초록

The invention relates to a sound damping material in the shape of foils or strips comprising open-pored foam material impregnated with different quantities of a viscoelastic compound, which is intended for application to attenuated structures, particularly automobile body panels.

대표청구항 ▼

A sound insulating material for application to structures to be acoustically insulated, which structures possess areas oscillating at differing frequencies and therefore present differing acoustic requirements, said insulating material consisting of a single, non-laminated layer of an open-pored foa

A sound insulating material for application to structures to be acoustically insulated, which structures possess areas oscillating at differing frequencies and therefore present differing acoustic requirements, said insulating material consisting of a single, non-laminated layer of an open-pored foam or a layer of open-pored foam having a coating of textile material laminated to one or both surfaces thereof, said layer of foam being impregnated prior to application to said structures with a viscoelastic material so that said viscoelastic material penetrates the pores of the foam, said impregnation being in a non-uniform manner across at least one surface of said foam such that the quantity of said viscoelastic material across said surface varies in accordance with said differing acoustic requirements of said structures, said non-uniform impregnation further being in a planned manner such that upon application to said structures, the areas of said foam containing the greater quantities of said viscoelastic material correspond to the areas of said structures requiring greater sound damping, said viscoelastic material impregnating compound having different chemical compositions in individual areas in and on the surface of said foam.