such fibers is minimized by the low frictional forces between the various paper components and the corrugating system components in the preferred process for producing corrugated paperboard the corrugating paper is supplied from roll 10 and is first heated and steam conditioned by conventional conditioning steam showers 14 and 15 the conditioned paper 9 is then fed over the tips of a first corrugating roll 16 a supply 45 of solid lubricant in a water suspension emulsion or solution is connected with valve 43 to mix with water supply 46 and provide a water spray carrying the solid lubricant at a predetermined concentration the water and the solid lubricant are sprayed through nozzles 41 and 42 onto heated corrugating rolls 17 and 16 respectively the water begins to form steam on the surface of the corrugating roll flutes and the steam is carried into the nip region 19 along with corrugating paper 9 the availability of steam exactly at the nip 19 acts to further condition the paper and conform the paper along the flute contours without fracture and malformation of the flutes thus formed as the corrugated paper 36 passes out of the nip 19 adhesive is applied to the crests and linerboard 31 is attached the solid lubricants perform a release function as the corrugated paperboard is removed from corrugating rolls 16 and 17 corrugated paper 36 releases smoothly and properly contacts adhesive applicator roll 20 to maintain a good bond with linerboard 31 and without deformation of the well formed flutes numerous variations and.