a sound - insulating curtain includes a sound - absorbing core formed by laminating porous sheets and films , is covered by covers , and sewn in an integrated manner . even after being integrally laminated , adjacently laminated layers are not excessively restrained in places other than sewn areas , and therefore displacement and deformation between layers caused by sound pressure can be tolerated . sound absorption effects are appropriately produced by each layer , which tolerates such displacement and deformation , while reliably maintaining integrity during handling . thus , the entire curtain maintains the ability to absorb sounds , efficiently attenuates noise that attempts to pass through the curtain , and suppresses the transmission of noise , thereby enabling noise to be reliably prevented from passing through the curtain .