application may also be a pick up roll wherein there is a felt between the paper and the roll in accordance with the invention when it is desirable to obtain good adherence of the coating of the roll increased toughness and good wear resistance of the coating at the same time in the coating material it is possible to use a metal as an alloying agent the ratio being for example 1 to 10 30 metal to ceramic one example of a coating might be a surface layer of wc 86 to 20 cr4 isolated from the roll body by a layer of cr 2 o 3 to manufacture a roll coating it is possible to employ prior art processes e g powder metallurgic processes by means of the invention a number of advantages are obtained over the prior art it is thus possible in accordance with the invention to provide a wear resistant face and at the same time the detaching and other properties of the face can be modified very precisely in the desired way by means of the system of heating of the roll and by means of a suitable choice of materials thus the various objects of the invention are briefly detaching of paper from a roll by heating by acting upon viscosity or by vaporizing the interface heating of the paper and or modifying the surface properties of the paper by the heating for these applications short wave radiation is suitable the wavelength being e.