Apparatus for aerodynamically forming a fibrous sheet material

An apparatus for making sheets of fibrous material comparising:

• a forming chamber having perforated inner walls on top and on two opposite sides and solid outer walls spaced from said inner walls and defining a space therebetween for receiving a gas under pressure, means for supplying said gas under pressure into said space for entry into said chamber through the perforations in the inner walls to maintain the fibers from contacting said inner walls of said chamber during operation, a bottom wall of said forming chamber comprising an endless air-permeable travelling conveyor extending along the entire length thereof, means for feeding an air stream mixture with fibers into the interior of said forming chamber and flowed between said two opposite sides, means for applying an air suction through said conveyor to settle fibers thereon in the form of a sheet material, and a means for removing fibers from said chamber that have not settled on said conveyor.