The present invention relates an acoustical insulation material for sound attenuation
containing a nonwoven web. Surprisingly, it has been discovered that an acoustical
insulation material made from a nonwoven web of thermoplastic fibers having an
average fiber diameter of less than about 7 microns, wherein the acoustical insulation
has a thickness less than about 3 mm and a density of greater than about 50 kg/m3
is effective as a sound insulation material. The acoustical insulation is
very effective as an acoustical insulation material, despite the low thickness
and high density of the acoustical insulation. A method of attenuating sound waves
passing from a sound source area to a second area using the acoustical insulation
material is also disclosed.
