Patent ID: 7337981

Claim:
A method of making an anti-vibration plate for a vibration damping system, comprising the steps of: a) providing a plate having a first major surface and an opposite second major surface, said plate comprising one or more layers comprising mineral fibres and a cured binder, and b) compressing an area of said opposite first and second major surfaces of said plate provided in step (a) to reduce the static and/or dynamic stiffness of the plate by at least 10% compared to a static and/or the dynamic stiffness of said plate prior to step (b), said plate provided in step a) comprising two of said layers comprising mineral fibers and cured binder, one of said layers defining a top layer and the other defining a bottom layer, said top layer defining said first major surface and said bottom layer defining said second major surface, said top layer and said bottom layers having different densities.