priority Date: 10/05/2001
  • Status: Active Grant
First Claim
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1. A sound attenuating composite article, comprising:

  • a first layer of material, wherein the first layer of material is selected from the group consisting of acoustic fiber batting and acoustic foam;

    a second layer of thermoplastic material fused to a surface of the first layer of material; and

    a third layer of thermoplastic material fused to a surface of the second layer of thermoplastic material;

    wherein one or more selected portions of the composite article are compressed relative to adjacent portions so as to have an acoustic impedance that is greater than an acoustic impedance of portions adjacent the one or more selected portions.

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