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Sound absorbing body, sound absorbing structural body, and method of manufacturing these bodies

  • US 20050252714A1
  • Filed: 04/25/2003
  • Published: 11/17/2005
  • Est. Priority Date: 04/26/2002
  • Status: Active Grant
First Claim
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1. A sound absorbing body comprising a molded body including two unexpanded layers and an expanded layer with a number of voids and held between these unexpanded layers, wherein a plurality of holes each of a depth that passes through one of the unexpanded layers and do not reach the other one of the unexpanded layers are formed at any positions of the molded body, and a cross-sectional area of the hole is in the range from 0.785 to 314 mm2 and the pitch is 1 mm or more.

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