LAMINATED SOUND-ABSORBING MATERIAL

摘要

FIELD: manufacture of sound-absorbing materials for reduction of noise inside confined space; aviation and automobile industries. ^ SUBSTANCE: proposed laminated sound-insulating material includes layer made from non-woven needle-piercing material impregnated with binder and layer of cellular structure. Layer of non-woven material is made from organic or carbon fibers. Aqueous dispersion on base of vinylidene chloride copolymer is used as binder. Layer of cellular structure is made in form of honeycomb panel on base of glass or aramide fabric impregnated with phenol formaldehyde resin. Proposed sound-absorbing material has high sound absorption coefficient within frequency range from 250 to 2000 Hz. ^ EFFECT: increased sound absorption coefficient. ^ 5 cl, 2 tbl, 1 ex