Hollow panel with sound absorbing filling - has lid and perforated side of strength matching contents formed by waste material

摘要

The sound absorbing hollow member (10) with an open top fitted with a cover (11), has perforations in one side (12) and is filled with a loose material (13) which leaves cavities (14) located irregularly inside. The material can be waste material from a manufacturing process and can be gravel, ballast, cement broken tiles etc. Where other material is used, it is protected from the weather or condensation. The perforated side can be of metal or a fabric or net can be used for lighter material. USE/ADVANTAGE - The sound absorbing member can be universally used and is cheap and easily handled.