Patent ID: 6821237
Filing Date: 2004-11-23
Classification: D21F,D21G,Y10T

Abstract:
A thermoroll for a paper/board machine or a finishing machine, comprising:a shell of metallic, ceramic or composite material, the shell incorporating ducts for passing a heating medium from one axial end of the shell to its opposite end; wherein the shell is made by means of one of casting powder metallurgical methods or combinations thereof, and that the ducts are formed in the shell directly in connection with manufacture of said shell, the shell is being formed as a composite construction in which there are at least two different material layers in the direction of thickness of the shell, the thermal conductivity of the material layers increasing when moving from the layer on the inner surface side of the shell to the layer on the outer surface side of the shell; and wherein the ducts are situated on at least two different radial levels in the shell material.