a method of forming flame - retardant nonwoven fabrics by hydroentanglement includes providing a precursor web . the precursor web is subjected to hydroentanglement on a three - dimensional image transfer device to create a patterned and imaged fabric . treatment with a flame - retardant binder enhances the integrity of the fabric , permitting the nonwoven to exhibit desired physical characteristics , including strength , durability , softness , and drapeability . the treated nonwoven may then be dyed by means applicable to conventional wovens .