Highly acoustical, wet-formed substrate

摘要

An acoustic fiber-based substrate composed primarily of insulation-type spun fibers or blends of such fibers and wheel spun fibers. The fibers are bound with a water dispersible latex binder, or starch in conjunction with cellulose fiber. The insulation type spun fibers can be first quality virgin, post-industrial waste-stream or post consumer waste stream fiber. The substrate is wet-formed from a very dilute aqueous dispersion of ingredients onto a mesh forming screen, as on a Fourdrinier paper machine. By virtue of the insulation-type spun fiber dimensions, morphology and orientation: very low density wet-mats can be formed from a sufficiently dilute suspension. The low density and highly porous substrate is highly absorbing, exhibiting noise reduction coefficients, NRC values of about 0.80 or greater.