Method and apparatus for producing fiberboard according to the dry method

Abstract From the Canadian patent

Method and apparatus for producing fiberboard and the like from fibrous sheeting material by the dry method in which the fibrous, sheeting material is advanced from a forming station while supported on a perforated endless belt to a pressing station where it is compressed to desired thickness and compactness. During the advancement of the sheeting material from the forming station to the pressing station, air is evacuated from the fibrous material by suction from beneath the endless belt while the sheeting is being simultaneously subjected to a preliminary compression without dis-, turbing the fiber orientation therein but sufficient to render the, sheeting material self-supporting during …