Ultra-light sound insulator
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United States of America Patent
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Jul 21, 2015
Grant Date -
May 8, 2014
app pub date -
Jan 9, 2014
filing date -
Mar 26, 2003
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Abstract
A sound insulator of the invention includes a sound absorption layer and an air-impermeable resonance layer, which are bonded to each other via an adhesive layer. The sound absorption layer has a thickness in a range of 5 to 50 mm, an area-weight of not greater than 2000 g/m2 and a two-layer structure of a high-density sound absorption layer and a low-density sound absorption layer. The high-density sound absorption layer is bonded to the air-impermeable resonance layer via the adhesive layer and has a density in a range of 0.05 to 0.20 g/cm3 and a thickness in a range of 2 to 30 mm. The low-density sound absorption layer is bonded to the other face of the high-density sound absorption layer via an adhesive layer and has a density in a range of 0.01 to 0.10 g/cm3 and a thickness in a range of 2 to 30 mm.
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