초록 ▼

An acoustical panel structure having a honeycomb core, and thin, dense, sound transmitting glass fiber mat of uniform thickness adhered to each of the opposed major surfaces of the core. A glass fiber sheet of greater thickness than the mats is secured to the outer surface of one of the mats. A deco

An acoustical panel structure having a honeycomb core, and thin, dense, sound transmitting glass fiber mat of uniform thickness adhered to each of the opposed major surfaces of the core. A glass fiber sheet of greater thickness than the mats is secured to the outer surface of one of the mats. A decorative coating or layer is provided on the glass fiber sheet. The resulting structure has a noise reduction coefficient of upwards of 75, and a flame spread of less than 25.

대표청구항 ▼

An acoustical panel structure, consisting essentially of: a lightweight core member in the form of a honeycomb having wall portions defining a plurality of hollow, open-ended cells and opposed end cell planes; a pair of thin, dense, sound transmitting, substantially homogeneous, glass fiber mats of

An acoustical panel structure, consisting essentially of: a lightweight core member in the form of a honeycomb having wall portions defining a plurality of hollow, open-ended cells and opposed end cell planes; a pair of thin, dense, sound transmitting, substantially homogeneous, glass fiber mats of substantially uniform thickness and density secured in opposed, substantially parallel relation to one another to said core member along the said opposed end cell planes thereof; and a glass fiber sheet secured to the surface of at least one of said mats, said glass fiber sheet having a thickness greater than, and a density substantially equal to that of each of said glass fiber mats, said panel structure having a noise reduction coefficient of the order of about 75, and a flame spread of less than 25.