Patent ID: 7480995

Claim:
A method for producing a corrugating roller for machines to produce corrugated cardboard, the method comprising: providing a single block of material; machining a pair of necks and a central axial cavity from said single block of material; drilling said single block of material at a first location to form a first longitudinal duct, said first longitudinal duct extending from one end of said single block of material to another end of said single block of material; drilling said single block of material at a second location of said single block to form a second longitudinal duct, said second longitudinal duct extending from said one end of said single block of material to said another end of said single block of material; repeating said machining step until said single block of material forms a hollow cylindrical body with an outer surface comprising a plurality of longitudinally extending corrugations, said longitudinal ducts forming a circuit for a heat-carrying fluid, wherein at least one of said pair of necks is supplied with said heat-carrying fluid, said central axial cavity extending within said hollow cylindrical body; machining said hollow cylindrical body to form a first radial duct located in area of one end of said first longitudinal duct and a second radial duct located in an area of another end of said first longitudinal duct; machining said hollow cylindrical body to form a third radial duct located in an area of one end of said second longitudinal duct and a fourth radial duct located in an area of another end of said second longitudinal duct; and closing one end of each of said radial ducts at an area adjacent to said corrugations and each end of each of said longitudinal ducts with a closing cap.