Multi-ply woven article having acoustical elements between double plies

摘要: A multi-ply woven article has elements positioned within pockets formed by double plies of the to provide with desirable acoustical properties as well considerable strength and rigidity. The may comprise a generally parallel pair rib which extend between opposite faces in zig zag fashion form plurality intermediate portions, or parallel, spaced apart face forming each article, both. Some are filled having selected number holes appropriate size so pass sound waves therethrough at controlled rate, while still other non-acoustical impervious waves. By location is effectively provided chambers trap dissipate wave energy entering from outside article.