Sound attenuating material for use within vehicles and methods of making same
作者： Thimothy J Allison , Carroll Owenby
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摘要: Sound attenuating composite articles and methods of making same are provided. article includes first (12), second (14) and/or third (16) fourth (18) layers material. The layer (12) material may be either an acoustic fiber batting foam elastic or inelastic is a thermoplastic that fused to surface the woven non-woven mixture fibers, such as scrim material, attached Selected portions (20) sound heated then compressed referred 'tuned' so have impedance greater than adjacent portions.
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