Fiber-based flexible composite with dual-gradient structure for sound insulation

Sound insulation materials in the traditional sense are rigid, which are usually dense and bulky, while common porous materials have almost no sound insulation ability. Herein, a fiber-based flexible porous composite is presented as sound insulator fabricated via single-sided coating finishing on the one side of a nonwoven framework and has been demonstrated for high performance noise reduction. The enhanced acoustic insulation is identified to...