초록 ▼

A laminated noise attenuation panel for both sound absorption and sound transmission loss having as its principal layers an expanded thermoplastic core with alternately inverted cavities, half opening to each side of said core and a sheet of cured resinous material having hollow microspheres with su

A laminated noise attenuation panel for both sound absorption and sound transmission loss having as its principal layers an expanded thermoplastic core with alternately inverted cavities, half opening to each side of said core and a sheet of cured resinous material having hollow microspheres with substantially reduced atmospheric pressure randomly dispersed in said resinous material, said cured resinous sheet facing away from the noise source. The cavities of said core panel facing away from said noise source may be filled with cellulose. The side of said core panel toward the noise source may include a laminated layer of a perforated material and a decorative layer. The side of said panel away from the noise source may also include a layer of other materials and a decorative layer. Data for the noise attenuation properties of various combinations of laminations are presented.

대표청구항 ▼

A laminated noise attenuation panel comprising: an expanded core thermoplastic panel having alternately inverted cavities approximately one-half of which open to each side of said panel; and a panel of a noise attenuation material secured to said expanded core panel comprising randomly dispersed hol

A laminated noise attenuation panel comprising: an expanded core thermoplastic panel having alternately inverted cavities approximately one-half of which open to each side of said panel; and a panel of a noise attenuation material secured to said expanded core panel comprising randomly dispersed hollow microspheres having an interior pressure of one-third atmospheres or less in a cured low-viscosity adhesive binder material having an elastic inter-molecular structure yielding elastic wave attenuating properties.