Corrugating machine and corrugating roll design for the same

A corrugating roll design for a corrugating machine comprising a pair of parallel, spaced apart, corrugating rolls which rotate in opposite directions on their respective rotational axes, the rotational axes of the corrugating rolls being spaced apart a predetermined distance, and each or the corrugating rolls being formed along its outer peripheral surface with longitudinally extending teeth with tooth tips and tooth roots, a paper medium to be corrugated adapted to be fed into a nip formed by the teeth of the corrugating rolls inter-engaging, and begin to be deformed as it roves into an actual corrugating impression zone in the nip where full engagement of the teeth takes place, thereby providing corrugations in the paper medium, characterized by depressions provided in the tops of the tooth tips of at least one of the corrugating rolls and spaced apart a predetermined distance along the length of the roll, each of said depressions having a bottom surface which is located to establish a spacing, between the bottom surface of the depression and the tooth root of the other corrugating roll at said actual corrugation impression zone in the nip, said spacing being greater than the thickness of the medium.